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EP0284575B1 - Toile d'égouttage pour la formation d'une bande de papier - Google Patents

Toile d'égouttage pour la formation d'une bande de papier Download PDF

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Publication number
EP0284575B1
EP0284575B1 EP88850058A EP88850058A EP0284575B1 EP 0284575 B1 EP0284575 B1 EP 0284575B1 EP 88850058 A EP88850058 A EP 88850058A EP 88850058 A EP88850058 A EP 88850058A EP 0284575 B1 EP0284575 B1 EP 0284575B1
Authority
EP
European Patent Office
Prior art keywords
forming
fabric
strands
medium
machine direction
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
Application number
EP88850058A
Other languages
German (de)
English (en)
Other versions
EP0284575A1 (fr
Inventor
Cai Olof Hellner
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.)
Nordiskafilt AB
Original Assignee
Nordiskafilt AB
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 Nordiskafilt AB filed Critical Nordiskafilt AB
Priority to AT88850058T priority Critical patent/ATE64964T1/de
Publication of EP0284575A1 publication Critical patent/EP0284575A1/fr
Application granted granted Critical
Publication of EP0284575B1 publication Critical patent/EP0284575B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths

Definitions

  • the subject invention concerns a multi-layer dewatering medium for forming paper sheets.
  • Each layer of the medium comprises polymer material strands at least in the machine direction. These strands may consist of interwoven thread material but could also be extruded strands alone or combined with woven thread materials.
  • the conventional and most common technique involves discharging an acqueous suspension of cellulose fibers onto a forming fabric which travels horizontally and in a flat condition during the forming phase proper.
  • the water flows through the forming fabric and the restricted mesh size of the fabric prevents the fiber material from penetrating into and through the forming fabric.
  • the fibers remain on the surface of the fabric, evenly distributed thereon, whereas the dewatering elements, such as suction boxes and foils, facilitate the water through-flow.
  • the fibers At the end of the flat, horizontal part of the forming fabric loop the fibers have formed a continuous fibrous web.
  • This type of forming is generally referred to as Fourdrinier forming.
  • a jet of fibrous suspension is discharged into the gap between two moving forming elements at least one of which consists of a forming fabric.
  • the water is removed by the forming elements whereas the fiber material is retained by said elements.
  • This type of formation is generally referred to as twin wire forming.
  • multilayer forming fabrics are generally used as the forming elements.
  • the stability of multi-layer forming fabrics is largely superior to that of single-layer fabrics and particularly in Fourdrinier machines it is desirable to be able to combine a fine-mesh forming surface layer with a bottom surface layer having sufficient wearability. These properties are difficult to combine in a single-layer fabric.
  • the layer closest to the material to be formed could be made from a fine-diameter thread material, resulting in a fine mesh density whereas the layer closest to the dewatering elements may be made from a coarser and thus more abrasion-resistant material.
  • EP 0 046 899 discloses a double-layer forming fabric the weft layer or transverse layer of which forms the outer layer which is in contact with the dewatering elements.
  • the technique of designing and constructing multi-layer fabrics has always resided in exposing the transverse weft threads on the rear face to the abrasive effects.
  • the purpose of the lengthwise threads is to absorb the wire tension and for this reason these threads may be worn only to a limited degree.
  • abrasion of the transverse threads may continue until close to the wear-through point of these threads before the fabric is considered to be worn out. This is the reason why all modern forming fabrics are manufactured with transverse bottom threads serving as the abrasive medium.
  • Identical structures have also been used in the twin-wire forming method although in this case the abrasion is not quite so strong.
  • the dewatering medium for forming paper sheets in accordance with the subject invention is of multi-layer type and consists of strands of polymeric material, which medium has on its one side a first surface constituting the forming surface of the medium, which surface in position of use of the medium faces the material to be formed, and on its opposite side a second surface.
  • the dewatering medium is characterized therein that at least in the machine direction the layer closest to the second surface is made up from strands, that in the machine direction continuous or discontinuous lengths (floats) of said strands abut on said second surface, that the longest ones of said lengths of strands in the machine direction are longer than discontinuous lengths (floats) of strands which are repeated in the cross-machine direction and which abut on said second face of the medium.
  • Fig. 1 illustrates a twin-wire machine 11 of roll-former type.
  • the fiber stock is discharged into the gap between the upper fabric 13 and the bottom fabric 14.
  • the fabrics 13 and 14 with the fiber stock between them is carried over part of the cylinder face of a forming roller 15 for removal of the water through the bottom fabric 14 down into the vat 16.
  • the moist paper sheet still positioned intermediate the two fabrics, is then carried to a separation roller 17.
  • a bottom fabric 14 of a conventional type this system operates without problem up to a certain speed limit. At higher speeds, however, a certain amount of water accompanies the fabric up to the separation roller 17.
  • the forming medium in the form of the forming fabric 30 shown in Fig. 3 consists of one system of threads 32 which extend at right angles to the direction of travel 31 of the fabric and which threads 32 abut on the first surface 33 of the fabric facing the paper web.
  • a second, system of cross-machine direction threads 34 extend in parallel with the system of threads 32 and abut on the second surface 35 of the fabric.
  • a third system of threads 36 extend in the machine direction 31 and at right angles to the systems of cross-machine direction threads 32 and 34, interconnecting the latter in to a weave and alternately running between the first surface 33 facing the paper web and the second surface 35 facing in the opposite direction.
  • each machine-direction thread 36 extends externally across four consecutive cross-machine direction threads 34, forming discontinuous strand lengths (floats) 37 in the machine direction of the forming medium.
  • Each cross-machine direction thread 34 extends externally across one or two machine-direction threads 36, forming discontinuous short strand lengths 38 and slightly longer strand lengths 39 in the cross-machine direction of the forming fabric.
  • the forming fabric 40 comprises a system of cross-machine directions threads 42 which extend at right angles to the direction of travel 41 of the fabric and which system of threads abut on the first surface 43 of the fabric which faces the paper web being formed.
  • a second system of cross-machine direction threads 44 extend in parallel with the first system of threads 42 and abut on the second surface 45 of the wire.
  • the forming fabric also comprises two systems of threads 46 and 47 which extend in the lengthwise direction of the machine.
  • the system of threads 46 faces the first surface 43 of the fabric and the system of threads 47 faces the second fabric surface 45.
  • FIG. 6 illustrates the layer of threads which abut on the second surface 45 of the fabric.
  • Each machine-direction thread 47 extends externally across three consecutive cross-machine direction threads 44, forming discontinuous lengths (floats) of strands 48 in the machine direction 41 of the forming fabric.
  • Each cross-machine direction thread 44 extends externally across only one machine-direction thread 47, forming discontinuous strand lengths (floats) 49 in the cross-machine direction of the forming medium.
  • FIG. 7 A further embodiment is illustrated in Fig. 7.
  • the forming medium 50 shown in this drawing figure consists of a weave 51 comprising machine direction threads 52 and cross-machine direction threads 53 which, when interwoven, make up the first forming fabric surface 54 which faces the paper web.
  • the other side of the fabric exhibits continuous strands 55 which are extruded in the machine direction and which abut on the second surface 56 of the medium.
  • These continuous lengthwise strands may be interconnected by means of transversely extending interconnection strands 57.
  • the invention is not limited to the embodiments which are illustrated and described herein but a number of modifications are possible within the scope of the appended claims.
  • the invention is applicable to other types of dewatering media than weaves, e.g. to a structure comprising a perforated foil and underlying strands.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Laminated Bodies (AREA)

Claims (3)

1. Milieu de drainage multi-couches (30, 40, 50) pour la formation de rames de papier, ce milieu comportant des chaînes en un matériau polymère et présentant sur l'un de ses côtés une première surface (33, 43, 53) qui constitue la surface de formation du milieu et se trouve vis-à-vis du matériau à former lorsque le milieu est dans sa position d'utilisation, et sur son côté opposé une deuxième surface (35, 45, 56), caractérisé en ce qu'au moins dans la direction (31) de la machine la couche la plus proche de la deuxième surface (35, 45, 56) est faite de chaînes, en ce que dans la direction de la machine des longueurs continues ou discontinues de ces chaînes (flottes) vont jusqu'à la deuxième surface (35, 45, 56), en ce que les plus longues de ces chaînes (flottes) (37, 38) sont plus longues dans la direction de la machine que des longueurs (flottes) (39, 41) discontinues de chaînes (34, 44) qui se répètent transversalement à la direction de la machine et vont jusqu'à la deuxième surface (35, 45, 56).
2. Milieu de drainage multi-couches selon la revendication 1, caractérisé en ce que les chaînes en matériau polymère sont en matériau filiforme.
3. Milieu de drainage multi-couches selon la revendication 1, caractérisé en ce que les chaînes en matériau polymère sont des chaînes extrudées.
EP88850058A 1987-03-24 1988-02-22 Toile d'égouttage pour la formation d'une bande de papier Expired - Lifetime EP0284575B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88850058T ATE64964T1 (de) 1987-03-24 1988-02-22 Entwaesserungsgewebe zur bildung einer papierbahn.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8701205 1987-03-24
SE8701205A SE460125B (sv) 1987-03-24 1987-03-24 Flerlagrat avvattningsband foer formering av pappersark

Publications (2)

Publication Number Publication Date
EP0284575A1 EP0284575A1 (fr) 1988-09-28
EP0284575B1 true EP0284575B1 (fr) 1991-07-03

Family

ID=20367951

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88850058A Expired - Lifetime EP0284575B1 (fr) 1987-03-24 1988-02-22 Toile d'égouttage pour la formation d'une bande de papier

Country Status (12)

Country Link
EP (1) EP0284575B1 (fr)
JP (1) JPS63295787A (fr)
AT (1) ATE64964T1 (fr)
AU (1) AU612138B2 (fr)
BR (1) BR8801159A (fr)
CA (1) CA1326609C (fr)
DE (1) DE3863453D1 (fr)
ES (1) ES2023015B3 (fr)
FI (1) FI90361C (fr)
MX (1) MX168766B (fr)
NO (1) NO168840C (fr)
SE (1) SE460125B (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6745797B2 (en) 2001-06-21 2004-06-08 Weavexx Corporation Papermaker's forming fabric
US6837277B2 (en) 2003-01-30 2005-01-04 Weavexx Corporation Papermaker's forming fabric
US6860969B2 (en) 2003-01-30 2005-03-01 Weavexx Corporation Papermaker's forming fabric
US6896009B2 (en) 2003-03-19 2005-05-24 Weavexx Corporation Machine direction yarn stitched triple layer papermaker's forming fabrics
US7059357B2 (en) 2003-03-19 2006-06-13 Weavexx Corporation Warp-stitched multilayer papermaker's fabrics
US7195040B2 (en) 2005-02-18 2007-03-27 Weavexx Corporation Papermaker's forming fabric with machine direction stitching yarns that form machine side knuckles
US7219701B2 (en) 2005-09-27 2007-05-22 Weavexx Corporation Papermaker's forming fabric with machine direction stitching yarns that form machine side knuckles
US7243687B2 (en) 2004-06-07 2007-07-17 Weavexx Corporation Papermaker's forming fabric with twice as many bottom MD yarns as top MD yarns
US7275566B2 (en) 2006-02-27 2007-10-02 Weavexx Corporation Warped stitched papermaker's forming fabric with fewer effective top MD yarns than bottom MD yarns
US7484538B2 (en) 2005-09-22 2009-02-03 Weavexx Corporation Papermaker's triple layer forming fabric with non-uniform top CMD floats
US7487805B2 (en) 2007-01-31 2009-02-10 Weavexx Corporation Papermaker's forming fabric with cross-direction yarn stitching and ratio of top machined direction yarns to bottom machine direction yarns of less than 1
US7580229B2 (en) 2006-04-27 2009-08-25 Hitachi Global Storage Technologies Netherlands B.V. Current-perpendicular-to-the-plane (CPP) magnetoresistive sensor with antiparallel-free layer structure and low current-induced noise
US7624766B2 (en) 2007-03-16 2009-12-01 Weavexx Corporation Warped stitched papermaker's forming fabric
US7766053B2 (en) 2008-10-31 2010-08-03 Weavexx Corporation Multi-layer papermaker's forming fabric with alternating paired and single top CMD yarns
US7931051B2 (en) 2008-01-23 2011-04-26 Weavexx Corporation Multi-layer papermaker's forming fabric with long machine side MD floats
US8251103B2 (en) 2009-11-04 2012-08-28 Weavexx Corporation Papermaker's forming fabric with engineered drainage channels

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5360518A (en) * 1991-12-18 1994-11-01 Albany International Corp. Press fabrics for paper machines
US5518042A (en) * 1994-09-16 1996-05-21 Huyck Licensco, Inc. Papermaker's forming fabric with additional cross machine direction locator and fiber supporting yarns
US5709250A (en) * 1994-09-16 1998-01-20 Weavexx Corporation Papermakers' forming fabric having additional fiber support yarns
US5983953A (en) * 1994-09-16 1999-11-16 Weavexx Corporation Paper forming progess
US5937914A (en) * 1997-02-20 1999-08-17 Weavexx Corporation Papermaker's fabric with auxiliary yarns
US5967195A (en) * 1997-08-01 1999-10-19 Weavexx Corporation Multi-layer forming fabric with stitching yarn pairs integrated into papermaking surface
US6112774A (en) * 1998-06-02 2000-09-05 Weavexx Corporation Double layer papermaker's forming fabric with reduced twinning.
DE19859581A1 (de) * 1998-12-22 2000-06-29 Voith Fabrics Heidenheim Gmbh Mehrlagiges Papiermaschinensieb zur Entwässerung und Blattbildung
US6179013B1 (en) 1999-10-21 2001-01-30 Weavexx Corporation Low caliper multi-layer forming fabrics with machine side cross machine direction yarns having a flattened cross section
US6123116A (en) * 1999-10-21 2000-09-26 Weavexx Corporation Low caliper mechanically stable multi-layer papermaker's fabrics with paired machine side cross machine direction yarns
US6585006B1 (en) 2000-02-10 2003-07-01 Weavexx Corporation Papermaker's forming fabric with companion yarns
US6244306B1 (en) 2000-05-26 2001-06-12 Weavexx Corporation Papermaker's forming fabric
US6253796B1 (en) 2000-07-28 2001-07-03 Weavexx Corporation Papermaker's forming fabric
AU2005274086A1 (en) * 2004-08-04 2006-02-23 Albany International Corp. Warp-runner triple layer fabric with paired intrinsic warp binders

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE533696A (fr) *
US4423755A (en) * 1982-01-22 1984-01-03 Huyck Corporation Papermakers' fabric
US5114777B2 (en) * 1985-08-05 1997-11-18 Wangner Systems Corp Woven multilayer papermaking fabric having increased stability and permeability and method
DE8522823U1 (de) * 1985-08-08 1986-12-11 Birke, Josef, 6780 Pirmasens Brandsohlenloser Schuh
JPS6359111A (ja) * 1986-08-29 1988-03-15 Hitachi Ltd コンパレ−タとｄ／ａ変換器

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6745797B2 (en) 2001-06-21 2004-06-08 Weavexx Corporation Papermaker's forming fabric
US6837277B2 (en) 2003-01-30 2005-01-04 Weavexx Corporation Papermaker's forming fabric
US6860969B2 (en) 2003-01-30 2005-03-01 Weavexx Corporation Papermaker's forming fabric
US6896009B2 (en) 2003-03-19 2005-05-24 Weavexx Corporation Machine direction yarn stitched triple layer papermaker's forming fabrics
US6959737B2 (en) 2003-03-19 2005-11-01 Weavexx Corporation Machine direction yarn stitched triple layer papermaker's forming fabrics
US7059357B2 (en) 2003-03-19 2006-06-13 Weavexx Corporation Warp-stitched multilayer papermaker's fabrics
US7441566B2 (en) 2003-03-19 2008-10-28 Weavexx Corporation Machine direction yarn stitched triple layer papermaker's forming fabrics
US7243687B2 (en) 2004-06-07 2007-07-17 Weavexx Corporation Papermaker's forming fabric with twice as many bottom MD yarns as top MD yarns
US7195040B2 (en) 2005-02-18 2007-03-27 Weavexx Corporation Papermaker's forming fabric with machine direction stitching yarns that form machine side knuckles
US7484538B2 (en) 2005-09-22 2009-02-03 Weavexx Corporation Papermaker's triple layer forming fabric with non-uniform top CMD floats
US7219701B2 (en) 2005-09-27 2007-05-22 Weavexx Corporation Papermaker's forming fabric with machine direction stitching yarns that form machine side knuckles
US7275566B2 (en) 2006-02-27 2007-10-02 Weavexx Corporation Warped stitched papermaker's forming fabric with fewer effective top MD yarns than bottom MD yarns
US7580229B2 (en) 2006-04-27 2009-08-25 Hitachi Global Storage Technologies Netherlands B.V. Current-perpendicular-to-the-plane (CPP) magnetoresistive sensor with antiparallel-free layer structure and low current-induced noise
US7487805B2 (en) 2007-01-31 2009-02-10 Weavexx Corporation Papermaker's forming fabric with cross-direction yarn stitching and ratio of top machined direction yarns to bottom machine direction yarns of less than 1
US7624766B2 (en) 2007-03-16 2009-12-01 Weavexx Corporation Warped stitched papermaker's forming fabric
US7931051B2 (en) 2008-01-23 2011-04-26 Weavexx Corporation Multi-layer papermaker's forming fabric with long machine side MD floats
US7766053B2 (en) 2008-10-31 2010-08-03 Weavexx Corporation Multi-layer papermaker's forming fabric with alternating paired and single top CMD yarns
US8251103B2 (en) 2009-11-04 2012-08-28 Weavexx Corporation Papermaker's forming fabric with engineered drainage channels

Also Published As

Publication number Publication date
JPS63295787A (ja) 1988-12-02
DE3863453D1 (de) 1991-08-08
FI881285A0 (fi) 1988-03-18
SE8701205L (sv) 1988-09-25
AU1358788A (en) 1988-09-22
FI881285L (fi) 1988-09-25
CA1326609C (fr) 1994-02-01
EP0284575A1 (fr) 1988-09-28
AU612138B2 (en) 1991-07-04
BR8801159A (pt) 1988-10-18
NO168840B (no) 1991-12-30
ATE64964T1 (de) 1991-07-15
NO881141L (no) 1988-09-26
NO881141D0 (no) 1988-03-15
SE460125B (sv) 1989-09-11
FI90361C (fi) 1994-01-25
MX168766B (es) 1993-06-07
NO168840C (no) 1992-04-08
SE8701205D0 (sv) 1987-03-24
FI90361B (fi) 1993-10-15
ES2023015B3 (es) 1991-12-16

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