EP0311531A1 - Cylindre de presse pour la fabrication de papier ou pâte à papier - Google Patents

Cylindre de presse pour la fabrication de papier ou pâte à papier Download PDF

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Publication number
EP0311531A1
EP0311531A1 EP88420329A EP88420329A EP0311531A1 EP 0311531 A1 EP0311531 A1 EP 0311531A1 EP 88420329 A EP88420329 A EP 88420329A EP 88420329 A EP88420329 A EP 88420329A EP 0311531 A1 EP0311531 A1 EP 0311531A1
Authority
EP
European Patent Office
Prior art keywords
holes
press cylinder
cylinder according
press
paper
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.)
Withdrawn
Application number
EP88420329A
Other languages
German (de)
English (en)
French (fr)
Inventor
Guy Dupoyet
Jean-Marc Truchot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GERLAND STOWE WOODWARD INDUSTRIES BV
Original Assignee
GERLAND STOWE WOODWARD INDUSTRIES BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GERLAND STOWE WOODWARD INDUSTRIES BV filed Critical GERLAND STOWE WOODWARD INDUSTRIES BV
Publication of EP0311531A1 publication Critical patent/EP0311531A1/fr
Withdrawn legal-status Critical Current

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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
    • D21F3/08—Pressure rolls
    • D21F3/083—Pressure rolls perforated

Definitions

  • the present invention relates to a press cylinder intended more particularly for the manufacture of paper, paper pulp or the like.
  • Such a cylinder must allow the elimination of the liquid (generally water) continuous in the paper pulp. This elimination takes place during the passage of the paper pulp, generally supported by a felt mat, between the two cylinders of the press.
  • liquid generally water
  • the cylinders generally consist of a metal body and a coating layer of a material such as elastomer, (rubber, polyurethane or other), thermoplastic or thermosetting material.
  • a material such as elastomer, (rubber, polyurethane or other), thermoplastic or thermosetting material.
  • FIG. 1 is a partial cross-sectional view of a known press cylinder
  • the holes 2 made in the coating 3 of this cylinder have a very small diameter and a great depth, ranging from two to five times the value of their diameter.
  • the object of the present invention is to remedy these drawbacks and to provide in a press cylinder of the aforementioned type a system of holes to improve the phenomenon of water evacuation by the cylinder without increasing and even reducing the phenomenon of marking of the paper.
  • the hole system according to the invention makes it possible to have much less pressure variations at the level of each hole and makes it possible to reduce, in a much more effective manner than the known systems, the phenomenon of marking. paper.
  • the holes have a profile designed so as to exert a suction cup effect on the paper pulp or the felt supporting it.
  • Such a profile makes it possible to hold the felt which supports the paper or the paper pulp, pressed against the cylinder at the outlet of the pressure zone and therefore prevents the water which has been discharged from coming out of the felt and rewetting the paper.
  • Different hole profiles can be provided so as to have better retention of felt or of water in the felt, or a better distribution of the flow.
  • Figure 2 shows a first embodiment of holes 12 made in the coating 3 of a cylinder.
  • the holes 12 have a flattened conical shape and their diameter is approximately seven times greater than their depth.
  • this embodiment makes it possible to have a much more gradual variation in pressures P over the entire surface of the cylinder because on the one hand the holes 12 are much closer together and on the other hand that their profile decreases progressively from their periphery to their center.
  • the conical shape of the holes 12 gives them a suction cup effect which keeps the felt, which supports the paper, or the paper pulp itself, pressed against the coating 3 of the cylinder at the exit of the zone. press pressure. This arrangement makes it possible to maintain inside these holes 12 the water which has been sucked in by them and prevents the latter from coming out and rewetting the paper at the outlet of the press.
  • This arrangement also makes it possible to facilitate the detachment of the felt from the sheet of paper when leaving the pressure zone since it accompanies the cylinder for part of its rotation.
  • the holes 22 simply have the shape of a cylindrical bowl with a flat bottom 22a .
  • the holes 32 also have the shape of a cylindrical bowl but having a domed bottom 32a .
  • a back pressure is obtained in the central part of the hole opposing the pressure exerted by the other press cylinder.
  • the holes can also have a profile in the shape of a spherical cap as shown at 42 in FIG. 5 , or a circular shape (holes 52 in FIG. 6) with an undercut of the edges 52a of this hole, which gives the holes 52 a dovetail profile in cross section.
  • edges 52a grip the felt and therefore make it possible to have better retention of the latter on the surface of the cylinder.
  • FIGS. 7 and 8 show a last embodiment in which the holes 62 have the shape of circular bowls having a convex bottom 62a.
  • the bottom 62a is flush with the peripheral surface of the covering 3 and defines with the edge of the hole 62 a circular groove 63.
  • This type of hole 62 can be combined with holes 65 made in the central part of their bottom 62a and which can be blind or open out inside the cylinder.
  • each hole 62 can be made so that the grooves 63 which they define overlap as shown in FIG. 8. Holes 70 can then be made at each intersection of two circular grooves 63.
  • each hole 62 is made in such a way that its bottom has a geometry delimiting an annular groove 63 whose outside diameter is greater than its depth.
  • This arrangement of the holes 62 makes it possible to break and therefore to diversify the flow of the water, and consequently makes it possible to have a better distribution and a low speed of these flows.
  • the holes 65, 70 may be blind as indicated above, or may, on the contrary, completely pass through the coating of the cylinder so as to open into the body of the latter in the case where it is a question of a suction cylinder.
  • the coating 3 has circular grooves 73 and holes 70 which are made at the intersections of these grooves 73 and a central hole 75 is provided.
  • the grooves 73 are thinner than the grooves 63 of Figures 7 and 8 and have a width less than the diameter of the holes 70.75, so as to limit the phenomenon of marking of paper or paper pulp.
  • Thin circular grooves 83 may also be provided concentric with the grooves 73. These grooves 83 may be tangent or intersect sect between them.

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  • Paper (AREA)
EP88420329A 1987-10-09 1988-10-03 Cylindre de presse pour la fabrication de papier ou pâte à papier Withdrawn EP0311531A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8714477A FR2621617A1 (fr) 1987-10-09 1987-10-09 Cylindre de presse pour la fabrication de papier ou pate a papier
FR8714477 1987-10-09

Publications (1)

Publication Number Publication Date
EP0311531A1 true EP0311531A1 (fr) 1989-04-12

Family

ID=9355989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420329A Withdrawn EP0311531A1 (fr) 1987-10-09 1988-10-03 Cylindre de presse pour la fabrication de papier ou pâte à papier

Country Status (7)

Country Link
EP (1) EP0311531A1 (no)
JP (1) JPH01221591A (no)
BR (1) BR8805202A (no)
FI (1) FI884615A (no)
FR (1) FR2621617A1 (no)
NO (1) NO884471L (no)
PT (1) PT88674A (no)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130266808A1 (en) * 2012-04-06 2013-10-10 Stowe Woodward Licensco, Llc Hydrophobic and/or amphiphobic roll cover

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009001156A1 (de) * 2009-02-25 2010-08-26 Voith Patent Gmbh Walze

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE276833C (no) *
US1428760A (en) * 1920-06-24 1922-09-12 Jr Truman Alonzo Cuish Couch roll
DE363780C (de) * 1919-08-16 1922-11-13 Karlstads Mek Verkst Ab Presswalze mit Oberflaechenkanaelen zum Auspressen von Holzstoff, Zellstoff u. dgl.
US1836243A (en) * 1928-12-20 1931-12-15 Anton J Haug Filter and press roll therefor
FR1504880A (fr) * 1965-12-11 1967-12-08 Voith Gmbh J M Presse à cylindre, en particulier presse d'une machine à papier
GB2062716A (en) * 1979-11-05 1981-05-28 Beloit Corp Wet presses

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE276833C (no) *
DE363780C (de) * 1919-08-16 1922-11-13 Karlstads Mek Verkst Ab Presswalze mit Oberflaechenkanaelen zum Auspressen von Holzstoff, Zellstoff u. dgl.
US1428760A (en) * 1920-06-24 1922-09-12 Jr Truman Alonzo Cuish Couch roll
US1836243A (en) * 1928-12-20 1931-12-15 Anton J Haug Filter and press roll therefor
FR1504880A (fr) * 1965-12-11 1967-12-08 Voith Gmbh J M Presse à cylindre, en particulier presse d'une machine à papier
GB2062716A (en) * 1979-11-05 1981-05-28 Beloit Corp Wet presses

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130266808A1 (en) * 2012-04-06 2013-10-10 Stowe Woodward Licensco, Llc Hydrophobic and/or amphiphobic roll cover
CN104334795A (zh) * 2012-04-06 2015-02-04 斯托·伍德沃德许可有限责任公司 疏水和/或双疏辊覆盖层
US10563354B2 (en) * 2012-04-06 2020-02-18 Stowe Woodward Licensco Llc Hydrophobic and/or amphiphobic roll cover

Also Published As

Publication number Publication date
FI884615A (fi) 1989-04-10
NO884471L (no) 1989-04-10
FI884615A0 (fi) 1988-10-07
FR2621617A1 (fr) 1989-04-14
JPH01221591A (ja) 1989-09-05
NO884471D0 (no) 1988-10-07
BR8805202A (pt) 1989-05-23
PT88674A (pt) 1989-07-31

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