EP1790772A1 - Gewebestruktur - Google Patents

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Publication number
EP1790772A1
EP1790772A1 EP06122252A EP06122252A EP1790772A1 EP 1790772 A1 EP1790772 A1 EP 1790772A1 EP 06122252 A EP06122252 A EP 06122252A EP 06122252 A EP06122252 A EP 06122252A EP 1790772 A1 EP1790772 A1 EP 1790772A1
Authority
EP
European Patent Office
Prior art keywords
seam
yarns
woven fabric
warp
seam loops
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.)
Withdrawn
Application number
EP06122252A
Other languages
English (en)
French (fr)
Inventor
Mark Hodson
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1790772A1 publication Critical patent/EP1790772A1/de
Withdrawn legal-status Critical Current

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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
    • D21F1/0054—Seams thereof
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D3/00—Woven fabrics characterised by their shape
    • D03D3/04—Endless fabrics

Definitions

  • the present invention relates to a woven fabric structure comprising at least one array of warp yarns interwoven with an array at least one array of substantially orthogonally extending weft yarns, wherein each end of a warp yarn is extended beyond the last weft yarn to form either a binder or a seam loop which can be interdigitated with similar seam loops of the opposing fabric end and joined by at least one pintle wire passed through a tunnel formed by the interdigitated seam loops.
  • the woven fabric is preferably for papermachine clothing, such as a forming fabric, a press sleeve, an extended nip press belt, a dryer fabric, a base cloth, for a filter belt or for a conveyor belt.
  • a common form of seam is achieved by extending selected longitudinal (machine direction) warp yarns of the fabric beyond the last transverse (cross-machine direction) weft yarn to form a loop, the end of which is back-woven into the fabric.
  • the non-selected machine direction warp yarns are looped about the last cross-direction weft yarn the end of which is woven and the end back-woven into the fabric.
  • Such a fabric structure is described in the British Patent Application GB-A-1,488,815 , which discloses two patterns of weaving back the looped yarns and cutting short of certain other machine direction yarns to provide space fort he back woven loop ends.
  • All warp yarns have usually the same thickness or width, so that as a result when using only half the warp yarns to form the loops, to afford space for interdigitation of the corresponding loops of the opposite end of the fabric, the tensile strength of the seam is significantly less than the fabric strength and there is a higher propensity in the seam region for marking the material sheet due to the greater open area in the seam region, as about 50 % of the total width of the fabric is open space.
  • One approach of solving this problem is to use more than 50 % of the warp yarns to form loops.
  • An example of this is the International Patent Application WO 92/17543 A1 wherein the problem of obtaining space for interdigitation of loops where more than 50 % space is used by the loops of each side, is tackled by crossing adjacent loops over each other.
  • the use of more than 50 % warp yarns and the crossing of the looped yarns make the already complicated, prolonged and expensive seaming process even more protracted.
  • the European Patent Specification EP 1 070 164 B1 discloses a woven fabric structure comprising an array of warp yarns interwoven with an array of substantially orthogonally extending weft yarns using warp yarns of differing widths.
  • the warp yarns comprise groups of relatively wide warp yarns and groups of relatively thin warp yarns, said groups of relatively wide warp yarns alternating with said groups of relatively thin warp yarns.
  • the groups of relatively wide and relatively thin warp yarns each comprise two or more respectively wide or thin warp yarns and said relatively wide warp yarns are extended in a seam region to provide seaming loops on each end of the fabric.
  • the disadvantage of this woven fabric structure is that warp yarns of different size can produce an uneven fabric surface leading to marking of the material sheet.
  • this object is satisfied by the provision that the seam loops and the binders of the warp yarns possess a ratio above 1:1 and below 4:1.
  • This inventive ratio provides a woven fabric structure with an improved tensile strength, a lower open space and a reduced propensity in the seam region.
  • the ratio of the seam loops to the binders is preferably 3:1, 2:1 or 3:2.
  • the ratio of "3:1" means three seam loops, one binder, three seam loops, one binder, three seam loops, etc.
  • the ratio of "2:1” means two seam loops, one binder, two seam loops, one binder, two seam loops, etc.
  • the ratio of "3:2” means either two seam loops, one binder, one seam loop, one binder, two seam loops, two seam loops, one binder, one seam loop, one binder, two seam loops, etc. or three seam loops, two binders, three seam loops, two binders, three seam loops, two binders, three seam loops, etc.
  • the warp yarns for the seam loops are flat or profiled yarns with overall dimensions between 0,25 and 1,00 mm in height and between 0,50 and 2,00 mm in width or they are round yarns with a diameter between 0,25 and 1,00 mm.
  • the warp yarns are preferably of a circular, rectangular or other profile shaped cross-section.
  • the other profile shaped cross-section will preferably have the shape of a triangle, semicircle, hexgon, octogon or parallelegram.
  • the warp yarn in a preferred embodiment of the invention has a cross-sectional area between 0,125 and 2,00 mm 2 for the flat or profiled yarns and between 0,05 and 0,79 mm 2 for the round yarns. These ranges guarantee a reduced propensity of the woven fabric structure and, therefore, a reduced marking of the material sheet.
  • the material sheet is preferably a paper, board or tissue sheet.
  • the warp yarns and the weft yarns have preferably the same or similarly the same or different shapes and cross-sectional areas.
  • the invention further provides papermachine clothing formed by seaming a woven fabric structure according to the invention.
  • a woven fabric structure for a papermachine clothing or another belt, such as an filter or conveyor belt comprises an array of cross-machine direction weft yarns 10, extending parallel to an edge of the fabric 1, and including a last weft yarn 10a, defining the edge.
  • An array of warp yarns 12 is woven through the weft yarns 10 substantially orthogonally to the weft yarns 10 of and in machine direction of the fabric 1.
  • Figure 1 shows a fragmentary enlarged detail view of part of a seam region of a woven fabric 1, that a normal loop seam is made by reweaving the first machine direction warp yarn 12.1 back into the fabric 1 to form a loop 14.
  • the second machine direction warp yarn (12.2 is not visible) is brought out of the fabric within the seam area. This leaves a space for the first machine direction warp yarn to replace the pathway of the second machine direction warp yarn.
  • the third machine direction warp yarn 12.3 is then rewoven back into the fabric to form a binder by replacing the path of the fourth machine direction warp yarn. The process is repeated so that 50% of the seam is comprised of loops 14 and 50% of the seam is comprised of binders 16.
  • seam loops 14 and the binders 16 are interdigitated with similar seam loops 14 of the opposing fabric end and joined by a pintle wire 18 passed through a tunnel 20 formed by the interdigitated seam loops 14.
  • a spiral is preferably used in connecting the seam loops of the two opposing fabric ends of a dryer fabric.
  • some designs of fabrics 1 have two layers A, B of thin machine direction warp yarns 22.
  • the seam loops 24 are made by reweaving one machine direction warp yarn 22.1 of the first layer A back into the fabric 1 to form a seam loop 24 by replacing the path of the second machine direction warp yarn 22.2 of the second layer B.
  • the third machine direction warp yarn 22.3 is then rewoven back into the fabric 1 of the first layer A to form a binder 26 by replacing the path of the fourth machine direction warp yarn 22.4 of the second layer B.
  • the process is repeated so that 50 % of the seam is comprised of seam loops 24 and 50 % of the seam is comprised as binders 26.
  • a fabric 1 of this design is disclosed in the European Patent Specification EP 0 612 881 B1 .
  • Figure 4 shows another fragmentary enlarged detail view of part of a seam region of a woven fabric 1, showing part of the weave structure of the fabric 1 of the seam formation.
  • the seam loops 44 and the binders 46 of the warp yarns 42 possess a ratio R of 1:1, e.g. one seam loop 44, one binder 46, one seam loop 44, one binder 46, one seam loop 44, etc.
  • the warp yarns 42 for the seam loops 44 are either flat or profiled yarns with overall dimensions between 0,25 and 1,00 mm in height and between 0,50 and 2,00 mm in width or they are round yarns with a diameter between 0,25 and 1,00 mm.
  • a practical embodiment will have over 48 seam loops 44 a width of 100 mm and 11.52 mm 2 cross-sectional area F in total.
  • Each fabrics 1 comprises an array of cross-machine direction weft yarns 100, extending parallel to an edge of the fabric 1, and including a last weft yarn 100a, defining the edge.
  • An array of warp yarns 102 is woven through the weft yarns 100 substantially orthogonally to the weft yarns 100 of and in machine direction of the fabric 1.
  • Each end of a warp yarn 102 is extended beyond the last weft yarn 100a to form either a binder 106 or a seam loop 104 which can be interdigitated with similar seam loops 104 of the opposing fabric end and joined by a pintle wire 108 passed through a tunnel 110 formed by the interdigitated seam loops 104.
  • the seam loops 104 and the binders 106 of the warp yarns 102 possess a ratio R above 1:1 and below 4:1.
  • the ratio R can be 2:1 as shown in Figure 5 or 3:2 as shown in Figures 6 and 7.
  • the warp yarns 102 have two seam loops 104, one binder 106, two seam loops 104, one binder 106, two seam loops 104, etc.
  • the warp yarns 102 have three seam loops 104, two binders 106, three seam loops 104, two binders 106, three seam loops 104, etc. or three seam loops, two binders, three seam loops, two binders, three seam loops, etc.
  • These two preferred ratii provide highly improved tensile strengths with significant lower open spaces. The propensity in the seam region is consequently reduced.
  • the warp yarns 102 for the seam loops 104 are either flat or profiled yarns with overall dimensions between 0,25 and 1,00 mm in height and between 0,50 and 2,00 mm in width or are round yarns with a diameter between 0,25 and 1,00 mm.
  • the warp yarns 102 of both embodiments are of a circular, rectangular or other profile shaped cross-section C and have a cross-sectional area F between 0,125 and 2,00 mm 2 for the flat or profiled yarns and between 0,05 and 0,79 mm 2 for the round yarns.
  • a practical embodiment with a ratio of 2:1 will have over 64 seam loops 104 a width of 100 mm and 15.36 mm 2 cross-sectional area F in total (0,36 in height and 0,67 mm in width). This is a 33 % increase in material around the seam pintle with respect to the embodiment of Figure 4.
  • warp yarns 102 and the weft yarns 104 have the same or similarly the same or different S shapes and cross-sectional areas F.
  • the woven fabric 1 according to the invention can be used for papermachine clothing, such as a forming fabric, a press sleeve, an extended nip press belt, a dryer fabric, a base cloth, for a filter belt or for a conveyor belt.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Woven Fabrics (AREA)
  • Paper (AREA)
EP06122252A 2005-11-25 2006-10-13 Gewebestruktur Withdrawn EP1790772A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005056618A DE102005056618A1 (de) 2005-11-25 2005-11-25 Gewebegefüge

Publications (1)

Publication Number Publication Date
EP1790772A1 true EP1790772A1 (de) 2007-05-30

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ID=37726927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06122252A Withdrawn EP1790772A1 (de) 2005-11-25 2006-10-13 Gewebestruktur

Country Status (3)

Country Link
US (1) US20070119513A1 (de)
EP (1) EP1790772A1 (de)
DE (1) DE102005056618A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2163684A3 (de) * 2008-09-10 2010-06-30 Ichikawa Co.,Ltd. Papiermaschinenfilz mit Naht zur Papierherstellung
IT202100007658A1 (it) * 2021-03-29 2022-09-29 Feltri Marone S P A Tessuto di fabbricazione della carta

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005029573A1 (de) * 2005-06-25 2007-01-04 Voith Patent Gmbh Papierherstellungsbespannung
US9404224B2 (en) 2013-11-14 2016-08-02 Georgia-Pacific Consumer Products Lp Soft, absorbent sheets having high absorbency and high caliper, and methods of making soft, absorbent sheets

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095622A (en) * 1975-11-27 1978-06-20 Jwi Ltd. Woven seam in fabric and method of making same
US4438789A (en) * 1981-06-04 1984-03-27 Jwi Ltd. Woven pin seam in fabric and method
WO1991004374A1 (en) * 1989-09-19 1991-04-04 Jwi Ltd. Press section dewatering fabric
WO1991019044A1 (en) * 1990-06-06 1991-12-12 Asten Group, Inc. Papermakers fabric with flat machine direction yarns
WO1999027181A1 (en) * 1997-11-24 1999-06-03 Asten, Inc. Loop/tie-back woven loop seam press base
US6450213B1 (en) * 1999-02-16 2002-09-17 Cofpa - Compagnie Des Feutres Pour Papeteries Et Des Tissus Industriels Symmetrical-weave junction for a strip woven with an asymmetrical weave

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE467696B (sv) * 1990-12-21 1992-08-31 Nordiskafilt Ab Vaev foer en pappersmaskin eller liknande samt saett att tillverka en dylik vaev
GB9521299D0 (en) * 1995-10-18 1995-12-20 Scapa Group Plc Papermakers dryer fabric
US5904187A (en) * 1997-10-22 1999-05-18 Albany International Corp. Seam integrity in multiple layer/multiple seam press fabrics
US6378566B1 (en) * 2001-02-16 2002-04-30 Albany International Corp. Enhancements for seams in on-machine-seamable papermaker's fabrics
US7135093B2 (en) * 2003-03-20 2006-11-14 Weavexx Corporation Pin seamed papermaker's press felt with cross machine direction yarns woven in Dreher weave at seam loops
ATE435329T1 (de) * 2003-04-30 2009-07-15 Voith Patent Gmbh Papiermacherfilz mit verbindungsnaht
US7207355B2 (en) * 2005-05-06 2007-04-24 Astenjohnson, Inc. Multi-axial seamed papermaking fabric and method
DE102005029573A1 (de) * 2005-06-25 2007-01-04 Voith Patent Gmbh Papierherstellungsbespannung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095622A (en) * 1975-11-27 1978-06-20 Jwi Ltd. Woven seam in fabric and method of making same
US4438789A (en) * 1981-06-04 1984-03-27 Jwi Ltd. Woven pin seam in fabric and method
WO1991004374A1 (en) * 1989-09-19 1991-04-04 Jwi Ltd. Press section dewatering fabric
WO1991019044A1 (en) * 1990-06-06 1991-12-12 Asten Group, Inc. Papermakers fabric with flat machine direction yarns
WO1999027181A1 (en) * 1997-11-24 1999-06-03 Asten, Inc. Loop/tie-back woven loop seam press base
US6450213B1 (en) * 1999-02-16 2002-09-17 Cofpa - Compagnie Des Feutres Pour Papeteries Et Des Tissus Industriels Symmetrical-weave junction for a strip woven with an asymmetrical weave

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2163684A3 (de) * 2008-09-10 2010-06-30 Ichikawa Co.,Ltd. Papiermaschinenfilz mit Naht zur Papierherstellung
IT202100007658A1 (it) * 2021-03-29 2022-09-29 Feltri Marone S P A Tessuto di fabbricazione della carta
EP4067569A1 (de) * 2021-03-29 2022-10-05 FELTRI MARONE S.p.A. Papiermachergewebe

Also Published As

Publication number Publication date
US20070119513A1 (en) 2007-05-31
DE102005056618A1 (de) 2007-05-31

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