EP1507041B1 - Jonction d'une toile de papeterie - Google Patents

Jonction d'une toile de papeterie Download PDF

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Publication number
EP1507041B1
EP1507041B1 EP04103930A EP04103930A EP1507041B1 EP 1507041 B1 EP1507041 B1 EP 1507041B1 EP 04103930 A EP04103930 A EP 04103930A EP 04103930 A EP04103930 A EP 04103930A EP 1507041 B1 EP1507041 B1 EP 1507041B1
Authority
EP
European Patent Office
Prior art keywords
warp
yarns
yarn
paper
fabric
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.)
Expired - Lifetime
Application number
EP04103930A
Other languages
German (de)
English (en)
Other versions
EP1507041A1 (fr
Inventor
David Holden
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
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Voith Patent GmbH
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1507041A1 publication Critical patent/EP1507041A1/fr
Application granted granted Critical
Publication of EP1507041B1 publication Critical patent/EP1507041B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths

Definitions

  • This invention relates to dryer fabrics for use in the dryer section of a papermaking machine and in particular to an improvement in the seam area.
  • Paper is conventionally manufactures by conveying a paper furnish, usually consisting of an initial slurry of cellulosic fibres, on a forming fabric or between two forming fabrics in a forming section, the nascent sheet then being passen through a pressing section and ultimately through a drying section of a papermaking machine.
  • the paper web is transferred from the press fabric to a Yankee dryer cylinder and then crèped.
  • Papermachine clothing is essentially employed to carry the paper web through these various stages of the papermaking machine.
  • the fibrous fumigh is wet-laid onto a moving forming wire and water is encouraged to drain from it by means of section boxes and foils.
  • the paper web is then transferred to a press fabric that conveys it through the pressing section, where it usually passes through a series of pressure nips formed by rotating cylindrical press rolls. Water is squeezed from the paper web and into the press fabric as the web and fabric pass through the nip together.
  • Press fabrics generally comprise a batt of fibres needled to a base fabric.
  • the paper web is transferred either to a Yankee dryer, in the case of tissue paper manufacture, or to a set of dryer cylinders upon which, aided by the clamping action of the dryer fabric, the majority of the remaining water is evaporated.
  • Dryer fabrics are woven flat, where the yarns of the warp in the loom lie in the machine direction of the fabric on the papermachine.
  • Dryer fabrics have a range of permeabilities depending upon the particular application. Fabrics with relatively high permeability may have a permeability of around 250 cfm, typically consisting of a single layer of weft yarns with warp yarns woven symmetrically about the medium plane of the fabric. In the case of such a fabric there is no problem with seaming.
  • Lower permeability fabrics may consist of two (or more) layers of weft yarns with the yarns of the upper (paper side) layer often being of smaller diameter than those in the lower layer.
  • the usual weave pattern of the warp yarns is "face Biased", that is, the upper paper supporting side of the fabric consists of floats over two or more weft yarns, whilst the lower machine side consists of knuckles where warp yarns are woven around only one weft yarn.
  • fabrics are commonly woven with flattened monofilament warp yarns extending in the machine direction, with width to depth ratios in the order of 2 : 1 to 3 : 1.
  • the fabric is first of all woven flat to its full length. A number of weft threads, say over about 30mm of the fabric length, are removed from each end of the fabric, leaving a fringe of warp (machine direction) yarns exposed. Alternate warp yarns are bent back to form a series of aligned loops and the remainder form binders. All ends are then rewoven back into the fabric. In order to avoid double warp paths in the seam zone, half of the warp yarns coming from the body of the fabric are cut short before reaching this seam zone, so leaving empty warp paths for the weaving back of the loop and binder yarn ends into the fabric. The returning warp yarns meet the incoming, conventionally staggered, short warps, so forming overall a continuous warp path. The seam is completed by intermeshing the loops formed at the opposite ends of the fabric and inserting a pintle yarn.
  • An object of the invention is to provide a solution to the disadvantages caused by having to rotate the yarn in the seam and in particular the dimensional and marking problems arising from the presence of the twist.
  • the necessity for imparting a twist to warp yarns in the seaming loop is eliminated by providing face and back warp paths which are symmetrically opposite.
  • “Symmetrically opposite” means that the weave paths are reversed with respect to a central plane of the fabric, so that the paperside floats are the same as the machine side floats, although they are staggered because of the offset weft yarn. arrangement.
  • the symmetrically opposite yarn paths extend throughout the full length of the fabric and not only the end regions.
  • the warp yarn paths are provided in pairs, with one path exhibiting a face bias to the paper side, with two, three or more yarn floats on the paper side of the fabric and knuckles on the machine side of the fabric.
  • the next adjacent warp yarn path exhibits a face bias to the machine side, with identical length floats on the machine side as the first described path has on the paper side, and with the floats and knuckles on the two yarn paths coinciding positionally as closely as possible with reference to any stagger between upper and lower weft yarns.
  • a percentage of the yarns in the second path will often be cut short (on the non-paper side) before reaching the seam zone, to allow the yarn in the adjacent first path to be formed into a seaming loop or a binder yarn, and the free end woven back in the empty second path for a sufficient distance to form a complete warp path, as well as to anchor the yarn against the high longitudinal tension arising in the seam.
  • the weave is completed in known manner by displacing adjacent yarn path pairs by one or more weft yarns to produce a complete weave in the usual way.
  • a first papermachine fabric according to the invention comprises two layers of weft yarns 10, 11 extending in the cross-machine direction, and staggered with respect to each other.
  • Second warp yarn 12 terminates short of the seam area of the fabric on the machine side of the fabric at 16 and a woven back end portion 13a of the first warp yarn 13, continues the yarn path of yarn 12.
  • the weave is an 8 end repeat, yarns 12 and 13a between them weaving in an over five, under three pattern in each repeat group, forming the paperside floats.
  • the first yarn 13, before it is woven back as 13a, is extended from the edge of the fabric to form a seaming loop 14 (shown with a pintle yarn 15 in place).
  • seaming loop 14 is formed by a former float in the warp path of said first yarn 13, therefore having original no twist incorporated before the formation of said loop 14.
  • the woven back end portion 13a of the first warp yarn 13 is an extension of the seaming loop and is woven back into the fabric sufficiently to anchor the yarn against machine direction tensile forces acting on the seam, and terminates at 16 adjacent to the cut off end of yarn 13. In reality, this weaving back would occur over a much greater distance than is shown in figure 1 .
  • first yarn 13 produces short floats on the machine side and knuckles on the paper side, weaving in a 3 + 5 pattern over an 8 end repeat, and the knuckles and floats of the yarns 12, 13a are symmetrically opposite and staggered by one weft yarn thereto.
  • This symmetrically opposite weave pattern means that there is no need for a twist to be put into first yarn 13, forming either the seam loop 14 or binder (not shown), due to the fact that the upper yarn path into which first yarn 13 is going to be woven, is simply an inversion of it's previous path and so the crimp fits.
  • Figs. 2 and 3 show the surface appearance of the fabric, respectively from the paper side and from the machine side.
  • the weft yarns in the upper paperside layer are given odd numbers 1 - 19, and in the lower machine side layer are given even numbers 2 - 18. Exposed weft yarns are given longitudinal shading, whilst lower layer yarns are unshaded.
  • Warp yarns are numbered in symmetrical pairs 1, 1a to 5, 5a disposed with their respective knuckles and floats on opposite sides of the fabric to those of the other yarn of the pair. Exposed parts of the respective warp yarns are shaded by cross-hatching, whilst other parts of the yarns are hidden. It will be seen that the paperside and machine side patterns are effectively identical.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Claims (9)

  1. Habillage de machine à papier tissé à plat comprenant un côté papier et un côté machine, l'habillage comprenant des fils de trame (10, 11) qui sont entrelacés avec des premiers (13) et des deuxièmes (12) fils de chaîne, dans lequel, pour réaliser la jonction, plusieurs des premiers fils de chaîne (13) sont tissés en arrière de manière à former des boucles (14), dans lequel au moins dans la zone de jonction le chemin de chaîne des premiers fils de chaîne (13) est opposé de façon symétrique au chemin de chaîne des deuxièmes fils de chaîne (12), de telle sorte que la partie tissée en arrière desdits premiers fils (13) puisse suivre le chemin de chaîne desdits deuxièmes fils (12) sans être tordus davantage, dans lequel les chemins de fil opposés de façon symétrique des premiers (13) et des deuxièmes (12) fils de chaîne sont adjacents et s'étendent sur la totalité de la longueur de la toile, caractérisé en ce que le chemin de chaîne du premier fil de chaîne (13) présente un biais frontal sur le côté papier avec deux ou plus de deux flottés de fil sur le côté papier et des rotules sur le côté machine, et le chemin de chaîne du deuxième fil de chaîne (12) présente un biais frontal sur le côté machine avec des flottés de fil sur le côté machine qui sont identiques à ceux que le premier fil de chaîne présente sur le côté papier.
  2. Habillage de machine à papier selon la revendication 1, caractérisé en ce que les premiers (13) et deuxièmes (12) fils de chaîne sont agencés par paires de premier (13) et deuxième (12) fils de chaîne.
  3. Habillage de machine à papier selon l'une quelconque des revendications 1 à 2, caractérisé en ce que les fils de trame sont agencés en une couche de fils de trame.
  4. Habillage de machine à papier selon l'une quelconque des revendications 1 à 2, caractérisé en ce que les fils de trame (10, 11) sont agencés en deux ou plus de deux couches.
  5. Habillage de machine à papier selon la revendication 4, caractérisé en ce qu'au moins deux couches sont disposées en quinconce l'une par rapport à l'autre.
  6. Habillage de machine à papier selon l'une quelconque des revendications précédentes, caractérisé en ce que les deuxièmes fils de chaîne (12) sont coupés courts avant d'atteindre la zone de jonction de manière à laisser des chemins de chaîne vides pour les premiers fils de chaîne tissés en arrière (13).
  7. Habillage de machine à papier selon la revendication 6, caractérisé en ce que lesdits deuxièmes (12) fils de chaîne courts coupés (16) se terminent sur le côté machine de ladite toile.
  8. Habillage de machine à papier selon l'une quelconque des revendications précédentes, caractérisé en ce que les boucles (14) sont formées par des flottés précédents dans les chemins de chaîne desdits premiers fils.
  9. Habillage de machine à papier selon l'une quelconque des revendications précédentes, caractérisé en ce que l'habillage de machine à papier est une toile sécheuse.
EP04103930A 2003-08-14 2004-08-16 Jonction d'une toile de papeterie Expired - Lifetime EP1507041B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0319060 2003-08-14
GBGB0319060.0A GB0319060D0 (en) 2003-08-14 2003-08-14 Papermachine fabric seaming

Publications (2)

Publication Number Publication Date
EP1507041A1 EP1507041A1 (fr) 2005-02-16
EP1507041B1 true EP1507041B1 (fr) 2011-10-12

Family

ID=28052472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04103930A Expired - Lifetime EP1507041B1 (fr) 2003-08-14 2004-08-16 Jonction d'une toile de papeterie

Country Status (3)

Country Link
EP (1) EP1507041B1 (fr)
AT (1) ATE528440T1 (fr)
GB (1) GB0319060D0 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015103812U1 (de) 2015-07-20 2015-08-12 Heimbach Gmbh & Co. Kg Trockensieb, damit ausgestattete Trockenpartie einer Papiermaschine sowie Verwendung des Trockensiebes in dieser Trockenpartie
DE202017100990U1 (de) 2017-02-22 2017-04-11 Heimbach Gmbh & Co. Kg Trockensieb, mit einem solchen ausgestattete Trockenpartie einer Papiermaschine sowie Verwendung des Trockensiebs in dieser Trockenpartie
DE202018103522U1 (de) 2018-06-21 2018-09-14 Heimbach Gmbh & Co. Kg Bespannung für Papiermaschinen oder Zellstoffentwässerungsmaschinen sowie Verwendung einer solchen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU527809B2 (en) * 1978-11-30 1983-03-24 Albany International Corp. Forming fabric seam and method of producing
US4438789A (en) 1981-06-04 1984-03-27 Jwi Ltd. Woven pin seam in fabric and method
BR9404656A (pt) 1993-03-19 1999-06-15 Jwi Ltd Costura por agulha com alta densidade de laçada

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015103812U1 (de) 2015-07-20 2015-08-12 Heimbach Gmbh & Co. Kg Trockensieb, damit ausgestattete Trockenpartie einer Papiermaschine sowie Verwendung des Trockensiebes in dieser Trockenpartie
EP3121330A1 (fr) 2015-07-20 2017-01-25 Heimbach GmbH & Co. KG Crible sec, partie seche d'une machine a papier comprenant celui-ci et utilisation du crible sec dans ladite partie seche
DE202017100990U1 (de) 2017-02-22 2017-04-11 Heimbach Gmbh & Co. Kg Trockensieb, mit einem solchen ausgestattete Trockenpartie einer Papiermaschine sowie Verwendung des Trockensiebs in dieser Trockenpartie
DE202018103522U1 (de) 2018-06-21 2018-09-14 Heimbach Gmbh & Co. Kg Bespannung für Papiermaschinen oder Zellstoffentwässerungsmaschinen sowie Verwendung einer solchen
US11230808B2 (en) 2018-06-21 2022-01-25 Heimbach Gmbh Clothing for paper machines or pulp dewatering machines and the use of such a clothing

Also Published As

Publication number Publication date
ATE528440T1 (de) 2011-10-15
EP1507041A1 (fr) 2005-02-16
GB0319060D0 (en) 2003-09-17

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