WO1999014426A1 - Ameliorations relatives aux courroies de presse avec zone de pression etendue - Google Patents

Ameliorations relatives aux courroies de presse avec zone de pression etendue Download PDF

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Publication number
WO1999014426A1
WO1999014426A1 PCT/GB1998/002735 GB9802735W WO9914426A1 WO 1999014426 A1 WO1999014426 A1 WO 1999014426A1 GB 9802735 W GB9802735 W GB 9802735W WO 9914426 A1 WO9914426 A1 WO 9914426A1
Authority
WO
WIPO (PCT)
Prior art keywords
strips
reinforcing
press belt
membrane
matrix
Prior art date
Application number
PCT/GB1998/002735
Other languages
English (en)
Inventor
Ian Christison Sayers
John Jeffery
Original Assignee
Scapa Group Plc
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 Scapa Group Plc filed Critical Scapa Group Plc
Priority to CA002304072A priority Critical patent/CA2304072A1/fr
Priority to DE69805532T priority patent/DE69805532T2/de
Priority to AT98942876T priority patent/ATE217924T1/de
Priority to JP2000511954A priority patent/JP2001516820A/ja
Priority to EP98942876A priority patent/EP1015688B1/fr
Publication of WO1999014426A1 publication Critical patent/WO1999014426A1/fr

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
    • D21F3/0227—Belts or sleeves therefor
    • 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
    • D21F3/0227—Belts or sleeves therefor
    • D21F3/0236—Belts or sleeves therefor manufacturing methods

Definitions

  • This invention relates to improvements in extended nip press belts.
  • Extended nip dewatering presses are used in the press section of the paper making process, following forming of the paper web on a forming wire, to remove excess water from the paper web before the paper web is passed to a drying stage of the paper making process.
  • the paper web is in intimate contact with one or two moisture-absorbing felts, moves in pressure contact with a press roll and is urged into such contact by a pressure shoe acting through a belt in contact with the outermost (in relation to the press roll) of the moisture absorbing felts.
  • the belt is used to provide a low or zero friction passage of the web and felt(s) through the nip.
  • These belts generally comprise structured reinforcing yarns or a membrane which may be perforated, embedded in a matrix of a suitable plastics material and may be provided with ribbing for example on the surface which contacts the press felt to form grooves which carry away water squeezed from the paper web and the press felt in the nip.
  • a membrane which is effectively a mesh of machine-direction and cross machine direction strips and incorporating machine direction reinforcement yarns is embedded in a matrix of a thermoset polyurethane material, which extends through the apertures in the membrane and forms layers above and below the membrane.
  • a thermoset polyurethane material which extends through the apertures in the membrane and forms layers above and below the membrane.
  • two mesh membranes may be overlayed, with the strips of one membrane being set at an angle relative to those of the other so that the grid of one membrane is set on the machine direction and cross machine axes, whilst the grid of the other is set obliquely to the machine direction
  • a non-woven fabric which is applicable to a range of uses, including a press felt substrate, wherein the fabric is cast in strips having reinforcing yarns extending longitudinally of the strips, and holes formed in the membrane by means of teeth on the casting surface
  • CA-A-2068800 indicates that it is known to form a press belt from overlaid strips which cross each other both being arranged obliquely relative to the machine direction but at opposed angles and discloses a variant wherein strips are overlaid at a small oblique angle to the machine direction of the order of 2°-5°, the strips in the upper layer being offset by half a strip width with respect to the strips of the lower layer
  • This belt is considered to lack cross-directional rigidity and the strips are made by a slow and cumbersome weaving technique
  • Spiral-link reinforced belts have been proposed, eg incorporating a spiral link substrate of cross-machine direction connecting wires, about which are looped flattened helical coils linking each respective pair of wires and interdigitated with the next adjacent coils embedded in a suitable plastics matrix
  • These have proven to be problematical due to poor bonding between the polyurethane matrix and the polyester spiral link fabric.
  • the only alternative materials for making spiral link fabrics PEEK and PPS are however too expensive to be considered a viable option for solving this problem of incompatibility
  • An object of this invention is to provide a new extended nip press belt which achieves a much greater bonding between the matrix material and the reinforcing structure or membrane
  • a press belt comprises a coarse mesh composite membrane comprising reinforcing yarns extending in at least one direction in a plastics
  • the membrane being formed as or into strips and the strips being joined along their longitudinal edges, the strips being arranged such that the reinforcing yams extend substantially in the cross machine direction of the belt and embedded in a further matrix also including further reinforcing yarns extending substantially in the machine direction of the belt
  • the invention also comprises a method of manufacturing a press belt
  • the strips may be formed by melting their longitudinal edges and allowing the edges to fuse together and then cooled to allow the fused regions to set
  • the matrix polymer of the strips and/or the completed felt is preferably
  • polyurethane and the reinforcing yarns may be multi filament yarns selected from for example polyester, polyamide, PEEK, PPS, PBO, aramid, glass, carbon or steel.
  • Fig 1 is a diagrammatic sectional view of a press belt according to the invention on a line perpendicular to the machine direction,
  • Fig.2 is a diagrammatic sectional view of the press belt of fig 1 on a line parallel to the machine direction, i e on line 11-11 of fig 1,
  • Fig 3 is a perspective view of part of a first form of belt substrate
  • Fig 4 is a similar view of a second form of belt substrate
  • Fig.5 is a detail of apparatus for use in edge to edge joining of strips of belt substrate according to any of fig.3 or fig 4, and
  • Fig 6 is a diagram of a machine for subsequently coating the resulting belt fabric with a further matrix and reinforcing yarns
  • figs 1 and 2 are diagrammatic sections, substantially at right angles to each other, through a completed press belt fabric according to the invention
  • the press belt comprises a substrate or support layer 10, comprising a plurality of reinforcing yarns 11 extending substantially in the cross machine direction, wherein a matrix 12 of polyurethane, which has an array of apertures 13 which may be formed by casting the layer 10 on a studded or pinned drum, as known for example from GB- A-2202893
  • the layer 10 is either divided into a plurality of strips, or cast in the form of strips 14 which as shown in fig 2 are laid side by side, extending across the width of the belt, and their edges are joined by melting together to form fusion joints 15
  • the layer 10 is then covered or embedded in a further matrix 16, in which are embedded further reinforcing yarns 17, which run approximately at right angles to the reinforcing yams 11 in the support layer 10, that is extending in the machine direction longitudinally of the finished belt
  • the upper surface of the matrix 16 may, in known manner, be provided with grooves 18 to lead expressed water away from the nip
  • Fig 3 illustrates one form of substrate 10 useable in the invention substantially according to WO 92/02677, wherein a grid or mesh membrane 20, comprises longitudinal and transverse members with included apertures
  • This membrane 20 also has reinforcing yams 21 extending along one set of the longitudinal or transverse members, and the grid is set in a matrix 22 of eg polyurethane which extends substantially above and below the membrane
  • Fig 4 illustrates a fragment of another form of membrane 30, with reinforcing yarns 31 embedded in a plastics matrix 32, and having circular holes 33 extending through the membrane 30 from one face to the other
  • This membrane is substantially as described in GB-A-2202893, without the fibrous batt layer added in that disclosure
  • the membrane eg according to fig 3 or fig 4 is either formed as strips or cut into strips and then laid circumferentially about a form 40 with pins 41 to enter holes such as 31 in the membrane eg as in fig 5 and abutting edge regions are melted and fused with the addition of further polymer to join the edges together thereby fabricating a continuous belt composed of an array of such strips extending widthwise across the belt, joined edge to edge
  • a matrix layer over the substrate
  • the substrate is passed as a continuous belt over end rollers 60, 61 one of which 60 is adjustable to vary tension
  • a plurality of reinforcing yarns 62 are fed in the direction of belt travel from a supply 63 onto the upper surface of the substrate
  • Mat ⁇ x material 64 such as polyurethane is fed onto the belt between moulding belts 65 and 66 to embed the yams 62 and encapsulate the substrate and reinforcing yams in a matrix to provide a structure of the type illustrated in figs 1 and 2 above
  • the matrix polymers are typically polyurethane and the reinforcing yams may be multifilament yams such as polyester, nylon, PEEK, PPS, PBO, aramid, glass, carbon or steel, although monofilament yarns or even twisted, braided or plied yarns may be used At least some of the yarns may be coated, preferably with an elastomer such as TPU
  • Press belts made by the method of the invention have a number of advantages including improved delamination and crack resistance due to improved bonding between the polyurethane matrix and the polyurethane or TPU membrane, in addition to optimised bonding between the matrix and the added running direction reinforcing yams Regular structure is also maintained due to there being no sagging of the cross- direction yams
  • the reinforcing structure can be closer to the centre of the belt for better strength properties and for protection against wear from the presser shoe side of the belt
  • a monocoque, fully encapsulated reinforcing structure is obtained to protect against wear, eliminate air bubble formation and improve delamination resistance

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
  • Fixing For Electrophotography (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Press Drives And Press Lines (AREA)
  • Belt Conveyors (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne une courroie de presse avec zone de pression étendue, qui comprend une pluralité de bandes (14) constituées chacune d'une matrice de matières plastiques (12), ayant des perforations (13) pour former une structure maillée ou une membrane perforée, et comportant par ailleurs des fils d'armature (11) qui s'étendent le long des bandes. Ces bandes (14) sont disposées bord à bord sur la largeur de la courroie, et leurs bordures sont réunies par fusion le long de jointures (15). La couche ainsi formée est noyée dans une autre matrice (16) qui comprend d'autres fils d'armature (17) à angle droit avec les fils (11) et donc dans le sens machine de la courroie finale.
PCT/GB1998/002735 1997-09-18 1998-09-10 Ameliorations relatives aux courroies de presse avec zone de pression etendue WO1999014426A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002304072A CA2304072A1 (fr) 1997-09-18 1998-09-10 Ameliorations relatives aux courroies de presse avec zone de pression etendue
DE69805532T DE69805532T2 (de) 1997-09-18 1998-09-10 Verbesserungen beim pressband für breit-nip-pressen
AT98942876T ATE217924T1 (de) 1997-09-18 1998-09-10 Verbesserungen beim pressband für breit-nip- pressen
JP2000511954A JP2001516820A (ja) 1997-09-18 1998-09-10 長ニッププレスベルトの改良
EP98942876A EP1015688B1 (fr) 1997-09-18 1998-09-10 Ameliorations relatives aux courroies de presse avec zone de pression etendue

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9719748.7 1997-09-18
GBGB9719748.7A GB9719748D0 (en) 1997-09-18 1997-09-18 Improvements in extended nip press belts

Publications (1)

Publication Number Publication Date
WO1999014426A1 true WO1999014426A1 (fr) 1999-03-25

Family

ID=10819197

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/002735 WO1999014426A1 (fr) 1997-09-18 1998-09-10 Ameliorations relatives aux courroies de presse avec zone de pression etendue

Country Status (8)

Country Link
EP (1) EP1015688B1 (fr)
JP (1) JP2001516820A (fr)
AT (1) ATE217924T1 (fr)
CA (1) CA2304072A1 (fr)
DE (1) DE69805532T2 (fr)
ES (1) ES2178251T3 (fr)
GB (1) GB9719748D0 (fr)
WO (1) WO1999014426A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0939162A2 (fr) * 1998-02-26 1999-09-01 Ichikawa Co.,Ltd. Bande pour presse à patin et son procédé de fabrication
WO2002038859A1 (fr) * 2000-11-10 2002-05-16 Yamauchi Corporation Courroie de fabrication de papier et son procede de fabrication
WO2003071030A1 (fr) * 2002-02-23 2003-08-28 Voith Fabrics Patent Gmbh Courroie de machine a papier
US7014733B2 (en) 2002-05-14 2006-03-21 Stowe Woodward L.L.C. Belt for shoe press and shoe calender and method for forming same
WO2007033877A1 (fr) * 2005-09-23 2007-03-29 Voith Patent Gmbh Habillage pour machine a papier
WO2007042623A1 (fr) * 2005-10-14 2007-04-19 Tamfelt Oyj Abp Courroie de compression
US10203011B2 (en) 2014-06-11 2019-02-12 Volvo Truck Corporation Braking arrangement and an attachment member
WO2021058171A1 (fr) * 2019-09-27 2021-04-01 Voith Patent Gmbh Chemise de presse, son utilisation, rouleau de presse et presse à sabot

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992002677A1 (fr) * 1990-07-28 1992-02-20 Scapa Group Plc Bande sans fin pour presses plieuses allongees servant a l'essorage du papier ou similaire
DE4340344A1 (de) * 1993-11-26 1994-04-07 Voith Gmbh J M Preßband für eine Preßeinrichtung, insbesondere für die Papierfabrikation
GB2287484A (en) * 1994-03-15 1995-09-20 Scapa Group Plc Belt for long nip dewatering presses

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992002677A1 (fr) * 1990-07-28 1992-02-20 Scapa Group Plc Bande sans fin pour presses plieuses allongees servant a l'essorage du papier ou similaire
DE4340344A1 (de) * 1993-11-26 1994-04-07 Voith Gmbh J M Preßband für eine Preßeinrichtung, insbesondere für die Papierfabrikation
GB2287484A (en) * 1994-03-15 1995-09-20 Scapa Group Plc Belt for long nip dewatering presses

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0939162A2 (fr) * 1998-02-26 1999-09-01 Ichikawa Co.,Ltd. Bande pour presse à patin et son procédé de fabrication
EP0939162A3 (fr) * 1998-02-26 2000-11-22 Ichikawa Co.,Ltd. Bande pour presse à patin et son procédé de fabrication
WO2002038859A1 (fr) * 2000-11-10 2002-05-16 Yamauchi Corporation Courroie de fabrication de papier et son procede de fabrication
US7090747B2 (en) 2000-11-10 2006-08-15 Yamauchi Corporation Belt for papermarking and process for producing papermaking belt
US7374641B2 (en) 2000-11-10 2008-05-20 Yamauchi Corporation Papermaking belt and method of manufacturing papermaking belt
WO2003071030A1 (fr) * 2002-02-23 2003-08-28 Voith Fabrics Patent Gmbh Courroie de machine a papier
US7014733B2 (en) 2002-05-14 2006-03-21 Stowe Woodward L.L.C. Belt for shoe press and shoe calender and method for forming same
WO2007033877A1 (fr) * 2005-09-23 2007-03-29 Voith Patent Gmbh Habillage pour machine a papier
WO2007042623A1 (fr) * 2005-10-14 2007-04-19 Tamfelt Oyj Abp Courroie de compression
US10203011B2 (en) 2014-06-11 2019-02-12 Volvo Truck Corporation Braking arrangement and an attachment member
WO2021058171A1 (fr) * 2019-09-27 2021-04-01 Voith Patent Gmbh Chemise de presse, son utilisation, rouleau de presse et presse à sabot

Also Published As

Publication number Publication date
ATE217924T1 (de) 2002-06-15
GB9719748D0 (en) 1997-11-19
DE69805532D1 (de) 2002-06-27
DE69805532T2 (de) 2003-01-09
JP2001516820A (ja) 2001-10-02
EP1015688A1 (fr) 2000-07-05
CA2304072A1 (fr) 1999-03-25
ES2178251T3 (es) 2002-12-16
EP1015688B1 (fr) 2002-05-22

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