WO1999027181A1 - Loop/tie-back woven loop seam press base - Google Patents

Loop/tie-back woven loop seam press base Download PDF

Info

Publication number
WO1999027181A1
WO1999027181A1 PCT/US1998/005933 US9805933W WO9927181A1 WO 1999027181 A1 WO1999027181 A1 WO 1999027181A1 US 9805933 W US9805933 W US 9805933W WO 9927181 A1 WO9927181 A1 WO 9927181A1
Authority
WO
WIPO (PCT)
Prior art keywords
fabric
yarns
edge
longitudinal
loops
Prior art date
Application number
PCT/US1998/005933
Other languages
French (fr)
Inventor
Henry J. Lee
Billy Summer
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 AU67759/98A priority Critical patent/AU6775998A/en
Publication of WO1999027181A1 publication Critical patent/WO1999027181A1/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
    • D21F1/0054—Seams thereof
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/904—Paper making and fiber liberation with specified seam structure of papermaking belt
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/19—Sheets or webs edge spliced or joined
    • Y10T428/192—Sheets or webs coplanar
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24777—Edge feature
    • Y10T428/24785—Edge feature including layer embodying mechanically interengaged strands, strand portions or strand-like strips [e.g., weave, knit, etc.]
    • 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]
    • Y10T442/3325—Including a foamed layer or component
    • Y10T442/335—Plural fabric layers
    • Y10T442/3358—Including a nonwoven fabric layer
    • 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]
    • Y10T442/3707—Woven fabric including a nonwoven fabric layer other than paper
    • Y10T442/3724—Needled

Definitions

  • the present invention generally relates to a woven fabric which is designed for use in a papermaking, cellulose or board manufacturing machine and which along each end has a plurality of loops to be included in a loop seam to form an endless woven fabric .
  • papermaking machines generally include three sections which are generally referred to as the formation, press and dryer sections.
  • the present invention finds particular application in papermaker's felts which are employed in the press section of a papermaking machine.
  • such felts include a supporting base, and a paper carrying or supporting layer fixed to the base.
  • the base fabric is a woven fabric which is used as an endless belt .
  • the woven fabric may be woven as an endless loop and utilized as such so there is no seam or, alternatively, the fabric may be woven to have two ends which are joined at a seam to form the endless loop.
  • Various seams are known in the art, including pin type seams which utilize a joining wire or pintle which is inserted through seam loops at each end of the fabric to render it endless.
  • SUBSTITUTE SHEET ruie 26 One technique of forming a fabric having seam loops is to provide an endless weave wherein loops are formed by weaving stacked weft yarns around a forming wire, as shown in U.S. Patent No. 3,815,645. A common problem associated with this type of loop formation is non-uniform loop alignment, both in the vertical and horizontal axis, when the forming wire is removed. The misalignment creates a seam that is difficult to mesh.
  • Figures 1-3 show representative loop misalignments experienced in common prior art endless woven seams.
  • the last warp yarn 2 is generally not balanced by adjacent yarns on each side and therefore, an unbalanced crimp force is applied to the weft yarns in the loop area, as shown by the arrows in Figure 2.
  • the two weft yarn passes which form each loop are not balanced by warps and the loops tend to be misaligned.
  • Another problem associated with standard seams is that the seam area has a yarn density twice that of the body since each meshed seam half has a density similar to the body.
  • the present invention provides an open ended papermaker's fabric having a system of transverse yarns interwoven with a system of longitudinal yarns . Select longitudinal yarns at each end of the fabric are woven to form seam loops while other longitudinal yarns at each end of the fabric are woven around a yarn of the transverse yarn system to form integral edge tiebacks .
  • Figure 1 is a top plan view of prior art end loops.
  • Figure 2 is an elevation view of the prior art end loops along the line 2-2 in Figure 1.
  • Figure 3 is a side elevation view of the prior art end loops along the line 3-3 in Figure 1.
  • Figure 4 is a schematic perspective view of a portion of the base fabric according to the present invention.
  • Figure 5 is a side elevation view of a portion of the base fabric taken along line 5-5 in Figure 4.
  • Figure 6 is a front elevation view of a portion of the base fabric.
  • Figure 7 is a top plan view of two end portions of the fabric joined together.
  • the base fabric 1 comprises a MD top layer 10-17 and a MD bottom layer 20-27 interwoven with CMD yarns 2-5.
  • the CMD yarns 2-5 are woven in a repeated pattern where each CMD yarn 2-5 passes over, between, under, between with respect to the two layers of MD yarns. Every other MD top layer yarn 10, 12, 14, 16 is joined with the corresponding MD bottom layer yarn 20, 22, 24, 26 to form seam loops 30, 32, 34, 36 respectively.
  • the remaining MD top layer yarns 11, 13, 15, 17 are joined with the corresponding MD bottom layer yarns 21, 23, 25, 27 to form integral fabric edge tiebacks 31, 33, 35, 37 respectively.
  • the integral fabric edge tiebacks 31, 33, 35, 37 wrap around the end warp yarn 2, thereby forming an integral fabric edge or tieback inside the loop area.
  • the seam loops 30, 32, 34, 36 are preferably formed by weaving the respective MD yarns around a forming wire which is removed after weaving.
  • the forming wire is shedded to a non-weaving position and the respective MD yarns are woven around the end CMD yarn 2.
  • the opposite ends 40, 40' of the fabric are formed such that the seam loops 30, 32, 34, 36 of one end complement the integral fabric edge loops 31', 33', 35', 37' of the opposite end and vice versa.
  • the vertical and horizontal alignment of the seam loops 30, 32, 34, 36 and 30', 32', 34', 36' allows the respective ends 40, 40' of the fabric to be intermeshed more efficiently and the pintle inserted more easily.
  • Another advantage of the preferred configuration is that the machine direction yarn density in the seam zone is similar to that of the body.
  • the number of seam loops aligned in the seam zone when the ends of the fabric are joined is essentially equal to the number of machine direction yarns across the entire fabric. This produces a more uniform permeability and flow profile in the fabric seam area.
  • batt material 50 may be applied to one or both surfaces of the base fabric 1 as desired.

Abstract

An open ended papermaker's fabric having a system of transverse yarns (2-5) interwoven with a system of longitudinal yarns (10-17, 20-27) wherein the longitudinal yarns form seam loops (30, 32, 34, 36) and integral edge tie-backs (31, 33, 35, 37) at each end of the fabric.

Description

LOOP/TIE-BACK WOVEN LOOP SEAM PRESS BASE BACKGROUND OF THE INVENTION
Field of the Invention
The present invention generally relates to a woven fabric which is designed for use in a papermaking, cellulose or board manufacturing machine and which along each end has a plurality of loops to be included in a loop seam to form an endless woven fabric .
Description of the Prior Art As will be known to those skilled in the art, papermaking machines generally include three sections which are generally referred to as the formation, press and dryer sections. The present invention finds particular application in papermaker's felts which are employed in the press section of a papermaking machine.
Typically, such felts include a supporting base, and a paper carrying or supporting layer fixed to the base. Frequently, the base fabric is a woven fabric which is used as an endless belt . The woven fabric may be woven as an endless loop and utilized as such so there is no seam or, alternatively, the fabric may be woven to have two ends which are joined at a seam to form the endless loop. Various seams are known in the art, including pin type seams which utilize a joining wire or pintle which is inserted through seam loops at each end of the fabric to render it endless.
SUBSTITUTE SHEET ruie 26 One technique of forming a fabric having seam loops is to provide an endless weave wherein loops are formed by weaving stacked weft yarns around a forming wire, as shown in U.S. Patent No. 3,815,645. A common problem associated with this type of loop formation is non-uniform loop alignment, both in the vertical and horizontal axis, when the forming wire is removed. The misalignment creates a seam that is difficult to mesh.
Figures 1-3 show representative loop misalignments experienced in common prior art endless woven seams. Generally, as a loom weaves the loops in an endless weave, it naturally offsets the returning weft position slightly from its outgoing weft position. Therefore, it is necessary to maintain the weft yarns in a stacked relationship throughout the fabric through the balanced weave of the warp yarns. The last warp yarn 2, however, is generally not balanced by adjacent yarns on each side and therefore, an unbalanced crimp force is applied to the weft yarns in the loop area, as shown by the arrows in Figure 2. As a result, the two weft yarn passes which form each loop are not balanced by warps and the loops tend to be misaligned. Another problem associated with standard seams is that the seam area has a yarn density twice that of the body since each meshed seam half has a density similar to the body.
Accordingly, it is desired to provide a base fabric having seam loops which are* easier to intermesh and more uniform fabric characteristics in the seam area. SUMMARY OF THE INVENTION
The present invention provides an open ended papermaker's fabric having a system of transverse yarns interwoven with a system of longitudinal yarns . Select longitudinal yarns at each end of the fabric are woven to form seam loops while other longitudinal yarns at each end of the fabric are woven around a yarn of the transverse yarn system to form integral edge tiebacks .
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a top plan view of prior art end loops.
Figure 2 is an elevation view of the prior art end loops along the line 2-2 in Figure 1.
Figure 3 is a side elevation view of the prior art end loops along the line 3-3 in Figure 1. Figure 4 is a schematic perspective view of a portion of the base fabric according to the present invention.
Figure 5 is a side elevation view of a portion of the base fabric taken along line 5-5 in Figure 4.
Figure 6 is a front elevation view of a portion of the base fabric.
Figure 7 is a top plan view of two end portions of the fabric joined together.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment will be described with reference to the drawing figures where like numerals represent like elements throughout . Referring to Figure 4, it shows a portion of the base fabric 1 in accordance with the present invention. In the preferred embodiment, the base fabric 1 comprises a MD top layer 10-17 and a MD bottom layer 20-27 interwoven with CMD yarns 2-5. The CMD yarns 2-5 are woven in a repeated pattern where each CMD yarn 2-5 passes over, between, under, between with respect to the two layers of MD yarns. Every other MD top layer yarn 10, 12, 14, 16 is joined with the corresponding MD bottom layer yarn 20, 22, 24, 26 to form seam loops 30, 32, 34, 36 respectively. The remaining MD top layer yarns 11, 13, 15, 17 are joined with the corresponding MD bottom layer yarns 21, 23, 25, 27 to form integral fabric edge tiebacks 31, 33, 35, 37 respectively. The integral fabric edge tiebacks 31, 33, 35, 37 wrap around the end warp yarn 2, thereby forming an integral fabric edge or tieback inside the loop area.
The seam loops 30, 32, 34, 36 are preferably formed by weaving the respective MD yarns around a forming wire which is removed after weaving. To form the integral tiebacks, the forming wire is shedded to a non-weaving position and the respective MD yarns are woven around the end CMD yarn 2.
Because the integral fabric edge tiebacks balance the crimp force of the end warps 2 and 3, the crimp force applied to the seam loops 30, 32, 34, 36 is reduced. As a result, the seam loops 30, 32, 34, 36 are maintained in better vertical and horizontal alignment, as shown in Figures 5 and 6.
As shown in Figure 7, the opposite ends 40, 40' of the fabric are formed such that the seam loops 30, 32, 34, 36 of one end complement the integral fabric edge loops 31', 33', 35', 37' of the opposite end and vice versa. The vertical and horizontal alignment of the seam loops 30, 32, 34, 36 and 30', 32', 34', 36' allows the respective ends 40, 40' of the fabric to be intermeshed more efficiently and the pintle inserted more easily. Another advantage of the preferred configuration is that the machine direction yarn density in the seam zone is similar to that of the body. Since the seam loops at one end align with the edge tiebacks of the other end, and vice versa, the number of seam loops aligned in the seam zone when the ends of the fabric are joined is essentially equal to the number of machine direction yarns across the entire fabric. This produces a more uniform permeability and flow profile in the fabric seam area.
As shown in Figure 7, batt material 50 may be applied to one or both surfaces of the base fabric 1 as desired.

Claims

CLAIMSWe claim:
1. An opened ended, endless woven papermaker's fabric having a plurality of longitudinal yarns and a plurality of transverse yarns woven in a selected weave pattern to form a fabric body and seaming loops, the fabric characterized by a longitudinal yarn weave repeat having selected yarns woven as the seaming loops and selected yarns woven in the fabric body and defining a fabric edge.
2. The fabric of claim 1 wherein the seaming loops alternate with the fabric edge yarns in a 1 to 1 ratio.
3. The fabric of claim 1 wherein the seaming loops of each end of the fabric is aligned with the fabric edge yarns of the opposite end of the fabric when the ends of the fabric are seamed.
4. The fabric of claim 1 having a batt material anchored thereto.
5. A method of forming an open ended papermaker's fabric having integral seam loops and edge tiebacks comprising the steps of: providing a system of transverse yarns interwoven with a system of longitudinal yarns; weaving select longitudinal yarns at each end of the fabric around a forming wire to form seam loops ; and weaving select longitudinal yarns at each end of the fabric around a yarn of the transverse yarn system at each end of the fabric to form integral edge tiebacks.
AMENDED CLAIMS
[received by the International Bureau on 04 February 1999 (04.02.99); original claims 1 and 5 amended;new claim 6 added ; remaining claims unchanged (2 pages)
1. An opened ended, endless woven papermaker's fabric having a plurality of longitudinal yarns and a plurality of transverse yarns woven in a selected weave pattern to form a fabric body and seaming loops, the fabric characterized by a longitudinal yarn weave repeat having selected yarns woven as the seaming loops and selected yarns woven in the fabric body and defining a fabric edge whereby all of the longitudinal yarns define at least an upper planar surface and the longitudinal yarns forming the seaming loops are maintained in a generally stacked configuration.
2. The fabric of claim 1 wherein the seaming loops alternate with the fabric edge yarns in a 1 to 1 ratio.
3. The fabric of claim 1 wherein the seaming loops of each end of the fabric is aligned with the fabric edge yarns of the opposite end of the fabric when the ends of the fabric are seamed.
4. The fabric of claim 1 having a batt material anchored thereto .
5. A method of forming an open ended papermaker's fabric having integral seam loops and edge tiebacks comprising the steps of: providing a system of transverse yarns interwoven with a system of longitudinal yarns; selectively shedding a forming wire during interweaving of the longitudinal yarns to form seam loops and integral edge tiebacks at each end of the fabric with a single shuttle, whereby the longitudinal yarns forming the seaming loops are maintained in a generally stacked configuration.
6. An opened ended, endless woven papermaker's fabric comprising a plurality of machine direction (MD) yarns, including first MD layer portions stacked over second MD yarn layer portions, and a plurality of cross machine direction (CMD) yarns interwoven with portions of the MD yarns in both MD layers, the fabric characterized by: selected MD yarns interwoven with the CMD yarns to define seaming loops and selected MD yarns interwoven with the CMD yarns to form integral edge tiebacks which assist in maintaining the seaming loops in a generally stacked configuration.
PCT/US1998/005933 1997-11-24 1998-03-24 Loop/tie-back woven loop seam press base WO1999027181A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU67759/98A AU6775998A (en) 1997-11-24 1998-03-24 Loop/tie-back woven loop seam press base

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/976,885 1997-11-24
US08/976,885 US6079454A (en) 1997-11-24 1997-11-24 Loop/tie-back woven loop seam press base

Publications (1)

Publication Number Publication Date
WO1999027181A1 true WO1999027181A1 (en) 1999-06-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/005933 WO1999027181A1 (en) 1997-11-24 1998-03-24 Loop/tie-back woven loop seam press base

Country Status (4)

Country Link
US (1) US6079454A (en)
AU (1) AU6775998A (en)
CA (1) CA2230117A1 (en)
WO (1) WO1999027181A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000009800A1 (en) * 1998-08-11 2000-02-24 Asten, Inc. Woven loop press base fabric having high density top layer
EP1790772A1 (en) * 2005-11-25 2007-05-30 Voith Patent GmbH Woven fabric structure
IT202100007658A1 (en) * 2021-03-29 2022-09-29 Feltri Marone S P A PAPERMAKING FABRIC

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US6273147B1 (en) * 1998-08-31 2001-08-14 Astenjohnson, Inc. Papermaking fabric seam with additional threads in the seam area
FR2789702B1 (en) * 1999-02-16 2001-03-30 Cofpa SYMMETRICAL WEAVE JUNCTION FOR ASYMMETRIC WEAVE WEBBAND
JP3870289B2 (en) * 2002-02-25 2007-01-17 イチカワ株式会社 Ended base member for press felt for papermaking and press felt for papermaking
US7032625B2 (en) * 2003-06-24 2006-04-25 Albany International Corp. Multi-layer papermaking fabrics having a single or double layer weave over the seam
ATE467718T1 (en) * 2004-03-19 2010-05-15 Astenjohnson Inc DRY SEAMING
US7691139B2 (en) * 2004-12-28 2010-04-06 Cook Incorporated Unidirectional delivery system
GB2428693A (en) * 2005-08-02 2007-02-07 Brent Swaine Woven papermaking fabric with seam
GB2432337A (en) * 2005-11-22 2007-05-23 Marc Pierre Despault Offset intermeshing industrial fabric seam
DE102006055824A1 (en) * 2006-11-27 2008-05-29 Voith Patent Gmbh Suture strip for a machine for producing web material, in particular paper or cardboard
US8353252B1 (en) * 2011-12-05 2013-01-15 Voith Patent Gmbh Process for preparing a seam area for a PMC base fabric
US8573125B1 (en) * 2012-07-13 2013-11-05 Blast Control Systems, L.L.C. Blast control blanket
WO2017023995A1 (en) * 2015-08-05 2017-02-09 Huyck Licensco, Inc. Pin seamed press felt with base fabric with monofilament and cabled md yarns
WO2018222633A1 (en) * 2017-05-31 2018-12-06 Huyck Licensco Inc. Pin seamed press felt and method of making same

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US4095622A (en) * 1975-11-27 1978-06-20 Jwi Ltd. Woven seam in fabric and method of making same
US4103717A (en) * 1976-06-18 1978-08-01 William Kenyon & Sons, Inc. Seam webbing
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Publication number Priority date Publication date Assignee Title
WO2000009800A1 (en) * 1998-08-11 2000-02-24 Asten, Inc. Woven loop press base fabric having high density top layer
USH1974H1 (en) * 1998-08-11 2001-07-03 Astenjohnson, Inc. Woven loop press base fabric having high density top layer
EP1790772A1 (en) * 2005-11-25 2007-05-30 Voith Patent GmbH Woven fabric structure
IT202100007658A1 (en) * 2021-03-29 2022-09-29 Feltri Marone S P A PAPERMAKING FABRIC
EP4067569A1 (en) * 2021-03-29 2022-10-05 FELTRI MARONE S.p.A. Papermaking fabric

Also Published As

Publication number Publication date
CA2230117A1 (en) 1999-05-24
AU6775998A (en) 1999-06-15
US6079454A (en) 2000-06-27

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