CA2168754C - Pre-press for a paper web - Google Patents
Pre-press for a paper webInfo
- Publication number
- CA2168754C CA2168754C CA002168754A CA2168754A CA2168754C CA 2168754 C CA2168754 C CA 2168754C CA 002168754 A CA002168754 A CA 002168754A CA 2168754 A CA2168754 A CA 2168754A CA 2168754 C CA2168754 C CA 2168754C
- Authority
- CA
- Canada
- Prior art keywords
- load shoe
- press
- web
- wire
- shoe
- 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 - Fee Related
Links
Classifications
-
- 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
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
Abstract
The present invention relates to a pre-press for a paper web (W). The pre-press comprises a load shoe (10) pressed against a backing element, preferably a vac roll (11), at a pressure providing load pressure by a medium, preferably liquid, said medium acting at the same time as lubrication medium.
Description
~ WO 95!33885 ~ ~ PCT/FI95/00284 Pre-press for a paper web The present invention relates to a pre-press for a paper web.
So-called pre-press equipment are known of prior art in paper drying in which a separate load shoe is used, preferably in conjunction with a vacuum) roll. The vac roll is a roll design provided with a vacuum box thereinside, with the aid of vacuum directed whereat water is drawn off from the web as the roll comprises perforation in its shell and preferably also a separate circumferential grooving. A
drawback in the pre-press arrangements has been how to find an appropriate operating system for the load shoe. Use of oil as the operating liquid of the load shoe causes that the apparatus arrangement is required to be well housed in order to prevent leakages of oil.
In the present application an apparatus design of novel type is disclosed for using the load shoe of a pre-press for paper web. It is suggested in the application that for the operation liquid of the load shoe, the same liquid is used as for lubrication of the shoe. Preferably and most preferably it is water which is used, that is, the very same liquid which is being removed from the web. Therefore, the system can be open and there is no need to house and shelter it outwards. The spilled water is gathered in a gathering trough in the adjacency of the shoe and is conducted back into circulation.
In the pre-press design, in the wire section the water removal is intensified by pressing the load shoe against the vac roll. The web is conducted between the press shoe and the vac roll preferably between two wires or felts. For the load liquid of the shoe press, water is used in a design according to the invention. In the design of the invention, the water serves thus both as lubrication medium and as a medium producing simultaneous load pressure. With the aid of water the shoe is pressed against the back roll. The wire on the side of the shoe may be water-permeable, slightly water-permeable or water-impermeable. The water is pumped from a water container along the pipes at load pressure into one or more loading chambers, whereby the pressure of the water exerts an effect on the load shoe, pressing it against the backing surface. The water acts at the same time as lubrication medium. From the pressure volume in conjunction with the load shoe, a passage is provided to the front surface of the load shoe and preferably to a groove on the front edge of the load shoe relative to the propagation direction of the web. So, the lubrication medium, preferably water, is conducted to the front edge of the load shoe and a mobile felt transfers the lubrication medium in the form of film to the surface of the load shoe. On the other side of the load shoe, the lubrication medium is gathered into a trough and conducted further back into water circulation.
The pre-press of the invention is characterized in that the pre-press comprises a load shoe which is pressed against a backing element, preferably a vac roll, at a pressure of a medium, preferably of liquid, providing load pressure, the liquid acting at the same time as lubrication medium.
In accordance with one aspect of the present invention, there is provided a press for pressing a paper web as the web is supported in direct engagement with a water permeable first wire, comprising a load shoe arranged in a loop of the first wire, the load shoe having a front surface in direct engagement with the first wire, a backing element situated in opposed relationship to a front surface of the load shoe, first means for directing a fluid pressure medium to press the load shoe toward the backing element, and second means for directing the pressure medium onto the front surface of the load shoe to lubricate the front surface of the load shoe.
The present invention includes, in a further aspect thereof, a method for pressing a paper web, comprising the steps of supporting the web in direct engagement with a water permeable first wire, arranging a load shoe in a loop of the first wire such that a front surface of the load shoe is in direct engagement with the first wire and in opposed relationship to a backing element, pressing the load shoe toward the backing element by 2a means of pressure provided by a fluid medium, and lubricating the front surface of the load shoe by directing the fluid medium thereto.
In accordance with another aspect of the present invention, there is provided a method for pressing a paper web, comprising the steps of supporting the web in direct engagement with a water-permeable first wire, arranging a load shoe in a loop of the first wire such that a front surface of the load shoe is in direct engagement with the first wire, arranging a suction roll in opposed relationship to the load shoe such that the first wire passes between the suction roll and the load shoe, pressing the load shoe toward the suction roll by means of pressure provided by a fluid medium, lubricating the front surface of the load shoe by directing the fluid medium thereto, and applying negative pressure through a suction zone of the suction roll such that the fluid medium is drawn into the suction roll through the first wire and the web and water from the web is drawn into the suction roll.
An additional aspect of the present invention provides a press for pressing a paper web as the web is supported in direct engagement with a water-permeable first wire, comprising a load shoe arranged in a loop of the first wire, the load shoe having a front surface in direct engagement with the first wire, a backing element situated in opposed relationship to a front surface of the load shoe such that the first wire passes between the backing element and the load shoe, first means for directing a fluid pressure medium to press the load shoe toward the backing element, second means for directing the pressure medium onto the front surface of the load shoe to lubricate the front surface of the load shoe, and wherein the backing element is a suction roll having a suction zone opening toward the front surface of the load shoe, a suction force being applied through the suction zone in the suction roll to draw the pressure medium and water removed from the web into the suction zone.
The invention is described below refernng to certain preferred embodiments presented in the Figures of the accompanying drawings, whereto the invention is not, however, intended to be exclusively restricted.
2b Fig. 1 presents a pre-press of the invention as cross-section image.
Fig. 2 presents the lubrication medium/load medium circulation arrangement of the pre-press as shown in Fig. 1 in machine direction.
Fig. 3 presents the apparatus design in a more comprehensive S context.
In the design shown in Fig. 1 a nip N, is produced between the load show 10 and the back roll, preferably vac roll 11. The wires/weaves H1 and HZ and web W therebetween are conducted via nip Nl. Water removal occurs in nip N, into an internal vacuum space O in the vac roll. The suction effect is intensified by pressing the load show 10 against the surface 11'a of the shell l la of the vac roll 11. In the ,,TWO 95/33885 ~ ~ PCT/FI95/00284 design presented in the figure, the load shoe 10 is connected to a seat 13.
The load shoe 10 comprises a cross-section profile which is provided with a web plate part l0a and branch parts l Ob 1, l Od2. The seat 13 comprises a web plate part 13a and branch parts 13b 1, 13b2, and on the ends of the branch parts, inward edges 13d 1, 13d2. In the middle of the web plate part 13a, a neck 13c has been furthermore provided, whereby in the spaces E 1 and E2 defined between the neck and the side walls 13b 1, 13b2, a load shoe 10 has been disposed at side branches l Ob 1, l Ob2.
Medium, preferably water, is conducted by pressure via channel 15 into a space between the neck 13c of the seat 13 and the load shoe 10; into chamber D and from said space D it is conducted onwards via channel ~16 into groove 17 on the front surface 10' of the load shoe. The medium is liquid, preferably water or aqueous mixture. The groove 17 has been arranged to pass on the length of the entire load shoe. In space D the pressure of the medium affects at a force on the undersurface of the web plate part l0a of the load shoe 10, pressing the load shoe 10 against its abutting surface, preferably against the outer surface 11 a' of the shell 11 a of the vac roll 11. Web W and the wires / weaves H 1 and H2 pass via said surfaces; via the nip N1 between the front surface 10' of the load shoe 10 and the outer surface 11'a of the shell 11 a of the vac roll 11. The medium, being preferably water, is con-ducted via branch channel C 1, C2 . . . of the manifold J within the frame beam P into space D. The spilled water and the water leaving the load shoe are conducted into trough 20 and onwards back into water circulation. The pre-press shown in Fig.
comprises a vac roll 11 as a second backing element. Another roll may also be used instead of vac roll 11, such as a roll provided with recessed surface.
Fig. 2 presents a liquid circulation arrangement of a pre-press according to the invention. V is the branch channels C 1, C2 . . . of the manifold J within the frame beam P, the medium is conducted to one or more chambers D between the undersur-face of the load shoe 10 and the seat 13, and the load shoe 10 is pressed in line with the surfaces of the branch parts 13b 1,13b2 of the seat 13 towards the backing element 11, e.g. especially towards the vac roll 11. The water discharged from the load shoe 10 with felt H2 is conducted into a collector tank 20 and then along a ~6~~ ~ ~
So-called pre-press equipment are known of prior art in paper drying in which a separate load shoe is used, preferably in conjunction with a vacuum) roll. The vac roll is a roll design provided with a vacuum box thereinside, with the aid of vacuum directed whereat water is drawn off from the web as the roll comprises perforation in its shell and preferably also a separate circumferential grooving. A
drawback in the pre-press arrangements has been how to find an appropriate operating system for the load shoe. Use of oil as the operating liquid of the load shoe causes that the apparatus arrangement is required to be well housed in order to prevent leakages of oil.
In the present application an apparatus design of novel type is disclosed for using the load shoe of a pre-press for paper web. It is suggested in the application that for the operation liquid of the load shoe, the same liquid is used as for lubrication of the shoe. Preferably and most preferably it is water which is used, that is, the very same liquid which is being removed from the web. Therefore, the system can be open and there is no need to house and shelter it outwards. The spilled water is gathered in a gathering trough in the adjacency of the shoe and is conducted back into circulation.
In the pre-press design, in the wire section the water removal is intensified by pressing the load shoe against the vac roll. The web is conducted between the press shoe and the vac roll preferably between two wires or felts. For the load liquid of the shoe press, water is used in a design according to the invention. In the design of the invention, the water serves thus both as lubrication medium and as a medium producing simultaneous load pressure. With the aid of water the shoe is pressed against the back roll. The wire on the side of the shoe may be water-permeable, slightly water-permeable or water-impermeable. The water is pumped from a water container along the pipes at load pressure into one or more loading chambers, whereby the pressure of the water exerts an effect on the load shoe, pressing it against the backing surface. The water acts at the same time as lubrication medium. From the pressure volume in conjunction with the load shoe, a passage is provided to the front surface of the load shoe and preferably to a groove on the front edge of the load shoe relative to the propagation direction of the web. So, the lubrication medium, preferably water, is conducted to the front edge of the load shoe and a mobile felt transfers the lubrication medium in the form of film to the surface of the load shoe. On the other side of the load shoe, the lubrication medium is gathered into a trough and conducted further back into water circulation.
The pre-press of the invention is characterized in that the pre-press comprises a load shoe which is pressed against a backing element, preferably a vac roll, at a pressure of a medium, preferably of liquid, providing load pressure, the liquid acting at the same time as lubrication medium.
In accordance with one aspect of the present invention, there is provided a press for pressing a paper web as the web is supported in direct engagement with a water permeable first wire, comprising a load shoe arranged in a loop of the first wire, the load shoe having a front surface in direct engagement with the first wire, a backing element situated in opposed relationship to a front surface of the load shoe, first means for directing a fluid pressure medium to press the load shoe toward the backing element, and second means for directing the pressure medium onto the front surface of the load shoe to lubricate the front surface of the load shoe.
The present invention includes, in a further aspect thereof, a method for pressing a paper web, comprising the steps of supporting the web in direct engagement with a water permeable first wire, arranging a load shoe in a loop of the first wire such that a front surface of the load shoe is in direct engagement with the first wire and in opposed relationship to a backing element, pressing the load shoe toward the backing element by 2a means of pressure provided by a fluid medium, and lubricating the front surface of the load shoe by directing the fluid medium thereto.
In accordance with another aspect of the present invention, there is provided a method for pressing a paper web, comprising the steps of supporting the web in direct engagement with a water-permeable first wire, arranging a load shoe in a loop of the first wire such that a front surface of the load shoe is in direct engagement with the first wire, arranging a suction roll in opposed relationship to the load shoe such that the first wire passes between the suction roll and the load shoe, pressing the load shoe toward the suction roll by means of pressure provided by a fluid medium, lubricating the front surface of the load shoe by directing the fluid medium thereto, and applying negative pressure through a suction zone of the suction roll such that the fluid medium is drawn into the suction roll through the first wire and the web and water from the web is drawn into the suction roll.
An additional aspect of the present invention provides a press for pressing a paper web as the web is supported in direct engagement with a water-permeable first wire, comprising a load shoe arranged in a loop of the first wire, the load shoe having a front surface in direct engagement with the first wire, a backing element situated in opposed relationship to a front surface of the load shoe such that the first wire passes between the backing element and the load shoe, first means for directing a fluid pressure medium to press the load shoe toward the backing element, second means for directing the pressure medium onto the front surface of the load shoe to lubricate the front surface of the load shoe, and wherein the backing element is a suction roll having a suction zone opening toward the front surface of the load shoe, a suction force being applied through the suction zone in the suction roll to draw the pressure medium and water removed from the web into the suction zone.
The invention is described below refernng to certain preferred embodiments presented in the Figures of the accompanying drawings, whereto the invention is not, however, intended to be exclusively restricted.
2b Fig. 1 presents a pre-press of the invention as cross-section image.
Fig. 2 presents the lubrication medium/load medium circulation arrangement of the pre-press as shown in Fig. 1 in machine direction.
Fig. 3 presents the apparatus design in a more comprehensive S context.
In the design shown in Fig. 1 a nip N, is produced between the load show 10 and the back roll, preferably vac roll 11. The wires/weaves H1 and HZ and web W therebetween are conducted via nip Nl. Water removal occurs in nip N, into an internal vacuum space O in the vac roll. The suction effect is intensified by pressing the load show 10 against the surface 11'a of the shell l la of the vac roll 11. In the ,,TWO 95/33885 ~ ~ PCT/FI95/00284 design presented in the figure, the load shoe 10 is connected to a seat 13.
The load shoe 10 comprises a cross-section profile which is provided with a web plate part l0a and branch parts l Ob 1, l Od2. The seat 13 comprises a web plate part 13a and branch parts 13b 1, 13b2, and on the ends of the branch parts, inward edges 13d 1, 13d2. In the middle of the web plate part 13a, a neck 13c has been furthermore provided, whereby in the spaces E 1 and E2 defined between the neck and the side walls 13b 1, 13b2, a load shoe 10 has been disposed at side branches l Ob 1, l Ob2.
Medium, preferably water, is conducted by pressure via channel 15 into a space between the neck 13c of the seat 13 and the load shoe 10; into chamber D and from said space D it is conducted onwards via channel ~16 into groove 17 on the front surface 10' of the load shoe. The medium is liquid, preferably water or aqueous mixture. The groove 17 has been arranged to pass on the length of the entire load shoe. In space D the pressure of the medium affects at a force on the undersurface of the web plate part l0a of the load shoe 10, pressing the load shoe 10 against its abutting surface, preferably against the outer surface 11 a' of the shell 11 a of the vac roll 11. Web W and the wires / weaves H 1 and H2 pass via said surfaces; via the nip N1 between the front surface 10' of the load shoe 10 and the outer surface 11'a of the shell 11 a of the vac roll 11. The medium, being preferably water, is con-ducted via branch channel C 1, C2 . . . of the manifold J within the frame beam P into space D. The spilled water and the water leaving the load shoe are conducted into trough 20 and onwards back into water circulation. The pre-press shown in Fig.
comprises a vac roll 11 as a second backing element. Another roll may also be used instead of vac roll 11, such as a roll provided with recessed surface.
Fig. 2 presents a liquid circulation arrangement of a pre-press according to the invention. V is the branch channels C 1, C2 . . . of the manifold J within the frame beam P, the medium is conducted to one or more chambers D between the undersur-face of the load shoe 10 and the seat 13, and the load shoe 10 is pressed in line with the surfaces of the branch parts 13b 1,13b2 of the seat 13 towards the backing element 11, e.g. especially towards the vac roll 11. The water discharged from the load shoe 10 with felt H2 is conducted into a collector tank 20 and then along a ~6~~ ~ ~
channel 21 into a liquid container 22 and furthermore, pumped by pump 23, along channel 24 back into manifold J to be back in the adjacency with the load shoe 10.
Fig. 3 shows the means design in a wider context. The travelling of web W is presented by arrows Ll and the circulation directions of felt transfers with arrows L2 and L3. Web W is conducted from felt circulation H3 and the web is transferred in line with felt H 1 between felt H 1 and felt H2, and into nip N 1. The water is gathered in trough 20 and moved back into manifold J.
Fig. 3 shows the means design in a wider context. The travelling of web W is presented by arrows Ll and the circulation directions of felt transfers with arrows L2 and L3. Web W is conducted from felt circulation H3 and the web is transferred in line with felt H 1 between felt H 1 and felt H2, and into nip N 1. The water is gathered in trough 20 and moved back into manifold J.
Claims (27)
1. A press for pressing a paper web as the web is supported in direct engagement with a water permeable first wire, comprising a load shoe arranged in a loop of the first wire, said load shoe having a front surface in direct engagement with the first wire, a backing element situated in opposed relationship to a front surface of said load shoe, first means for directing a fluid pressure medium to press said load shoe toward said backing element, and second means for directing said pressure medium onto said front surface of said load shoe to lubricate said front surface of said load shoe.
2. The press of claim 1, wherein said first means comprise a chamber defined in part by said load shoe, said second means comprising a groove situated at a front edge of said front surface of said load shoe proximate to said backing element, and a channel in said load shoe connecting said chamber and said groove, said pressure medium being conducted from said chamber via said channel to said groove.
3. The press of claim 1, further comprising a seat arranged adjacent to said load shoe, said load shoe comprising a web plate part, said first means comprising a chamber defined between said seat and a rear surface of said web plate part of said load shoe.
4. The press of claim 3, wherein said load shoe further comprises branch parts extending from said web plate part, said seat comprising a neck portion and a pair of side walls spaced from said neck portion to define spaces therebetween, each of said branch parts being situated and movable within one of said spaces.
5. The press of claim 4, further comprising a channel arranged in said neck portion, said pressure medium being directed through said channel into said chamber.
6. The press of claim 2, wherein said groove extends substantially over the entire length of said load shoe in the cross-machine direction.
7. The press of claim 1, wherein said first means comprise a chamber defined in part by said load shoe, further comprising a trough arranged at in an area of a trailing side of said load shoe, the trailing side of said load shoe being defined as the side from which the first wire exits from a nip formed between said load shoe and said backing element, said trough receiving water carried by the first wire from the nip, a frame beam to which said load shoe is movably mounted, at least one branch channel arranged in connection with said frame beam for supplying said pressure medium to press said load shoe, and a water circulation arrangement connected to said trough and receiving water therefrom, said water circulation arrangement directing water to said chamber communicating with the load shoe, said water circulation arrangement comprising pump means for pumping said pressure medium.
8. The press of claim 1, wherein said pressure medium is water or an aqueous mixture.
9. The press of claim 1, wherein said backing element is a vacuum roll comprising means defining a vacuum chamber.
10. The press of claim 1, wherein said front surface of said load shoe is in nip-defining relationship with said backing element.
11. The press of claim 1, further comprising a seat arranged adjacent to said load shoe, said load shoe comprising a web plate part, said first means comprising a plurality of individual chambers defined between said seat and a rear surface of said web plate part of said load shoe.
12. The press of claim 11, further comprising a plurality of channels arranged in said neck portion, one of said channels connecting to a respective one of said chambers, and a manifold for distributing said pressure medium to said plurality of channels.
13. The press of claim 11, wherein said plurality of individual chambers are defined by projections on a rear surface of said web plate part and projections on a front surface of said neck portion.
14. The press of claim 4, wherein said seat further comprises an inwardly directed portion connected to each of said branch parts to substantially close said spaces such that said branch parts are limited in movement within said spaces.
15. The press of claim 1, wherein the press is situated between a forming section and a press section of a paper machine, the web being in direct engagement with a second wire such that the web is supported by and between said first and second wires between said load shoe and said backing element.
16. A press for pressing a paper web situated between a forming section and a press section of a paper machine, the press including a load shoe and a backing element situated in opposed relationship to a front surface of said load shoe, the web being supported in direct engagement with a water permeable first wire, said load shoe being arranged in a loop of the first wire, the improvement comprising said front surface of said load shoe being arranged in direct engagement with the first wire, first means for directing a fluid pressure medium to press said load shoe toward said backing element, and second means for directing said pressure medium onto said front surface of said load shoe.
17. The press of claim 16, wherein said first means comprise a chamber defined in part by said load shoe, said second means comprising a groove situated at a front edge of said front surface of said load shoe proximate to said backing element, and a channel in said load shoe connecting said chamber and said groove, said pressure medium being conducted from said chamber via said channel to said groove.
18. The press of claim 16, further comprising a seat arranged adjacent to said load shoe, said load shoe comprising a web plate part, said means comprising a chamber defined between said seat and a rear surface of said web plate part of said load shoe.
19. A method for pressing a paper web, comprising the steps of:
supporting the web in direct engagement with a water permeable first wire, arranging a load shoe in a loop of the first wire such that a front surface of said load shoe is in direct engagement with the first wire and in opposed relationship to a backing element, pressing said load shoe toward said backing element by means of pressure provided by a fluid medium, and lubricating said front surface of said load shoe by directing the fluid medium thereto.
supporting the web in direct engagement with a water permeable first wire, arranging a load shoe in a loop of the first wire such that a front surface of said load shoe is in direct engagement with the first wire and in opposed relationship to a backing element, pressing said load shoe toward said backing element by means of pressure provided by a fluid medium, and lubricating said front surface of said load shoe by directing the fluid medium thereto.
20. The method of claim 19, wherein the fluid medium is water, further comprising the steps of:
forming a nip between said load shoe and said backing element, collecting water removed in the nip from the first wire and the web in a trough after the first wire and web have passed through the nip, and recirculating the water from the trough to press said load shoe and lubricate said front surface of said load shoe.
forming a nip between said load shoe and said backing element, collecting water removed in the nip from the first wire and the web in a trough after the first wire and web have passed through the nip, and recirculating the water from the trough to press said load shoe and lubricate said front surface of said load shoe.
21. A method for pressing a paper web, comprising the steps of:
supporting the web in direct engagement with a water-permeable first wire, arranging a load shoe in a loop of the first wire such that a front surface of said load shoe is in direct engagement with the first wire, arranging a suction roll in opposed relationship to said load shoe such that the first wire passes between said suction roll and said load shoe, pressing said load shoe toward said suction roll by means of pressure provided by a fluid medium, lubricating said front surface of said load shoe by directing the fluid medium thereto, and applying negative pressure through a suction zone of said suction roll such that the fluid medium is drawn into said suction roll through the first wire and the web and water from the web is drawn into said suction roll.
supporting the web in direct engagement with a water-permeable first wire, arranging a load shoe in a loop of the first wire such that a front surface of said load shoe is in direct engagement with the first wire, arranging a suction roll in opposed relationship to said load shoe such that the first wire passes between said suction roll and said load shoe, pressing said load shoe toward said suction roll by means of pressure provided by a fluid medium, lubricating said front surface of said load shoe by directing the fluid medium thereto, and applying negative pressure through a suction zone of said suction roll such that the fluid medium is drawn into said suction roll through the first wire and the web and water from the web is drawn into said suction roll.
22. A method of claim 21, further comprises the step of:
supporting the web in direct engagement with a water-permeable second wire, and passing the second wire between the web and said suction roll, whereby the fluid medium is drawn into said suction roll through the first wire, the web and the second wire and water from the web is drawn into said suction roll through the second wire.
supporting the web in direct engagement with a water-permeable second wire, and passing the second wire between the web and said suction roll, whereby the fluid medium is drawn into said suction roll through the first wire, the web and the second wire and water from the web is drawn into said suction roll through the second wire.
23. The method of claim 21, further comprising the steps of:
arranging said suction roll in nip-defining relationship with said load shoe, and pressing said load shoe against said suction roll to intensify the dewatering of the web.
arranging said suction roll in nip-defining relationship with said load shoe, and pressing said load shoe against said suction roll to intensify the dewatering of the web.
24. The method of claim 21, further comprising the steps of:
arranging said load shoe and said suction roll at a location between a forming section and a press section of a paper machine, supporting the web in direct engagement with a water-permeable second wire, arranging said suction roll in nip-defining relationship with said load shoe, and passing the web supported by and between the first and second wires between said load shoe and said suction roll.
arranging said load shoe and said suction roll at a location between a forming section and a press section of a paper machine, supporting the web in direct engagement with a water-permeable second wire, arranging said suction roll in nip-defining relationship with said load shoe, and passing the web supported by and between the first and second wires between said load shoe and said suction roll.
25. A press for pressing a paper web as the web is supported in direct engagement with a water-permeable first wire, comprising a load shoe arranged in a loop of the first wire, said load shoe having a front surface in direct engagement with the first wire, a backing element situated in opposed relationship to a front surface of said load shoe such that the first wire passes between said backing element and said load shoe, first means for directing a fluid pressure medium to press said load shoe toward said backing element, second means for directing said pressure medium onto said front surface of said load shoe to lubricate said front surface of said load shoe, and wherein said backing element is a suction roll having a suction zone opening toward said front surface of the load shoe, a suction force being applied through said suction zone in said suction roll to draw said pressure medium and water removed from the web into said suction zone.
26. The press of claim 25, wherein said pressure medium is water or an aqueous mixture.
27. The press of claim 25, wherein the press is situated between a forming section and a press section of a paper machine, the web being in direct engagement with a second wire such that the web is supported by and between said first and second wires between said load shoe and said suction roll.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI942616A FI942616A (en) | 1994-06-03 | 1994-06-03 | Paper web pre-press |
| FI942616 | 1994-06-03 | ||
| PCT/FI1995/000284 WO1995033885A1 (en) | 1994-06-03 | 1995-05-24 | Pre-press for a paper web |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2168754A1 CA2168754A1 (en) | 1995-12-14 |
| CA2168754C true CA2168754C (en) | 1999-10-26 |
Family
ID=8540844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002168754A Expired - Fee Related CA2168754C (en) | 1994-06-03 | 1995-05-24 | Pre-press for a paper web |
Country Status (10)
| Country | Link |
|---|---|
| US (2) | US5620566A (en) |
| EP (1) | EP0712455B1 (en) |
| JP (1) | JPH09505365A (en) |
| KR (1) | KR960704113A (en) |
| AT (1) | ATE207155T1 (en) |
| CA (1) | CA2168754C (en) |
| DE (1) | DE69523258T2 (en) |
| FI (1) | FI942616A (en) |
| NO (1) | NO960284L (en) |
| WO (1) | WO1995033885A1 (en) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6096169A (en) * | 1996-05-14 | 2000-08-01 | Kimberly-Clark Worldwide, Inc. | Method for making cellulosic web with reduced energy input |
| US6083346A (en) | 1996-05-14 | 2000-07-04 | Kimberly-Clark Worldwide, Inc. | Method of dewatering wet web using an integrally sealed air press |
| US6149767A (en) | 1997-10-31 | 2000-11-21 | Kimberly-Clark Worldwide, Inc. | Method for making soft tissue |
| US6143135A (en) | 1996-05-14 | 2000-11-07 | Kimberly-Clark Worldwide, Inc. | Air press for dewatering a wet web |
| DE19654200A1 (en) | 1996-12-23 | 1998-06-25 | Voith Sulzer Papiermasch Gmbh | Wet press |
| WO1998028489A1 (en) * | 1996-12-23 | 1998-07-02 | Voith Sulzer Papiermaschinen Gmbh | Wet end, method for the production of a fibrous material web and use of wet end |
| DE19702574A1 (en) * | 1997-01-24 | 1998-07-30 | Voith Sulzer Papiermasch Gmbh | Press arrangement |
| US6139691A (en) * | 1997-09-30 | 2000-10-31 | Valmet-Karlstad Ab | Shoe press |
| US6159342A (en) * | 1997-09-30 | 2000-12-12 | Valmet-Karlstad Ab | Shoe press |
| US6197154B1 (en) | 1997-10-31 | 2001-03-06 | Kimberly-Clark Worldwide, Inc. | Low density resilient webs and methods of making such webs |
| US6187137B1 (en) | 1997-10-31 | 2001-02-13 | Kimberly-Clark Worldwide, Inc. | Method of producing low density resilient webs |
| US6306257B1 (en) | 1998-06-17 | 2001-10-23 | Kimberly-Clark Worldwide, Inc. | Air press for dewatering a wet web |
| US6280573B1 (en) | 1998-08-12 | 2001-08-28 | Kimberly-Clark Worldwide, Inc. | Leakage control system for treatment of moving webs |
| US6248210B1 (en) * | 1998-11-13 | 2001-06-19 | Fort James Corporation | Method for maximizing water removal in a press nip |
| SE513299C2 (en) * | 1998-12-23 | 2000-08-21 | Skogsind Tekn Foskningsinst | Device and process for drying a fiber web |
| DE19934875A1 (en) * | 1999-07-24 | 2001-01-25 | Voith Paper Patent Gmbh | Paper machine |
| US6318727B1 (en) | 1999-11-05 | 2001-11-20 | Kimberly-Clark Worldwide, Inc. | Apparatus for maintaining a fluid seal with a moving substrate |
| DE19953474A1 (en) * | 1999-11-05 | 2001-05-10 | Voith Paper Patent Gmbh | Shoe press roller |
| AU1526401A (en) | 1999-12-03 | 2001-06-12 | Metso Paper Inc. | Method for using water hydraulics in a paper or board machine |
| FI116310B (en) * | 2000-05-10 | 2005-10-31 | Metso Paper Inc | Deflection-compensated roll for paper / board or finishing machine |
| AT412483B (en) * | 2003-03-26 | 2005-03-25 | Andritz Ag Maschf | METHOD AND DEVICE FOR MOORING FIBROUS MATERIALS |
| US7510630B2 (en) * | 2005-04-20 | 2009-03-31 | Albany International Corp. | Extended couch nip on cylinder former |
| FI121147B (en) | 2008-06-27 | 2010-07-30 | Metso Paper Inc | Pre-press, web forming part and plant for manufacturing multi-layer web |
| DE102008035540A1 (en) * | 2008-07-30 | 2010-02-04 | Voith Patent Gmbh | Press roller arrangement for use during smoothing of fibrous material webs, has supporting elements supplied with pressure fluid by hydraulic pump unit, where large part of elements is subjected with pressure by pump unit |
| SE545915C2 (en) * | 2022-03-29 | 2024-03-12 | Rise Res Institutes Of Sweden Ab | An extended nip press apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3853698A (en) * | 1972-04-17 | 1974-12-10 | Beloit Corp | Large roll hydraulic press with pressurized fluid supports |
| FI71979B (en) * | 1981-06-24 | 1986-11-28 | Escher Wyss Ag | PRESSVALS |
| FI70952C (en) * | 1982-10-14 | 1986-10-27 | Valmet Oy | ANORDNING MED LAONG PRESON VID PRESSBEHANDLING AV FIBERBANA |
| DE3408119A1 (en) * | 1984-02-06 | 1985-08-14 | Sulzer-Escher Wyss GmbH, 7980 Ravensburg | WET PRESS FOR DRAINING A FIBER TRAIN |
| CH670217A5 (en) * | 1986-06-20 | 1989-05-31 | Escher Wyss Gmbh | |
| EP0289477A3 (en) * | 1987-04-28 | 1989-03-08 | Valmet Paper Machinery Inc. | Method for hot-pressing of a paper web and a drying device for the implementation of the method |
| DE3808293C2 (en) * | 1988-03-12 | 1994-08-18 | Voith Gmbh J M | Long nip press roll |
| SE461171C (en) * | 1988-05-25 | 1992-05-15 | Valmet Paper Machinery Inc | LONG NYP PRESSES BEFORE PAPER OR CARTON MACHINERY |
| 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 |
-
1994
- 1994-06-03 FI FI942616A patent/FI942616A/en unknown
-
1995
- 1995-05-24 EP EP95920092A patent/EP0712455B1/en not_active Expired - Lifetime
- 1995-05-24 DE DE69523258T patent/DE69523258T2/en not_active Expired - Fee Related
- 1995-05-24 CA CA002168754A patent/CA2168754C/en not_active Expired - Fee Related
- 1995-05-24 AT AT95920092T patent/ATE207155T1/en not_active IP Right Cessation
- 1995-05-24 JP JP8500386A patent/JPH09505365A/en active Pending
- 1995-05-24 WO PCT/FI1995/000284 patent/WO1995033885A1/en active IP Right Grant
- 1995-06-02 US US08/459,111 patent/US5620566A/en not_active Expired - Fee Related
-
1996
- 1996-01-24 NO NO960284A patent/NO960284L/en not_active Application Discontinuation
- 1996-01-31 KR KR1019960700513A patent/KR960704113A/en not_active Application Discontinuation
- 1996-10-16 US US08/732,072 patent/US5695612A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| NO960284D0 (en) | 1996-01-24 |
| EP0712455B1 (en) | 2001-10-17 |
| FI942616A0 (en) | 1994-06-03 |
| CA2168754A1 (en) | 1995-12-14 |
| ATE207155T1 (en) | 2001-11-15 |
| KR960704113A (en) | 1996-08-31 |
| EP0712455A1 (en) | 1996-05-22 |
| NO960284L (en) | 1996-01-24 |
| WO1995033885A1 (en) | 1995-12-14 |
| JPH09505365A (en) | 1997-05-27 |
| FI942616A (en) | 1995-12-04 |
| DE69523258T2 (en) | 2002-06-27 |
| DE69523258D1 (en) | 2001-11-22 |
| US5620566A (en) | 1997-04-15 |
| US5695612A (en) | 1997-12-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |