US3549487A - Vertical shake apparatus for papermaking wire - Google Patents

Vertical shake apparatus for papermaking wire Download PDF

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US3549487A
US3549487A US608782A US3549487DA US3549487A US 3549487 A US3549487 A US 3549487A US 608782 A US608782 A US 608782A US 3549487D A US3549487D A US 3549487DA US 3549487 A US3549487 A US 3549487A
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forming medium
roll
web
projections
furnish
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US608782A
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Raymond C Clark
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Huyck Corp
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Huyck Corp
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/18Shaking apparatus for wire-cloths and associated parts

Definitions

  • an aqueous suspension of fibers such as cellulose and/ or mineral
  • the furnish is flowed onto a traveling forming medium.
  • the forming medium is a woven, screen-like structure made from metal wire and/ or synthetic filaments.
  • Various drainage or dewatering elements are disposed beneath the forming medium, such as table rolls, suction boxes, and/or hydrofoils (stationary drainage elements like that shown in U.S. Pat. No. 2,928,465).
  • the forming medium travels over the drainage elements, water is removed from the furnish producing a continuous web which is self-supporting to some extent.
  • the web is then transferred from the forming section to the press section and then the dryer section of the papermaking machine where additional operations on the web compact the web and remove still more water therefrom.
  • a horizontal mechanical shake may be imparted to a substantial part of the structure by which the forming medium is supported, and, hence to the forming medium, by suitable mechanical means.
  • This motion induces a more nearly random orientation and interweaving of the web fibers in the furnish, and produces a web having improved and more uniform strength in the cross-machine direction as well as the machine direction.
  • This oscillation or shaking of the forming medium also prevents premature formation of the bottom portion of the web, a phenomenon which reduces the rate of drainage from the furnish and prevents random movement of the fibers therein.
  • one object of the present invention is to provide means for improving the formation of a continuous web in a papermaking machine.
  • Another object of the present invention is to provide means for improving the random orientation of the fibers of a web formed on a papermaking machine.
  • Another object of the present invention is to provide means for increasing the drainage from a web formed on a papermaking machine.
  • Still another object of the present invention is to provide means for producing an effective shake of the forming medium in a fourdrinier machine.
  • an object of the present invention is to provide means for imparting a vertical shake to the forming medium in a fourdrinier papermaking machine.
  • one embodiment thereof comprises, in a papermaking machine, rotatable means for producing a vertical shaking of the forming medium.
  • the rotatable means is disposed beneath the forming medium and arranged to be in contact with the underside thereof.
  • the rotatable means comprises a cylindrical roll having at least a single projection extending from the surface thereof which intermittently engages the underside of the forming medium upon rotation of the roll, producing a vertical movement or shaking of the forming medium.
  • FIG. 1 is a simplified view of the forming section of a fourdrinier papermaking machine
  • FIG. 2 is a fragmentary view of the rotatable means for improving the formation of the web in the machine shown in FIG. 1;
  • FIG. 3 is a detailed fragmentary view of the rotatable means shown in FIG. 2;
  • FIG. 4 is a section view of an alternate construction for the rotatable means shown in FIG. 3.
  • FIG. 1 there is shown the forming section of a papermaking machine wherein a continuous web of fibrous material is being formed on a moving forming medium.
  • an endless forming medium 3 (moving from left to right as shown in the drawing) on which an aqueous suspension of fibers (such as cellulose and/ or mineral fibers) is flowed from a headbox in order to form a continuous web 5 of material such a paper, board, pulp, asbestos sheet or the like.
  • the forming medium 3 is mounted about a breast roll 7 and a couch roll 9 and is generally a woven endless belt of all metal composition, all synthetic composition such as shown in U.S. Pat. #2,903,021Holden et al., a combination of metal and synthetic materials, or
  • Patented Dec. 22, 1970 3 other suitable material such as a sheet of perforated metal or plastic.
  • the aqueous suspension, or furnish as it is commonly called is dewatered in order to remove much of the water content therefrom and to form a somewhat self-supporting web. Drainage or other suitable dewatering means aid in the removal of the water.
  • table rolls 13, stationary foil elements 15, and/ or suction boxes 17 are disposed beneath the forming medium and in contact with the underside thereof, the operation of each of such devices being well known in the art.
  • Rotatable means 19 are provided for imparting a vertical movement or shaking motion to the forming medium 3 in order to thoroughly criss-cross and interweave the Web fibers while the furnish is sill in a somewhat aqueous condition.
  • the rotatable means 19 are disposed beneath the forming medium 3 and arranged so as to contact the underside thereof.
  • the rotatable means 19 comprises a generally cylindrical roll 21 having at least a single projection 23 extending therefrom.
  • the roll 21 will have many projections 23 extending therefrom with the projections 23 engaging the underside of 'the forming medium 3.
  • a vertical movement or shaking motion is imparted to the forming medium 3.
  • the rotatable means 19 may be rotatably afiixed to the frame (not shown) of the fourdinier machine in any suitable manner. As such afiixing means are well known in the prior art, no further explanation thereof is deemed necessary.
  • projections 23 may extend from the roll 21, it should be noted that for optimum spacing of the projections 23, they are arranged in parallel rows which extend across the roll 21, the spacing between rows being such that a straight edge resting on projections in adjacent rows would just be tangent to the roll surface.
  • the forming medium 3 is forced away from the rotating roll surface, a slight vacuum is created which aids in the dewatering of the web 5.
  • the roll acts as a common table roll. As such, it may be desirable to provide existing table rolls with projections 23 in order to achieve the beneficial results of the present invention.
  • the projections may comprise integral button-like elements which may be formed integral with the roll such as by casting the whole structure (roll and projections together) in a suitable mold; or, and referring now to FIG. 4, the button-like projections 23 may comprise an insert 24 which is fitted within a corresponding hole or opening 25 in the cylindrical roll 21, each hole 25 being adapted to receive and hold a single insert 24.
  • each insert 24 includes a head portion 29 and a stern portion 31; the stem portion 31 fitting within the receiving hole 25 and the head portion 29 being adapted to engage the underside of the forming medium 3.
  • the stem portion 31 may be held in the hole 25 either by frictional engagement with the wall of the hole or by the use of a suitable adhesive or the like.
  • the head portion 29 of the insert 24 is generally semispherical or at least arcuate in configuration.
  • the integral button-like projections will also be of an arcuate configuration.
  • it is not the intention of the present invention to be limited to such a configuration as such configuration is given by way of exmaple only. It should be noted, however, that the configuration used should not be so sharp as to cause damage to the forming medium 3.
  • the roll 21 and projections 23 be of a rugged, wear-resistane and durable construction. As such, they may be formed of stainless steel, hard rubber or any other suitable material. When the projections 23 are formed integral with the roll 21, they will in most instances be formed of the same material as the roll. However, when the roll 21 as shown in FIG. 4 is utilized, the inserts 24 may be either of the same material as the roll or of a different material. That is, stainless steel projections could be used with a hard rubber roll or a stainless steel roll could be used with hard rubber projections. Note that other materials could also be used and stainless steel and hard rubber are given by way of example only.

Description

ec. 22, 1970 R. c. CLARK 3,549,487
' VERTICAL SHAKE mun/mus FOR PAPERMAKING WIRE Filed Jan. 12, 1967 IN VEN TOR.
United States Patent O 3,549,487 VERTICAL SHAKE APPARATUS FOR PAPERMAKIN G WIRE Raymond C. Clark, Orange, Conn., assignor to Huyck Corporation, Rensselaer, N.Y., a corporation of New York Filed Jan. 12, 1967, Ser. No. 608,782 Int. Cl. D21f 1/20 U.S. Cl. 162-356 4 Claims ABSTRACT OF THE DISCLOSURE Thi invention relates to means for improving the formation of a continuous web in a papermaking machine, and more specifically, to means for imparting vertical shaking movement to the forming medium in the forming section of a fourdrinier papermaking machine.
BACKGROUND OF THE INVENTION In the typical fourdrinier papermaking machine, which may be used for the production of paper, board, pulp, asbestos sheet and/ or other continuous web-like structures, an aqueous suspension of fibers (such as cellulose and/ or mineral), called the furnish, is flowed onto a traveling forming medium. Typically, the forming medium is a woven, screen-like structure made from metal wire and/ or synthetic filaments. Various drainage or dewatering elements are disposed beneath the forming medium, such as table rolls, suction boxes, and/or hydrofoils (stationary drainage elements like that shown in U.S. Pat. No. 2,928,465). As the forming medium travels over the drainage elements, water is removed from the furnish producing a continuous web which is self-supporting to some extent. The web is then transferred from the forming section to the press section and then the dryer section of the papermaking machine where additional operations on the web compact the web and remove still more water therefrom.
In order to aid the formation of the web, whether it be paper, board, pulp or sheet, a horizontal mechanical shake may be imparted to a substantial part of the structure by which the forming medium is supported, and, hence to the forming medium, by suitable mechanical means. This motion induces a more nearly random orientation and interweaving of the web fibers in the furnish, and produces a web having improved and more uniform strength in the cross-machine direction as well as the machine direction. This oscillation or shaking of the forming medium also prevents premature formation of the bottom portion of the web, a phenomenon which reduces the rate of drainage from the furnish and prevents random movement of the fibers therein.
However, as the speed of the papermaking machine increases it becomes increasingly difiicult to produce an effective oscillation of the furnish and/ or forming medium, one reason being that at the higher operating speeds of the machine, the furnish spends only a very short period of time on the forming medium. Since the frequency of oscillation of the forming medium is limited by design and/or practical considerations, such as splashing of the furnish at the deckel straps, no effective oscillation of the furnish will occur at high speed operation of the machine. Further, in order to produce effective oscillations of the ever-increasing widths of the ice forming medium, complex machinery is required resulting in a high operating cost. As such, means should be provided for producing an effective oscillation of the furnish and/or forming medium in order to improve the formation of the web.
Therefore, one object of the present invention is to provide means for improving the formation of a continuous web in a papermaking machine.
Another object of the present invention is to provide means for improving the random orientation of the fibers of a web formed on a papermaking machine.
Another object of the present invention is to provide means for increasing the drainage from a web formed on a papermaking machine.
Still another object of the present invention is to provide means for producing an effective shake of the forming medium in a fourdrinier machine.
Still further, an object of the present invention is to provide means for imparting a vertical shake to the forming medium in a fourdrinier papermaking machine.
SUMMARY OF THE INVENTION In accordance with the principles of the present invention, one embodiment thereof comprises, in a papermaking machine, rotatable means for producing a vertical shaking of the forming medium. The rotatable means is disposed beneath the forming medium and arranged to be in contact with the underside thereof. The rotatable means comprises a cylindrical roll having at least a single projection extending from the surface thereof which intermittently engages the underside of the forming medium upon rotation of the roll, producing a vertical movement or shaking of the forming medium.
BRIEF DESCRIPTION OF THE DRAWING Additional objects and advantages of the present invention together with a better understanding thereof may be had by referring to the following detailed description of the present invention together with the accompanying drawings, in which:
FIG. 1 is a simplified view of the forming section of a fourdrinier papermaking machine;
FIG. 2 is a fragmentary view of the rotatable means for improving the formation of the web in the machine shown in FIG. 1;
FIG. 3 is a detailed fragmentary view of the rotatable means shown in FIG. 2; and
FIG. 4 is a section view of an alternate construction for the rotatable means shown in FIG. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENT Turning now to FIG. 1 there is shown the forming section of a papermaking machine wherein a continuous web of fibrous material is being formed on a moving forming medium. Specifically, there is shown an endless forming medium 3 (moving from left to right as shown in the drawing) on which an aqueous suspension of fibers (such as cellulose and/ or mineral fibers) is flowed from a headbox in order to form a continuous web 5 of material such a paper, board, pulp, asbestos sheet or the like. The forming medium 3 is mounted about a breast roll 7 and a couch roll 9 and is generally a woven endless belt of all metal composition, all synthetic composition such as shown in U.S. Pat. #2,903,021Holden et al., a combination of metal and synthetic materials, or
Patented Dec. 22, 1970 3 other suitable material such as a sheet of perforated metal or plastic.
After being deposited on the forming medium 3, the aqueous suspension, or furnish as it is commonly called, is dewatered in order to remove much of the water content therefrom and to form a somewhat self-supporting web. Drainage or other suitable dewatering means aid in the removal of the water. As such, table rolls 13, stationary foil elements 15, and/ or suction boxes 17 are disposed beneath the forming medium and in contact with the underside thereof, the operation of each of such devices being well known in the art.
As previously mentioned, in order to produce a Web having uniform strength in both the machine and crossmachine directions, it is necessary that the individual fibers of the web be thoroughly criss-crossed and interwoven while the web is being formed. That is, the fibers must be oriented in a random array while the furnish is still in a somewhat aqueous condition and before substantial amounts of water are removed therefrom. Rotatable means 19 are provided for imparting a vertical movement or shaking motion to the forming medium 3 in order to thoroughly criss-cross and interweave the Web fibers while the furnish is sill in a somewhat aqueous condition. The rotatable means 19 are disposed beneath the forming medium 3 and arranged so as to contact the underside thereof.
It can be seen (FIG. 2) that the rotatable means 19 comprises a generally cylindrical roll 21 having at least a single projection 23 extending therefrom. Preferably, the roll 21 will have many projections 23 extending therefrom with the projections 23 engaging the underside of 'the forming medium 3. Upon rotation of the cylindrical roll 21, (either by independent drive means or by motion imparted to the roll through frictional engagement of it with the moving forming medium), a vertical movement or shaking motion is imparted to the forming medium 3. It should be noted that the rotatable means 19 may be rotatably afiixed to the frame (not shown) of the fourdinier machine in any suitable manner. As such afiixing means are well known in the prior art, no further explanation thereof is deemed necessary.
While many or few projections 23 may extend from the roll 21, it should be noted that for optimum spacing of the projections 23, they are arranged in parallel rows which extend across the roll 21, the spacing between rows being such that a straight edge resting on projections in adjacent rows would just be tangent to the roll surface.
In the operation of a papermaking machine incorporating such a roll, rotation of the roll 21 will cause the projections 23 on the roll to engage intermittently the underside of the moving forming medium 3 and thereby impart to the forming medium 3 a vertical displacement from the roll surface 21. Appropriate spacing of the projections 23 will provide a predetermined amount of vertical movement or oscillation of the forming medium 3 and furnish thereon for a given roll speed, which, in turn, Will produce random orientation of the web fibers.
It should be noted that as the forming medium 3 is forced away from the rotating roll surface, a slight vacuum is created which aids in the dewatering of the web 5. However, when the forming medium 3 is in contact with the surface of the roll, the roll acts as a common table roll. As such, it may be desirable to provide existing table rolls with projections 23 in order to achieve the beneficial results of the present invention.
In order to avoid marking of the formed web 5, it is preferred to utilize a plurality of these knobbed rolls in a papermaking machine. As seen in FIG. 3, the projectionsmay comprise integral button-like elements which may be formed integral with the roll such as by casting the whole structure (roll and projections together) in a suitable mold; or, and referring now to FIG. 4, the button-like projections 23 may comprise an insert 24 which is fitted within a corresponding hole or opening 25 in the cylindrical roll 21, each hole 25 being adapted to receive and hold a single insert 24. In the latter instance, each insert 24 includes a head portion 29 and a stern portion 31; the stem portion 31 fitting within the receiving hole 25 and the head portion 29 being adapted to engage the underside of the forming medium 3. The stem portion 31 may be held in the hole 25 either by frictional engagement with the wall of the hole or by the use of a suitable adhesive or the like.
Peferably, the head portion 29 of the insert 24 is generally semispherical or at least arcuate in configuration. Similarly, the integral button-like projections will also be of an arcuate configuration. However, it is not the intention of the present invention to be limited to such a configuration as such configuration is given by way of exmaple only. It should be noted, however, that the configuration used should not be so sharp as to cause damage to the forming medium 3.
Since the roll 21 will be in contact with the moving forming medium 3, it is generally desirable that the roll 21 and projections 23 be of a rugged, wear-resistane and durable construction. As such, they may be formed of stainless steel, hard rubber or any other suitable material. When the projections 23 are formed integral with the roll 21, they will in most instances be formed of the same material as the roll. However, when the roll 21 as shown in FIG. 4 is utilized, the inserts 24 may be either of the same material as the roll or of a different material. That is, stainless steel projections could be used with a hard rubber roll or a stainless steel roll could be used with hard rubber projections. Note that other materials could also be used and stainless steel and hard rubber are given by way of example only.
Again, it is not the intention of the present invention to be limited to the use of a single insert 24 fitting within a corresponding hole 25, and a plurality of inserts 24 may be fitted with a corresponding plurality of holes 25.
Thus, it can be seen that even with the tendency to operate papermaking machines at higher speeds, and to increase the width of such machines, it is still possible to produce an effective shaking of the deposited suspension so that the web fibers will be randomly arrayed in the formed web. Further, paper, paper-like sheets, board, pulp, asbestos sheet, and any other similar fibrous formation may be made in the previously mentioned manner.
While I have shown and described only particular embodiments of the present invention, it will become obvious to those skilled in the art that additional changes and modifications may be made without departing from the present invention in its broader aspect. Therefore, it is the intention of the appended claims to cover all such changes and modifications as fall within the true spirit and scope of the present invention.
What I claim as new and novel and desire to secure by Letters Patent of the United States is:
1. In the forming section of a papermaking machine wherein a continuous web of fibrous material is formed from an aqueous suspension deposited on a moving form ing medium; the improvement comprising rotatable means disposed beneath the forming medium and in engagement with the underside thereof, said means having a multiplicity of knob-like projections on the surface thereof for selectively imparting intermittent vertical displacement to said forming medium in those regions in contact with said projection.
2. Apparatus as described in claim 1 wherein said projections are of a substantially arcuate configuration.
3. In the forming section of a fourdrinier machine adapted to produce a continuous fibrous web; comprising a moving forming medium on which the continuous web is formed, the improvement comprising rotatable means dsposed beneath said forming medium and in engagement with the underside thereof, said means having at least one knob-like projection from the surface thereof for selectively imparting vertical displacement to said 5 6 forming medium the region of contact with said pro- FOREIGN PATENTS lectlons- 187,711 3/1906 Germany 162356 4. Apparatus as described in claim 3 wherein said projections are substantially arcuate in shape.
S. LEON BASHORE, Primary Examiner References Cit d 5 F. FREI, Assistant Examiner UNITED STATES PATENTS US Cl 1,536,599 5/1925 Aldrich 162-356 162-209 1,917,098 7/1933 Cofrin 162355X 2,092,798 9/1937 Charlton 162-356 l0
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4137159A (en) * 1977-04-30 1979-01-30 Vernon D. Beehler Apparatus and method for deliquifying material
US4243482A (en) * 1978-11-27 1981-01-06 Seppanen Erkki O Forming paper using a curved fin to facilitate web transfer
US4999086A (en) * 1989-08-04 1991-03-12 Marx Jr Edmund N Dispersion roll in a fourdrinier machine
WO1997030213A1 (en) * 1996-02-13 1997-08-21 Thermo Fibertek Inc. Vacuum isolated dewatering method and unit
DE10109413A1 (en) * 2001-02-27 2002-09-05 Voith Paper Patent Gmbh Method and device for improving the properties of a fibrous web produced in a sheet-forming device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE187711C (en) *
US1536599A (en) * 1922-10-18 1925-05-05 Aldrich Alonzo Paper-making machine
US1917098A (en) * 1932-02-02 1933-07-04 Austin E Cofrin Apparatus and process for making paper
US2092798A (en) * 1934-12-17 1937-09-14 Int Paper Co Process and apparatus for the manufacture of paper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE187711C (en) *
US1536599A (en) * 1922-10-18 1925-05-05 Aldrich Alonzo Paper-making machine
US1917098A (en) * 1932-02-02 1933-07-04 Austin E Cofrin Apparatus and process for making paper
US2092798A (en) * 1934-12-17 1937-09-14 Int Paper Co Process and apparatus for the manufacture of paper

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4137159A (en) * 1977-04-30 1979-01-30 Vernon D. Beehler Apparatus and method for deliquifying material
US4243482A (en) * 1978-11-27 1981-01-06 Seppanen Erkki O Forming paper using a curved fin to facilitate web transfer
US4999086A (en) * 1989-08-04 1991-03-12 Marx Jr Edmund N Dispersion roll in a fourdrinier machine
WO1997030213A1 (en) * 1996-02-13 1997-08-21 Thermo Fibertek Inc. Vacuum isolated dewatering method and unit
DE10109413A1 (en) * 2001-02-27 2002-09-05 Voith Paper Patent Gmbh Method and device for improving the properties of a fibrous web produced in a sheet-forming device

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Owner name: HUYCK CORPORATION A CORP. OF NY.

Free format text: MERGER;ASSIGNOR:HUYCK CORPORATION (MERGED INTO) BTR FABRICS (USA) AND CHANGED INTO;REEL/FRAME:003927/0115

Effective date: 19810630