WO1995028519A1 - Papermachine clothing - Google Patents

Papermachine clothing Download PDF

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Publication number
WO1995028519A1
WO1995028519A1 PCT/GB1995/000866 GB9500866W WO9528519A1 WO 1995028519 A1 WO1995028519 A1 WO 1995028519A1 GB 9500866 W GB9500866 W GB 9500866W WO 9528519 A1 WO9528519 A1 WO 9528519A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibres
papermachine clothing
self
crimping
batt
Prior art date
Application number
PCT/GB1995/000866
Other languages
French (fr)
Inventor
Ian Christison Sayers
Thomas Saunders
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 AU22212/95A priority Critical patent/AU2221295A/en
Publication of WO1995028519A1 publication Critical patent/WO1995028519A1/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/083—Multi-layer felts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper

Definitions

  • This invention concerns papermachine clothing and has particular, although not exclusive reference to such clothing for use in the press section of a papermachine.
  • Press felts are used during the manufacture of paper to carry the soft and moist paper sheet through presses as water is progressively squeezed out of the paper sheet.
  • press felts comprise one or more woven or non-woven basecloths and one or more batts of staple fibres, typically made from polyamide, secured to the base cloths, for example, by needling.
  • the principal cause of press felt failure is damage caused by compaction of the felt over a long period of time after repeatedly being subjected to high pressure in the nip regions of the press rollers. This damage manifests itself in fabric wear and will lead to marking or breaking of the paper sheet. Furthermore, increased fabric wear will reduce the dewatering capability of the fabric.
  • the staple fibres of the press felt have a certain degree of crimp. Without this the fibre webs would only be held together by frictional forces and would fall apart. Compaction of the felt is resisted by the resilience of the staple fibre layer. Repeated passing through pressure nips gradually reduces this resilience, and it is the loss of this resilience that leads to rapid fabric wear.
  • papermachine clothing comprising one or more basecloths and at least one staple fibre layer, wherein at least a part of at least one of said staple fibre layers comprises self-crimping fibres having a helical configuration.
  • the method of the present invention addresses this problem.
  • a method of making papermachine clothing comprising one or more basecloths and at least one staple fibre layer comprising self-crimping fibres, wherein the method comprises the steps of providing a batt of said fibres in a substantially non-crimped condition, securing said batt onto the basecloth and treating the fibres such that they adopt a helical configuration.
  • This method therefore allows batt layers containing fibres with substantially greater resilience than conventional crimped fibres to be prepared without the difficulties associated with the carding of tightly-intermeshed highly crimped staple yarns.
  • the staple fibres are preferably secured to the base cloth or cloths by needling.
  • the felt is preferably treated with resin solution and subsequently heated so as to remove the solvent.
  • the resin is subsequently heat set.
  • the self-crimping fibres are typically of a bicomponent nature, comprising two polymers having different melting points e.g. polyester/polyester, copolyester/polyester.
  • Examples of self-crimping fibres are N780, N784 and N790 all being recognised trade marks of products sold by Kuraray Inc..
  • the bicomponent fibres adopt a substantially helical configuration upon being heat treated.
  • the temperature required for the fibre to adopt such a helical configuration is preferably within the temperature range required for heat setting the press felt, i.e. 160°C to 170°C.
  • the fibres are preferably heat-treated in-situ on the felt rather than prior to needling them to the basecloth.
  • the batt is secured to the basecloth prior to treating the fibres.
  • the batt is secured to the basecloth after said treatment of the fibres has taken place.
  • a batt of uncrimped staple fibres is formed.
  • the batt is then heat-set and subsequently attached to the basecloth by needling.
  • the fibres may be heat treated either immediately after carding, immediately before pre-tacking or immediately before needling.
  • the fineness of the self-crimping fibres is preferably in the range from 10-40 dtex. Preferably only a relatively small amount of self-crimping fibres are contained within at least one and preferably each layer of needled batt, i.e. less than 20% by weight.
  • the fibres may be crimped any time after forming the batt.
  • the fibres may be crimped immediately, after carding, immediately before pre-tacking or immediately before needling.
  • Fig.l shows a press felt in accordance with the method of the present invention.
  • Fig.2 shows a constituent crimped staple fibre of the non-woven layer of the felt of Fig.l.
  • a press felt 10 comprises a woven base cloth 11 having a batt of staple fibres 12 secured thereto by needling.
  • the felt is then treated with aqueous resin solution.
  • the resin-treated felt is then heat-treated at a temperature of at least 100°C so as to remove the water and the resin is subsequently heat-set.
  • the staple fibres crimp into a strong helical configuration as shown in Fig.2.
  • the press felt made in accordance with the present invention offers improved resilience.

Landscapes

  • Paper (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

Papermachine clothing (10) comprising one or more basecloths (11) and at least one staple fibre batt (12). At least a part of at least one batt (12) is made up of bicomponent self-crimping fibres which adopt a helical configuration on being heat treated.

Description

PAPERMACHINE CLOTHING
This invention concerns papermachine clothing and has particular, although not exclusive reference to such clothing for use in the press section of a papermachine.
Press felts are used during the manufacture of paper to carry the soft and moist paper sheet through presses as water is progressively squeezed out of the paper sheet.
Conventionally, press felts comprise one or more woven or non-woven basecloths and one or more batts of staple fibres, typically made from polyamide, secured to the base cloths, for example, by needling.
The principal cause of press felt failure is damage caused by compaction of the felt over a long period of time after repeatedly being subjected to high pressure in the nip regions of the press rollers. This damage manifests itself in fabric wear and will lead to marking or breaking of the paper sheet. Furthermore, increased fabric wear will reduce the dewatering capability of the fabric. The staple fibres of the press felt have a certain degree of crimp. Without this the fibre webs would only be held together by frictional forces and would fall apart. Compaction of the felt is resisted by the resilience of the staple fibre layer. Repeated passing through pressure nips gradually reduces this resilience, and it is the loss of this resilience that leads to rapid fabric wear.
According to a first aspect of the present invention there is provided papermachine clothing comprising one or more basecloths and at least one staple fibre layer, wherein at least a part of at least one of said staple fibre layers comprises self-crimping fibres having a helical configuration.
These self-crimping fibres provide superior resilience and exhibit greater resistance to compaction and fibre abrasion than conventional fibres. Thus the working life of the felt is increased and the likelihood of marking problems is reduced.
Using such helical configuration fibres in a conventional felt preparation would present problems at the carding stage, where the strong helical configuration would mean that the staple fibres would be more difficult to pull apart in order to form a batt.
The method of the present invention addresses this problem.
According to a second aspect of the invention there is provided a method of making papermachine clothing comprising one or more basecloths and at least one staple fibre layer comprising self-crimping fibres, wherein the method comprises the steps of providing a batt of said fibres in a substantially non-crimped condition, securing said batt onto the basecloth and treating the fibres such that they adopt a helical configuration.
This method therefore allows batt layers containing fibres with substantially greater resilience than conventional crimped fibres to be prepared without the difficulties associated with the carding of tightly-intermeshed highly crimped staple yarns.
The staple fibres are preferably secured to the base cloth or cloths by needling. The felt is preferably treated with resin solution and subsequently heated so as to remove the solvent. The resin is subsequently heat set.
At least some of the self-crimping fibres are typically of a bicomponent nature, comprising two polymers having different melting points e.g. polyester/polyester, copolyester/polyester. Examples of self-crimping fibres are N780, N784 and N790 all being recognised trade marks of products sold by Kuraray Inc.. The bicomponent fibres adopt a substantially helical configuration upon being heat treated. The temperature required for the fibre to adopt such a helical configuration is preferably within the temperature range required for heat setting the press felt, i.e. 160°C to 170°C. The fibres are preferably heat-treated in-situ on the felt rather than prior to needling them to the basecloth.
In one embodiment of the invention the batt is secured to the basecloth prior to treating the fibres. In an alternative embodiment the batt is secured to the basecloth after said treatment of the fibres has taken place. Here a batt of uncrimped staple fibres is formed. The batt is then heat-set and subsequently attached to the basecloth by needling. Here the fibres may be heat treated either immediately after carding, immediately before pre-tacking or immediately before needling.
The fineness of the self-crimping fibres is preferably in the range from 10-40 dtex. Preferably only a relatively small amount of self-crimping fibres are contained within at least one and preferably each layer of needled batt, i.e. less than 20% by weight.
The fibres may be crimped any time after forming the batt. Thus the fibres may be crimped immediately, after carding, immediately before pre-tacking or immediately before needling.
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 accompanying drawings in which:-
Fig.l shows a press felt in accordance with the method of the present invention; and
Fig.2 shows a constituent crimped staple fibre of the non-woven layer of the felt of Fig.l.
Referring to the drawings a press felt 10 comprises a woven base cloth 11 having a batt of staple fibres 12 secured thereto by needling. The felt is then treated with aqueous resin solution. The resin-treated felt is then heat-treated at a temperature of at least 100°C so as to remove the water and the resin is subsequently heat-set. During heat setting of the resin the staple fibres crimp into a strong helical configuration as shown in Fig.2.
The press felt made in accordance with the present invention offers improved resilience.
It is to be understood that the above described embodiment has been described by way of illustration only. Many modifications and variations are possible.

Claims

1. Papermachine clothing comprising one or more basecloths and at least one staple fibre layer, wherein at least a part of at least one of said staple fibre layers comprises self- crimping fibres having a helical configuration.
2. Papermachine clothing as claimed in claim 1, wherein the staple fibres are secured to the basecloth or basecloths by needling.
3. Papermachine clothing as claimed in claim 1 or claim 2, wherein the papermachine clothing is treated with resin.
4. Papermachine clothing as claimed in any preceding claim, wherein at least some of the self-crimping fibres are of a bicomponent nature comprising two polymers having different melting points.
5. Papermachine clothing as claimed in any preceding claim, wherein said at least one staple fibre layer comprises less than 20% by weight of self-crimping helical fibres.
6. Papermachine clothing as claimed in any preceding claim, wherein the self-crimping fibres have a fineness in the range from 10-40 dtex.
7. A method of making papermachine clothing comprising one or more basecloths and at least one staple fibre layer comprising self-crimping fibres, wherein the method comprises the steps of providing a batt of said fibres in a substantially non-crimped condition, securing said batt onto the basecloth and treating the fibres such that they adopt a helical configuration.
8. A method of making papermachine clothing as claimed in claim 6, wherein the batt is secured to the basecloth prior to treating the fibres.
9. A method of making papermachine clothing as claimed in claim 6, wherein the batt is secured to the basecloth after treating the fibres.
10. A method of making papermachine clothing as claimed in any of claims 7 to 9, wherein the staple fibres are secured to the basecloth or basecloths b needling.
11. A method of making papermachine clothing as claimed in any of claims 7 to 10, wherein the papermachine clothing is treated with resin.
12. A method of making papermachine clothing as claimed in any of claims 7 to 11, wherein at least some of the self- crimping fibres are of a bicomponent nature comprising two polymers having different melting points.
13. A method of making papermachine clothing as claimed in any of claims 7 to 12, wherein at least one staple fibre layer comprises less than 20% by weight of self-crimping helical fibres.
14. A method of making papermachine clothing as claimed in any of claims 7 to 13, wherein the self-crimping fibres have a fineness in the range from 10-40 dtex.
PCT/GB1995/000866 1994-04-15 1995-04-13 Papermachine clothing WO1995028519A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU22212/95A AU2221295A (en) 1994-04-15 1995-04-13 Papermachine clothing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9407462A GB9407462D0 (en) 1994-04-15 1994-04-15 Papermachine clothing
GB9407462.2 1994-04-15

Publications (1)

Publication Number Publication Date
WO1995028519A1 true WO1995028519A1 (en) 1995-10-26

Family

ID=10753562

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/000866 WO1995028519A1 (en) 1994-04-15 1995-04-13 Papermachine clothing

Country Status (3)

Country Link
AU (1) AU2221295A (en)
GB (2) GB9407462D0 (en)
WO (1) WO1995028519A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0741204A2 (en) 1995-05-04 1996-11-06 Huyck Licensco, Inc. Papermakers' press fabric
DE19803493C1 (en) * 1998-01-29 1999-04-29 Inventa Ag Paper machine felt
DE102007000578A1 (en) 2007-10-26 2009-04-30 Voith Patent Gmbh Paper machine clothing, particularly press felt, is made of fibers, from one or more thermoplastic polyurethanes, and fiber titre of fibers from one or more thermoplastic polyurethanes is selected in range of certain decitex

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992010607A1 (en) * 1990-12-05 1992-06-25 Albany International Corp. Improvements in and relating to paper machine clothing
EP0529506A1 (en) * 1991-08-23 1993-03-03 Ems-Inventa Ag Paper-machine felt and method of making the same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1111113A (en) * 1964-04-22 1968-04-24 Mercer Ltd F B Improvements in or relating to the manufacture of non-woven fabrics
US3589956A (en) * 1966-09-29 1971-06-29 Du Pont Process for making a thermally self-bonded low density nonwoven product
GB1179436A (en) * 1967-05-22 1970-01-28 Ici Ltd Helically Crimped Filamentary Materials
ZA815443B (en) * 1980-12-10 1982-11-24 Albany Int Corp Wet press felt for papermaking machine
US4414263A (en) * 1982-07-09 1983-11-08 Atlanta Felt Company, Inc. Press felt
US4439481A (en) * 1983-03-04 1984-03-27 Albany International Corp. Resole treated papermakers felt and method of fabrication
US4551378A (en) * 1984-07-11 1985-11-05 Minnesota Mining And Manufacturing Company Nonwoven thermal insulating stretch fabric and method for producing same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992010607A1 (en) * 1990-12-05 1992-06-25 Albany International Corp. Improvements in and relating to paper machine clothing
EP0529506A1 (en) * 1991-08-23 1993-03-03 Ems-Inventa Ag Paper-machine felt and method of making the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0741204A2 (en) 1995-05-04 1996-11-06 Huyck Licensco, Inc. Papermakers' press fabric
DE19803493C1 (en) * 1998-01-29 1999-04-29 Inventa Ag Paper machine felt
DE102007000578A1 (en) 2007-10-26 2009-04-30 Voith Patent Gmbh Paper machine clothing, particularly press felt, is made of fibers, from one or more thermoplastic polyurethanes, and fiber titre of fibers from one or more thermoplastic polyurethanes is selected in range of certain decitex

Also Published As

Publication number Publication date
GB2289482A (en) 1995-11-22
GB9407462D0 (en) 1994-06-08
AU2221295A (en) 1995-11-10
GB9507684D0 (en) 1995-05-31

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