EP0283181B1 - Improvements in or relating to papermachine and like clothing - Google Patents

Improvements in or relating to papermachine and like clothing Download PDF

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Publication number
EP0283181B1
EP0283181B1 EP88301956A EP88301956A EP0283181B1 EP 0283181 B1 EP0283181 B1 EP 0283181B1 EP 88301956 A EP88301956 A EP 88301956A EP 88301956 A EP88301956 A EP 88301956A EP 0283181 B1 EP0283181 B1 EP 0283181B1
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EP
European Patent Office
Prior art keywords
yarns
fabric
warp
face
layer
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
EP88301956A
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German (de)
French (fr)
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EP0283181A1 (en
Inventor
Ivan Fernhead
Ken Porteous
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
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Scapa Group Ltd
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Publication date
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Application filed by Scapa Group Ltd filed Critical Scapa Group Ltd
Priority to AT88301956T priority Critical patent/ATE63950T1/en
Publication of EP0283181A1 publication Critical patent/EP0283181A1/en
Application granted granted Critical
Publication of EP0283181B1 publication Critical patent/EP0283181B1/en
Anticipated expiration legal-status Critical
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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
    • D21F1/0045—Triple layer fabrics

Definitions

  • the invention concerns papermachine and like clothing and has particular reference to wet end fabrics.
  • Papermachine fabrics of double weave form are known wherein the face, or paper side, is of plain weave construction and the back of the fabric is, for example, a four-shaft satin.
  • face fabric is woven from "fine" warp and weft yarns, whilst in the back the warp and weft both comprise “coarse” yarns.
  • the known fabric as aforesaid whilst providing the smooth paper-receiving face necessary to avoid marking, does possess a characteristic which detracts from its effectiveness. More particularly, the fabric has a tendency to retain water, such water being released, by centrifugal forces, on passage of the fabric around support rollers at the end of a fabric run.
  • the present invention proposes a fabric wherein the inherent disadvantage of the prior structure as regards a high degree of water retention is avoided.
  • a flat woven forming fabric of double weave form comprising a face layer of plain weave construction and a back layer joined thereto by binder yarns
  • the warp yarns of the said back layer are of "fine" yarns having a diameter in the range 0.15 to 0.22 mms. woven individually with the weft yarns of the said back layer and extending to the fabric surface and in that the warp yarns of the face and back layers are of substantially the same thickness.
  • the warp and weft yarns of the face layer both comprise "fine" yarns.
  • fine yarns is meant a yarn of a diameter (or the equivalent) commonly used at the paper supporting face of a papermakers fabric, in contradistinction to the "coarse” yarn commonly used at the “machine” side of the fabric.
  • a “fine” yarn will be, say, 0. 22 mms in diameter, whilst a “coarse” yarn will have a diameter of, say, 0.35 mms.
  • a forming fabric for a papermaking machine is of double weave construction, and comprises a face layer 11 of plain weave and a back layer 12 defined by a 3 and 1 straight twill.
  • the warp and weft yarns 13, 14 of the face layer are "fine" yarns having diameters of 0.17 mms and 0.18 mms, respectively.
  • the warp yarns 15, of the fabric layer at the roller side are, in the present example, of like diameterto the warp yarns 13 of the face layer, and are present in like number at both faces of the fabric, whilst the weft yarns 16 have a diameter of 0.25 mms.
  • the weft binder yarns 17, two of which yarns are conveniently present in each pattern repeat, are of polyester monofilament of a diameter of 0.12 mms, the warp and weft yarns of both fabric layers similarly being monofilament polyester yarns.
  • weft In the face layer the weft is woven 24 picks per centimetre whilst in the back layer the corresponding figure is 16 picks per centimetre, there being 8 weft binder yarns per centimetre. There are 63 warp yarns per centimetre, in total.
  • the fabric as aforesaid has a thickness of 0.73 mm.
  • a conventional double weave fabric having a "fine" layer of plain weave and a “coarse” back layer comprising a 3 /1 twill, and wherein the diameter of the yarns of the face layer and back layer are respectively 0.17 and 0.25 mms.
  • the warp yarns exist as 26 ends per centimetre and 13 ends per centimetre in the face and back respectively, and wherein the weft direction yarns are present at 30, 15 and 7 picks per centimetre in the face layer, back layer and in the binding layer, has a thickness of 0.82 mms and a materially greater tendency to retain water than has the fabric of the invention.
  • the warp yarns at the back of the fabric are of the same diameter as those in the front, yarns of a different diameter may be preferred in some instances, although in practical terms, substantial differences could not be accommodated.
  • a warp diameter of 0.17 mms at one face is acceptable in combination with a warp diameter of 0.2 mms at the other face, but differences materially in excess of this may well give rise to difficulty. It is thought that, subject to the foregoing, warp yarns of a diameter lying within the range 0.15 to 0.22 mms will be of application in the context of the invention, with a preferred range of from 0.17 to 0.22 mms.
  • the weft yarns in the face and back of the fabric may be of a different diameter from each other and indeed from that of either of the warp yarns.

Abstract

A papermakers wet felt is proposed which comprises a flat woven duplex fabric wherein the warp yarns (15) at the roller side of the fabric are "fine" yarns of similar diameter to the warp yarns (13) of the face fabric and wherein the warp yarns (13, 15) exist in like numbers at both fabric faces. The fabric has a reduced tendency to retain water.

Description

  • The invention concerns papermachine and like clothing and has particular reference to wet end fabrics.
  • Papermachine fabrics of double weave form are known wherein the face, or paper side, is of plain weave construction and the back of the fabric is, for example, a four-shaft satin. In conventional fabrics of this kind the face fabric is woven from "fine" warp and weft yarns, whilst in the back the warp and weft both comprise "coarse" yarns. (see for example E.P.A. 0141791)
  • However, the known fabric as aforesaid, whilst providing the smooth paper-receiving face necessary to avoid marking, does possess a characteristic which detracts from its effectiveness. More particularly, the fabric has a tendency to retain water, such water being released, by centrifugal forces, on passage of the fabric around support rollers at the end of a fabric run.
  • The present invention proposes a fabric wherein the inherent disadvantage of the prior structure as regards a high degree of water retention is avoided.
  • Thus, according to the present invention, a flat woven forming fabric of double weave form comprising a face layer of plain weave construction and a back layer joined thereto by binder yarns is characterised in that the warp yarns of the said back layer are of "fine" yarns having a diameter in the range 0.15 to 0.22 mms. woven individually with the weft yarns of the said back layer and extending to the fabric surface and in that the warp yarns of the face and back layers are of substantially the same thickness.
  • According to a preferred feature, the warp and weft yarns of the face layer both comprise "fine" yarns.
  • By "fine" yarns is meant a yarn of a diameter (or the equivalent) commonly used at the paper supporting face of a papermakers fabric, in contradistinction to the "coarse" yarn commonly used at the "machine" side of the fabric. Typically, a "fine" yarn will be, say, 0. 22 mms in diameter, whilst a "coarse" yarn will have a diameter of, say, 0.35 mms.
  • The invention will now be described further by way of example only, with reference to the accompanying diagrammatic drawing illustrating one embodiment thereof.
  • Thus, referring now to the drawing, a forming fabric for a papermaking machine is of double weave construction, and comprises a face layer 11 of plain weave and a back layer 12 defined by a 3 and 1 straight twill.
  • The warp and weft yarns 13, 14 of the face layer are "fine" yarns having diameters of 0.17 mms and 0.18 mms, respectively.
  • The warp yarns 15, of the fabric layer at the roller side are, in the present example, of like diameterto the warp yarns 13 of the face layer, and are present in like number at both faces of the fabric, whilst the weft yarns 16 have a diameter of 0.25 mms.
  • The weft binder yarns 17, two of which yarns are conveniently present in each pattern repeat, are of polyester monofilament of a diameter of 0.12 mms, the warp and weft yarns of both fabric layers similarly being monofilament polyester yarns.
  • In the face layer the weft is woven 24 picks per centimetre whilst in the back layer the corresponding figure is 16 picks per centimetre, there being 8 weft binder yarns per centimetre. There are 63 warp yarns per centimetre, in total.
  • The fabric as aforesaid has a thickness of 0.73 mm.
  • We have found that a wet end fabric constructed as aforesaid is effective in operation, and avoids, in whole or in part, the problem of water-retention inherent in known structures.
  • By way of comparison, a conventional double weave fabric having a "fine" layer of plain weave and a "coarse" back layer comprising a 3 /1 twill, and wherein the diameter of the yarns of the face layer and back layer are respectively 0.17 and 0.25 mms. wherein the warp yarns exist as 26 ends per centimetre and 13 ends per centimetre in the face and back respectively, and wherein the weft direction yarns are present at 30, 15 and 7 picks per centimetre in the face layer, back layer and in the binding layer, has a thickness of 0.82 mms and a materially greater tendency to retain water than has the fabric of the invention.
  • The invention is not limited to the precise detail of the example herein set forth, since alternatives will present themselves to one skilled in the art.
  • Thus, for example, whilst, in the embodiment described, the warp yarns at the back of the fabric are of the same diameter as those in the front, yarns of a different diameter may be preferred in some instances, although in practical terms, substantial differences could not be accommodated. A warp diameter of 0.17 mms at one face is acceptable in combination with a warp diameter of 0.2 mms at the other face, but differences materially in excess of this may well give rise to difficulty. It is thought that, subject to the foregoing, warp yarns of a diameter lying within the range 0.15 to 0.22 mms will be of application in the context of the invention, with a preferred range of from 0.17 to 0.22 mms.
  • Furthermore, as in the embodiment described, the weft yarns in the face and back of the fabric may be of a different diameter from each other and indeed from that of either of the warp yarns.

Claims (7)

1. A flat woven forming fabric of double weave construction comprising a face layer (11) including "fine" yarns and of plain weave construction and a back layer (12) joined thereto by binder yarns (17), characterised in that the warp yarns (15) of the said back layer are "fine" yarns having a diameter in the range 0.15 to 0.22 mms. woven individually with the weft yarns (16) of the said back layer and extending to the fabric surface and in that the warp yarns (13, 15) of the face and back layers are of substantially the same thickness.
2. A fabric as claimed in claim 1, wherein the warp yarns (15) of the back layer (12) of the fabric are equal in number to the warp yarns (13) of the face layer (11).
3. A fabric as claimed in claim 1 or 2, wherein the warp yarns (13, 15) of both fabric layers comprise synthetic monofilament yarns.
4. A fabric as claimed in any one of the preceding claims, wherein the warp and weft yarns comprise polyester yarns.
5. A fabric as claimed in any one of the preceding claims, wherein the binder yarns (17) extend in the weft direction of the fabric.
6. A fabric as claimed in any one of the preceding claims wherein the warp and weft yarns (13, 14) of the face layer (11) both comprise "fine" yarns.
7. A fabric as claimed in any one of the preceding claims, wherein the warp yarns (15) of the back layer have a diameter within the range 0.17 to 0.22 mms.
EP88301956A 1987-03-19 1988-03-07 Improvements in or relating to papermachine and like clothing Expired - Lifetime EP0283181B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88301956T ATE63950T1 (en) 1987-03-19 1988-03-07 PAPER MACHINE FABRIC AND SIMILAR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8706552 1987-03-19
GB878706552A GB8706552D0 (en) 1987-03-19 1987-03-19 Papermachine &c clothing

Publications (2)

Publication Number Publication Date
EP0283181A1 EP0283181A1 (en) 1988-09-21
EP0283181B1 true EP0283181B1 (en) 1991-05-29

Family

ID=10614245

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88301956A Expired - Lifetime EP0283181B1 (en) 1987-03-19 1988-03-07 Improvements in or relating to papermachine and like clothing

Country Status (10)

Country Link
EP (1) EP0283181B1 (en)
JP (1) JPS646193A (en)
AT (1) ATE63950T1 (en)
AU (1) AU605261B2 (en)
DE (1) DE3862963D1 (en)
ES (1) ES2022612B3 (en)
FI (1) FI881292A (en)
GB (2) GB8706552D0 (en)
NO (1) NO881202L (en)
ZA (1) ZA881650B (en)

Cited By (4)

* 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
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
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
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
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
JPH1181174A (en) * 1997-09-05 1999-03-26 Nippon Felt Co Ltd Double woven fabric for papermaking
US6112774A (en) * 1998-06-02 2000-09-05 Weavexx Corporation Double layer papermaker's forming fabric with reduced twinning.
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
JP2003013384A (en) * 2001-06-29 2003-01-15 Nippon Felt Co Ltd Woven fabric for paper manufacture
FI20030983A (en) * 2003-06-30 2004-12-31 Tamfelt Oyj Abp A paper machine fabric

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885602A (en) * 1973-11-21 1975-05-27 Creech Evans S Woven fourdrinier fabric
SE385486B (en) * 1974-10-10 1976-07-05 Nordiska Maskinfilt Ab PROPAGATION WIRE FOR PAPER, CELLULOSE OR SIMILAR MACHINES AND MANUFACTURED THE SAME
US4086941A (en) * 1976-10-26 1978-05-02 Huyck Corporation Biplanar papermaker's belt
CA1110953A (en) * 1978-10-23 1981-10-20 John G. Buchanan Duplex forming fabric
SE435739B (en) * 1983-02-23 1984-10-15 Nordiskafilt Ab DOUBLE TEXTILE TYPE FORMATION WIRES
DE3318990C2 (en) * 1983-05-25 1994-10-20 Oberdorfer F Siebtech Gmbh Multi-layer paper machine screen
DE3318985A1 (en) * 1983-05-25 1984-11-29 Fa. F. Oberdorfer, 7920 Heidenheim Paper machine wire with two superposed fabric plies
SE439651B (en) * 1983-10-25 1985-06-24 Nordiskafilt Ab The forming fabric
FI844125L (en) * 1984-03-26 1985-09-27 Huyck Corp PAPPERSMASKINTYG SOM BESTAOR AV SLITSTARKA TRAODAR.

Cited By (4)

* 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
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
DE3862963D1 (en) 1991-07-04
AU1327188A (en) 1988-09-22
FI881292A0 (en) 1988-03-18
ATE63950T1 (en) 1991-06-15
GB2202869A (en) 1988-10-05
GB8706552D0 (en) 1987-04-23
AU605261B2 (en) 1991-01-10
GB2202869B (en) 1991-01-30
GB8805374D0 (en) 1988-04-07
EP0283181A1 (en) 1988-09-21
NO881202L (en) 1988-09-20
FI881292A (en) 1988-09-20
ES2022612B3 (en) 1991-12-01
ZA881650B (en) 1988-09-06
JPS646193A (en) 1989-01-10
NO881202D0 (en) 1988-03-18

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