WO1999053135A1 - Multilayer papermaking fabric - Google Patents

Multilayer papermaking fabric Download PDF

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Publication number
WO1999053135A1
WO1999053135A1 PCT/US1999/007447 US9907447W WO9953135A1 WO 1999053135 A1 WO1999053135 A1 WO 1999053135A1 US 9907447 W US9907447 W US 9907447W WO 9953135 A1 WO9953135 A1 WO 9953135A1
Authority
WO
WIPO (PCT)
Prior art keywords
yarns
cmd
yarn
stacked pair
fabric
Prior art date
Application number
PCT/US1999/007447
Other languages
French (fr)
Inventor
Payton T. Crosby
Jeff Clegg
Henry J. Lee
Rachel H. Kramer
Original Assignee
Asten, Inc.
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 Asten, Inc. filed Critical Asten, Inc.
Priority to AU34705/99A priority Critical patent/AU3470599A/en
Publication of WO1999053135A1 publication Critical patent/WO1999053135A1/en

Links

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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
    • Y10T442/3195—Three-dimensional weave [e.g., x-y-z planes, multi-planar warps and/or wefts, etc.]
    • Y10T442/3211—Multi-planar weft layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
    • Y10T442/322—Warp differs from weft

Definitions

  • the present invention generally relates to a woven fabric designed for use in a papermaking machine. More particularly, the present invention relates to a woven fabric for use in a high temperature section of a papermaking machine.
  • a conventional papermaking machine forms a web by depositing a slurry of pulp fibers to be formed into a paper sheet on a traveling forming wire. After initial dewatering on the forming wire, the paper sheet or web is transferred to a press section where the web passes through a number of press nips formed between roll couples. The press nips serve to consolidate the solid ingredients of the paper and at the same time to increase the dewatering of the slurry. Thereafter, the web is transferred to a dryer fabric which passes it over a series of heated dryer drums and possibly through a calendar.
  • Dryer fabrics are generally formed from materials resilient to high temperatures and hydrolytic degradation.
  • the present invention relates to a multilayer papermaking fabric having interwoven machine direction (MD) and cross-machine direction (CMD) yarns.
  • the CMD yarns define at least upper and lower CMD yarn subsets.
  • the subsets are interwoven with the MD yarns in a repeat pattern such that the MD yarns have substantially more interweavings with the upper CMD yarn subset than with the lower CMD yarn subset .
  • the lower subset CMD yarns define machine side floats under at least seven MD yarns and each MD yarn interweaves with only two lower subset CMD yarns in each repeat .
  • Figures 1-4 are weave structure diagrams of the
  • Figure 5 is a weave pattern diagram of the preferred embodiment
  • Figure 6 is a bottom plan view of the preferred fabric.
  • Figure 7-8 are weave structure diagrams of an alternate
  • the preferred fabric 100 is
  • It generally comprises a system of MD yarns 110
  • system includes a lower machine contacting layer 122 and an
  • the upper layer 124 includes pairs of
  • the lower layer 122 includes two
  • the MD yarns 110 preferably weave in a pattern that
  • MD yarn 110a weaves in a standard "N"
  • yarn 1101 stitches under yarns 8 and 21; yarn 110m stitches
  • Each MD yarn 110 weaves with two lower layer 122 CMD yarns
  • the lower layer 122 CMD yarns extend
  • yarns 110 Preferably the yarns in lower layer 122 are
  • monofilament yarns made from PCTA, Amodel or PET.
  • the MD yarns 110 are preferably
  • the fabric 100 can be any material that can be used.
  • the fabric 100 can be any material that can be used.
  • fabric 200 also comprises a system of MD yarns 210 interwoven
  • the CMD yarn system 220 is a system of CMD yarns 220.
  • the upper layer 224 includes pairs of stacked CMD
  • yarns 220 and the lower layer 222 includes two adjacent CMD
  • the MD yarns 210 of fabric 200 weave in a pattern that
  • layer CMD yarns 222 in a given repeat For example, MD yarn
  • the lower layer CMD floats are in a plane lower than the MD yarn 210 machine side knuckles.

Abstract

A multilayer papermaking fabric having interwoven machine direction (MD) and cross-machine direction (CMD) yarns, the CMD yarns defining at least upper and lower CMD yarn subsets which are interwoven with the MD yarns in a repeat pattern such that the MD yarns have substantially more interweavings with the upper CMD yarn subset than with the lower CMD yarn subset. The lower subset CMD yarns define machine side floats under at least seven MD yarns and each MD yarn interweaves with only two lower subset CMD yarns in a given repeat.

Description

MUTILAYER PAPERMAKING FABRIC
BACKGROUND OF INVENTION
Field of the Invention
The present invention generally relates to a woven fabric designed for use in a papermaking machine. More particularly, the present invention relates to a woven fabric for use in a high temperature section of a papermaking machine.
Description of the Prior Art
A conventional papermaking machine forms a web by depositing a slurry of pulp fibers to be formed into a paper sheet on a traveling forming wire. After initial dewatering on the forming wire, the paper sheet or web is transferred to a press section where the web passes through a number of press nips formed between roll couples. The press nips serve to consolidate the solid ingredients of the paper and at the same time to increase the dewatering of the slurry. Thereafter, the web is transferred to a dryer fabric which passes it over a series of heated dryer drums and possibly through a calendar.
Dryer fabrics are generally formed from materials resilient to high temperatures and hydrolytic degradation.
However, these materials are often prone to abrasion. Additionally, the stresses on the machine direction yarns cause fairly rapid wearing of the MD yarns, which shortens the life of the fabric.
Accordingly, there is a need for a fabric which can be formed from temperature and degradation resistant materials with less susceptibility to fabric wear.
SUMMARY OF THE INVENTION
The present invention relates to a multilayer papermaking fabric having interwoven machine direction (MD) and cross-machine direction (CMD) yarns. The CMD yarns define at least upper and lower CMD yarn subsets. The subsets are interwoven with the MD yarns in a repeat pattern such that the MD yarns have substantially more interweavings with the upper CMD yarn subset than with the lower CMD yarn subset . The lower subset CMD yarns define machine side floats under at least seven MD yarns and each MD yarn interweaves with only two lower subset CMD yarns in each repeat .
BRIEF DESCRIPTION OF THE DRAWINGS
Figures 1-4 are weave structure diagrams of the
preferred fabric of the present invention.
Figure 5 is a weave pattern diagram of the preferred
fabric wherein the darkened boxes represent where the MD yarns weave under a respective CMD yarn.
Figure 6 is a bottom plan view of the preferred fabric. Figure 7-8 are weave structure diagrams of an alternate
embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The preferred embodiment will be described with reference to the drawing figures where like numerals represent like elements throughout.
Referring to Figures 1-4, the preferred fabric 100 is
shown. It generally comprises a system of MD yarns 110
interwoven with a system of CMD yarns 120. The CMD yarn
system includes a lower machine contacting layer 122 and an
upper layer 124. The upper layer 124 includes pairs of
stacked CMD yarns 120. The lower layer 122 includes two
adjacent CMD yarns 120 for every stacked pair of yarns in the
upper layer 124.
The MD yarns 110 preferably weave in a pattern that
repeats on sixty-four CMD yarns 120, but each MD yarn 110
weaves with only two CMD yarns of lower layer 122 in a given
repeat. For example, MD yarn 110a weaves in a standard "N"
weave pattern with the upper layer 124 until it weaves under
lower layer 122 CMD yarns 48 and 61. These "stitching
points" at 48 and 61 join the CMD yarns of upper and lower
layers 122 and 124 together. As shown in Figures 1-5, yarn
110b stitches under yarns 20 and 33; yarn 110c stitches under
yarns 12 and 25; yarn llOd stitches under yarns 40 and 53; yarn llOe stitches under yarns 32 and 45; yarn llOf stitches
under yarns 4 and 17; yarn llOg stitches under yarns 9 and
28; yarn llOh stitches under yarns 37 and 56; yarn llOi
stitches under yarns 13 and 64; yarn 110j stitches under
yarns 36 and 49; yarn 110k stitches under yarns 41 and 60;
yarn 1101 stitches under yarns 8 and 21; yarn 110m stitches
under yarns 16 and 29; yarn llOn stitches under yarns 1 and
52; yarn llOo stitches under yarns 44 and 57; and yarn llOp
stitches under yarns 5 and 24.
As shown in Figure 6, the reduced number of stitching
points in the CMD yarns lower layer 122 produces floats that
pass under fifteen of the MD yarns 110 in a given repeat.
Each MD yarn 110 weaves with two lower layer 122 CMD yarns
in a given repeat. These widely spaced interlacings allow the CMD yarns of lower layer 122 to be woven with minimum
crimping. As such, the lower layer 122 CMD yarns extend
below the plane of the MD yarns 110 machine side knuckles.
This produces a machine contacting surface which is dominated by the CMD yarns in lower layer 122 and this protects the MD
yarns 110. Preferably the yarns in lower layer 122 are
monofilament yarns made from PCTA, Amodel or PET.
The CMD yarns of upper layer 124 and the MD yarns 110
can be of various materials . The MD yarns 110 are preferably
made from a material having good tensile strength. Materials
■4- which also provide some temperature resistance, such as polyester or ryton, may be used. The fabric 100 can be
endless woven or flat woven.
Referring to Figures 7-8, an alternate embodiment of the
fabric 200 is shown. Similar to the preferred embodiment,
fabric 200 also comprises a system of MD yarns 210 interwoven
with a system of CMD yarns 220. The CMD yarn system 220
includes a lower machine contacting layer 222 and an upper
layer 224. The upper layer 224 includes pairs of stacked CMD
yarns 220 and the lower layer 222 includes two adjacent CMD
yarns 220 for every stacked pair of yarns in the upper layer
224.
The MD yarns 210 of fabric 200 weave in a pattern that
repeats on thirty-two CMD yarns 220 and weave with two lower
layer CMD yarns 222 in a given repeat. For example, MD yarn
210a weaves between CMD yarns 2 and 3, over CMD yarn 7,
between CMD yarns 10 and 11, under lower layer CMD yarn 16,
between CMD yarns 18 and 19, over CMD yarn 23, between CMD
yarns 26 and 27, and under lower layer CMD yarn 29 in a given
repeat. Again, the lower layer CMD floats are in a plane lower than the MD yarn 210 machine side knuckles.

Claims

CLAIMSWe claim:
1. A multilayer papermaking fabric having interwoven machine direction (MD) and cross-machine direction (CMD) yarns that is characterized by:
CMD yarns defining at least upper and lower CMD yarn subsets that are interwoven with the MD yarns in a repeat pattern such that the MD yarns have substantially more interweavings with the upper CMD yarn subset than with the lower CMD yarn subset and the lower subset CMD yarns define machine side floats under at least seven MD yarns and each MD yarn interweaves with only two lower subset CMD yarns in each repeat .
2. The fabric of claim 1 wherein the lower CMD yarns weave in a pattern which includes a machine side float of at least fifteen MD yarns.
3. The fabric of claim 2 wherein the MD yarns repeat on sixty four CMD yarns.
4. The fabric of claim 2 wherein the upper CMD yarn subset includes pairs of stacked CMD yarns .
5. The fabric of claim 4 wherein the lower CMD yarn subset includes two adjacent CMD yarns for each stacked pair of upper subset CMD yarns .
6. The fabric of claim 5 wherein each MD yarn weaves over an upper CMD yarn stacked pair, between an upper CMD yarn stacked pair, under a lower CMD yarn, between an upper CMD yarn stacked pair, over an upper CMD yarn stacked pair, between an upper CMD yarn stacked pair, under a lower CMD yarn, between an upper CMD yarn stacked pair, over an upper CMD yarn stacked pair, between an upper CMD yarn stacked pair, under an upper CMD yarn stacked pair, between an upper CMD yarn stacked pair, over an upper CMD yarn stacked pair, between an upper CMD yarn stacked pair, under an upper CMD yarn stacked pair, and between an upper CMD yarn stacked pair in a given repeat .
7. The fabric of claim 1 wherein the lower subset CMD yarns are monofilament yarns made from a material selected from the group consisting of PCTA, Amodel, and PET.
8. The fabric of claim 1 wherein the MD yarns are warp yarns and the CMD yarns are weft yarns .
9. The fabric of claim 1 wherein the MD yarns are weft yarns and the CMD yarns are warp yarns .
10. The fabric of claim 1 wherein the MD yarns repeat on thirty two CMD yarns .
11. The fabric of claim 1 wherein the upper CMD yarn subset includes pairs of stacked CMD yarns.
-7-
12. The fabric of claim 11 wherein the lower CMD yarn subset includes two adjacent CMD yarns for each stacked pair of upper subset CMD yarns .
13. The fabric of claim 12 wherein each MD yarn weaves over an upper CMD yarn stacked pair, between an upper CMD yarn stacked pair, under a lower CMD yarn, between an upper CMD yarn stacked pair, over an upper CMD yarn stacked pair, between an upper CMD yarn stacked pair, under a lower CMD yarn, and between an upper CMD yarn stacked pair in a given repeat .
PCT/US1999/007447 1998-04-14 1999-04-05 Multilayer papermaking fabric WO1999053135A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU34705/99A AU3470599A (en) 1998-04-14 1999-04-05 Multilayer papermaking fabric

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US8166198P 1998-04-14 1998-04-14
US60/081,661 1998-04-14
US09/191,900 1998-11-13
US09/191,900 US6158478A (en) 1998-04-14 1998-11-13 Wear resistant design for high temperature papermachine applications

Publications (1)

Publication Number Publication Date
WO1999053135A1 true WO1999053135A1 (en) 1999-10-21

Family

ID=26765809

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/007447 WO1999053135A1 (en) 1998-04-14 1999-04-05 Multilayer papermaking fabric

Country Status (4)

Country Link
US (1) US6158478A (en)
AU (1) AU3470599A (en)
CA (1) CA2261005A1 (en)
WO (1) WO1999053135A1 (en)

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DE19859582A1 (en) * 1998-12-22 2000-06-29 Voith Fabrics Heidenheim Gmbh Three or multi-layer paper machine screen in the form of a composite fabric
GB9924012D0 (en) * 1999-10-12 1999-12-15 Stone Richard Forming fabric woven with warp triplets
US6244306B1 (en) * 2000-05-26 2001-06-12 Weavexx Corporation Papermaker's forming fabric
US6745797B2 (en) 2001-06-21 2004-06-08 Weavexx Corporation Papermaker's forming fabric
GB0221643D0 (en) * 2002-09-18 2002-10-30 Voith Fabrics Heidenheim Gmbh Papermachine clothing with wear-resistant weave
US7048012B2 (en) * 2002-10-24 2006-05-23 Albany International Corp. Paired warp triple layer forming fabrics with optimum sheet building characteristics
US6834684B2 (en) * 2002-10-24 2004-12-28 Albany International Corp. Paired warp triple layer forming fabrics with optimum sheet building characteristics
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
US7059357B2 (en) 2003-03-19 2006-06-13 Weavexx Corporation Warp-stitched multilayer papermaker's fabrics
US6896009B2 (en) 2003-03-19 2005-05-24 Weavexx Corporation Machine direction yarn stitched triple layer papermaker's forming fabrics
US7415993B2 (en) * 2003-06-10 2008-08-26 Voith Patent Gmbh Fabrics with multi-segment, paired, interchanging yarns
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
US7198067B2 (en) * 2004-08-04 2007-04-03 Albany International Corp. Warp-runner triple layer fabric with paired intrinsic warp binders
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
WO2008073301A2 (en) * 2006-12-08 2008-06-19 Astenjohnson, Inc. Machine side layer weave design for composite forming fabrics
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
US20090183795A1 (en) 2008-01-23 2009-07-23 Kevin John Ward 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

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WO1987004198A1 (en) * 1986-01-08 1987-07-16 Huyck Corporation Sixteen harness dual layer weave
WO1991017292A1 (en) * 1990-05-08 1991-11-14 Hutter & Schrantz Ag Woven fabric made of synthetic monofilaments for use as a dewatering screen in a paper-manufacturing machine
US5555917A (en) * 1995-08-11 1996-09-17 Wangner Systems Corporation Sixteen harness multi-layer forming fabric

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Publication number Priority date Publication date Assignee Title
US5975149A (en) * 1998-08-11 1999-11-02 Asten, Inc. Multilayer press fabric including long floats of high temperature MD yarns in the paper support layer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987004198A1 (en) * 1986-01-08 1987-07-16 Huyck Corporation Sixteen harness dual layer weave
WO1991017292A1 (en) * 1990-05-08 1991-11-14 Hutter & Schrantz Ag Woven fabric made of synthetic monofilaments for use as a dewatering screen in a paper-manufacturing machine
US5555917A (en) * 1995-08-11 1996-09-17 Wangner Systems Corporation Sixteen harness multi-layer forming fabric

Also Published As

Publication number Publication date
AU3470599A (en) 1999-11-01
US6158478A (en) 2000-12-12
CA2261005A1 (en) 1999-10-14

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