EP4067569A1 - Papiermachergewebe - Google Patents

Papiermachergewebe Download PDF

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Publication number
EP4067569A1
EP4067569A1 EP22165180.5A EP22165180A EP4067569A1 EP 4067569 A1 EP4067569 A1 EP 4067569A1 EP 22165180 A EP22165180 A EP 22165180A EP 4067569 A1 EP4067569 A1 EP 4067569A1
Authority
EP
European Patent Office
Prior art keywords
yarns
fabric
seaming
pairs
seam
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.)
Pending
Application number
EP22165180.5A
Other languages
English (en)
French (fr)
Inventor
Paolo Franchi
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.)
Feltri Marone SpA
Original Assignee
Feltri Marone SpA
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 Feltri Marone SpA filed Critical Feltri Marone SpA
Publication of EP4067569A1 publication Critical patent/EP4067569A1/de
Pending 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
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/10—Seams thereof

Definitions

  • the present invention relates to a papermaking fabric, that is, a fabric for papermaking machines.
  • the invention relates to a fabric provided with a seam joining two opposite ends of the fabric to form an endless belt.
  • the fabric according to the present invention is particularly suitable for use as a drying fabric in the drying section of the papermaking machine.
  • a papermaking fabric that is, intended for use in one of the various sections of a papermaking machine, consists of warp yarns and weft yarns interwoven according to various patterns and extending respectively in machine direction (MD yarns) and in cross machine direction (CMD yarns), where the terms “machine direction” (abbreviated as “MD”) and “cross machine direction” (abbreviated as “CMD”) indicate a direction aligned with the direction of feed of the fabric in the papermaking machine, and a direction transverse (orthogonal) to the direction of feed, respectively.
  • MD machine direction
  • CMD cross machine direction
  • the fabric is normally made in a flat shape and then closed to form an endless belt, either during production or directly on the papermaking machine, by joining the two opposite ends of the fabric by means of a junction, commonly known as a seam.
  • the ends of the fabric are provided with seaming loops, formed by folded MD yarns, which are then made to interpenetrate so as to form a tubular passage through which one or more joining wires are inserted.
  • the joining area is usually the weakest part of the fabric and the one more subject to wear and deterioration in use, and it also causes a discontinuity in the fabric which can imprint surface defects on the paper being formed and carried by the fabric.
  • US9976254B2 discloses a fabric joined in the form of an endless belt and having in the seam a repetition unit formed by three pairs of MD yarns intertwined with CMD yarns, wherein two of the three pairs of MD yarns form seaming loops at the end edges of the fabric and wherein all the seaming loops have the same length. In this way, two thirds of the MD yarns have ends folded to form the seaming loops.
  • the present invention relates to a papermaking fabric as defined in essential terms in the appended claim 1 and, in its additional features, in the dependent claims.
  • the numeral 1 indicates a papermaking fabric, that is, a fabric intended for use on papermaking machines.
  • the fabric 1 is used as a drying fabric in the drying section of the papermaking machine.
  • the fabric 1 is formed by MD yarns, that is, longitudinal warp yarns extending in machine direction (MD), and CMD yarns, that is, transverse weft yarns orthogonal to the MD yarns and extending in cross machine direction (CMD).
  • MD yarns that is, longitudinal warp yarns extending in machine direction (MD)
  • CMD yarns that is, transverse weft yarns orthogonal to the MD yarns and extending in cross machine direction (CMD).
  • the fabric 1 has a single-layer structure, that is, the MD yarns and the CMD yarns are interwoven with each other to form a single layer of fabric.
  • the MD yarns and the CMD yarns are interwoven with each other according to a repeated weaving pattern both in machine direction and in cross machine direction.
  • the weaving pattern can be of various types.
  • the fabric 1 has a plain weaving pattern. It should be understood that the fabric 1 may have a different weaving pattern.
  • the fabric 1 extends between two longitudinally opposite ends 2 having respective transverse edges 3, only one of which is shown in the attached figure.
  • edges 3 are configured to be joined by a seam 4, which joins the opposite ends 2 of the fabric 1 to form an endless belt.
  • the attached figure only shows some of the MD yarns and CMD yarns, which obviously are repeated to form the whole fabric 1.
  • the fabric is formed by MD yarns 11-18, which are repeated in cross machine direction, and CMD yarns 21-24, which are repeated in machine direction.
  • the fabric 4 may comprise a different number of repeating MD yarns and CMD yarns, depending on the weaving pattern chosen for the fabric 1.
  • the seam 4 has a repeating unit comprising N+1 pairs of MD yarns 11-18, where N is greater than or equal to 3; where N pairs of MD yarns 11-16 form respective seaming loops 25 along the edge 3, whereas a further pair of MD yarns 17-18 does not form seaming loops.
  • the fabric 1 therefore comprises N seaming loops every N+1 pairs of MD yarns, where N is greater than or equal to 3.
  • N is equal to 3.
  • the repeating unit of the seam 4 therefore comprises four pairs of MD yarns 11-18: the three pairs of MD yarns 11,12; 13,14 and 15,16 form respective seaming loops 25; whereas a fourth pair of MD yarns 17,18 does not form seaming loops.
  • the seaming loops 25 project longitudinally from the edge 3 beyond an end CMD yarn arranged along the edge 3 (i.e., beyond the last CMD yarn 24 at the end 2 of the fabric 1).
  • Each seaming loop 25 is defined by a folded yarn portion 26 joining the respective pair of MD yarns.
  • each pair of MD yarns 11-18 and the respective folded yarn portion 26 make up a single yarn, which is woven so as to define the pair of adjacent MD yarns 11-18 and leave the seaming loop 25 projecting beyond the edge 3. It is therefore understood that the term “pairs of MD yarns" is intended to indicate the two parts of a single folded yarn.
  • Each seaming loop 25 is formed by two adjacent MD yarns (that is, consecutive in cross machine direction) laterally abutting against each other. As just highlighted, the two adjacent MD yarns are actually two parts of a single folded yarn.
  • the seaming loops 25 all have the same length in machine direction.
  • the MD yarns 11-16 forming the seaming loops 25 are interwoven with the CMD yarns 21-24 and consecutive, all in the same manner, forming a plain weaving pattern. It should be understood, however, that the MD yarns 11-16 and the CMD yarns 21-24 can be interwoven in other ways, according to different patterns and weaves.
  • the further pair of MD yarns 17,18 which does not form seaming loops, defines a pair of binding MD yarns forming a binding 27.
  • the binding 27 is defined by a folded binding portion 28 which joins the two binding MD yarns 17,18.
  • the binding MD yarns 17,18 are adjacent: the folded binding portion 28 passes around the end CMD yarn 24 arranged along the edge 3 (the last CMD yarn at the end 2 of the fabric 1) and is formed by adjacent binding MD yarns 17,18 laterally abutting against each other.
  • the binding MD yarns 17,18 and the respective folded binding portion 28 also make up a single yarn, which is woven so as to define the pair of binding MD yarns 17-18 and the folded binding portion 28. In this case too, therefore, the two binding yarns 17,18 are actually the two parts of a single folded yarn.
  • each pair of MD yarns 11-16 forming a seaming loop 25 is formed by two adjacent MD yarns laterally abutting against each other.
  • the pair of binding MD yarns 17,18 can be formed by either two adjacent MD yarns 17,18 (which bind the end CMD yarn 24), or two non-adjacent MD yarns (which bind a seaming loop 25).
  • the pair of binding MD yarns 17,18 does not bind any loop 25 formed by the pairs of MD yarns 11-16. It should be understood that the pair of binding MD yarns 17,18 may bind any one of the loops 25.
  • N there will be N pairs of MD yarns forming respective loops 25; these pairs of MD yarns are always arranged in sequence and the pair of binding MD yarns may or may not bind any one of the loops 25.
  • the seaming loops 25 are advantageously located at each end 2 of the fabric 1.
  • the seaming loops 25 located at the respective opposite ends 2 are made to interpenetrate side by side, so as to define a tubular passage through which a wire or other retaining element is inserted and thus form a seam which makes the fabric 1 an endless belt.
  • the fabric 1 has a seaming ratio, defined as the ratio between the number of pairs of MD yarns contributing to the seam (forming seaming loops 25) and the number of pairs of MD yarns not contributing to the seam (since they do not form seaming loops), of 3:1.
  • the seaming ratio is N:1, where N is greater than or equal to 3.
  • the seam is thus ensured by a higher number of MD yarns than in the prior art, for example that described in US9976254B2 , where only two thirds of the MD yarns (66.6%) contribute to the seam.
  • fabrics in accordance with the invention can be made even with N greater than 6, the increase in the strength becomes less significant, whereas it can become more difficult to obtain a flat seam.
  • the fabric in accordance with the present invention allows a particularly efficient and strong seam to be provided.
  • the seam is all the stronger the more numerous the yarns contributing to the seam itself.
  • the seams of fabrics according to the present invention usually have a longer service life, since the normal wear of the MD yarns (which manifests itself with a progressive reduction in the size of the yarns) is compensated by a greater number of yarns contributing to the seam.
  • the joining area is sufficiently homogeneous to avoid or in any case limit the occurrence of defects on the paper being formed.
  • the fabric in accordance with the present invention may have a different weaving pattern or weave, not necessarily a plain weaving pattern.
  • Yarns of various shapes may also be used.
  • the materials with which the yarns are made can be those commonly used in the field.
  • yarns made of polyester, polyamide, polyamide/polyester, polyphenylene sulfide (PPS), or any other synthetic textile material can be used.

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  • Paper (AREA)
EP22165180.5A 2021-03-29 2022-03-29 Papiermachergewebe Pending EP4067569A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102021000007658A IT202100007658A1 (it) 2021-03-29 2021-03-29 Tessuto di fabbricazione della carta

Publications (1)

Publication Number Publication Date
EP4067569A1 true EP4067569A1 (de) 2022-10-05

Family

ID=76269996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22165180.5A Pending EP4067569A1 (de) 2021-03-29 2022-03-29 Papiermachergewebe

Country Status (2)

Country Link
EP (1) EP4067569A1 (de)
IT (1) IT202100007658A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4991630A (en) * 1989-04-10 1991-02-12 Asten Group, Inc. Single layer pin seam fabric having perpendicular seaming loops and method
WO1999027181A1 (en) * 1997-11-24 1999-06-03 Asten, Inc. Loop/tie-back woven loop seam press base
EP1790772A1 (de) * 2005-11-25 2007-05-30 Voith Patent GmbH Gewebestruktur
US9976254B2 (en) 2014-11-25 2018-05-22 Voith Patent Gmbh Papermaking fabric with double loop seam

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4991630A (en) * 1989-04-10 1991-02-12 Asten Group, Inc. Single layer pin seam fabric having perpendicular seaming loops and method
WO1999027181A1 (en) * 1997-11-24 1999-06-03 Asten, Inc. Loop/tie-back woven loop seam press base
EP1790772A1 (de) * 2005-11-25 2007-05-30 Voith Patent GmbH Gewebestruktur
US9976254B2 (en) 2014-11-25 2018-05-22 Voith Patent Gmbh Papermaking fabric with double loop seam

Also Published As

Publication number Publication date
IT202100007658A1 (it) 2022-09-29

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