CA1313788C - Transfer apparatus - Google Patents
Transfer apparatusInfo
- Publication number
- CA1313788C CA1313788C CA000594457A CA594457A CA1313788C CA 1313788 C CA1313788 C CA 1313788C CA 000594457 A CA000594457 A CA 000594457A CA 594457 A CA594457 A CA 594457A CA 1313788 C CA1313788 C CA 1313788C
- Authority
- CA
- Canada
- Prior art keywords
- web
- blanket
- roll
- felt
- backing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F2/00—Transferring webs from wet ends to press sections
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0063—Devices for threading a web tail through a paper-making machine
Abstract
ABSTRACT OF THE DISCLOSURE
A transfer apparatus is disclosed for transferring a web from a press nip to a dryer section. The apparatus includes a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip. A press blanket extends through the press nip such that the web is disposed between the blanket and the backing roll during passage of the web through the press nip. A backing drum is disposed downstream relative to the press nip such that the blanket and the web extend contiguously relative to each other from the press nip to the backing drum. A dryer felt cooperates with the backing drum such that the web is disposed between the blanket and the felt during passage of the blanket, web and felt around the backing drum and a transfer mechanism is disposed adjacent to the backing drum for transferring the web without an open draw from the blanket to the felt such that the web follows the felt through the dryer section.
A transfer apparatus is disclosed for transferring a web from a press nip to a dryer section. The apparatus includes a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip. A press blanket extends through the press nip such that the web is disposed between the blanket and the backing roll during passage of the web through the press nip. A backing drum is disposed downstream relative to the press nip such that the blanket and the web extend contiguously relative to each other from the press nip to the backing drum. A dryer felt cooperates with the backing drum such that the web is disposed between the blanket and the felt during passage of the blanket, web and felt around the backing drum and a transfer mechanism is disposed adjacent to the backing drum for transferring the web without an open draw from the blanket to the felt such that the web follows the felt through the dryer section.
Description
A TRANSFER APPARATUS 13 ~ 3 ~ ~ ~
FIELD OF THE INVENTION
This invention relates to a transfer apparatus for transferring a web from a press nip to a dryer section.
More particularly, this invention relates to a transfer apparatus for transferring a web without an open draw from a press blanket to a dryer section.
INFORMATION DISCLOSURE STATEMENT
The transfer of a wet web ~rom a press section to a dryer section has become a critical area in the production of lightweight grades of paper, particularly when such paper is manufactured at high speeds.
-~ Typically, the web is transferrea from the press section to the dryer section in an "open drawn. The term ~open draw~ according to the present invention means the sheet is left unsupported for a finite length between the press section and the dryer section. During movement of the web through such ~open draw", the unsupported length of the web stretches and bags and the loose web may then flutter, wrinkle or bubble on the dryer felt.
In order to minimize these problems, the ~draw~ is increased. The "draw~ is defined as the difference ~etween the velocity of the web through the press section and through the dryer section respectively. Such difference in velocity stretches and tightens the web but also increases the web's susceptibility to tension breaks.
f '~
1313~ ~8 ` ~
The ~draw~ also sometimes produces an undesirable change in directionality of the web properties and may produce a reduction in the width of the resultant sheet.
The present invention seeks to overcome the aforemen-tioned problems by the elimination of such "open drawn.
In the past, several arrangements have been proposed in order to eliminate any "open draw", but each of these arrangements has introduced serious disadvantages.
For example, in one prior arrangement, the last press nip is double-felted and ~he wet web is permitted to remain in contact with one of the press felts until the web is transferred to the dryer felt at a drawless trans-fer point. Although this arrangement avoids the problems associated with an "open draw", it permits water in the press felt to be reabsorbed by the paper while the paper web is in contact with the press felt thereby increasing the moisture level of the web.
Another prior proposal is described in the brochure entitled "Fourth Valmet Papermachine Days~. In this particular arrangement, a special transfer felt runs through a press nip and then into the dryer section so that no open draw is required. However, this arrangement requires a felt that can withstand the nip load and which will not release water to the sheet and which will also allow an easy transfer of the web to the dryer felt.
Unfortunately, to-date, no such felt has been successfully designed and manufactured.
Another prior proposal is disclosed in U.S. patent 4,483,7~5 to Wicks, assigned to Beloit Corporation. Wicks teaches the use of an impervious belt which transfers the web from the press to the dryer section without an open draw as shown in figures 2,3 and 4 of that patent. In figure 2 of the Wicks patent, the web must transfer from the smooth belt surface to the felt surface which is of rough texture. Such trans er is not efficient because the web has a natural tendency to follow the smooth surface.
There is no provision in the Wicks disclosure of an auxiliary device to cause the transfer from the belt to the dryer section. In figure 3 of the Wicks patent, a vacuum roll is used to help the transfer, however, this roll must be pivoted and the contact point requires depression of the dryer felt into the porous belt. Figure 4 of the Wicks patent does not require a vacuum roll at the transfer point, but since the sheet is sandwiched between the press belt and the lead-in roll, and both the belt and the lead-in roll have smooth surfaces, the web may unpredictably follow either surface.
The present invention overcomes the aforementioned problems of the prior proposals by providing a more positive method of transferring the web. Such positive transfer is provided by extending the press belt or blanket over a backing drum which may be a ~baby dryer~ or a ~lead-in dryer" or an unheated roll. The aforementioned backing drum is wrapped by the dryer felt so that the web is sandwiched between the press belt and the dryer felt.
1 3 `1 '~
In the aforementioned arrangement, the web can pass from the press section to the dryer section without an open draw. Furthermore, because the web remains in contact with the smooth surface of the belt, the web will quickly separate from the press felt and will be subject to minimal rewetting. The web which remains with the press belt can be doctored from the belt with a conventional doctor blade. When the web has been established at the doctor blade, the web can be transferred to the dryer felt by any of the following met~ods:
l. A tail can be blown off of the belt into ropes which carry the tail through the dryer section.
FIELD OF THE INVENTION
This invention relates to a transfer apparatus for transferring a web from a press nip to a dryer section.
More particularly, this invention relates to a transfer apparatus for transferring a web without an open draw from a press blanket to a dryer section.
INFORMATION DISCLOSURE STATEMENT
The transfer of a wet web ~rom a press section to a dryer section has become a critical area in the production of lightweight grades of paper, particularly when such paper is manufactured at high speeds.
-~ Typically, the web is transferrea from the press section to the dryer section in an "open drawn. The term ~open draw~ according to the present invention means the sheet is left unsupported for a finite length between the press section and the dryer section. During movement of the web through such ~open draw", the unsupported length of the web stretches and bags and the loose web may then flutter, wrinkle or bubble on the dryer felt.
In order to minimize these problems, the ~draw~ is increased. The "draw~ is defined as the difference ~etween the velocity of the web through the press section and through the dryer section respectively. Such difference in velocity stretches and tightens the web but also increases the web's susceptibility to tension breaks.
f '~
1313~ ~8 ` ~
The ~draw~ also sometimes produces an undesirable change in directionality of the web properties and may produce a reduction in the width of the resultant sheet.
The present invention seeks to overcome the aforemen-tioned problems by the elimination of such "open drawn.
In the past, several arrangements have been proposed in order to eliminate any "open draw", but each of these arrangements has introduced serious disadvantages.
For example, in one prior arrangement, the last press nip is double-felted and ~he wet web is permitted to remain in contact with one of the press felts until the web is transferred to the dryer felt at a drawless trans-fer point. Although this arrangement avoids the problems associated with an "open draw", it permits water in the press felt to be reabsorbed by the paper while the paper web is in contact with the press felt thereby increasing the moisture level of the web.
Another prior proposal is described in the brochure entitled "Fourth Valmet Papermachine Days~. In this particular arrangement, a special transfer felt runs through a press nip and then into the dryer section so that no open draw is required. However, this arrangement requires a felt that can withstand the nip load and which will not release water to the sheet and which will also allow an easy transfer of the web to the dryer felt.
Unfortunately, to-date, no such felt has been successfully designed and manufactured.
Another prior proposal is disclosed in U.S. patent 4,483,7~5 to Wicks, assigned to Beloit Corporation. Wicks teaches the use of an impervious belt which transfers the web from the press to the dryer section without an open draw as shown in figures 2,3 and 4 of that patent. In figure 2 of the Wicks patent, the web must transfer from the smooth belt surface to the felt surface which is of rough texture. Such trans er is not efficient because the web has a natural tendency to follow the smooth surface.
There is no provision in the Wicks disclosure of an auxiliary device to cause the transfer from the belt to the dryer section. In figure 3 of the Wicks patent, a vacuum roll is used to help the transfer, however, this roll must be pivoted and the contact point requires depression of the dryer felt into the porous belt. Figure 4 of the Wicks patent does not require a vacuum roll at the transfer point, but since the sheet is sandwiched between the press belt and the lead-in roll, and both the belt and the lead-in roll have smooth surfaces, the web may unpredictably follow either surface.
The present invention overcomes the aforementioned problems of the prior proposals by providing a more positive method of transferring the web. Such positive transfer is provided by extending the press belt or blanket over a backing drum which may be a ~baby dryer~ or a ~lead-in dryer" or an unheated roll. The aforementioned backing drum is wrapped by the dryer felt so that the web is sandwiched between the press belt and the dryer felt.
1 3 `1 '~
In the aforementioned arrangement, the web can pass from the press section to the dryer section without an open draw. Furthermore, because the web remains in contact with the smooth surface of the belt, the web will quickly separate from the press felt and will be subject to minimal rewetting. The web which remains with the press belt can be doctored from the belt with a conventional doctor blade. When the web has been established at the doctor blade, the web can be transferred to the dryer felt by any of the following met~ods:
l. A tail can be blown off of the belt into ropes which carry the tail through the dryer section.
2. The dryer felt may be backed with a small vacuum box, or roll, in order to hold the tail onto the felt. ~1ith the second arrangement, the provision of threading ropes is avoided.
3. A vacuum device may be used directly to pull the web from the press belt to the dryer felt at the outgoing area of the backing drum rather than using either threading ropes or air pipes.
Therefore, the primary object of the present in-vention is the provision of a transfer apparatus which overcomes the aforementioned inadequacies of the prior art proposals and which provides a significant and substantial contribution to the papermaking art.
Another object of the present invention is the provision of a transfer apparatus which includes a backing drum disposed downstream relative to a press nip and a 1~3~8 "
press blanket extending through the press nip around the backing drum. A dryer felt cooperates with the backing drum such that the web is disposed between the blanket and the felt so that rewetting of the web by a press felt is minimized.
Another object of the present invention is the provision of a transfer apparatus which includes transfer means disposed adjacent to ~e backing drum for trans-ferring the web from the blanket to the dryer felt such that the web follows the dryer felt through the dryer section.
Another object of the present invention is the provision of a transfer apparatus in which the transfer means is a vacuum transfer roll disposed downstream relative to a backing drum such that the web is disposed between the blanket and the dryer felt from the backing drum to the vacuum transfer roll so that the web follows the dryer felt when the felt diverges relative to the blanket downstream relative to the vacuum transfer roll.
Another object of the present invention is the provision of a transfer apparatus in which the transfer means is a vacuum box which is disposed downstream rela-tive to the backing drum with the vacuum box being disposed adjacent to a joint run of the dryer felt and the web such that the dryer felt is disposed between the web and the vacuum box.
Another object of the present invention is the provision of a transfer apparatus in which the transfer means includes a vacuum bo~ which is disposed radially relative to the backing drum such that when the vacuum box is connected to a source of partial vacuum, air flows through the vacuum box adjacent to the backing drum for-drawing the web into close conformity with the dryer felt as the dryer felt diverges relative to the blanket thereby transferring the web to the dr~er felt.
Another object of the present invention is the provision of a transfer apparatus which includes an adjustable guide roll disposed downstream relative to the backing drum for guiding the blanket. The guide roll is movable towards and away from the dryer felt so that when the guide roll is disposed towards the dryer felt, the web is initially transferred from the blanket to the dryer ., felt. When the guide roll is disposed in a second position thereof away from the vacuum roll, the web continues to run contiguously with the dryer felt from the backing drum to the vacuum roll.
Another object of the present invention is the provision of a transfer apparatus in which the transfer means includes a vacuum roll having a rotatable shell defining a plurality of air flow passages. A vacuum chamber is disposed adjacent to the dryer felt so the air flows through the passages into the vacuum chamber for drawing the web into close conformity with the dryer felt.
- A pressure chamber is disposed diametrically opposite to the vacuum chamber such that air flows from the vacuum 13 1 ~
chamber through the passages outwardly away from the vacuum roll for cleaning the passages.
Another object of the present invention is the provision of a method of transferring a web from a press nip to a dryer section in which vacuum is applied to the dryer felt downstream relative to the backing drum such that when the dryer felt diverges relative to the blanket downstream relative to the backing drum, the web follows the dryer felt through the dryeL section.
Other objects and advantages of the present invention will be apparent to those skilled in the art by a con-sideration of the detailed description contained here-inafter taken in conjunction with the annexed drawings.
SUMMARY OF TI~E INVENTION
The present invention relates to a transfer apparatus and method for transferring a web from a press nip to a dryer section. The apparatus includes a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip. A press blanket extends through the press nip such that the web is disposed between the blanket and the backing roll during passage of the web through the press nip. A backing drum is disposed downstream relative to the press nip such that the blanket and the web extend contiguously relative to each other from the press nip to the backing drum. A
dryer felt cooperates with the backing drum such that the web is disposed between the blanket and the felt during passage of the blanket, web and felt around the backing drum. A teansfer means is disposed adjacent to the backing drum for transferring the web without open draw from the blanket to the felt such that the web follows the felt through the dryer section.
More specifically, the backing roll is vented and in a preferred embodiment of the present invention, the backing roll defines a plurality of grooves such that the water removed from the web during passage of the web through the press nip flows through the grooves for venting the press nip.
In one embodiment of the present invention, the press member is a press shoe which defines a concave surface for cooperating with the backing roll for defining there-between an extended nip.
In another embodiment of the present invention, the press member is a press roll.
In some of the embodiments of the present invention, the press blanket is an impervious belt which defines a smooth surface towards the web and the dryer felt extends around a portion of the circumference of the backing drum such that the felt, the web and the blanket together wrap around the aforementioned portion of the circumference of the backing drum with the blanket and the web being disposed between the backing drum and the felt.
In another embodiment of the present invention, the transfer means includes a vacuum transfer roll which is disposed downstream relative to the backing drum such that the web is disposed between the blanket and the felt from 1~3~3~ "
the backing drum to the vacuum transfer roll so that the web follows the felt without open draw when the felt diverges relative to the blanket downstream relative to the vacuum transfer roll.
In another embodiment of the present invention, the transfer means includes a vacuum box which is disposed downstream relative to the backing drum with the vacuum box being disposed adjacent to a joint run of the dryer felt and the web such that the dryer felt is disposed between the web and the vacuum box.
In another embodimen~ of the present invention, the transfer means includes a vacuum box which is disposed radially relative to the backing drum such that when the vacuum box is connected to a source of partial vacuum, air flows through the vacuum box adjacent to the backing drum for drawing the web into close conformity with the dryer felt as the dryer felt diverges relative to the blanket, thereby transferring the web to the dryer felt.
In another embodiment of the present invention, the transfer apparatus includes a dryer drum disposed down-stream relative to the transfer means such that the dryer felt and the web extend contiguously relative to each other from the backing drum to the dryer drum.
In another embodiment of the present invention, the transfer apparatus further includes a grooved roll which is disposed downstream relative to the backing drum such that the dryer felt and the blanket extend contiguously 1313~8 relative to each other from the backing drum to the grooved roll.
In another embodiment of the present invention, the transfer apparatus further includes an adjustable guide roll which is disposed downstream relative to the backing drum for guiding the blanket, the guide roll being movable towards, and away from, the dryer felt. Also, the trans-fer means includes a vacuum roll which is disposed down-stream relative to the backing drum such that the dryer felt and the web e~tend contiguously from the backing drum to the vacuum roll so that in a first position of the guide roll, the guide roll is disposed towards the vacuum roll so that the blanket, the web and the dryer felt extend contiguously from the backing drum to the vacuum roll for initially transferring the web from the blanket to the dryer felt. When the guide roll is disposed in a second position thereof, away from the vacuum roll, the web continues to run contiguously with, and be supported by, the dryer felt from the backing drum to the vacuum roll.
In a further embodiment of the present invention, the vacuum roll also includes a rotatable shell which defines a plurality of air flow passages. A vacuum chamber is disposed adjacent to the dryer felt such that in use of the apparatus, air flows through the passages into the vacuum chamber for drawing the web into close conformity with the dryer felt. Also, a pressure chamber is defined by the vacuum roll and is disposed diametrically opposite 1~13~'j'8 to the vacuum chamber such that air flows from the pressure chamber through the passages outwardly away from the vacuum roll for cleaning the passages.
In a further embodiment of the present invention, the transfer apparatus includes a doctor blade which is disposed downstream relative to the backing drum for doctoring the web from the blanket.
In another embodiment of the present invention, the transfer apparatus includes a backing roll and a press member cooperating with the backing roll for defining therebetween the press nip. A press blanket extends through the press nip such that the web is disposed between the blanket and the backing roll during passage of the web through the press nip. A dryer felt cooperates with the press member downstream relative to the press nip such that the web is disposed between the blanket and the felt downstream relative to the press nip. Transfer means are disposed downstream relative to the press nip and adjacent to the press member for transferring the web without open draw from the blanket to the felt such the web follows the felt through the dryer section.
In yet another embodiment of the present invention, the transfer means includes a suction roll disposed downstream relative to the backing drum such that in a first inoperative position of the suction roll the suction roll is disposed away from the blanket such that the web follows in close conformity with the blanket and does not transfer to the dryer felt. Whereas in a second position V ~
of the suction roll with the suction roll moved towards the blanket, the blanket, web and dryer felt move in close conformity with each other from the backing drum to the suction roll and thereafter the web transfers to the dryer felt downstream relative to the suction roll.
The present invention also includes a method for transferring a web from a press nip to a dryer section.
The method includes the steps of:
Pressing the web between a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip;
Transporting the pressed web supported by a press blanket from the press, nip towards, and around, a backing drum.
Sandwiching the web between the blanket and a dryer felt which extends around a portion of the circumference of the backing drum.
Applying a vacuum through the dryer felt downstream relative to backing drum such that the web follows the dryer felt without open draw through the dryer section.
Although the present invention is particularly described in the detailed description contained hereinafter, it will be appreciated by those skilled in the art that many variations and modifications of the present invention may be carried out without departing from the spirit and scope of the present invention as defined by the appended claims. Included among such modifications would be the provision of a grooved blanket instead of the smooth press blanket. Also, instead of using vacuum boxes or the like, the present invention envisages use of air nozzles or blow boxes in which air is blown through various nozzles to generate a Coanda effect for drawing the web into close conformity with the dryer felt.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a side-elevational view of a Tri-Vent press and a prior art transfer mechanism for transferring the pressed web with an open draw to a dryer section.
Figure 2 is a side-elevational view of a prior art transfer mechanism for transferring a web without open draw from a belt to a dryer section.
Figure 3 is a side-elevational view of a modification of the prior art invention shown in figure 2.
Figure 4 is a side-elevational view of yet a further modification of the transfer mechanism shown in the prior art invention of figure 2.
Figure 5 is a side-elevational view of the transfer apparatus according to a first embodiment of the present invention.
Figure 6 is a side-elevational view of a second embodiment of the present invention.
Figure 7 is a side-elevational view of a third embodiment of the present invention.
Figure 8 is a side-elevational view of a fourth embodiment of the present invention.
1 3 ~
Figure 9 is a side-elevational view of a fifth embodiment of the present invention.
Figure 10 is a side-elevational view of a sixth embodiment of the present invention.
Figure 11 is a side-elevational view of a seventh embodiment of the present invention.
Figure 12 is a side-elevational view of an eighth embodiment of the present invention.
Figure 13 is a side-elevational view of a ninth embodiment of the present invention.
Figure 14 is a side-elevational view of a tenth embodiment of the present invention showing a guide roll towards the dryer felt.
Figure 15 is a side-elevational view of the tenth embodiment of the present invention as shown in 14 but with the guide roll moved away from the dryer felt, and Figure 16 is an enlarged side-elevational view of an eleventh embodiment of the present invention;
Figure 17 is a side-elevational view of a twelfth embodiment of the present invention.
Figure 18 is a side-elevational view of a thirteenth embodiment to the present invention showing the suction roll in an inoperative position thereof; and Figure 19 is a side-elevational view of the embodiment shown in figure 18 but with the suction roll in the operative position thereof.
Similar reference characters refer to similar facts throughout the various embodiments of the present invention.
DETAILED DESCRIPTION OF THE DRAWINGS
Figure 1 is a side-elevational view of a prior art web transfer mechanism generally designated 10 for trans-ferring a web W from a Tri-Vent press section generally designated 12 to a dryer section generally designated 14.
A dryer felt 16 extends around a lead-in roll 18 disposed adjacent to a press roll 2~ such that the web W is trans-ferred through an open draw 22 from the press roll 20 to the lead-in roll 18.
Figure 2 is a side-elevational view of a prior art web transfer mechanism generally designated 10A disclosed in U.S. patent 4,483,745 issued November 20, 1984 to Wicks and assigned to Beloit Corporation. Figure 2 shows an extended nip Nl and a belt, or blanket 24, extending through the nip Nl such that the web WA adheres to, and is guided by, the belt 24 towards a lead-in roll 18A and a backing drum 26 so that the web WA is transferred from the belt 24 to the dryer section.
Figure 3 is a side-elevational view of a further embodiment of the aforementioned ~.S. patent 4,483,745 and shows an extended nip NlB and a belt 24B extending through the nip NlB and a dryer felt 16B being guided around an adjustable lead-in roll 18B so that the web WB is trans-ferred from the smooth surface 28 of the belt 24B to the dryer felt 16B.
1 3 ~ 8 Figure 4 is a side-elevational view of yet a further embodiment of the invention of U.S. patent 4,483,745 and shows an extended nip NlC and a smooth, impervious belt 24C extending therethrough for guiding a web WC towards a lead-in drum 18C such that the web WC is transferred from the belt 24C to the drum 18C without open draw. However, as the belt 24C has a smooth surface and the surface 30 of the drum 18C is also smooth, the web WC will not always predictably follow the smooth surface 30 of the drum 18C
for transferring the web ~C to the dryer felt 16C.
Figure 5 is a side-elevational view of a transfer apparatus generally designated lOD according to a first embodiment of the present invention for transferring a web WD from a press nip NlD to a dryer section generally designated 14D. The transfer apparatus lOD includes a backing roll 32 and a press member 34 which cooperates with the backing roll 32 for defining therebetween the press nip NlD. A press blanket 24D extends through the press nip NlD such that the web WD is disposed between the blanket 24D and the backing roll 32 during passage of the web WD through the press nip NlD. A backing drum 26D is disposed downstream relative to the press nip NlD such that the blanket 24D and the web WD extend contiguously relative to each other from the press nip NlD to the backing drum 26D. A dryer felt 16D cooperates with the backing drum 26D such that the web WD is disposed between the blanket 24D and the felt 16D during passage of the blanket 24D, web WD and felt 16D around the backing drum 2~D. A transfer means generally designated 36 is disposed adjacent to the backing drum 26D for transferring the web WD from the blanket 24D to the felt 16D such that the web WD follows the felt 16D through the dryer section 14D.
Figure 5 also shows the transfer apparatus as including a doctor blade 25 which is disposed downstream relative to the backing drum 26D for doctoring the web WD
from the blanket 24D.
~ n a second embodiment of ~he present invention as shown in figure 6, the backing roll 32E iS vented.
In a third embodiment of the present invention as shown in figure 7, the backing roll 32~ defines a plurality of grooves 38 such that water removed from the web WF during passage of the web WF through the press nip NlF flows through the grooves 38 for venting the press nip NlF.
In a fourth embodiment of the present invention as shown in figure 8, the press member 34G is a press shoe, defining a concave surface 4~ which cooperates with the backing roll 32G for defining therebetween an extended nip NlG.
In the first embodiment of the present invention as shown in figure 5, the press member 34 is a press roll.
In each of the embodiments shown in figures 5-8, the press blanket is an impervious belt which defines a smooth surface towards the web.
As shown in figures 5-8, the various transfer apparatus include a dryer felt which extends around a 1 3 1~
portion of the circumference of the backing drum such that the felt , the web and the blanket together wrap around the portion of the circumference of the backing drum with the blanket and the web being disposed between the backing drum and the felt.
Figure 9 shows a fifth embodiment of the present invention in which t~e transfer means generally designated 36H includes a vacuum transfer roll 42 disposed downstream relative to the backing drum 26H such that the web WH is disposed between the blanket 24H and the dryer felt 16H
from the backing drum 26H to the vacuum transfer roll 42 so that ~he web WH follows the felt 16H when the felt 16H
diverges relative to the blanket 24H downstream relative the vacuum transfer roll 42.
~igure 10 is a side-elevational view of a sixth embodiment of the present invention showing a transfer apparatus generally designated lOI wherein the transfer means generally designated 36I includes a vacuum box 44 disposed downstream relative to the backing drum 26I. The vacuum box 44 is disposed adjacent to a joint run of the dryer felt 16I and the web WI such that the dryer felt 16I
is disposed between the web WI and the vacuum box 44 with the web WI thereafter extending around a vented roll.
Figure 11 shows a seventh embodiment of the present invention in which the transfer means 36J includes a vacuum box 46 which is disposed radially relative to the backing drum 26J such that when the vacuum box 46 is connected to a source of partial vacuum 48, air flows 1~3~ g8 through the vacuum box 46 adjacent to the backing drum 26J
for drawing the web WJ into close conformity with the dryer felt 16J as the dryer felt 16J diverges relative to the blanket 24J thereby transferring the web WJ to the dryer felt 16J.
Figure 12 is an eighth embodiment of the present invention in which a d~yer drum 50 is disposed downstream relative to the transfer means 36K such that the dryer felt 16K and the web WK extend contiguously relative to each other from the backing drum 26K to the dryer drum 50.
As shown in figure 13 a ninth embodiment of the present invention includes a grooved roll 52 which is disposed downstream relative to the backing drum 26L such that the dryer felt 16L and the blanket 24L e~tend contig-uously relative to each other from the backing drum 26L
to the grooved roll 52.
Figures 14 and 15 show a tenth embodiment of the present invention in which an adjustable guide roll 54 is disposed downstream relative to the backing drum 26M for guiding the blanket 24M, the guide roll 54 being movable towards, and away from, the dryer felt 16M. Figure 14 shows the guide roll 54 disposed in a first position with the guide roll 54 moved towards a vacuum roll 42M. Figure 15 shows the guide roll 54 moved away from the vacuum roll 42M.
More particularly, as shown in figures 14 and 15, the transfer means generally designated 36M includes the vacuum roll 42M which is disposed downstream relative to 7 ~ ~
the backirlg drum 26M such that the dryer felt 16M and the web WM e~tend contiguously from the backing drum 26M to the vacuum roll 42M so that in a first position of the guide roll 54 as shown in figure 14, the guide roll 54 is moved towards the vacuum roll 42M so that the blanket 24M, the web ~M and the dryer felt 16M extend contiguously from the backing drum 26M to the vacuum roll 42M for initially transferring the web WM from the blanket 24M to the dryer felt 16M. ~hen the guide roll 54 is disposed in a second position thereof, as shown in figure 15, away from the vacuum roll 42M, the web ~M continues to run contiguously with, and supported by, the dryer felt 16M from the backing drum 26M to the vacuum roll 42M.
Figure 16 is an enlarged side-elevational view of an eleventh embodiment of the present invention in which a vacuum roll 42N also includes a rotatable shell 56 defining a plurality of air flow passages 57,58,59. A
vacuum chamber 60 is disposed adjacent to the dryer felt 16N such that in use of the apparatus, air indicated by the arrow 62 flows through the passages 57 to 59 into the vacuum chamber 60 for drawing the web WN into close conformity with the dryer felt 16N. A pressure chamber 64 is defined by the vacuum roll 42N and is disposed diamet-rically opposite to the vacuum chamber 60 such that air flows from the pressure chamber 64 as shown by the arrows 66 through the passages 57 to 59 outwardly away from the vacuum roll 42N for cleaning the passages 57 to 59 as the shell 56 rotates.
Figure 17 is a side-elevational view of a twèlfth embodiment to the present invention showing a press nip NlO defined by a backing roll 320 and a press member 340.
The web W0 separates from the press felt and continues in close conormity with the press member 340 and a doctor 250 removes the web W0 from the blanket 240. A dryer felt 160 cooperates with the press member 3~0 downstream relative to the press nip NlO for defining a transfer means generally designated 360. More speciically, the transfer means 360 includes a vacuum box 440 for transferring the web W0 from the blanket 240 to the dryer felt 160 such that the press member 340 serves the dual purpose of a press member and a backing drum.
~ igure 18 is a side-elevational vi.ew of a thirteenth embodiment to the present invention and shows a backing drum 26P with the blanket 24P and the web WP running in close conformity with the blanket 24P from the backi.ng drum 26P to the roll 54P. A movable suction roll 42P is disposed downstream relative to the backing drum 26P with the dryer felt 16P disposed between the suction roll 42P
and the web WP. As shown in figure 18, the suction roll 42P is disposed towards from the web WP such that the web WP follows the felt 16P and not the blanket 24P downstream relative to the backing drum 26P.
However, after the web has been transferred to the dryer section, the suction roll 42P is moved away the blanket 24P, as shown in figure 19. The web WP remains in contact with the dryer felt 16P and continues to extend to ~ 3 ~ 8 the dryer section. Due to the application of suction to the web WP by the suction roll 42P, the web WP continues to follow the dryer felt 16P downstream relative to the suction roll 42P so that the web WP is transferred to the dryer section by the transfer means generally designated 36P. Alternatively, when the web WP has been established on the press blanket 24P, the suction roll 42P can be moved to the position shown in figure 18 and the web WP
will be transferred to the dryer section.
In operation of all of the various embodiments shown in figures 5 - 16 and 18 and 19 of the present invention, the web is transferred without open draw from a press nip to a dryer section. The web is pressed between a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip. The pressed web supported by the press blanket is transported from the press nip towards, and around, the backing drum.
The web is sandwiched between the blanket and a dryer felt which extends around a portion of the circumference of the backing drum. Vacuum is applied through the dryer felt downstream relative to the backing drum such that when the dryer felt diverges relative to the blanket downstream relative to the backing drum~ the web follows the dryer felt through the dryer section.
In operation of the embodiment shown in Figure 17, the web W0 follows in close conformity with the blanket 240 around the press member 340 downstream relative to the nip N10 and is transferred for the blan~et 240 by the vacuum box 440 to the dryer felt 160.
The present invention provides a simple and efficient means for transferring a pressed web without open draw from a press section to a dryer section without rewetting the web by contact of the web with a press felt. More particularly,, the present invention provides a simple means for transferring the pressed web from the smooth surface of a pressing blanket such that the web is trans-ferred without open draw to, and thereafter follows, a dryer felt through the dryer section.
Therefore, the primary object of the present in-vention is the provision of a transfer apparatus which overcomes the aforementioned inadequacies of the prior art proposals and which provides a significant and substantial contribution to the papermaking art.
Another object of the present invention is the provision of a transfer apparatus which includes a backing drum disposed downstream relative to a press nip and a 1~3~8 "
press blanket extending through the press nip around the backing drum. A dryer felt cooperates with the backing drum such that the web is disposed between the blanket and the felt so that rewetting of the web by a press felt is minimized.
Another object of the present invention is the provision of a transfer apparatus which includes transfer means disposed adjacent to ~e backing drum for trans-ferring the web from the blanket to the dryer felt such that the web follows the dryer felt through the dryer section.
Another object of the present invention is the provision of a transfer apparatus in which the transfer means is a vacuum transfer roll disposed downstream relative to a backing drum such that the web is disposed between the blanket and the dryer felt from the backing drum to the vacuum transfer roll so that the web follows the dryer felt when the felt diverges relative to the blanket downstream relative to the vacuum transfer roll.
Another object of the present invention is the provision of a transfer apparatus in which the transfer means is a vacuum box which is disposed downstream rela-tive to the backing drum with the vacuum box being disposed adjacent to a joint run of the dryer felt and the web such that the dryer felt is disposed between the web and the vacuum box.
Another object of the present invention is the provision of a transfer apparatus in which the transfer means includes a vacuum bo~ which is disposed radially relative to the backing drum such that when the vacuum box is connected to a source of partial vacuum, air flows through the vacuum box adjacent to the backing drum for-drawing the web into close conformity with the dryer felt as the dryer felt diverges relative to the blanket thereby transferring the web to the dr~er felt.
Another object of the present invention is the provision of a transfer apparatus which includes an adjustable guide roll disposed downstream relative to the backing drum for guiding the blanket. The guide roll is movable towards and away from the dryer felt so that when the guide roll is disposed towards the dryer felt, the web is initially transferred from the blanket to the dryer ., felt. When the guide roll is disposed in a second position thereof away from the vacuum roll, the web continues to run contiguously with the dryer felt from the backing drum to the vacuum roll.
Another object of the present invention is the provision of a transfer apparatus in which the transfer means includes a vacuum roll having a rotatable shell defining a plurality of air flow passages. A vacuum chamber is disposed adjacent to the dryer felt so the air flows through the passages into the vacuum chamber for drawing the web into close conformity with the dryer felt.
- A pressure chamber is disposed diametrically opposite to the vacuum chamber such that air flows from the vacuum 13 1 ~
chamber through the passages outwardly away from the vacuum roll for cleaning the passages.
Another object of the present invention is the provision of a method of transferring a web from a press nip to a dryer section in which vacuum is applied to the dryer felt downstream relative to the backing drum such that when the dryer felt diverges relative to the blanket downstream relative to the backing drum, the web follows the dryer felt through the dryeL section.
Other objects and advantages of the present invention will be apparent to those skilled in the art by a con-sideration of the detailed description contained here-inafter taken in conjunction with the annexed drawings.
SUMMARY OF TI~E INVENTION
The present invention relates to a transfer apparatus and method for transferring a web from a press nip to a dryer section. The apparatus includes a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip. A press blanket extends through the press nip such that the web is disposed between the blanket and the backing roll during passage of the web through the press nip. A backing drum is disposed downstream relative to the press nip such that the blanket and the web extend contiguously relative to each other from the press nip to the backing drum. A
dryer felt cooperates with the backing drum such that the web is disposed between the blanket and the felt during passage of the blanket, web and felt around the backing drum. A teansfer means is disposed adjacent to the backing drum for transferring the web without open draw from the blanket to the felt such that the web follows the felt through the dryer section.
More specifically, the backing roll is vented and in a preferred embodiment of the present invention, the backing roll defines a plurality of grooves such that the water removed from the web during passage of the web through the press nip flows through the grooves for venting the press nip.
In one embodiment of the present invention, the press member is a press shoe which defines a concave surface for cooperating with the backing roll for defining there-between an extended nip.
In another embodiment of the present invention, the press member is a press roll.
In some of the embodiments of the present invention, the press blanket is an impervious belt which defines a smooth surface towards the web and the dryer felt extends around a portion of the circumference of the backing drum such that the felt, the web and the blanket together wrap around the aforementioned portion of the circumference of the backing drum with the blanket and the web being disposed between the backing drum and the felt.
In another embodiment of the present invention, the transfer means includes a vacuum transfer roll which is disposed downstream relative to the backing drum such that the web is disposed between the blanket and the felt from 1~3~3~ "
the backing drum to the vacuum transfer roll so that the web follows the felt without open draw when the felt diverges relative to the blanket downstream relative to the vacuum transfer roll.
In another embodiment of the present invention, the transfer means includes a vacuum box which is disposed downstream relative to the backing drum with the vacuum box being disposed adjacent to a joint run of the dryer felt and the web such that the dryer felt is disposed between the web and the vacuum box.
In another embodimen~ of the present invention, the transfer means includes a vacuum box which is disposed radially relative to the backing drum such that when the vacuum box is connected to a source of partial vacuum, air flows through the vacuum box adjacent to the backing drum for drawing the web into close conformity with the dryer felt as the dryer felt diverges relative to the blanket, thereby transferring the web to the dryer felt.
In another embodiment of the present invention, the transfer apparatus includes a dryer drum disposed down-stream relative to the transfer means such that the dryer felt and the web extend contiguously relative to each other from the backing drum to the dryer drum.
In another embodiment of the present invention, the transfer apparatus further includes a grooved roll which is disposed downstream relative to the backing drum such that the dryer felt and the blanket extend contiguously 1313~8 relative to each other from the backing drum to the grooved roll.
In another embodiment of the present invention, the transfer apparatus further includes an adjustable guide roll which is disposed downstream relative to the backing drum for guiding the blanket, the guide roll being movable towards, and away from, the dryer felt. Also, the trans-fer means includes a vacuum roll which is disposed down-stream relative to the backing drum such that the dryer felt and the web e~tend contiguously from the backing drum to the vacuum roll so that in a first position of the guide roll, the guide roll is disposed towards the vacuum roll so that the blanket, the web and the dryer felt extend contiguously from the backing drum to the vacuum roll for initially transferring the web from the blanket to the dryer felt. When the guide roll is disposed in a second position thereof, away from the vacuum roll, the web continues to run contiguously with, and be supported by, the dryer felt from the backing drum to the vacuum roll.
In a further embodiment of the present invention, the vacuum roll also includes a rotatable shell which defines a plurality of air flow passages. A vacuum chamber is disposed adjacent to the dryer felt such that in use of the apparatus, air flows through the passages into the vacuum chamber for drawing the web into close conformity with the dryer felt. Also, a pressure chamber is defined by the vacuum roll and is disposed diametrically opposite 1~13~'j'8 to the vacuum chamber such that air flows from the pressure chamber through the passages outwardly away from the vacuum roll for cleaning the passages.
In a further embodiment of the present invention, the transfer apparatus includes a doctor blade which is disposed downstream relative to the backing drum for doctoring the web from the blanket.
In another embodiment of the present invention, the transfer apparatus includes a backing roll and a press member cooperating with the backing roll for defining therebetween the press nip. A press blanket extends through the press nip such that the web is disposed between the blanket and the backing roll during passage of the web through the press nip. A dryer felt cooperates with the press member downstream relative to the press nip such that the web is disposed between the blanket and the felt downstream relative to the press nip. Transfer means are disposed downstream relative to the press nip and adjacent to the press member for transferring the web without open draw from the blanket to the felt such the web follows the felt through the dryer section.
In yet another embodiment of the present invention, the transfer means includes a suction roll disposed downstream relative to the backing drum such that in a first inoperative position of the suction roll the suction roll is disposed away from the blanket such that the web follows in close conformity with the blanket and does not transfer to the dryer felt. Whereas in a second position V ~
of the suction roll with the suction roll moved towards the blanket, the blanket, web and dryer felt move in close conformity with each other from the backing drum to the suction roll and thereafter the web transfers to the dryer felt downstream relative to the suction roll.
The present invention also includes a method for transferring a web from a press nip to a dryer section.
The method includes the steps of:
Pressing the web between a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip;
Transporting the pressed web supported by a press blanket from the press, nip towards, and around, a backing drum.
Sandwiching the web between the blanket and a dryer felt which extends around a portion of the circumference of the backing drum.
Applying a vacuum through the dryer felt downstream relative to backing drum such that the web follows the dryer felt without open draw through the dryer section.
Although the present invention is particularly described in the detailed description contained hereinafter, it will be appreciated by those skilled in the art that many variations and modifications of the present invention may be carried out without departing from the spirit and scope of the present invention as defined by the appended claims. Included among such modifications would be the provision of a grooved blanket instead of the smooth press blanket. Also, instead of using vacuum boxes or the like, the present invention envisages use of air nozzles or blow boxes in which air is blown through various nozzles to generate a Coanda effect for drawing the web into close conformity with the dryer felt.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a side-elevational view of a Tri-Vent press and a prior art transfer mechanism for transferring the pressed web with an open draw to a dryer section.
Figure 2 is a side-elevational view of a prior art transfer mechanism for transferring a web without open draw from a belt to a dryer section.
Figure 3 is a side-elevational view of a modification of the prior art invention shown in figure 2.
Figure 4 is a side-elevational view of yet a further modification of the transfer mechanism shown in the prior art invention of figure 2.
Figure 5 is a side-elevational view of the transfer apparatus according to a first embodiment of the present invention.
Figure 6 is a side-elevational view of a second embodiment of the present invention.
Figure 7 is a side-elevational view of a third embodiment of the present invention.
Figure 8 is a side-elevational view of a fourth embodiment of the present invention.
1 3 ~
Figure 9 is a side-elevational view of a fifth embodiment of the present invention.
Figure 10 is a side-elevational view of a sixth embodiment of the present invention.
Figure 11 is a side-elevational view of a seventh embodiment of the present invention.
Figure 12 is a side-elevational view of an eighth embodiment of the present invention.
Figure 13 is a side-elevational view of a ninth embodiment of the present invention.
Figure 14 is a side-elevational view of a tenth embodiment of the present invention showing a guide roll towards the dryer felt.
Figure 15 is a side-elevational view of the tenth embodiment of the present invention as shown in 14 but with the guide roll moved away from the dryer felt, and Figure 16 is an enlarged side-elevational view of an eleventh embodiment of the present invention;
Figure 17 is a side-elevational view of a twelfth embodiment of the present invention.
Figure 18 is a side-elevational view of a thirteenth embodiment to the present invention showing the suction roll in an inoperative position thereof; and Figure 19 is a side-elevational view of the embodiment shown in figure 18 but with the suction roll in the operative position thereof.
Similar reference characters refer to similar facts throughout the various embodiments of the present invention.
DETAILED DESCRIPTION OF THE DRAWINGS
Figure 1 is a side-elevational view of a prior art web transfer mechanism generally designated 10 for trans-ferring a web W from a Tri-Vent press section generally designated 12 to a dryer section generally designated 14.
A dryer felt 16 extends around a lead-in roll 18 disposed adjacent to a press roll 2~ such that the web W is trans-ferred through an open draw 22 from the press roll 20 to the lead-in roll 18.
Figure 2 is a side-elevational view of a prior art web transfer mechanism generally designated 10A disclosed in U.S. patent 4,483,745 issued November 20, 1984 to Wicks and assigned to Beloit Corporation. Figure 2 shows an extended nip Nl and a belt, or blanket 24, extending through the nip Nl such that the web WA adheres to, and is guided by, the belt 24 towards a lead-in roll 18A and a backing drum 26 so that the web WA is transferred from the belt 24 to the dryer section.
Figure 3 is a side-elevational view of a further embodiment of the aforementioned ~.S. patent 4,483,745 and shows an extended nip NlB and a belt 24B extending through the nip NlB and a dryer felt 16B being guided around an adjustable lead-in roll 18B so that the web WB is trans-ferred from the smooth surface 28 of the belt 24B to the dryer felt 16B.
1 3 ~ 8 Figure 4 is a side-elevational view of yet a further embodiment of the invention of U.S. patent 4,483,745 and shows an extended nip NlC and a smooth, impervious belt 24C extending therethrough for guiding a web WC towards a lead-in drum 18C such that the web WC is transferred from the belt 24C to the drum 18C without open draw. However, as the belt 24C has a smooth surface and the surface 30 of the drum 18C is also smooth, the web WC will not always predictably follow the smooth surface 30 of the drum 18C
for transferring the web ~C to the dryer felt 16C.
Figure 5 is a side-elevational view of a transfer apparatus generally designated lOD according to a first embodiment of the present invention for transferring a web WD from a press nip NlD to a dryer section generally designated 14D. The transfer apparatus lOD includes a backing roll 32 and a press member 34 which cooperates with the backing roll 32 for defining therebetween the press nip NlD. A press blanket 24D extends through the press nip NlD such that the web WD is disposed between the blanket 24D and the backing roll 32 during passage of the web WD through the press nip NlD. A backing drum 26D is disposed downstream relative to the press nip NlD such that the blanket 24D and the web WD extend contiguously relative to each other from the press nip NlD to the backing drum 26D. A dryer felt 16D cooperates with the backing drum 26D such that the web WD is disposed between the blanket 24D and the felt 16D during passage of the blanket 24D, web WD and felt 16D around the backing drum 2~D. A transfer means generally designated 36 is disposed adjacent to the backing drum 26D for transferring the web WD from the blanket 24D to the felt 16D such that the web WD follows the felt 16D through the dryer section 14D.
Figure 5 also shows the transfer apparatus as including a doctor blade 25 which is disposed downstream relative to the backing drum 26D for doctoring the web WD
from the blanket 24D.
~ n a second embodiment of ~he present invention as shown in figure 6, the backing roll 32E iS vented.
In a third embodiment of the present invention as shown in figure 7, the backing roll 32~ defines a plurality of grooves 38 such that water removed from the web WF during passage of the web WF through the press nip NlF flows through the grooves 38 for venting the press nip NlF.
In a fourth embodiment of the present invention as shown in figure 8, the press member 34G is a press shoe, defining a concave surface 4~ which cooperates with the backing roll 32G for defining therebetween an extended nip NlG.
In the first embodiment of the present invention as shown in figure 5, the press member 34 is a press roll.
In each of the embodiments shown in figures 5-8, the press blanket is an impervious belt which defines a smooth surface towards the web.
As shown in figures 5-8, the various transfer apparatus include a dryer felt which extends around a 1 3 1~
portion of the circumference of the backing drum such that the felt , the web and the blanket together wrap around the portion of the circumference of the backing drum with the blanket and the web being disposed between the backing drum and the felt.
Figure 9 shows a fifth embodiment of the present invention in which t~e transfer means generally designated 36H includes a vacuum transfer roll 42 disposed downstream relative to the backing drum 26H such that the web WH is disposed between the blanket 24H and the dryer felt 16H
from the backing drum 26H to the vacuum transfer roll 42 so that ~he web WH follows the felt 16H when the felt 16H
diverges relative to the blanket 24H downstream relative the vacuum transfer roll 42.
~igure 10 is a side-elevational view of a sixth embodiment of the present invention showing a transfer apparatus generally designated lOI wherein the transfer means generally designated 36I includes a vacuum box 44 disposed downstream relative to the backing drum 26I. The vacuum box 44 is disposed adjacent to a joint run of the dryer felt 16I and the web WI such that the dryer felt 16I
is disposed between the web WI and the vacuum box 44 with the web WI thereafter extending around a vented roll.
Figure 11 shows a seventh embodiment of the present invention in which the transfer means 36J includes a vacuum box 46 which is disposed radially relative to the backing drum 26J such that when the vacuum box 46 is connected to a source of partial vacuum 48, air flows 1~3~ g8 through the vacuum box 46 adjacent to the backing drum 26J
for drawing the web WJ into close conformity with the dryer felt 16J as the dryer felt 16J diverges relative to the blanket 24J thereby transferring the web WJ to the dryer felt 16J.
Figure 12 is an eighth embodiment of the present invention in which a d~yer drum 50 is disposed downstream relative to the transfer means 36K such that the dryer felt 16K and the web WK extend contiguously relative to each other from the backing drum 26K to the dryer drum 50.
As shown in figure 13 a ninth embodiment of the present invention includes a grooved roll 52 which is disposed downstream relative to the backing drum 26L such that the dryer felt 16L and the blanket 24L e~tend contig-uously relative to each other from the backing drum 26L
to the grooved roll 52.
Figures 14 and 15 show a tenth embodiment of the present invention in which an adjustable guide roll 54 is disposed downstream relative to the backing drum 26M for guiding the blanket 24M, the guide roll 54 being movable towards, and away from, the dryer felt 16M. Figure 14 shows the guide roll 54 disposed in a first position with the guide roll 54 moved towards a vacuum roll 42M. Figure 15 shows the guide roll 54 moved away from the vacuum roll 42M.
More particularly, as shown in figures 14 and 15, the transfer means generally designated 36M includes the vacuum roll 42M which is disposed downstream relative to 7 ~ ~
the backirlg drum 26M such that the dryer felt 16M and the web WM e~tend contiguously from the backing drum 26M to the vacuum roll 42M so that in a first position of the guide roll 54 as shown in figure 14, the guide roll 54 is moved towards the vacuum roll 42M so that the blanket 24M, the web ~M and the dryer felt 16M extend contiguously from the backing drum 26M to the vacuum roll 42M for initially transferring the web WM from the blanket 24M to the dryer felt 16M. ~hen the guide roll 54 is disposed in a second position thereof, as shown in figure 15, away from the vacuum roll 42M, the web ~M continues to run contiguously with, and supported by, the dryer felt 16M from the backing drum 26M to the vacuum roll 42M.
Figure 16 is an enlarged side-elevational view of an eleventh embodiment of the present invention in which a vacuum roll 42N also includes a rotatable shell 56 defining a plurality of air flow passages 57,58,59. A
vacuum chamber 60 is disposed adjacent to the dryer felt 16N such that in use of the apparatus, air indicated by the arrow 62 flows through the passages 57 to 59 into the vacuum chamber 60 for drawing the web WN into close conformity with the dryer felt 16N. A pressure chamber 64 is defined by the vacuum roll 42N and is disposed diamet-rically opposite to the vacuum chamber 60 such that air flows from the pressure chamber 64 as shown by the arrows 66 through the passages 57 to 59 outwardly away from the vacuum roll 42N for cleaning the passages 57 to 59 as the shell 56 rotates.
Figure 17 is a side-elevational view of a twèlfth embodiment to the present invention showing a press nip NlO defined by a backing roll 320 and a press member 340.
The web W0 separates from the press felt and continues in close conormity with the press member 340 and a doctor 250 removes the web W0 from the blanket 240. A dryer felt 160 cooperates with the press member 3~0 downstream relative to the press nip NlO for defining a transfer means generally designated 360. More speciically, the transfer means 360 includes a vacuum box 440 for transferring the web W0 from the blanket 240 to the dryer felt 160 such that the press member 340 serves the dual purpose of a press member and a backing drum.
~ igure 18 is a side-elevational vi.ew of a thirteenth embodiment to the present invention and shows a backing drum 26P with the blanket 24P and the web WP running in close conformity with the blanket 24P from the backi.ng drum 26P to the roll 54P. A movable suction roll 42P is disposed downstream relative to the backing drum 26P with the dryer felt 16P disposed between the suction roll 42P
and the web WP. As shown in figure 18, the suction roll 42P is disposed towards from the web WP such that the web WP follows the felt 16P and not the blanket 24P downstream relative to the backing drum 26P.
However, after the web has been transferred to the dryer section, the suction roll 42P is moved away the blanket 24P, as shown in figure 19. The web WP remains in contact with the dryer felt 16P and continues to extend to ~ 3 ~ 8 the dryer section. Due to the application of suction to the web WP by the suction roll 42P, the web WP continues to follow the dryer felt 16P downstream relative to the suction roll 42P so that the web WP is transferred to the dryer section by the transfer means generally designated 36P. Alternatively, when the web WP has been established on the press blanket 24P, the suction roll 42P can be moved to the position shown in figure 18 and the web WP
will be transferred to the dryer section.
In operation of all of the various embodiments shown in figures 5 - 16 and 18 and 19 of the present invention, the web is transferred without open draw from a press nip to a dryer section. The web is pressed between a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip. The pressed web supported by the press blanket is transported from the press nip towards, and around, the backing drum.
The web is sandwiched between the blanket and a dryer felt which extends around a portion of the circumference of the backing drum. Vacuum is applied through the dryer felt downstream relative to the backing drum such that when the dryer felt diverges relative to the blanket downstream relative to the backing drum~ the web follows the dryer felt through the dryer section.
In operation of the embodiment shown in Figure 17, the web W0 follows in close conformity with the blanket 240 around the press member 340 downstream relative to the nip N10 and is transferred for the blan~et 240 by the vacuum box 440 to the dryer felt 160.
The present invention provides a simple and efficient means for transferring a pressed web without open draw from a press section to a dryer section without rewetting the web by contact of the web with a press felt. More particularly,, the present invention provides a simple means for transferring the pressed web from the smooth surface of a pressing blanket such that the web is trans-ferred without open draw to, and thereafter follows, a dryer felt through the dryer section.
Claims (19)
1. A transfer apparatus for transferring a web from a press nip to a dryer section, said apparatus comprising:
a backing roll;
a press member cooperating with said backing roll for defining therebetween the press nip;
a press blanket extending through the press nip such that the web is disposed between said blanket and said backing roll during passage of the web through the press nip;
a backing drum disposed downstream relative to the press nip such that said blanket and the web extend contiguously relative to each other from the press nip to said backing drum;
a dryer felt cooperating with said backing drum such that the web is disposed between said blanket and said felt during passage of said blanket, web and felt around said backing drum; and transfer means disposed adjacent to said backing drum for transferring the web without open draw from said blanket to said felt such that the web follows said felt through the dryer section.
a backing roll;
a press member cooperating with said backing roll for defining therebetween the press nip;
a press blanket extending through the press nip such that the web is disposed between said blanket and said backing roll during passage of the web through the press nip;
a backing drum disposed downstream relative to the press nip such that said blanket and the web extend contiguously relative to each other from the press nip to said backing drum;
a dryer felt cooperating with said backing drum such that the web is disposed between said blanket and said felt during passage of said blanket, web and felt around said backing drum; and transfer means disposed adjacent to said backing drum for transferring the web without open draw from said blanket to said felt such that the web follows said felt through the dryer section.
2. A transfer apparatus as set forth in claim 1 wherein said backing roll is vented.
3. A transfer apparatus as set forth in claim 2 wherein said backing roll defines a plurality of grooves such that water removed from the web during passage of the web through the press nip flows through said grooves for venting the press nip.
4. A transfer apparatus as set forth in claim 1 wherein said press member is a press shoe, said press shoe defining a concave surface which cooperates with said backing roll for defining therebetween an extended nip.
5. A transfer apparatus as set forth in claim 1 wherein said press member is a press roll.
6. A transfer apparatus as set forth in claim 1 wherein said press blanket is an impervious belt defining a smooth surface towards the web.
7. A transfer apparatus as set forth in claim 1 wherein said dryer felt extends around a portion of the circum-ference of said backing drum such that said felt, the web and said blanket together wrap around said portion of the circumference of said backing drum, said blanket and the web being disposed between said backing drum and said felt.
8. A transfer apparatus as set forth in claim 1 wherein said transfer means includes:
a vacuum transfer roll disposed downstream relative to said backing drum such that the web is disposed between said blanket and said felt from said backing drum to said vacuum transfer roll so that the web follows said felt when said felt diverges relative to said blanket downstream relative to said vacuum transfer roll.
a vacuum transfer roll disposed downstream relative to said backing drum such that the web is disposed between said blanket and said felt from said backing drum to said vacuum transfer roll so that the web follows said felt when said felt diverges relative to said blanket downstream relative to said vacuum transfer roll.
9. A transfer apparatus as set forth in claim 1 wherein said transfer means includes:
a vacuum box disposed downstream relative to said backing drum, said vacuum box being disposed.
adjacent to a joint run of said dryer felt and the web such that said dryer felt is disposed between the web and said vacuum box.
a vacuum box disposed downstream relative to said backing drum, said vacuum box being disposed.
adjacent to a joint run of said dryer felt and the web such that said dryer felt is disposed between the web and said vacuum box.
10. A transfer apparatus as set forth in claim 1 wherein said transfer means includes:
a vacuum box disposed radially relative to said backing drum such that when said vacuum box is connected to a source of partial vacuum, air flows through said vacuum box adjacent to said backing drum for drawing the web into close conformity with said dryer felt as said dryer felt diverges relative to said blanket thereby transferring the web without open draw to said dryer felt.
a vacuum box disposed radially relative to said backing drum such that when said vacuum box is connected to a source of partial vacuum, air flows through said vacuum box adjacent to said backing drum for drawing the web into close conformity with said dryer felt as said dryer felt diverges relative to said blanket thereby transferring the web without open draw to said dryer felt.
11. A transfer apparatus as set forth in claim 1 further including:
a dryer drum disposed downstream relative to said transfer means such that said dryer felt and the web extend contiguously relative to each other from said backing drum to said dryer drum.
a dryer drum disposed downstream relative to said transfer means such that said dryer felt and the web extend contiguously relative to each other from said backing drum to said dryer drum.
12. A transfer apparatus as set forth in claim 1 further including:
a grooved roll disposed downstream relative to said backing drum such that said dryer felt and the blanket extend contiguously relative to each other from said backing drum to said grooved roll.
a grooved roll disposed downstream relative to said backing drum such that said dryer felt and the blanket extend contiguously relative to each other from said backing drum to said grooved roll.
13. A transfer apparatus as set forth in claim 1 further including:
an adjustable guide roll disposed downstream relative to said backing drum for guiding said blanket, said guide roll being movable towards, and away from, said dryer felt;
said transfer means including:
a vacuum roll disposed downstream relative to said backing drum such that said dryer felt and the web extend contiguously from said backing drum to said vacuum roll so that in a first position of said guide roll, said guide roll is towards said vacuum roll so that said blanket, the web and said dryer felt extend contiguously from said backing drum to said vacuum roll for initially transferring the web from said blanket to said dryer felt and when said guide roll is disposed in a second position thereof away from said vacuum roll, the web continues to run contiguously with, and supported by, said dryer felt from said backing drum to said vacuum roll.
an adjustable guide roll disposed downstream relative to said backing drum for guiding said blanket, said guide roll being movable towards, and away from, said dryer felt;
said transfer means including:
a vacuum roll disposed downstream relative to said backing drum such that said dryer felt and the web extend contiguously from said backing drum to said vacuum roll so that in a first position of said guide roll, said guide roll is towards said vacuum roll so that said blanket, the web and said dryer felt extend contiguously from said backing drum to said vacuum roll for initially transferring the web from said blanket to said dryer felt and when said guide roll is disposed in a second position thereof away from said vacuum roll, the web continues to run contiguously with, and supported by, said dryer felt from said backing drum to said vacuum roll.
14. A transfer apparatus as set forth in claim 13 wherein said vacuum roll further includes:
a rotatable shell defining a plurality of air flow passages;
a vacuum chamber disposed adjacent to said dryer felt such that in use of the apparatus air flows through said passages into said vacuum chamber for drawing the web into close conformity with said dryer felt;
a pressure chamber defined by said vacuum roll and disposed diametrically opposite to said pressure chamber such that air flows from said pressure chamber through said passages outwardly away from said vacuum roll for cleaning said passages.
a rotatable shell defining a plurality of air flow passages;
a vacuum chamber disposed adjacent to said dryer felt such that in use of the apparatus air flows through said passages into said vacuum chamber for drawing the web into close conformity with said dryer felt;
a pressure chamber defined by said vacuum roll and disposed diametrically opposite to said pressure chamber such that air flows from said pressure chamber through said passages outwardly away from said vacuum roll for cleaning said passages.
15. A transfer apparatus as set forth in claim 1 further including:
a doctor disposed downstream relative to said backing drum for doctoring the web from said blanket.
a doctor disposed downstream relative to said backing drum for doctoring the web from said blanket.
16. A transfer apparatus as set forth in claim 1 wherein said transfer means includes:
a vacuum roll movable towards and away from said blanket;
said vacuum roll being disposed downstream relative to said backing drum such that said dryer felt and the web extend contiguously from said backing drum to said vacuum roll so that in a first position of said vacuum roll, said vacuum roll is towards said blanket so that said blanket, the web and said dryer felt extend contiguously from said backing drum to said vacuum roll for initially transferring the web from said blanket to said dryer felt and when said vacuum roll is disposed in a second position thereof away from said blanket, the web continues to run contiguously with, and supported by, said dryer felt from said backing drum to said vacuum roll.
a vacuum roll movable towards and away from said blanket;
said vacuum roll being disposed downstream relative to said backing drum such that said dryer felt and the web extend contiguously from said backing drum to said vacuum roll so that in a first position of said vacuum roll, said vacuum roll is towards said blanket so that said blanket, the web and said dryer felt extend contiguously from said backing drum to said vacuum roll for initially transferring the web from said blanket to said dryer felt and when said vacuum roll is disposed in a second position thereof away from said blanket, the web continues to run contiguously with, and supported by, said dryer felt from said backing drum to said vacuum roll.
17. A transfer apparatus for transferring a web from a press nip to a dryer section, said apparatus comprising:
a backing roll;
a press member cooperating with said backing roll for defining therebetween the press nip;
a press blanket extending through the press nip such that the web is disposed between said blanket and said backing roll during passage of the web through the press nip;
a backing drum disposed downstream relative to the press nip such that said blanket and the web extend contiguously relative to each other from the press nip to said backing drum;
a dryer felt cooperating with said backing drum such that the web is disposed between said blanket and said felt during passage of said blanket, web and felt around said backing drum;
an adjustable guide roll disposed downstream relative to said backing drum for guiding said blanket, said guide roll being movable towards, and away from, said dryer felt;
transfer means disposed downstream relative to said backing drum for transferring the web from said blanket to said felt such that the web follows said felt through the dryer section; and said transfer means being disposed downstream relative to said backing drum such that said dryer felt and the web extend contiguously from said backing drum to said transfer means so that in a first position of said guide roll, said guide roll is toward said transfer means so that said blanket, the web and said dryer felt extend contiguously from said backing drum to said transfer means for initially transferring the web from said blanket to said dryer felt and when said guide roll is disposed in a second position thereof away from said transfer means, the web continues to run contiguously with, and supported by, said dryer felt from said backing drum to said transfer means.
a backing roll;
a press member cooperating with said backing roll for defining therebetween the press nip;
a press blanket extending through the press nip such that the web is disposed between said blanket and said backing roll during passage of the web through the press nip;
a backing drum disposed downstream relative to the press nip such that said blanket and the web extend contiguously relative to each other from the press nip to said backing drum;
a dryer felt cooperating with said backing drum such that the web is disposed between said blanket and said felt during passage of said blanket, web and felt around said backing drum;
an adjustable guide roll disposed downstream relative to said backing drum for guiding said blanket, said guide roll being movable towards, and away from, said dryer felt;
transfer means disposed downstream relative to said backing drum for transferring the web from said blanket to said felt such that the web follows said felt through the dryer section; and said transfer means being disposed downstream relative to said backing drum such that said dryer felt and the web extend contiguously from said backing drum to said transfer means so that in a first position of said guide roll, said guide roll is toward said transfer means so that said blanket, the web and said dryer felt extend contiguously from said backing drum to said transfer means for initially transferring the web from said blanket to said dryer felt and when said guide roll is disposed in a second position thereof away from said transfer means, the web continues to run contiguously with, and supported by, said dryer felt from said backing drum to said transfer means.
18. A transfer apparatus for transferring a web from a press nip to a dryer section, said apparatus comprising:
a backing roll;
a press member cooperating with said backing roll for defining therebetween the press nip;
a press blanket extending through the press nip such that the web is disposed between said blanket and said backing roll during passage of the web through the press nip;
a dryer felt cooperating with said press member downstream relative to said press nip such that the web is disposed between said blanket and said felt downstream relative to said press nip;
and transfer means disposed downstream relative to said press nip and adjacent to said press member for transferring the web without open draw from said blanket to said felt such that the web follows said felt through the dryer section.
a backing roll;
a press member cooperating with said backing roll for defining therebetween the press nip;
a press blanket extending through the press nip such that the web is disposed between said blanket and said backing roll during passage of the web through the press nip;
a dryer felt cooperating with said press member downstream relative to said press nip such that the web is disposed between said blanket and said felt downstream relative to said press nip;
and transfer means disposed downstream relative to said press nip and adjacent to said press member for transferring the web without open draw from said blanket to said felt such that the web follows said felt through the dryer section.
19. A method of transferring a web from a press nip to a dryer section, said method comprising the steps of:
pressing the web between a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip;
transporting the pressed web supported by a press blanket from the press nip towards, and around, a backing drum;
sandwiching the web between the blanket and a dryer felt which extends around a portion of the circumference of the backing drum; and applying a vacuum through the dryer felt downstream relative to the backing drum such that when the dryer felt diverges relative to the blanket downstream relative to the backing drum, the web follows the dryer felt through the dryer section.
pressing the web between a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip;
transporting the pressed web supported by a press blanket from the press nip towards, and around, a backing drum;
sandwiching the web between the blanket and a dryer felt which extends around a portion of the circumference of the backing drum; and applying a vacuum through the dryer felt downstream relative to the backing drum such that when the dryer felt diverges relative to the blanket downstream relative to the backing drum, the web follows the dryer felt through the dryer section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US197,537 | 1988-05-23 | ||
| US07/197,537 US4943351A (en) | 1988-05-23 | 1988-05-23 | Transfer apparatus and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1313788C true CA1313788C (en) | 1993-02-23 |
Family
ID=22729804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000594457A Expired - Lifetime CA1313788C (en) | 1988-05-23 | 1989-03-22 | Transfer apparatus |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US4943351A (en) |
| EP (1) | EP0344088B1 (en) |
| JP (1) | JPH0219589A (en) |
| KR (1) | KR0130065B1 (en) |
| BR (1) | BR8902368A (en) |
| CA (1) | CA1313788C (en) |
| DE (1) | DE68914328T2 (en) |
| ES (1) | ES2050838T3 (en) |
| FI (1) | FI93130C (en) |
| MX (1) | MX166419B (en) |
| PH (1) | PH25939A (en) |
| PL (1) | PL162950B1 (en) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5507104A (en) * | 1987-02-13 | 1996-04-16 | Beloit Technologies, Inc. | Web drying apparatus |
| US6049999A (en) * | 1987-02-13 | 2000-04-18 | Beloit Technologies, Inc. | Machine and process for the restrained drying of a paper web |
| US5404653A (en) | 1987-02-13 | 1995-04-11 | Beloit Technologies, Inc. | Apparatus for drying a web |
| DE3914761A1 (en) * | 1989-03-08 | 1990-11-15 | Voith Gmbh J M | GUIDE ROLLER FOR A POROUS BAND, FOR EXAMPLE FOR A DRY SCREEN OF A PAPER MACHINE |
| FR2656012A1 (en) * | 1989-12-15 | 1991-06-21 | Cofpa | Press for the manufacture of paper sheets with felts and rolls, wet and drying |
| FR2656011A1 (en) * | 1989-12-15 | 1991-06-21 | Cofpa | Press for the manufacture of sheets of paper with felts and rolls, wet and drying |
| JP2549869Y2 (en) * | 1990-08-28 | 1997-10-08 | 三菱重工業株式会社 | Paper passing machine for paper machine press part |
| US5389205A (en) * | 1990-11-23 | 1995-02-14 | Valmet Paper Machinery, Inc. | Method for dewatering of a paper web by pressing using an extended nip shoe pre-press zone on the forming wire |
| DE4116222A1 (en) * | 1991-05-17 | 1992-11-19 | Voith Gmbh J M | RAILWAY APPARATUS |
| DE4119068C2 (en) * | 1991-06-10 | 1999-04-01 | Voith Sulzer Papiermasch Gmbh | Device for connecting two dryer groups of a paper machine |
| US5393383A (en) * | 1991-12-19 | 1995-02-28 | Valmet Paper Machinery Inc. | Compact press section with closed draw of the web in a paper machine |
| US5611892A (en) * | 1991-12-19 | 1997-03-18 | Valmet Corporation | Compact press section in a paper machine |
| DE4222034A1 (en) * | 1992-07-04 | 1994-01-05 | Voith Gmbh J M | Press section for web-water extn. during paper-making - has cutter and removal system to trim web ends and remove cut strips from impermeable belt, etc. |
| FI108054B (en) * | 1994-05-31 | 2001-11-15 | Metso Paper Inc | Method for stabilizing the course of a paper web in conjunction with a paper guide roll especially between the press portion and the drying portion and apparatus for carrying out the method |
| DE4427281A1 (en) * | 1994-08-02 | 1996-02-08 | Voith Gmbh J M | Threading up fibrous material lines esp. paper making machines |
| FI95610C (en) * | 1994-10-06 | 1996-02-26 | Valmet Paper Machinery Inc | Press section of a paper machine equipped with a compensating press |
| US5876565A (en) * | 1994-10-06 | 1999-03-02 | Valmet Corporation | Press section with an equalizing nip for compensating for elongation of a paper web |
| FI109477B (en) * | 1995-02-02 | 2002-08-15 | Metso Paper Inc | Press section with equalizing press in paper machine |
| FI110440B (en) * | 1996-04-04 | 2003-01-31 | Metso Paper Inc | Transferring the web from the last press nip in the paper machine to the next drying section |
| DK172260B1 (en) * | 1996-12-20 | 1998-02-09 | M & J Fibretech | Nonwoven fiber product manufacturing plant. |
| DE19713645A1 (en) * | 1997-04-02 | 1998-10-08 | Voith Sulzer Papiermasch Gmbh | Papermaking machine web transfer |
| DE19744341A1 (en) * | 1997-10-07 | 1999-04-15 | Voith Sulzer Papiertech Patent | Paper machine |
| SE514973C2 (en) * | 1999-09-07 | 2001-05-21 | Valmet Karlstad Ab | Method and paper machine for making a liner |
| EP1158092B1 (en) * | 2000-05-24 | 2006-09-06 | Voith Paper Patent GmbH | Drying section |
| FR2830263B1 (en) * | 2001-10-03 | 2004-08-06 | Thibeau | METHOD AND INSTALLATION FOR THE PRODUCTION OF A CONDENSED NONWOVEN, AND DEVICE FOR CONDENSING A NONWOVEN |
| US7001487B2 (en) * | 2001-12-19 | 2006-02-21 | Kimberly-Clark Worldwide, Inc. | Method and apparatus for transporting a sheet from a dryer to a reel |
| US7070406B2 (en) * | 2003-04-29 | 2006-07-04 | Hewlett-Packard Development Company, L.P. | Apparatus for embossing a flexible substrate with a pattern carried by an optically transparent compliant media |
| CN101694076A (en) * | 2003-05-13 | 2010-04-14 | 王子制纸株式会社 | Press for paper machine with smoothing press and paper manufacturing method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3250019A (en) * | 1962-09-10 | 1966-05-10 | Edward D Beachler | Dryer felt |
| FI81854C (en) * | 1982-09-15 | 1990-12-10 | Valmet Oy | PRESS SPRING WITH PRESS SHEET I EN PAPER MACHINERY. |
| US4483745A (en) * | 1982-09-29 | 1984-11-20 | Beloit Corporation | Method and apparatus of sheet transfer using a nonporous smooth surfaced belt |
| US4551203A (en) * | 1984-04-02 | 1985-11-05 | Valmet Oy | Method and arrangement for guiding a paper web from the press section to the drying section |
| DE3425077A1 (en) * | 1984-05-25 | 1985-11-28 | Sulzer-Escher Wyss GmbH, 7980 Ravensburg | DOUBLE SCREEN PAPER |
-
1988
- 1988-05-23 US US07/197,537 patent/US4943351A/en not_active Expired - Lifetime
-
1989
- 1989-03-22 CA CA000594457A patent/CA1313788C/en not_active Expired - Lifetime
- 1989-05-09 PH PH38627A patent/PH25939A/en unknown
- 1989-05-18 DE DE68914328T patent/DE68914328T2/en not_active Expired - Lifetime
- 1989-05-18 EP EP89630096A patent/EP0344088B1/en not_active Expired - Lifetime
- 1989-05-18 ES ES89630096T patent/ES2050838T3/en not_active Expired - Lifetime
- 1989-05-22 JP JP1126832A patent/JPH0219589A/en active Granted
- 1989-05-22 FI FI892479A patent/FI93130C/en not_active IP Right Cessation
- 1989-05-23 KR KR1019890006951A patent/KR0130065B1/en not_active IP Right Cessation
- 1989-05-23 BR BR898902368A patent/BR8902368A/en not_active IP Right Cessation
- 1989-05-23 MX MX016157A patent/MX166419B/en unknown
- 1989-05-23 PL PL27958789A patent/PL162950B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP0344088B1 (en) | 1994-04-06 |
| MX166419B (en) | 1993-01-07 |
| PH25939A (en) | 1991-12-19 |
| KR900018472A (en) | 1990-12-21 |
| PL279587A1 (en) | 1989-12-27 |
| DE68914328T2 (en) | 1995-01-05 |
| FI892479A0 (en) | 1989-05-22 |
| FI93130C (en) | 1996-04-29 |
| DE68914328D1 (en) | 1994-05-11 |
| JPH0345156B2 (en) | 1991-07-10 |
| BR8902368A (en) | 1990-01-16 |
| JPH0219589A (en) | 1990-01-23 |
| US4943351A (en) | 1990-07-24 |
| KR0130065B1 (en) | 1998-04-07 |
| EP0344088A2 (en) | 1989-11-29 |
| FI892479A (en) | 1989-11-24 |
| ES2050838T3 (en) | 1994-06-01 |
| FI93130B (en) | 1994-11-15 |
| EP0344088A3 (en) | 1990-11-22 |
| PL162950B1 (en) | 1994-01-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKEC | Expiry (correction) |
Effective date: 20121205 |