EP0185108B1 - Bandes de pressage revêtues utilisables dans une presse à pinçage prolongé - Google Patents

Bandes de pressage revêtues utilisables dans une presse à pinçage prolongé Download PDF

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Publication number
EP0185108B1
EP0185108B1 EP84115692A EP84115692A EP0185108B1 EP 0185108 B1 EP0185108 B1 EP 0185108B1 EP 84115692 A EP84115692 A EP 84115692A EP 84115692 A EP84115692 A EP 84115692A EP 0185108 B1 EP0185108 B1 EP 0185108B1
Authority
EP
European Patent Office
Prior art keywords
threads
longitudinal
press belt
coated
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
EP84115692A
Other languages
German (de)
English (en)
Other versions
EP0185108A1 (fr
Inventor
Fritz Vöhringer
Bernhard Dr. Krenkel
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.)
F Oberdorfer & Co KG Industriegewebe-Techni GmbH
Original Assignee
F Oberdorfer & Co KG Industriegewebe-Technik GmbH
F Oberdorfer & Co KG Industriegewebe-Technik 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 F Oberdorfer & Co KG Industriegewebe-Technik GmbH, F Oberdorfer & Co KG Industriegewebe-Technik GmbH filed Critical F Oberdorfer & Co KG Industriegewebe-Technik GmbH
Priority to DE8484115692T priority Critical patent/DE3473778D1/de
Priority to EP84115692A priority patent/EP0185108B1/fr
Priority to AT84115692T priority patent/ATE36877T1/de
Publication of EP0185108A1 publication Critical patent/EP0185108A1/fr
Application granted granted Critical
Publication of EP0185108B1 publication Critical patent/EP0185108B1/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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • 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

  • the invention relates to coated, in particular PUR (polyurethane) coated, press belts, with a carrier fabric, consisting of a set of longitudinal threads and at least one set of transverse threads, for use in wide-nip presses.
  • PUR polyurethane
  • Endless, preferably PUR-coated fabric tapes are used in wide-nip presses in the press section of modern paper machines.
  • the press nip is formed by a concave press shoe and a counter roll, the coated side of the fabric belt sliding on a lubricating film over the press shoe and the fabric side resting on a felt.
  • This arrangement of press shoe, fabric tape, felt and roller creates an extended press zone through which the dryness of the paper web is increased considerably. This enables a corresponding increase in the production speed of the paper machine.
  • the known carrier fabrics (DE-OS-3 231 039, DE-OS-3 235 468, DE-OS-3 224 760, DE-GM-8 319 694) meet the requirements regarding wear resistance, pressure distribution, longitudinal stability and resistance to flexing not fair.
  • EP-A-80 686 it has now been proposed for a double-layer fabric as a covering for paper machines for the production of marking-sensitive papers and for achieving good retention and a long running time, successive warp threads or warp threads separated by at most one intermediate warp thread on the paper side and / or to run the running side in parallel at least in places in pairs, however, by applying this proposal to carrier fabric for coated press belts for use in wide-nip presses, in particular the required high longitudinal stability and resistance of the fabric to flexing is not achieved.
  • the object of the invention is therefore to design the carrier fabric so that the extreme demands placed on such fabrics by the high pressures prevailing in the presses mentioned can be met.
  • cranks so-called double cranks, lying next to one another and guided over the same transverse or weft threads
  • part of the longitudinal threads consists of a material whose longitudinal stability is that of Keviar 0 or steel, while the other part is made of a material whose wear resistance corresponds to that of polyamide.
  • This structure of the carrier fabric ensures that the inward pressure of the double cranks is so large that even when using very thick transverse or weft threads, the longitudinal cranks are at least on one side of the fabric deeper than the transverse cranks, which means that they are not subject to wear .
  • This effect is also achieved with very thin longitudinal threads with a high weave density. This results in a pronounced bending flexibility of the carrier tape in the running direction with good longitudinal stability.
  • high weft thread densities and thus a high number of supporting points or number of weft cranks per unit area are achieved, which lead to an even pressure distribution on the carrier fabric.
  • a value of at least 40 / cm 2 has proven suitable for the number of wearable crankings on the fabric side facing the felt, but much higher values of up to about 160 / cm 2 have also proven particularly useful.
  • 1 to 3 of the carrier fabric for the production of PUR-coated press belts have successive longitudinal or warp threads 11, 12, 13 which form offsets, so-called double offsets, which lie next to one another on one side of the fabric and pass over the same transverse or weft threads 18, 19, 20.
  • these offsets are arranged irregularly in order to avoid the formation of diagonals, which, in interaction with diagonals of the felt, which slides together with the carrier fabric over the press shoe of a wide-nip press, cause a strong lateral run of the PUR-coated tape can cause.
  • the inward pressure caused by the press shoe of the double cranks shown is so great that even when using very thick transverse threads 18, 19, 20, the longitudinal cranks come to lie at least on one side of the fabric deeper than the transverse cranks, so that they Wear are removed.
  • This effect is also achieved with very thin longitudinal threads with a high weave density. This ensures a pronounced bending flexibility of the press belt in the running direction with good longitudinal stability.
  • FIG. 4A and 4B are the press felt (FIG. 4A) and the PUR-coated side facing the press shoe (FIG. 4B) of a press belt according to the invention, which has two layers of transverse threads 21, 22 contains that form opposite levels.
  • the double cranks 14 are a layer of very thick transverse threads which form an upstream wear plane facing the felt of the press. At least some of these cross threads are made of a highly wear-resistant material, for example a polyamide, while the other longitudinal and cross threads can be made of polyester.
  • the diameter of at least some of the longitudinal threads 14 can be at least 25% larger than that of the other longitudinal threads, while the number of wearable crankings on the backing fabric side facing the felt can be more than 160 / cm 2 , but at least 40 / cm 2 . In this way, the diameter and number / cm 2 of the longitudinal threads can be determined so that there is sufficient longitudinal stability.
  • the cross thread layer of the carrier fabric facing the press shoe and carrying the coating forms, together with the likewise thin longitudinal threads, a wide-meshed surface into which the coating material can easily penetrate, while the wear side facing the felt is very densely woven, so that the flow of the coating material during coating is stopped.
  • 5A and 5B show a particularly longitudinally stable and at the same time wear-resistant embodiment of the carrier fabric according to the invention.
  • every second a relatively small diameter and consists of a longitudinally stable and extremely tear-resistant material, such as Kevlar @ or steel.
  • the other longitudinal threads 17 consist of highly wear-resistant material, such as polyamide, as well as the transverse threads 23 facing the felt, and have a diameter similar to this.
  • the longitudinal cranks made of tear-resistant material are pulled deep into the carrier fabric due to the low elongation of such materials and are therefore not exposed to wear. This ensures a longitudinal stability of the coated strip that is independent of wear.
  • the cross threads 24 on the coating side can be multifilaments in order to additionally improve the connection between the fabric and the coating. Furthermore, it has proven useful to choose at least six for the number of longitudinal threads in the repeat.
  • any other suitable coating made of polymer material or rubber can also be used to create a carrier fabric of the type according to the invention.

Landscapes

  • Woven Fabrics (AREA)
  • Paper (AREA)
  • Belt Conveyors (AREA)

Claims (8)

1. Bande de pressage revêtue, particulièrement bande de pressage revêtue de polyuréthane pour mise en oeuvre dans les presses à pinçage prolongé, composé d'un jeu de fils longitudinaux et d'au moins un jeu de fils transversaux, caractérisée par le fait que les fils longitudinaux ou de chaîne qui se suivent (11, 12, 13, 14, 15, 16, 17) et les fils transversaux ou de trame (18, 19, 20) disposés au-dessus d'eux, sur une face au moins du tissu et côte à côte, forment des coudes ou doubles coudes, et qu'une partie des fils longitudinaux est composée d'un matériau dont la stabilité longitudinale correspond à celle du KevlarO ou de l'acier, tandis que l'autre partie est faite d'un matériau dont la résistance à l'usure correspond à celle d'une polyamide.
2. Bande de pressage revêtue, selon la revendication 1, caractérisée par le fait qu'une partie au moins des fils transversaux (18, 19, 20) est composée d'un matériau dont la résistance à l'usure correspond à celle d'une polyamide.
3. Bande de pressage revêtue selon l'une quelconque des revendications 1 ou 2, caractérisée par le fait que le diamètre d'une partie au moins des fils transversaux (18, 19, 20) est d'au moins 25 % supérieur au diamètre des fils longitudinaux.
4. Bande de pressage revêtue selon l'une quelconque des revendications 1 à 3, caractérisée par le fait que le diamètre d'une partie au moins des fils longitudinaux est supérieur de 25 % au moins au diamètre des autres fils longitudinaux.
5. Bande de pressage revêtue, selon l'une quelconque des revendications 1 à 4, caractérisée par le fait que le nombre des coudes d'usure de la face textile tournée vers le feutre qui est conduit sur le cylindre de pressage est de 40 au cm2 au minimum jusqu'à 160 et plus au cm2.
6. Bande de pressage revêtue, selon l'une quelconque des revendications 1 à 5, caractérisée par le fait que le nombre des fils longitudinaux est dans le dessin d'au moins six.
7. Bande de pressage revêtue, selon l'une quelconque des revendications 1 à 6, caractérisée par le fait que les fils transversaux de la face revêtue sont composés d'un matériau multifilaire.
8. Bande de pressage revêtue, selon l'une quelconque des revendications 1 à 7, caractérisée par le fait que le revêtement de la bande de pressage est en caoutchouc.
EP84115692A 1984-12-18 1984-12-18 Bandes de pressage revêtues utilisables dans une presse à pinçage prolongé Expired EP0185108B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8484115692T DE3473778D1 (en) 1984-12-18 1984-12-18 Coated press belts for use in an extended nip press
EP84115692A EP0185108B1 (fr) 1984-12-18 1984-12-18 Bandes de pressage revêtues utilisables dans une presse à pinçage prolongé
AT84115692T ATE36877T1 (de) 1984-12-18 1984-12-18 Beschichtete pressbaender fuer den einsatz in breit-nip-pressen.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84115692A EP0185108B1 (fr) 1984-12-18 1984-12-18 Bandes de pressage revêtues utilisables dans une presse à pinçage prolongé

Publications (2)

Publication Number Publication Date
EP0185108A1 EP0185108A1 (fr) 1986-06-25
EP0185108B1 true EP0185108B1 (fr) 1988-08-31

Family

ID=8192363

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84115692A Expired EP0185108B1 (fr) 1984-12-18 1984-12-18 Bandes de pressage revêtues utilisables dans une presse à pinçage prolongé

Country Status (3)

Country Link
EP (1) EP0185108B1 (fr)
AT (1) ATE36877T1 (fr)
DE (1) DE3473778D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3914533A1 (de) * 1989-05-02 1990-11-08 Heimbach Gmbh Thomas Josef Band fuer papiermaschinen
DE3914534C1 (fr) * 1989-05-02 1990-10-18 Thomas Josef Heimbach Gmbh & Co, 5160 Dueren, De
DE4020589A1 (de) * 1990-06-28 1992-01-09 Oberdorfer Fa F Beschichtetes, flexibles, undurchlaessiges pressband fuer den einsatz in breit-nip-pressen
JP4524233B2 (ja) * 2005-09-22 2010-08-11 イチカワ株式会社 シュープレス用ベルト
US9572806B2 (en) * 2009-12-18 2017-02-21 Mitsubishi Tanabe Pharma Corporation Elution-stabilized preparation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3146385C2 (de) * 1981-11-23 1985-10-31 Hermann Wangner Gmbh & Co Kg, 7410 Reutlingen Doppellagiges Gewebe als Bespannung für Papiermaschinen
US4423755A (en) * 1982-01-22 1984-01-03 Huyck Corporation Papermakers' fabric
DE3224760A1 (de) * 1982-07-02 1984-01-05 Thomas Josef Heimbach GmbH & Co, 5160 Düren Band zum einsatz in nasspressen von papiermaschinen

Also Published As

Publication number Publication date
DE3473778D1 (en) 1988-10-06
ATE36877T1 (de) 1988-09-15
EP0185108A1 (fr) 1986-06-25

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