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WO2000009800A1 - Toile de base de presse en boucle tissee, avec couche superieure haute densite - Google Patents

Toile de base de presse en boucle tissee, avec couche superieure haute densite Download PDF

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Publication number
WO2000009800A1
WO2000009800A1 PCT/US1999/018029 US9918029W WO0009800A1 WO 2000009800 A1 WO2000009800 A1 WO 2000009800A1 US 9918029 W US9918029 W US 9918029W WO 0009800 A1 WO0009800 A1 WO 0009800A1
Authority
WO
WIPO (PCT)
Prior art keywords
yarns
fabric
cmd
primary
machine direction
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.)
Ceased
Application number
PCT/US1999/018029
Other languages
English (en)
Inventor
Henry J. Lee
Billy Summer
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.)
Asten Inc
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 AU52557/99A priority Critical patent/AU5255799A/en
Publication of WO2000009800A1 publication Critical patent/WO2000009800A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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

Definitions

  • the present invention generally relates to a woven fabric for use in a paper, cellulose or board manufacturing machine that is seamed by interlocking loops along each of two fabric edges to form an endless woven fabric.
  • papermaking machines generally include three sections which are referred to as the forming, press and dryer sections.
  • a felt is generally employed to transport the formed, wet sheet through the press and dryer sections of the papermaking equipment .
  • the felt must be particularly adapted to specific conditions encountered in papermaking.
  • such felts include a supporting base, such as a woven fabric, and a paper carrying or supporting layer fixed to the base.
  • the paper carrying or supporting layer is generally softer and smoother than the base layer.
  • the support layer is often a non-woven batt material which has been affixed to the base and has homogeneous characteristics as to permeability, compaction and drainage. Slight irregularities or imperfections in the support layer are Inconsistencies in the felt thickness, gauge or weight can cause undesirable vibrations during operation of the equipment .
  • the batt material is often anchored to a base fabric which is provided with end loops to join the fabric.
  • Many of these fabrics are woven as endless loops in patterns that provide the seaming loops at each end of the fabric.
  • Standard woven loop base constructions frequently include two layers of weft yarns in a low density, symmetrical construction.
  • these base fabrics typically provide limited batt anchorage and sheet support due to low surface contact area. This necessitates the use of a third, topical laminate structure, having a higher density of weft or warp yarns.
  • the laminate is generally bound to the primary base by means of filament entanglement during a post weaving needling process. This process can be costly and time consuming.
  • Standard endlessly woven loop seam products are made with stacked weft pairs, formed by looping around a forming monofilament .
  • 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. This misalignment creates a seam that is difficult to mesh.
  • Figures 1-3 show representative loop misalignments experienced in common prior art endlessly woven seams.
  • a loom weaves the loops in an endless weave construction, it naturally offsets the returning weft position slightly from its outgoing weft position. It is possible 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 does not have a balancing yarn on one of its sides 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.
  • a similar misalignment of the loops occurs in flat woven fabrics wherein the tie back portion of the warp yarn is offset from the outgoing portion of the warp yarn during loop formation.
  • the present invention combines two high density structures during the weaving process, with the primary base construction being used to form endless type seam loops. This is achieved by means of unique weave patterns that stitch in a higher density weft layer of yarns to provide greater batt anchorage and maintain a stacked weft arrangement in the base for uniform, vertically aligned, loop formation.
  • the present invention generally relates to a papermaker's fabric of a type having a system of primary machine direction yarns which form seaming loops at each end of the fabric.
  • the fabric also includes a system of secondary machine direction yarns and a system of cross- machine direction yarns.
  • the cross-machine direction yarns are interwoven with the primary and secondary systems of machine direction yarns in a weave pattern that provides adjacent balancing yarns that maintain the seam loops in substantially vertical alignment.
  • a method of forming the papermaker's fabric is also provided.
  • 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 fabric according to the present invention.
  • Figure 5 is an end elevation view of a portion of the fabric according to the present invention.
  • Figure 6 is a schematic view showing the weaving progression of the weft yarns.
  • Figure 7 shows a position of the weft yarn after the fabric of Figure 6 is removed from the loom and opened.
  • Figure 8 is a cross section taken along the line 8-8 in Figure 6.
  • Figure 9 is a weave pattern diagram for the preferred embodiment of the base fabric of the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENT
  • the preferred fabric 100 generally comprises a base fabric 110 with batt material 112 attached thereto.
  • the base fabric 110 comprises three layers of machine direction (MD) yarns 114, 116 and 118 interwoven with a system of cross-machine direction (CMD) yarns 120.
  • MD layers 114 and 116 are woven in stacked pairs and form seam loops 122 at each end of the base fabric 110.
  • the third layer MD yarns 118 extend above MD layers 114 and 116 and are substantially parallel thereto. In the preferred embodiment, two third layer MD yarns 118 are provided for every pair of stacked MD yarns 114 and 116.
  • the fabric 110 is preferably endless woven using a two shuttle loom.
  • the first shuttle weaves the lower and intermediate MD layers 114 and 116 and the second shuttle weaves the upper MD layer 118.
  • the base fabric 110 is woven on the loom doubled over upon itself. That is, the base fabric 110 is woven with an upper weaving layer 130 and a lower weaving layer 132 which are opened after weaving as shown in Figure 7 to provide a base fabric 110 which is approximately twice the length of the fabric on the loom. Reference to position of the yarns relative to one another is the relative position after the fabric is opened, unless otherwise specified.
  • the CMD yarns 120 interweave with all three MD yarn layers 114, 116 and 118.
  • the CMD yarns 120 preferably include two CMD subsystems 120a, b.
  • Upper CMD subsystem yarns 120a weave exclusively with the middle and upper MD layers 116 and 118 and the lower CMD subsystem yarns 120b weave exclusively with lower and middle MD layers 114 and 116.
  • the base fabric 110 has a weave which preferably repeats on sixteen (16) CMD yarns and thirty-two (32) MD yarns. As shown in Figure 8, CMD yarns 1, 4, 5, 8, 12, 13 and 16 make up the upper CMD subsystem 120a and CMD yarns 2, 3, 6, 7, 10, 11, 14 and 15 make up the lower CMD yarn subsystem 120b.
  • the upper CMD subsystem yarns 120a weave exclusively with the intermediate and upper layer MD yarns 116 and 118.
  • Each upper subsystem CMD yarn 120a preferably weaves, relative to the intermediate and upper MD layers 116, 118, over two, under four, over two and under four in a given repeat.
  • warp yarn 16 weaves over MD yarns 4 and 5, under MD yarns 8, 12, 13 and 16, over MD yarns 20 and 21, and under MD yarns 24, 28, 29 and 32.
  • the lower CMD subsystem yarns 120b preferably weave in a standard "N" pattern relative to the lower and intermediate MD layers 114, 116.
  • CMD yarn 14 weaves over weft yarns 5 and 6, between MD yarns 13 and 14, under MD yarns 21 and 22, and between MD yarns 29 and 30 in a given repeat.
  • the intermediate MD yarns 116 interweave with both CMD subsystem layers 120a, b, to integrate the fabric.
  • This weave pattern integrates the three MD layers 114, 116, 118 while maintaining the seam loops 122 in substantial vertical alignment. Loop alignment is maintained by the balanced weave of the end upper CMD yarn 120a which counterbalances the unbalanced crimp force of the end lower CMD yarn 120b.
  • the fabric 110 may be flat woven or endless woven.
  • the preferred method of endless weaving the fabric 110 will be described with reference to Figures 6-9.
  • Figure 9 shows a weave pattern diagram for the base fabric 110 wherein the filled boxes indicate where a warp yarn or cord is over a respective weft yarn. Weaving of the fabric will be described with reference to positioning of the cords only, but it will be understood that the warp heddles are positioned for each shuttle pass in accordance with the desired weave pattern.
  • the base fabric 110 is preferably woven using a two shuttle loom. Referring to Figures 6-9, the first shuttle is thrown across the loom with all of the cords LC, RC1, and RC2 lowered. The right cord RC1 is then raised and the first shuttle is thrown back across the loom, thereby looping around the end right cord RC1. This first shuttle pass is depicted as 1 and 2 in Figure 6. The end right cord RC1 remains raised and the second shuttle is thrown across the loom from the side opposite the first shuttle. The three left cords LC, RC1, and RC2 are raised as the second shuttle is thrown back across the loom. This second shuttle pass is depicted as 3 and 4 in Figure 6. The first shuttle then weaves weft yarns 5 and 6.
  • the left cord LC and the inner right cord RC2 are raised and the first shuttle is thrown across the loom. All three cords LC, RCl, and RC2 are raised and the first shuttle is thrown back across the loom, thereby weaving weft yarns 5 and 6 in the lower fabric layer and looping around the end right cord RCl .
  • To weave weft yarn 7 both right cords RCl and RC2 are raised and the second shuttle is thrown across the loom.
  • the left cord LC and the end right cord RCl are raised and the second shuttle is thrown back across the loom to weave weft yarn 8.
  • a turning fold is formed as is known in endless weaving. The shuttles weave in the same pattern across the width of the fabric 110 with the heddles being adjusted to provide the desired weave pattern.
  • the right end cord RCl is removed and the left and inner right cords LC and RC2 are replaced with yarns consistent with the remainder of the warp yarns. Removal of RCl provides the loops 122 at both ends of the fabric.
  • the upper weft yarn passes 3, 4 and 7, 8 will be joined at the loop end of the woven fabric 110 as represented at 150. To facilitate opening of the fabric 110, these weft yarns are cut at 150. It will be understood that various other weaving patterns can be used which will leave these ends separate, thereby eliminating the need for cutting of the upper weft layer yarns.
  • the upper layer MD yarns can be seen in Figure 9

Landscapes

  • Woven Fabrics (AREA)
  • Paper (AREA)

Abstract

Cette invention se rapporte à une toile de machine à papier (100), constituée par un système de fils primaires sens machine (114, 116) formant des boucles de jointure (122) à chaque extrémité de la toile, et par un système de fils secondaires sens machine (118). Un système de fils sens travers (120) est tissé avec les systèmes primaire et secondaire des fils sens machine, selon une configuration de tissage qui place des fils d'équilibrage adjacents maintenant les boucles de jointure (122) en alignement sensiblement vertical.
PCT/US1999/018029 1998-08-11 1999-08-09 Toile de base de presse en boucle tissee, avec couche superieure haute densite Ceased WO2000009800A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU52557/99A AU5255799A (en) 1998-08-11 1999-08-09 Woven loop press base fabric having high density top layer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/132,150 USH1974H1 (en) 1998-08-11 1998-08-11 Woven loop press base fabric having high density top layer
US09/132,150 1998-08-11

Publications (1)

Publication Number Publication Date
WO2000009800A1 true WO2000009800A1 (fr) 2000-02-24

Family

ID=22452720

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/018029 Ceased WO2000009800A1 (fr) 1998-08-11 1999-08-09 Toile de base de presse en boucle tissee, avec couche superieure haute densite

Country Status (4)

Country Link
US (1) USH1974H1 (fr)
AU (1) AU5255799A (fr)
CA (1) CA2247736A1 (fr)
WO (1) WO2000009800A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1925726A1 (fr) * 2006-11-27 2008-05-28 Voith Patent GmbH Bande de couture pour une machine destinée à la fabrication de matériau en bande, en particulier du papier ou du carton

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005034453A1 (de) * 2005-07-23 2007-01-25 Voith Patent Gmbh Verfahren zur Herstellung eines Papiermaschinensiebes
GB2428693A (en) * 2005-08-02 2007-02-07 Brent Swaine Woven papermaking fabric with seam
CN109208389B (zh) 2013-11-14 2021-03-12 Gpcp知识产权控股有限责任公司 确定织物特征的工艺
FI128025B (en) * 2017-03-24 2019-08-15 Valmet Technologies Oy industry Fabric

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262467A1 (fr) * 1986-10-01 1988-04-06 Thomas Josef Heimbach GmbH & Co. Toile pour machine, en particulier feutre ou tamis pour papeterie
WO1992011412A1 (fr) * 1990-12-21 1992-07-09 Nordiskafilt Ab Tissu pour machine a papier ou analogue et procede de fabrication d'un tel tissu
WO1999027181A1 (fr) * 1997-11-24 1999-06-03 Asten, Inc. Base de presse a coutures bouclees/coutures bouclees tissees en forme d'epingle de cravate

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE355389B (fr) 1970-12-31 1973-04-16 Nordiska Maskinfilt Ab
GB1572905A (en) 1976-08-10 1980-08-06 Scapa Porritt Ltd Papermakers fabrics
GB8531540D0 (en) 1985-12-21 1986-02-05 Scapa Porritt Ltd Papermachine &c fabrics
US4824525A (en) * 1987-10-14 1989-04-25 Asten Group, Inc. Papermaking apparatus having a seamed wet press felt
US5913339A (en) * 1997-09-30 1999-06-22 Asten, Inc. Papermaker's fabric seam with improved loop alignment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262467A1 (fr) * 1986-10-01 1988-04-06 Thomas Josef Heimbach GmbH & Co. Toile pour machine, en particulier feutre ou tamis pour papeterie
WO1992011412A1 (fr) * 1990-12-21 1992-07-09 Nordiskafilt Ab Tissu pour machine a papier ou analogue et procede de fabrication d'un tel tissu
WO1999027181A1 (fr) * 1997-11-24 1999-06-03 Asten, Inc. Base de presse a coutures bouclees/coutures bouclees tissees en forme d'epingle de cravate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1925726A1 (fr) * 2006-11-27 2008-05-28 Voith Patent GmbH Bande de couture pour une machine destinée à la fabrication de matériau en bande, en particulier du papier ou du carton
US7600538B2 (en) 2006-11-27 2009-10-13 Voith Patent Gmbh Seam fabric for a machine for producing web material, in particular paper or paperboard

Also Published As

Publication number Publication date
USH1974H1 (en) 2001-07-03
CA2247736A1 (fr) 2000-02-11
AU5255799A (en) 2000-03-06

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