EP0114656B1 - Tissu composite comme habillage pour le dispositif de formation de feuille d'une machine à papier - Google Patents

Tissu composite comme habillage pour le dispositif de formation de feuille d'une machine à papier Download PDF

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Publication number
EP0114656B1
EP0114656B1 EP84100491A EP84100491A EP0114656B1 EP 0114656 B1 EP0114656 B1 EP 0114656B1 EP 84100491 A EP84100491 A EP 84100491A EP 84100491 A EP84100491 A EP 84100491A EP 0114656 B1 EP0114656 B1 EP 0114656B1
Authority
EP
European Patent Office
Prior art keywords
weft
binding
binder
layer
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
Application number
EP84100491A
Other languages
German (de)
English (en)
Other versions
EP0114656A1 (fr
Inventor
Georg Dipl.-Ing. Borel
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.)
Herman Wangner GmbH and Co KG
Original Assignee
Herman Wangner GmbH and Co KG
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 Herman Wangner GmbH and Co KG filed Critical Herman Wangner GmbH and Co KG
Publication of EP0114656A1 publication Critical patent/EP0114656A1/fr
Application granted granted Critical
Publication of EP0114656B1 publication Critical patent/EP0114656B1/fr
Expired 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
    • D21F1/0036—Multi-layer screen-cloths
    • D21F1/0045—Triple layer fabrics
    • 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
    • Y10S162/903—Paper forming member, e.g. fourdrinier, sheet forming member
    • 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]
    • Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
    • Y10T442/3195—Three-dimensional weave [e.g., x-y-z planes, multi-planar warps and/or wefts, etc.]

Definitions

  • the invention relates to a composite fabric as covering for the sheet-forming part of a paper machine with at least two fabric layers bound together by binding threads.
  • Fabrics for the sheet-forming part of a paper machine should on the one hand have the smoothest possible surface (paper side) so that no markings occur in the paper.
  • the underside (running side) should be designed in such a way that the sheet forming screen has a longest possible running time. By using cheaper and more abrasive fillers and increasing the working speed, the running side is exposed to high abrasion.
  • each surface can be given any surface structure that is independent of the other side.
  • Such a fabric as a sheet forming screen is known from DE-A-24 55 184 and 24 55 185. These are round-woven sieves with a binding chain. This means that in the finished sieve, both layers are connected to each other by transverse binding wires.
  • the binding of both layers of fabric with a binding chain has the disadvantage that the chain is already under tension during weaving (weaving tension) and therefore influences the structure of the paper side.
  • a two-layer fabric with a binding chain is woven open and made endless by means of a woven seam, the binding chain runs lengthways in the finished sieve. Since the fabric is lengthened in the heating zone during heat setting, the warp wires are again under a high working tension. Since the weft wires in the lower layer are much thicker and stiffer, the tension of the binding chain affects almost exclusively the finer upper layer. The binding chain pulls the fine weft wires of the upper layer deep down at the binding points, which causes defects in the uniformity of the surface.
  • a certain remedy in this regard is the joining of the two layers with a binding weft, as is known from DE-A-29 17 694.
  • both types of fabric are identical in the finished state - in both the two layers are connected to each other by the additional cross wire - the production is somewhat easier, since e.g. B. in an openly woven and sewn sieve, the connection of the two layers takes place both during weaving and during fixing by a cross wire (weft wire).
  • a uniform surface structure of the upper layer is not achieved either.
  • the additional binding weft pulls the upper chain downwards and causes unwanted indentations in the tissue at the tying points.
  • the tensile stress in the binding weft wire already arises during weaving, when the binding wire, which the shooter initially laid out stretched, is bent when changing the position of the harness.
  • the originally straight binding weft is now cranked and runs in a zigzag pattern alternating between the two relatively far apart upper and lower layers of the composite fabric. Due to this enlargement of its path, the binding wire is stretched during weaving. Since the lower layer consists of relatively thick, unyielding warp and weft wires, the entire tension of the binding weft wire is also transferred to the binding point of the upper layer. Only the finer upper layer can yield in its structure. This means that the structure of the top layer changes at every setting point during weaving.
  • a felt for the press section and the dryer section of a paper machine which consists of two fabric layers which are connected by binding threads which run partly in the warp direction and partly in the weft direction. Each binding thread is bound in both fabric layers, which results in a very firm connection of the fabric layers.
  • the invention has for its object to provide a composite fabric as a covering for the sheet-forming part of a paper machine, which consists of at least two layers of fabric bound together by binding threads and in which the uniformity of the surface structure of the paper side is improved.
  • binding threads form an elastic intermediate layer and each individual binding thread is bound in at most one of the at least two fabric layers.
  • binding threads of the intermediate fabric run partly in the warp direction and partly in the weft direction and are therefore referred to as «binding chain or « binding weft Formula
  • the binding chain is interwoven with the one fabric layer, for example the upper fabric layer, at certain intervals, and the binding weft is interwoven with the other fabric layer, here the lower fabric layer.
  • only the binding chain or only the binding weft is partly bound into the upper and partly into the lower fabric layer, while the other binding threads, i.e. H. the binding weft or the binding chain only act as warp or weft threads of the intermediate fabric, and are not integrated into one of the two fabric layers.
  • the basic idea in each case is that one and the same binding thread is not bound in both fabric layers, as a result of which the intermediate layer formed by the binding threads connects the fabric layers elastically to one another.
  • the individual layers of the composite fabric consist in the usual way of plastic monofilament, in particular of polyester wire.
  • the binding threads are also monofilament or multifilament plastic threads.
  • the binding threads bound into the upper layer are even thinner than the structural warp and weft wires of the upper layer.
  • the structure of the binding threads can that of the running side, i.e. H. absorb stresses from the lower layer and keep them largely away from the upper layer.
  • the uniformity of the surface structure of the paper side is therefore not affected by tensions emanating from the lower layer during weaving or fixing.
  • the intermediate fabric formed from the binding threads thus not only serves to connect the upper fabric layer and the lower fabric layer, but at the same time absorbs the stresses that occur during the production of the composite fabric.
  • Fig. 1 shows a section in the warp direction through a composite fabric, which consists of an upper layer 1 and a lower layer 2.
  • the top layer has a plain weave and is made of relatively fine plastic monofilaments.
  • the lower layer 2 consists of much coarser plastic monofilaments and has a four-shaft binding.
  • the number of weft wires and warp wires per unit length is only half as high as in the top layer 1.
  • Figure 2 shows the same fabric in a section parallel to the weft direction.
  • the upper layer 1 and the lower layer 2 are connected by binding wires, namely by a binding chain 4 and a binding weft 5.
  • the binding chain 4 is tied with every eighth weft wire of the lower layer 2, ie runs under this weft wire.
  • the binding weft 5 is guided from below over every eighth warp wire of the upper layer 1.
  • Binding chain 4 and binding weft 5 are not interwoven and form an intermediate layer 3, which is located in the space between the upper layer 1 and the lower layer 2. Because the binding chain 4 runs between the binding locations with the lower layer 2 above the binding weft 5, however, cohesion results similar to that in a fabric.
  • the intermediate layer 3 is very wide-meshed and therefore has only a very loose cohesion.
  • the binding chain 4 is only integrated into the lower layer 2 after every second binding weft 5.
  • FIG. 3 shows a section similar to that of FIG. 2, but the binding weft 5 is more firmly integrated in the upper layer 1.
  • the binding weft 5 is bound in each case over a distance of three warp threads of the upper layer 1 by being guided over one warp thread, under the next warp thread and again over the next warp thread.
  • a force exerted by the binding weft 5 on the upper layer 1 is thus distributed over a larger area and less disturbs the uniformity of the surface structure of the upper layer 1.
  • FIGS. 4 to 6 show an embodiment in which the binding chain 4 is connected to the upper layer 1 and the binding weft 5 to the lower layer 2.
  • the density of the intermediate layer 3 is twice as high as in the above exemplary embodiment in FIG. 3.
  • the binding chain 4 and the binding weft 5 form a weave, since the binding chain 4 runs alternately above and below a binding weft 5 and, accordingly, the binding weft 5 runs alternately above and below a binding chain 4, the binding chain 4 starting at the places where it runs over a binding weft 5 is bound into the upper layer 1 and, accordingly, the binding weft 5 is bound into the lower layer 2 at the points where it runs under a binding chain 4.
  • FIGS. 4 and 5 show the course of two successive binding chains 4, while FIG. 6 shows the course of a binding weft 5.
  • FIGS. 7 to 10 only every second binding weft 5 is bound into the upper layer 1, while the binding weft 5 in between is not bound into either of the two layers 1, 2 and is only involved in the formation of the intermediate layer 3, s.
  • Figures 7, 8 and 9 show a section parallel to the weft direction, while Figure 10 shows a section parallel to the warp direction and accordingly the course of the binding chain 4. Because only every second binding weft 5 is actually also incorporated into the upper layer 1, a very loose, elastic connection of the two layers 1, 2 is obtained.
  • FIG. 11 and 12 show an embodiment in which the binding weft 5 alternates into the upper layer 1 (FIG. 11) and in the lower layer 2 (FIG. 12), while the binding chain 4 is not integrated in either of the two layers 1, 2 and is only involved in the formation of the intermediate layer 3.
  • This type of connection of the layers does not transmit tensions and distortions in the warp direction from the lower layer 2 to the upper layer 1.
  • Figures 11 and 12 each show a section parallel to the weft wires.
  • the upper fabric layer 1 of a composite fabric consisting of two fabric layers is openly woven with 32 longitudinal threads (warp) per centimeter and 36 transverse threads (weft) per centimeter in plain weave.
  • the longitudinal threads 6 have a diameter of 0.17 mm and consist of a polyester monofilament of medium to low longitudinal stability and medium modulus of elasticity (Trevira 930).
  • the transverse threads 7 also have a diameter of 0.17 mm and consist of a polyester monofilament with a very low modulus of elasticity and low thermal shrinkage (Trevira 900).
  • the lower fabric layer 2 is a four-strand, four-twill weave with weave no.0401 with long floats of the cross threads on the running side and short floats on the top.
  • the lower fabric layer 2 is open-woven with 16 longitudinal threads per centimeter and 18 transverse threads per centimeter at the same time as the top layer 1.
  • the longitudinal threads 8 have a diameter of 0.32 mm and consist of polyester monofilament with a high modulus of elasticity.
  • the transverse threads 9 of the lower fabric layer 2 are made of a particularly abrasion-resistant material and consist alternately of polyester monofilament and polyamide monofilament with a diameter of 0.35 mm.
  • the active, outer fabric layers 1 and 2 are connected by an elastic, tension-compensating intermediate layer 3.
  • Binding weft wires 5 which bind into the upper fabric layer 1 can be monofilament or multifilament plastic threads made of polyester or polyamide.
  • a polyester monofilament with a diameter of 0.15 mm with a low modulus of elasticity was used.
  • Binding weft wires 5, which only bind in the intermediate layer 3 (FIG. 8), are expediently monofilaments with a medium to high modulus of elasticity, and also have a diameter of 0.15 mm.
  • Monofilament or multifilament polyester or polyamide threads can be used as binding warp wires 4 of the intermediate layer 3.
  • monofilament polyester threads with a diameter of 0.18 mm were used.
  • the binding warp wires 4 bind only in the lower fabric . topping 2.

Landscapes

  • Woven Fabrics (AREA)
  • Paper (AREA)

Claims (6)

1. Tissu composite, comme habillage pour la partie formation de la feuille d'une machine à papier, constitué d'au moins deux couches de tissu (1, 2), liées l'une à l'autre par des fils de liage (4, 5), caractérisé en ce que les fils de liage (4, 5) courent pour partie dans le sens de la chaîne et pour partie dans le sens de la trame et forment une couche intermédiaire élastique (3), et que chaque fil de liage individuel (4, 5) est inséré au plus dans l'une des au moins deux couches de tissu (1, 2).
2. Tissu composite selon la revendication 1, caractérisé en ce que les fils de liage (chaîne de liage 4) courant dans le sens de la chaîne sont insérés dans une couche de tissu (1 ou 2) et que les fils de liage (trame de liage 5) courant dans le sens de la trame sont insérés dans l'autre couche de tissu (respectivement 2 ou 1).
3. Tissu composite selon la revendication 1 ou 2, caractérisé en ce que les fils de liage (4 ou 5) insérés dans la couche supérieure (1) passent sous tous les fils de liage (respectivement 5 et 4) insérés dans la couche inférieure (2).
4. Tissu composite selon la revendication 1 ou 2, caractérisé en ce que la chaîne de liage (4) et la trame de liage (5) sont entrelacées l'une avec l'autre.
5. Tissu composite selon la revendication 4, caractérisé en ce qu'un certain nombre des fils de liage de la chaîne de liage (4) ou de la trame de liage (5) sont insérés dans la couche supérieure, les autres fils de liage, soit de la chaîne de liage (4), soit de la trame de liage (5), étant insérés dans la couche inférieure (2), tandis que la trame de liage (5) non insérée ou la chaîne de liage (4) non insérée ne participe qu'à la formation de la couche intermédiaire (3).
6. Tissu composite selon l'une des revendications 1 à 5, caractérisé en ce que les fils de liage (4, 5) sont insérés dans l'une des deux couches de tissu (1, 2) de telle sorte qu'ils soient entrelacés avec plusieurs fils de chaîne ou de trame de ces couches de tissu (respectivement 1 et 2).
EP84100491A 1983-01-20 1984-01-18 Tissu composite comme habillage pour le dispositif de formation de feuille d'une machine à papier Expired EP0114656B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3301810A DE3301810C2 (de) 1983-01-20 1983-01-20 Verbund-Gewebe als Bespannung für den Blattbildungsteil einer Papiermaschine
DE3301810 1983-01-20

Publications (2)

Publication Number Publication Date
EP0114656A1 EP0114656A1 (fr) 1984-08-01
EP0114656B1 true EP0114656B1 (fr) 1987-03-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100491A Expired EP0114656B1 (fr) 1983-01-20 1984-01-18 Tissu composite comme habillage pour le dispositif de formation de feuille d'une machine à papier

Country Status (3)

Country Link
US (1) US4515853A (fr)
EP (1) EP0114656B1 (fr)
DE (2) DE3301810C2 (fr)

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Also Published As

Publication number Publication date
DE3301810C2 (de) 1986-01-09
DE3462527D1 (en) 1987-04-09
DE3301810A1 (de) 1984-08-02
US4515853A (en) 1985-05-07
EP0114656A1 (fr) 1984-08-01

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