EP0080686B1 - Tissu à couche double servant de Fourdrinier pour machines à papier - Google Patents

Tissu à couche double servant de Fourdrinier pour machines à papier Download PDF

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Publication number
EP0080686B1
EP0080686B1 EP82110798A EP82110798A EP0080686B1 EP 0080686 B1 EP0080686 B1 EP 0080686B1 EP 82110798 A EP82110798 A EP 82110798A EP 82110798 A EP82110798 A EP 82110798A EP 0080686 B1 EP0080686 B1 EP 0080686B1
Authority
EP
European Patent Office
Prior art keywords
wires
warp
weft
wire
layer
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
EP82110798A
Other languages
German (de)
English (en)
Other versions
EP0080686A1 (fr
Inventor
Georg 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
Priority to AT82110798T priority Critical patent/ATE19105T1/de
Publication of EP0080686A1 publication Critical patent/EP0080686A1/fr
Application granted granted Critical
Publication of EP0080686B1 publication Critical patent/EP0080686B1/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
    • 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

Definitions

  • the invention relates to a double-layer fabric as a covering for paper machines with longitudinal warp wires and with two layers of transverse weft wires.
  • a part of the warp wires is interwoven with the weft wires of both layers, and the paper side is formed by the weft wires of the upper layer and by warp wires.
  • the warp wires have approximately the same diameter as the weft wires of the upper layer.
  • Single-layer bindings were initially used for plastic paper machine clothing.
  • the switch to double-layer bindings has improved longitudinal stability and retention.
  • the fabric marking of the paper web and the high abrasion still cause difficulties, particularly when used in the sheet-forming part of the wet end.
  • the invention solves the problem of creating a double-layer fabric as a covering for paper machines, which is also suitable for the production of marking-sensitive papers and has good retention and a long service life.
  • the warp wires which are guided in pairs on the paper side, have a different course to one another after being transferred into the inside of the sieve, means that in the inside of the sieve the warp wires run at an angle to one another and form an opening in the oblique direction.
  • the water permeability of the fabric is greater than when the warp wires are guided in parallel, also inside the screen.
  • the anti-friction and thus also the running time of the covering is additionally improved in that part of the warp wires is not led down to the running surface and thus remains unaffected by the abrasion even after the lower sieve side has been completely looped through.
  • the warp wires are largely removed from abrasion and the running time is thereby further extended.
  • the double warp wire guide does not lead to any advantages.
  • the distribution of the warp wire cross-section over several wires results in an overall thinner and more flexible fabric, but at the same time the open area decreases due to the widening of the wire cross-section in the transverse direction.
  • the sieves become very sensitive to abrasion, even though the overall cross-section of the chain remains unchanged.
  • the warp wires in the double-layer fabric according to the invention have approximately the same diameter as the weft wires of the upper layer, the cross-section of a warp wire is not divided into two warp wires, but the warp wire thickness remains essentially the same as that of a fabric of otherwise the same construction unchanged and only the warp wire guide is changed so that a double chain results. While in single-layer paper machine screens with double warp guides, the warp wires are considerably thinner than the weft wires and can even have less than half the diameter of the weft wires, in the invention the weft wires and the warp wires of the upper fabric layer have approximately the same diameter, the diameter being, as is generally customary the warp wires can be up to about 10% smaller.
  • An improvement in the fabric marking also results from the fact that the top of the fabric has two types of markings, namely the surface markings which are formed by the warp wires guided in pairs in parallel, and the individual wire markings which result from the offset of individual weft wires. These two types of markings alternate, breaking the legality of the marking arrangement, which is tantamount to reducing the marking.
  • the drawing relates to open woven fabrics so that the warp wires are in the machine direction and the weft wires are transverse to it.
  • the invention is also applicable to endless or round woven screens, in which case the terms “warp wires” and “weft wires” are to be interchanged.
  • warp wires are always understood to mean those in the machine direction and “weft wires” are always the wires running transversely thereto.
  • Fig. 1 shows a double-layer fabric, in which the warp wires 1 run in pairs side by side on the paper side.
  • the desired flat support of the pulp is obtained by running the warp wire pair over at least two weft wires' 2 of the top layer.
  • the warp wires 1 are involved twice per repeat in the formation of the support surfaces: the first time together with the preceding warp wire, the second time with the subsequent warp wire.
  • Adjacent warp wires 1 no longer run parallel to one another in the interior of the sieve, but always at a considerable angle to one another. This causes an opening in the oblique direction and thus a higher permeability inside the tissue.
  • Fig. 4 is a view from above of the lower layer of the Geweöes shows how a better (stronger) cranking of these weft wires is achieved by twisting the warp wires 1 in pairs around the lower weft wires 2.
  • each warp wire 1, together with the preceding warp wire is cranked around a specific weft wire 2, i. H. runs under a weft wire. It then runs two warp wires far inside the screen, i. H. is passed over two weft wires, and is then bent again with the subsequent warp wire under the third weft wire.
  • the warp wires can also run over a distance of more than two weft wires inside the fabric. This pair of cranking the warp wires in the lower layer results in a stronger cranking of the weft wires and thus an improvement in the running time.
  • Fig. 5 explains the influencing factors that determine the offset of the weft wire on the barrel side.
  • the aim is to skew the weft wires 2 so that they lie lower than the warp wires and loop through in front of the warp wires 1.
  • a weft wire is cranked the more, firstly, the longer the free float F is, secondly, the greater the force A with which the outer warp wires A press on the weft wire, and thirdly, the greater that of is the downward force exerted on the internal warp wires B.
  • the length of the free float is determined by the number of shafts of the binding and is thus predetermined, so that with a certain binding the strength of the offset is influenced by the forces exerted by the external and internal warp wires becomes.
  • the outside warp wires A must be strong enough (large diameter) to form the short weft bow. According to the principle illustrated in Fig. 4, this is achieved in that two adjacent warp wires cooperate in the bend.
  • the downward force exerted by the inner warp wires B can be increased by cranking each warp wire per repeat by at least two not immediately successive weft wires on the running side. While in conventional bindings the chain is guided upwards to the upper layer after the looping of a weft wire on the running side in the inside of the sieve, the warp wire is cropped again by a further weft wire before it is bound into the upper layer.
  • Fig. 6 shows in the upper figure this two-time integration of each warp wire per repeat in the lower layer.
  • the lower illustration of FIG. 6 shows the joining of two warp wires to form a weft arch.
  • Another advantage is that there are no parallel warp wires inside the screen, i.e. the warp wires run at an angle to each other inside the sieve. This prevents blockages in the inside of the sieve and increases the drainage capacity of the sieve. This measure has a greater impact the higher the number of shanks of the binding.
  • the warp wires 1a, 1 also run in pairs on the top of the fabric.
  • the course of the one warp wire of a pair is shown in the upper illustration of FIG. 2 and the course of the other warp wire of the same pair in the lower illustration of FIG. 2.
  • the fabric is double-layered and in the finished state consists of 62 longitudinal wires / cm (warp wires for flat weaving, weft wires for continuous weaving) made of polyester monofilament with a wire diameter of 0.17 mm.
  • the ⁇ uer wires lying in pairs one above the other are also monofilaments.
  • the fabric has a total of 2 x 23 cross wires, 23 in the top layer and 23 in the bottom.
  • the outer wires of the top layer are all made of polyester and have a diameter of 0.17 mm.
  • alternating wires made of polyester and polyamide are woven in, both have a diameter of 0.18 mm.
  • the longitudinal wires are therefore only brought together on the paper side, so that there is a fabric with a flat top and a conventionally designed running side.
  • the successive longitudinal wires are merged in pairs once at the top and once at the bottom, but have the remaining length, i. H. outside of these bend points, a different course.

Landscapes

  • Woven Fabrics (AREA)
  • Paper (AREA)
  • Ropes Or Cables (AREA)

Claims (4)

1. Tissu à double couche, servant d'habillage pour machines à papier, avec des fils de chaîne (1) s'étendant longitudinalement et deux couches de fil de trame (2) s'étendant transversalement, au moins une partie des fils de chaîne (1) étant en entrelacement avec des fils de trame (2) des deux couches, le côté papier étant constitué des fils de trame (2) de la couche supérieure et des fils de chaîne (1), et les fils de chaîne (1) présentant approximativement le même diamètre que les fils de trame (2) de la couche supérieure, caractérisé en ce que des fils de chaîne (1) successifs passent par paires parallèles, sur le côté papier, par dessus au moins deux fils de trame (2), et, après être passés à l'intérieur de la toile, suivent deux tracés différents l'un de l'autre.
2. Tissu selon la revendication 1, caractérisé en ce que, dans chaque paire de fils de chaîne, seul un fil de chaine (1) s'engage dans la couche inférieure.
3. Tissu selon la revendication 1 ou 2, caractérisé en ce que chaque fil de chaîne (1) passe, sur le côté papier, au moins deux fois par rapport au-dessus de deux fils de trame (2), la première fois en même temps que le fil de chaîne précédent (1), la deuxième fois en même temps que le fil de chaîne suivant (1 ).
4. Tissu selon l'une des revendications 1 à 3, caractérisé en ce que, pour chaque rapport, chaque fil de chaîne (1) se trouvant dans la couche inférieure passe en-dessous de deux fils de trame (2) non successifs, et ce une fois avec le fil de chaîne précédent, et l'autre fois avec le fil de chaîne suivant.
EP82110798A 1981-11-23 1982-11-23 Tissu à couche double servant de Fourdrinier pour machines à papier Expired EP0080686B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82110798T ATE19105T1 (de) 1981-11-23 1982-11-23 Doppellagiges gewebe als bespannung fuer papiermaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3146385A DE3146385C2 (de) 1981-11-23 1981-11-23 Doppellagiges Gewebe als Bespannung für Papiermaschinen
DE3146385 1981-11-23

Publications (2)

Publication Number Publication Date
EP0080686A1 EP0080686A1 (fr) 1983-06-08
EP0080686B1 true EP0080686B1 (fr) 1986-04-09

Family

ID=6147006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82110798A Expired EP0080686B1 (fr) 1981-11-23 1982-11-23 Tissu à couche double servant de Fourdrinier pour machines à papier

Country Status (4)

Country Link
US (1) US4564052A (fr)
EP (1) EP0080686B1 (fr)
AT (1) ATE19105T1 (fr)
DE (2) DE3146385C2 (fr)

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FR2346489A1 (fr) * 1976-04-02 1977-10-28 Martel Catala Et Cie Sa Ets Perfectionnements aux toiles pour machines a papier et a leurs procedes de fabrication
US4086941A (en) * 1976-10-26 1978-05-02 Huyck Corporation Biplanar papermaker's belt
US4314589A (en) * 1978-10-23 1982-02-09 Jwi Ltd. Duplex forming fabric
DE2907488C2 (de) * 1979-02-26 1982-07-01 Dürener Metalltuch Schoeller, Hoesch & Co, 5160 Düren Papiermaschinenlangsieb
US4356844A (en) * 1980-02-11 1982-11-02 Huyck Corporation Papermaker's forming fabric
US4359069A (en) * 1980-08-28 1982-11-16 Albany International Corp. Low density multilayer papermaking fabric
DE3036409C2 (de) * 1980-09-26 1983-01-20 Hermann Wangner Gmbh & Co Kg, 7410 Reutlingen Doppellagiges Sieb für den Siebteil einer Papiermaschine

Also Published As

Publication number Publication date
EP0080686A1 (fr) 1983-06-08
DE3146385C2 (de) 1985-10-31
DE3270485D1 (en) 1986-05-15
US4564052A (en) 1986-01-14
DE3146385A1 (de) 1983-06-01
ATE19105T1 (de) 1986-04-15

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