GB2284772A - Papermachine shoe press belt fabric with polymer coating including a thixotrope - Google Patents

Papermachine shoe press belt fabric with polymer coating including a thixotrope Download PDF

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Publication number
GB2284772A
GB2284772A GB9325608A GB9325608A GB2284772A GB 2284772 A GB2284772 A GB 2284772A GB 9325608 A GB9325608 A GB 9325608A GB 9325608 A GB9325608 A GB 9325608A GB 2284772 A GB2284772 A GB 2284772A
Authority
GB
United Kingdom
Prior art keywords
papermachine clothing
thixotrope
polymer
papermachine
making
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.)
Granted
Application number
GB9325608A
Other versions
GB9325608D0 (en
GB2284772B (en
Inventor
Craig Valentine
Ian Christison Sayers
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.)
Scapa Group Ltd
Original Assignee
Scapa Group Ltd
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 Ltd filed Critical Scapa Group Ltd
Priority to GB9325608A priority Critical patent/GB2284772B/en
Publication of GB9325608D0 publication Critical patent/GB9325608D0/en
Priority to JP7516607A priority patent/JPH09507534A/en
Priority to CA 2179172 priority patent/CA2179172A1/en
Priority to PCT/GB1994/002731 priority patent/WO1995016820A1/en
Priority to EP95902897A priority patent/EP0734471A1/en
Priority to AU12159/95A priority patent/AU1215995A/en
Publication of GB2284772A publication Critical patent/GB2284772A/en
Priority to FI962458A priority patent/FI962458A0/en
Application granted granted Critical
Publication of GB2284772B publication Critical patent/GB2284772B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00—Producing belts or bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/733—Fourdrinier belts

Abstract

A shoe press belt for a papermachine includes a base fabric with a polymer coating including a thixotrope. The thixotrope may be aramid fibres or fused silica. The coating is applied by feeding the coating from a nozzle into the nip 15 between the base cloth 13 and rotating drum 11. <IMAGE>

Description

PAPERMACHINE CLOTHING The present invention relates to papermachine clothing and particularly but not exclusively to shoe press belts.
One form of papermachine clothing comprises a woven or non woven base cloth to which a coating of polymer is applied. In one method of manufacture an endless base cloth is fed around a series of rollers and around a part of a horizontally mounted rotatable drum.
As the belt passes around the drum heat-softened polymer is applied into the nip between the belt and the drum.
In this process there is a tendency for the heat softened polymer to slump as it approaches the base of the drum. This is undesirable in that the polymeric layer applied to the belt is of non uniform thickness.
The present invention has been made from a consideration of this problem.
According to a first aspect of the present invention there is provided a method of making papermachine clothing comprising the step of feeding a base cloth over a rotating body and applying a polymer coating to the base cloth as the base cloth is fed over the rotating body, wherein the polymer coating is impregnated with a thixotrope. The thixotrope acts to increase the viscosity of the "fluid" polymer once applied to the base cloth.
Surprisingly the toughness, modulus and abrasion resistance of the papermachine clothing is significantly improved by incorporation of the thixotrope into the polymer coating.
According to a second aspect of the present invention there is provided papermachine clothing having a coating of polymer thereon, wherein the polymer is impregnated with a thixotrope.
Aramid fibres such as KEVLAR (RTM) (para-phenylene terephthalamide) are preferred. The fibres are preferably chopped into lengths in the range from 0.8mum to 4.00mm and preferably have a diameter in the order of 12cm. KEVLAR (RTM) is particularly preferred in that the random orientation and physical entanglement of the fibres and fibrils thereof align in the direction of applied shear thus increasing the viscosity of the polymer. Alternatively fused silica may be used as a thixotrope.
The polymer is preferably thermoset. Polyurethane is preferred.
In order that the present invention may be more readily understood a specific embodiment thereof will now be described by way of example only with reference to the single accompanying drawing which shows one apparatus for making papermachine clothing in accordance with the present invention.
Referring to the drawing an apparatus 10 for making papermachine clothing such as a shoe press belt comprises a horizontally mounted rotatable drum 11 and a plurality of rollers 12 which define a path over which an endless base cloth 13 travels. A series of infra-red heaters 14 are provided adjacent the drum 11 on the side of the base cloth 13 which is remote from the drum 11.
A polyurethane coating may be applied to the base cloth 13 by utilising a feed nozzle to project the heat softened polymer into the nip 15 between the base cloth 13 and the top of the drum 11. The polyurethane coating is impregnated with chopped aramid fibres in order to prevent sagging of the polymer on the drum and to improve the abrasion resistance of the belt.
In order to impregnate the polyurethane coating with the chopped aramid fibres the fibres are added in substantially equal amounts to the thermoset precursor material. The aramid containing precursors (e.g. polyol and isocyanate) are mixed immediately prior to applying the impregnated coating to the base cloth. The amount of aramid fibre added is preferably less than 3% by weight.
The strength of a prior art polyurethane coated belt "A" was tested. Similarly the strength of a belt incorporating 0.17% KEVLAR (RTM) was tested. The results are set out below.
Average Strength (Kg/2.5cm) 'A' Polyurethane (Prior Art) 91.3 'B' Polyurethane 94.5 + 0.17% Kevlar It can be seen that the incorporation of very small amounts of KEVLAR fibres significantly increases the strength of the press belt.
It is to be understood that the above described embodiment is by way of illustration only. Many modifications and variations are possible.

Claims (20)

1. A method of making papermachine clothing comprising the step of feeding a base cloth over a rotating body and applying a polymer coating to the base cloth as the base cloth is fed over the rotating body, wherein the polymer coating is impregnated with a thixotrope.
2. A method of making papermachine clothing as claimed in claim 1, wherein the thixotrope comprises an aramid.
3. A method of making papermachine clothing as claimed in claim 1 or claim 2, wherein the thixotrope comprises aramid fibres.
4. A method of making papermachine clothing as claimed in claim 3, wherein the length of the fibres is in the range from 0.8mm to 4.0mm.
5. A method of making papermachine clothing as claimed in claim 3 or claim 4, wherein the fibres have a diameter of substantially 12 m.
6. A method of making papermachine clothing as claimed in claim 1, wherein the thixotrope comprises fused silica.
7. A method of making papermachine clothing as claimed in any preceding claim, wherein the polymer is a thermosetting polymer.
8. A method as claimed in any preceding claim, wherein the polymer comprises polyurethane.
9. A method of making a shoe press belt using the method of any of claims 1 to 8.
10. Papermachine clothing comprising a base cloth having a polymer coating thereon, wherein the polymer is impregnated with a thixotrope.
11. Papermachine clothing as claimed in claim 10, wherein the thixotrope comprises an aramid.
12. Papermachine clothing as claimed in claim 10 or claim 11, wherein the thixotrope comprises aramid fibres.
13. Papermachine clothing as claimed in claim 12, wherein the length of the fibres is in the range from 0.08mm to 4.Omm.
14. Papermachine clothing as claimed in claim 12 or claim 13, wherein the fibres have a diameter of substantially 12 pm.
15. Papermachine clothing as claimed in claim 10, wherein the thixotrope comprises fused silica.
16. Papermachine clothing as claimed in any of claims 10 to 15, wherein the polymer is thermoset.
17. Papermachine clothing as claimed in any of claims 10 to 15, wherein the polymer comprises polyurethane.
18. The use of the papermachine clothing of any of claims 10 to 17 as a shoe press belt.
19. A method of making papermachine clothing substantially as defined herein with reference to the accompanying drawing.
20. Papermachine clothing substantially as defined herein with reference to the accompanying drawing.
GB9325608A 1993-12-15 1993-12-15 Papermachine clothing Expired - Fee Related GB2284772B (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB9325608A GB2284772B (en) 1993-12-15 1993-12-15 Papermachine clothing
JP7516607A JPH09507534A (en) 1993-12-15 1994-12-14 Paper machine clothing
CA 2179172 CA2179172A1 (en) 1993-12-15 1994-12-14 Papermachine clothing
PCT/GB1994/002731 WO1995016820A1 (en) 1993-12-15 1994-12-14 Papermachine clothing
EP95902897A EP0734471A1 (en) 1993-12-15 1994-12-14 Papermachine clothing
AU12159/95A AU1215995A (en) 1993-12-15 1994-12-14 Papermachine clothing
FI962458A FI962458A0 (en) 1993-12-15 1996-06-13 The paper machine fabric

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9325608A GB2284772B (en) 1993-12-15 1993-12-15 Papermachine clothing

Publications (3)

Publication Number Publication Date
GB9325608D0 GB9325608D0 (en) 1994-02-16
GB2284772A true GB2284772A (en) 1995-06-21
GB2284772B GB2284772B (en) 1997-11-26

Family

ID=10746614

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9325608A Expired - Fee Related GB2284772B (en) 1993-12-15 1993-12-15 Papermachine clothing

Country Status (7)

Country Link
EP (1) EP0734471A1 (en)
JP (1) JPH09507534A (en)
AU (1) AU1215995A (en)
CA (1) CA2179172A1 (en)
FI (1) FI962458A0 (en)
GB (1) GB2284772B (en)
WO (1) WO1995016820A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1559534A1 (en) * 2002-06-11 2005-08-03 Yamauchi Corporation Industrial elastic belt and method for manufacture thereof
US8092654B2 (en) * 2009-11-27 2012-01-10 Ichikawa Co., Ltd. Process belt for papermaking and method for making the same

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5792323A (en) * 1995-09-07 1998-08-11 Albany International Corp. Spiral base structres for long nip paper machine press belts
US6447648B1 (en) * 1996-08-13 2002-09-10 Metso Paper, Inc. Anisotropic reinforced ribbon-cast blanket for extended nip press
FI103209B2 (en) † 1998-01-02 2005-04-04 Valmet Corp Method for surface coating of press or conveyor belts and corresponding surface-coated belt
ATE364750T1 (en) 2001-04-18 2007-07-15 Stowe Woodward Ag SHOE PRESS BELT
EP1293601A1 (en) 2001-09-17 2003-03-19 Stowe Woodward Aktiengesellschaft Belt for shoe press
US7011730B2 (en) 2002-12-30 2006-03-14 Albany International Corp. Structure for process belt
DE102004011665A1 (en) * 2004-03-10 2005-10-06 Stowe Woodward Ag Integral shoe press belt
PT1793036E (en) 2005-12-02 2014-11-11 Heimbach Gmbh & Co Kg Process for manufacturing impermeable papermaking belts and coating apparatus therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251928A (en) * 1978-05-30 1981-02-24 Asten Group Inc. Metal impregnated dryer fabric
WO1991016492A1 (en) * 1990-04-12 1991-10-31 The Procter & Gamble Company Process for chemically treating papermaking belts
US5207873A (en) * 1992-04-17 1993-05-04 Huyck Corporation Anti-contaminant treatment for papermaking fabrics

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2814079A1 (en) * 1978-04-01 1979-10-11 Bayer Ag COATING DIMENSIONS
DE2814173C2 (en) * 1978-04-01 1986-06-26 Bayer Ag, 5090 Leverkusen Coating compounds
US4287115A (en) 1979-11-13 1981-09-01 The Dow Chemical Company Filler mixtures and thermoset resins containing same
FR2543150B1 (en) * 1983-03-21 1986-07-11 Altulor Sa COMPOSITIONS FOR COATING OF ACRYLIC POLYMER AND FINISHED PRODUCTS THEREOF
US4640950A (en) * 1983-06-22 1987-02-03 Takeda Chemical Industries, Ltd. Thixotropic polyurethane resin compositions
US4795480A (en) 1986-12-10 1989-01-03 Albany International Corp. Papermakers felt with a resin matrix surface
US4752519A (en) 1986-12-10 1988-06-21 Albany International Corp. Papermakers felt with a resin matrix surface
US4944820A (en) * 1988-04-08 1990-07-31 Beloit Corporation Method for making a blanket for an extended nip press
US4944844A (en) 1989-07-11 1990-07-31 Beloit Corporation Polyurethane extended nip press blanket

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251928A (en) * 1978-05-30 1981-02-24 Asten Group Inc. Metal impregnated dryer fabric
WO1991016492A1 (en) * 1990-04-12 1991-10-31 The Procter & Gamble Company Process for chemically treating papermaking belts
US5207873A (en) * 1992-04-17 1993-05-04 Huyck Corporation Anti-contaminant treatment for papermaking fabrics

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1559534A1 (en) * 2002-06-11 2005-08-03 Yamauchi Corporation Industrial elastic belt and method for manufacture thereof
EP1559534A4 (en) * 2002-06-11 2006-04-12 Yamauchi Corp Industrial elastic belt and method for manufacture thereof
US8092654B2 (en) * 2009-11-27 2012-01-10 Ichikawa Co., Ltd. Process belt for papermaking and method for making the same

Also Published As

Publication number Publication date
CA2179172A1 (en) 1995-06-22
GB9325608D0 (en) 1994-02-16
FI962458A (en) 1996-06-13
JPH09507534A (en) 1997-07-29
WO1995016820A1 (en) 1995-06-22
AU1215995A (en) 1995-07-03
FI962458A0 (en) 1996-06-13
GB2284772B (en) 1997-11-26
EP0734471A1 (en) 1996-10-02

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732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20021215