EP0609664B1 - Dryer cloth and process for making the same - Google Patents

Dryer cloth and process for making the same Download PDF

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Publication number
EP0609664B1
EP0609664B1 EP19940100333 EP94100333A EP0609664B1 EP 0609664 B1 EP0609664 B1 EP 0609664B1 EP 19940100333 EP19940100333 EP 19940100333 EP 94100333 A EP94100333 A EP 94100333A EP 0609664 B1 EP0609664 B1 EP 0609664B1
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EP
European Patent Office
Prior art keywords
filaments
group
longitudinal
dryer fabric
fabric according
Prior art date
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Expired - Lifetime
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EP19940100333
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German (de)
French (fr)
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EP0609664A1 (en
Inventor
Sylvester Eschmann
Martin Hüser
Walter Halterbeck
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Heimbach GmbH and Co KG
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Thomas Josef Heimbach and Co GmbH
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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
    • 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
    • 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]
    • Y10T442/3065—Including strand which is of specific structural definition
    • Y10T442/3089—Cross-sectional configuration of strand material is specified
    • Y10T442/3106—Hollow strand material
    • 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
    • Y10T442/322—Warp differs from weft

Definitions

  • the invention relates to a dryer fabric in itself Machine direction extending longitudinal threads and across extending transverse threads made of plastic material, one first group of longitudinal threads on the paper side over several Cross threads floated and a second group of longitudinal threads that is different from the first group of Includes longitudinal threads.
  • Dryer fabrics are made of plastic threads longitudinal threads extending in the machine direction and extending transversely cross threads extending thereto. You will be in the dry area used in a paper machine and guide the paper web there over the hot drying cylinders. It is essential that the dryer fabrics ensure good heat transfer and one Condensation is prevented. It is therefore endeavored Form dryer fabrics as thin as possible and large ones To provide contact areas.
  • the known dryer fabric has a good contact surface Because of the use of very wide flat monofilaments in particular for the longitudinal threads of the first group. These threads affect however the flexibility of the dryer fabric. Furthermore are the very wide flat monofilaments Special threads that are not easy to process and are expensive.
  • the invention has for its object a dryer type mentioned in such a way that despite large contact area achieved good flexibility on the paper side becomes.
  • This object is achieved in that in each case at least two adjacent longitudinal threads of the first group of subgroups of those that run at least on the paper side Form longitudinal threads and the longitudinal threads of a subgroup Lying side by side, and that the longitudinal threads of the Only bind the second group on the paper side with such cross threads, over which the longitudinal threads of a subgroup float, which run above this longitudinal thread of the second group. In this way, a crossing of the longitudinal threads of the first and second groups avoided.
  • the corresponding is expediently also on the lower or machine side of the Dryer screen provided by the longitudinal threads of the second Float the group over those cross threads on the machine side, that tie in with the longitudinal threads of a subassembly on the machine side, which above the relevant longitudinal thread of the second Group run.
  • the longitudinal threads of a subgroup should also preferably be in the the rest are identical. It is under the term equally understand a course in which the concerned Tie longitudinal threads identically into the fabric.
  • the two contact surfaces are with Using several longitudinal threads that form sub-groups with the same binding History are summarized, generated. You can do this normal longitudinal threads, preferably as flat monofilaments with a cross-sectional ratio of 1.2: 1 to 3: 1 are used. Because the longitudinal threads despite their summary in sub-groups and their mutual contact are flexible with each other, this makes flexibility of the dryer fabric is not affected.
  • the longitudinal threads of the first group should be on the paper side Float over at least three cross threads before repositioning them involve.
  • the floatation can also be up to nine Cross threads go.
  • the longitudinal threads of the Tie the first group only with a cross thread.
  • Corresponding is also provided for the longitudinal threads of the second group, then there is a mirror image of the longitudinal threads the first group.
  • the transverse threads are designed as open hollow monofilaments, such as are known, for example, from US Pat. No. 4,251,588. It is possible to either all or only part of the cross threads as open hollow monofilaments to train. In the latter case, the other part of the Cross threads can be formed as solid monofilaments, wherein then the hollow monofilaments with the solid monofilaments should alternate, preferably always one Hollow monofilament with a solid monofilament. For the purpose of Achieving a drying screen as thin as possible can then Hollow monofilaments using a calendering process be flattened.
  • cross threads of larger diameter alternate with cross threads, which have a smaller diameter compared to that, namely preferably in such a way that always a cross thread with a larger diameters with a transverse thread smaller Diameter alternates.
  • the longitudinal threads of a subgroup are expedient opposite adjacent longitudinal threads of a subgroup in Machine direction offset with regard to their integration.
  • the longitudinal threads of the first group should be identical Have cross-sectional shape and area.
  • the production of the dryer fabric according to the invention can be done in easily done in such a way that for the weaving process shrinkable cross threads used and the dryer after Weaving process is so heat-treated that each parallel threads of a sub-group side lay side by side. It is known that plastic threads such as polyester threads or the like Exposure to heat shrink.
  • the Shrinkability is here to put the Longitudinal threads of a subgroup and also the longitudinal threads of two targeted use of neighboring sub-groups, which and practically uninterrupted contact areas arise.
  • the dryer fabric (1) shown in Figure (1) is as single layer fabric and has one in the directions machine direction of arrow A. Across this Machine direction A runs round cross threads - exemplified with (2) -. You are as Hollow monofilaments are formed, that is, in the untreated Condition cavities - designated by way of example with (3).
  • the Cross threads (2) consist of a when applying heat highly shrinkable plastic material, for example Polyester.
  • each longitudinal thread (4, 5) or (6, 7) each have a further longitudinal thread (8, 9)
  • the longitudinal threads (8, 9) the second group bind only with such paper Cross threads (2), over which the longitudinal threads (4, 5) or (6, 7) float the associated subgroup.
  • Two side by side are longitudinal threads (8, 9) of the second group with regard to their integration also by two Cross threads (2) offset in machine direction A.
  • Figure (1) shows the dryer fabric (1) in the state after Weaving process.
  • the longitudinal threads (4, 5) or (6, 7) of a sub-group then have a distance from each other that is slightly larger than the width of the longitudinal threads (8, 9) of the second group. That so manufactured dryer fabric (1) is then subjected to a heat treatment subjected to temperatures at which the transverse threads (2) shrink considerably.
  • the adjacent longitudinal threads (5, 6) of the two Subgroups then come to the plant. It arises on this Way, the fabric image according to Figure (2) by large Contact areas is marked on the paper side.
  • the dryer fabric (1) then becomes one Subjected to calendering treatment, whereby the cross threads (2) be flattened such that the inside of the cavities (3) come into mutual contact, i.e. no voids (3) there are more. This creates a very thin one Dryer screen (1) with favorable heat transfer properties.

Landscapes

  • Paper (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Woven Fabrics (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Ropes Or Cables (AREA)
  • Drying Of Solid Materials (AREA)
  • Glass Compositions (AREA)

Abstract

A dryer screen has a paper side and a machine side. A plurality of machine direction threads extend in the direction of movement of the screen. The machine direction threads are arrayed in first and second groups. The threads of the groups are bound to the screen through different binding pattern repeats. A plurality of cross threads extend generally transverse to the machine direction threads. The threads of the first group are arrayed in first and second subgroups offset with respect to the direction of movement of the screen. Each subgroup comprises at least two abutting contiguous machine direction threads having a binding pattern repeat floating on the paper side over a predetermined plurality of cross threads.

Description

Die Erfindung betrifft ein Trockensieb mit sich in Maschinenlaufrichtung erstreckenden Längsfäden und sich quer dazu erstreckenden Querfäden aus Kunststoffmaterial, wobei eine erste Gruppe von Längsfäden auf der Papierseite über mehrere Querfäden flottiert und eine zweite Gruppe von Längsfäden vorhanden ist, die unterschiedlich zur ersten Gruppe von Längsfäden einbindet.The invention relates to a dryer fabric in itself Machine direction extending longitudinal threads and across extending transverse threads made of plastic material, one first group of longitudinal threads on the paper side over several Cross threads floated and a second group of longitudinal threads that is different from the first group of Includes longitudinal threads.

Trockensiebe sind aus Kunststoffäden bestehende Gewebe mit sich in Maschinenlaufrichtung erstreckenden Längsfäden und sich quer dazu erstreckenden Querfäden. Sie werden im Trockenbereich einer Papiermaschine eingesetzt und führen dort die Papierbahn über die heißen Trockenzylinder. Dabei ist es wesentlich, daß die Trockensiebe für einen guten Wärmeübergang sorgen und eine Kondensatbildung verhindert wird. Man ist deshalb bestrebt, Trockensiebe möglichst dünn auszubilden und große Kontaktflächen zur Verfügung zu stellen.Dryer fabrics are made of plastic threads longitudinal threads extending in the machine direction and extending transversely cross threads extending thereto. You will be in the dry area used in a paper machine and guide the paper web there over the hot drying cylinders. It is essential that the dryer fabrics ensure good heat transfer and one Condensation is prevented. It is therefore endeavored Form dryer fabrics as thin as possible and large ones To provide contact areas.

Für Trockensiebe sind eine Vielzahl von Gewebekonstruktionen bekannt. Lediglich beispielhaft wird auf die PCT-Anmeldung WO 91/19⊘44 und den darin angegebenen Stand der Technik verwiesen. In dieser Druckschrift sind Papiermaschinengewebe offenbart, bei denen eine erste Gruppe von Längsfäden auf der Papierseite über mehrere Querfäden flottiert, wobei die Längsfäden als Flachmonofilamente ausgebildet sind. Diese Gruppe von Längsfäden verläuft oberhalb einer zweiten Gruppe von Längsfäden, die ebenfalls als Flachmonofilamente ausgebildet sein können.A variety of fabric constructions are available for dryer fabrics known. The PCT application is only an example WO 91 / 19⊘44 and the prior art specified therein referred. In this publication there are paper machine fabrics disclosed, in which a first group of longitudinal threads on the Paper page floated over several cross threads, the Longitudinal threads are formed as flat monofilaments. This Group of longitudinal threads runs above a second group of longitudinal threads, also called flat monofilaments can be trained.

Das bekannte Trockensieb hat zwar eine gute Kontaktfläche auf Grund der Verwendung sehr breiter Flachmonofilamente insbesondere für die Längsfäden der ersten Gruppe. Diese Fäden beeinträchtigen jedoch die Flexibilität des Trockensiebes. Außerdem handelt es sich bei den sehr breiten Flachmonofilamenten um Spezialfäden, die nicht einfach zu verarbeiten und teuer sind.The known dryer fabric has a good contact surface Because of the use of very wide flat monofilaments in particular for the longitudinal threads of the first group. These threads affect however the flexibility of the dryer fabric. Furthermore are the very wide flat monofilaments Special threads that are not easy to process and are expensive.

Der Erfindung liegt die Aufgabe zugrunde, ein Trockensieb der eingangs genannten Art so auszubilden, daß trotz großer Kontaktfläche auf der Papierseite eine gute Flexibilität erzielt wird.The invention has for its object a dryer type mentioned in such a way that despite large contact area achieved good flexibility on the paper side becomes.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß jeweils mindestens zwei benachbarte Längsfäden der ersten Gruppe Untergruppen von zumindest auf der Papierseite gleichbindend verlaufenden Längsfäden bilden und die Längsfäden einer Untergruppe Seite an Seite aneinander anliegen, und daß die Längsfäden der zweiten Gruppe nur mit solchen Querfäden papierseitig einbinden, über die die Längsfäden einer Untergruppe flottieren, welche oberhalb dieses Längsfadens der zweiten Gruppe verlaufen. Auf diese Weise wird eine Kreuzung der Längsfäden der ersten und der zweiten Gruppe vermieden. Entsprechendes ist zweckmäßigerweise auch an der Unter- bzw. Maschinenseite des Trockensiebes vorgesehen, indem die Längsfäden der zweiten Gruppe über diejenigen Querfäden maschinenseitig flottieren, die mit den Längsfäden einer Untergruppe maschinenseitig einbinden, welche oberhalb des betreffenden Längsfadens der zweiten Gruppe verlaufen.This object is achieved in that in each case at least two adjacent longitudinal threads of the first group of subgroups of those that run at least on the paper side Form longitudinal threads and the longitudinal threads of a subgroup Lying side by side, and that the longitudinal threads of the Only bind the second group on the paper side with such cross threads, over which the longitudinal threads of a subgroup float, which run above this longitudinal thread of the second group. In this way, a crossing of the longitudinal threads of the first and second groups avoided. The corresponding is expediently also on the lower or machine side of the Dryer screen provided by the longitudinal threads of the second Float the group over those cross threads on the machine side, that tie in with the longitudinal threads of a subassembly on the machine side, which above the relevant longitudinal thread of the second Group run.

Bevorzugt sollten die Längsfäden einer Untergruppe auch im übrigen gleichbindend verlaufen. Dabei ist unter dem Begriff gleichbindend ein Verlauf zu verstehen, bei dem die betreffenden Längs fäden nebeneinander identisch in das Gewebe einbinden. The longitudinal threads of a subgroup should also preferably be in the the rest are identical. It is under the term equally understand a course in which the concerned Tie longitudinal threads identically into the fabric.

Nach der Erfindung werden also die beiden Kontaktflächen mit Hilfe mehrerer Längsfäden, die zu Untergruppen mit gleichbindendem Verlauf zusammengefaßt sind, erzeugt. Dabei können hierfür normale Längsfäden, die vorzugsweise als Flachmonofilamente mit einem Querschnittsverhältnis von 1,2:1 bis 3:1 ausgebildet sind, verwendet werden. Da die Längsfäden trotz ihrer Zusammenfassung in Untergruppen und ihrer gegenseitigen Berührung untereinander beweglich sind, wird hierdurch die Flexibilität des Trockensiebes nicht beeinträchtigt.According to the invention, the two contact surfaces are with Using several longitudinal threads that form sub-groups with the same binding History are summarized, generated. You can do this normal longitudinal threads, preferably as flat monofilaments with a cross-sectional ratio of 1.2: 1 to 3: 1 are used. Because the longitudinal threads despite their summary in sub-groups and their mutual contact are flexible with each other, this makes flexibility of the dryer fabric is not affected.

In weiterer Ausbildung der Erfindung ist vorgesehen, daß zwischen zwei Untergruppen von Längsfäden der ersten Gruppe keine Längsfäden der zweiten Gruppe verlaufen. Sofern jede Untergruppe nur aus zwei Längsfäden besteht, kommen auf zwei Längsfäden der ersten Gruppe nur ein Längsfaden der zweiten Gruppe. Einerseits wird hierdurch eine Konzentrierung der Längsfäden auf der Papierseite zwecks Erzielung einer großen Kontaktfläche erreicht, andererseits ist das Trockensieb auf der Maschinenseite vergleichsweise offen, wodurch ein guter Dampfdurchgang erzielt wird.In a further embodiment of the invention it is provided that between two subgroups of longitudinal threads of the first group none Longitudinal threads of the second group run. Unless each subgroup consists of only two longitudinal threads, come on two longitudinal threads the first group only one longitudinal thread of the second group. On the one hand is thereby a concentration of the longitudinal threads the paper side to achieve a large contact area reached, on the other hand the dryer fabric is on the machine side comparatively open, which allows a good passage of steam is achieved.

Die Längsfäden der ersten Gruppe sollten papierseitig jeweils über mindestens drei Querfäden flottieren, bevor sie erneut einbinden. Die Flottierung kann jedoch auch über bis zu neun Querfäden gehen. Maschinenseitig sollten die Längsfäden der ersten Gruppe nur mit einem Querfaden einbinden. Entsprechendes ist auch für die Längsfäden der zweiten Gruppe vorgesehen, wobei sich dann ein spiegelbildlicher Verlauf zu den Längsfäden der ersten Gruppe anbietet. The longitudinal threads of the first group should be on the paper side Float over at least three cross threads before repositioning them involve. The floatation can also be up to nine Cross threads go. On the machine side, the longitudinal threads of the Tie the first group only with a cross thread. Corresponding is also provided for the longitudinal threads of the second group, then there is a mirror image of the longitudinal threads the first group.

Nach einem weiteren Merkmal der Erfindung ist vorgesehen, daß die Querfäden als offene Hohlmonofilamente ausgebildet sind, wie sie beispielsweise aus der US-PS 4 251 588 bekannt sind. Dabei besteht die Möglichkeit, entweder sämtliche oder nur einen Teil der Querfäden als offene Hohlmonofilamente auszubilden. Im letzteren Fall sollte der andere Teil der Querfäden als massive Monofilamente ausgebildet sein, wobei sich dann die Hohlmonofilamente mit den massiven Monofilamenten abwechseln sollten, und zwar vorzugsweise immer ein Hohlmonofilament mit einem massiven Monofilament. Zwecks Erzielung eines möglichst dünnen Trockensiebes können dann die Hohlmonofilamente mit Hilfe eines Kalandriervorgangs abgeplattet ausgebildet sein.According to a further feature of the invention it is provided that the transverse threads are designed as open hollow monofilaments, such as are known, for example, from US Pat. No. 4,251,588. It is possible to either all or only part of the cross threads as open hollow monofilaments to train. In the latter case, the other part of the Cross threads can be formed as solid monofilaments, wherein then the hollow monofilaments with the solid monofilaments should alternate, preferably always one Hollow monofilament with a solid monofilament. For the purpose of Achieving a drying screen as thin as possible can then Hollow monofilaments using a calendering process be flattened.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß sich Querfäden größeren Durchmessers mit Querfäden abwechseln, die dem gegenüber einen kleineren Durchmesser haben, und zwar vorzugsweise in der Weise, daß immer ein Querfaden mit einem größere Durchmesser sich mit einem Querfaden kleineren Durchmessers abwechselt.In a further embodiment of the invention it is provided that cross threads of larger diameter alternate with cross threads, which have a smaller diameter compared to that, namely preferably in such a way that always a cross thread with a larger diameters with a transverse thread smaller Diameter alternates.

Die Längsfäden einer Untergruppe sind zweckmäßigerweise gegenüber benachbarten Längsfäden einer Untergruppe in Maschinenlaufrichtung hinsichtlich ihrer Einbindung versetzt. Außerdem sollten die Längsfäden der ersten Gruppe identische Querschnittsform und -fläche haben.The longitudinal threads of a subgroup are expedient opposite adjacent longitudinal threads of a subgroup in Machine direction offset with regard to their integration. In addition, the longitudinal threads of the first group should be identical Have cross-sectional shape and area.

Obwohl für das Trockensieb auch mehrlagige Ausführungen in Frage kommen, wird die Ausbildung als einlagiges Trockensieb angestrebt, um die Dicke des Trockensiebes möglichst gering zu halten.Although multilayer versions in Question comes, the training as a single-layer dryer strived to minimize the thickness of the dryer fabric hold.

Die Herstellung des erfindungsgemäßen Trockensiebes kann in einfacher Weise dadurch geschehen, daß für den Webprozeß derart schrumpffähige Querfäden verwendet und das Trockensieb nach dem Webprozeß derart wärmebehandelt wird, daß sich die jeweils gleichbindend verlaufenden Längsfäden einer Untergruppe Seite an Seite aneinander anlegen. Bekannt ist, daß Kunststoffäden wie beispielsweise Polyesterfäden oder dergleichen bei Beaufschlagung mit Hitze einem Schrumpf unterliegen. Die Schrumpffähigkeit wird hier zum Aneinanderanlegen der Längsfäden einer Untergruppe und auch der Längsfäden von zwei benachbarten Untergruppen gezielt genutzt, wodurch großflächige und praktisch nicht unterbrochene Kontaktflächen entstehen.The production of the dryer fabric according to the invention can be done in easily done in such a way that for the weaving process shrinkable cross threads used and the dryer after Weaving process is so heat-treated that each parallel threads of a sub-group side lay side by side. It is known that plastic threads such as polyester threads or the like Exposure to heat shrink. The Shrinkability is here to put the Longitudinal threads of a subgroup and also the longitudinal threads of two targeted use of neighboring sub-groups, which and practically uninterrupted contact areas arise.

In der Zeichnung ist die Erfindung an Hand eines Ausführungsbeispiels näher veranschaulicht. Es zeigen:

Figur (1)
einen Ausschnitt eines erfindungsgemäßen Trockensiebes in perspektivischer Ansicht auf dessen Papierseite nach dem Webprozeß und vor dem Schrumpfprozeß und
Figur (2)
der Ausschnitt gemäß Figur (1) nach dem Schrumpfprozeß in gleicher Ansicht.
In the drawing, the invention is illustrated in more detail using an exemplary embodiment. Show it:
Figure (1)
a section of a dryer fabric according to the invention in a perspective view on its paper side after the weaving process and before the shrinking process and
Figure (2)
the section according to Figure (1) after the shrinking process in the same view.

Das in Figur (1) dargestellte Trockensieb (1) ist als einlagiges Gewebe ausgebildet und hat eine in den Richtungen des Pfeils A gehende Maschinenlaufrichtung. Quer zu dieser Maschinenlaufrichtung A verlaufen runde Querfäden - beispielhaft mit (2) bezeichnet -. Sie sind als Hohlmonofilamente ausgebildet, weisen also im unbehandelten Zustand Hohlräume - beispielhaft mit (3) bezeichnet - auf. Die Querfäden (2) bestehen aus einem bei Anwendung von Hitze hochschrumpffähigen Kunststoffmaterial, beispielsweise Polyester.The dryer fabric (1) shown in Figure (1) is as single layer fabric and has one in the directions machine direction of arrow A. Across this Machine direction A runs round cross threads - exemplified with (2) -. You are as Hollow monofilaments are formed, that is, in the untreated Condition cavities - designated by way of example with (3). The Cross threads (2) consist of a when applying heat highly shrinkable plastic material, for example Polyester.

Mit den Querfäden (2) binden in Maschinenlaufrichtung A gehende Längsfäden ein, die als Flachmonofilamente mit rechteckigem Querschnitt ausgebildet sind. Eine erste Gruppe von Längsfäden - beispielhaft mit (4, 5, 6, 7) bezeichnet - flottiert jeweils über drei Querfäden auf der Papierseite, bevor die Längsfäden (4, 5, 6, 7) mit einem Querfaden (2) untenseitig auf der Maschinenseite einbinden. Dabei verlaufen jeweils zwei nebeneinanderliegende Längsfäden (4, 5) bzw. (6, 7) gleichbindig, haben also einen identischen und immer parallel zueinander gehenden Verlauf. Jeweils zwei Längsfäden (4, 5) bzw. (6, 7) bilden damit Untergruppen in der ersten Gruppe von Längsfäden (4, 5, 6, 7), wobei die Untergruppen nebeneinander verlaufen, jedoch in Maschinenlaufrichtung A jeweils um zwei Querfäden (2) versetzt sind.Tie with the transverse threads (2) in the machine running direction A. Longitudinal threads used as flat monofilaments with a rectangular Cross section are formed. A first group of longitudinal threads - exemplified with (4, 5, 6, 7) - floats in each case over three cross threads on the paper side before the longitudinal threads (4, 5, 6, 7) with a transverse thread (2) on the underside on the Integrate the machine side. Two each run adjacent longitudinal threads (4, 5) or (6, 7) identical, so have an identical and always parallel progressive course. Two longitudinal threads each (4, 5) or (6, 7) thus form subgroups in the first group of Longitudinal threads (4, 5, 6, 7), with the sub-groups side by side run, but in the machine direction A by two Cross threads (2) are offset.

Zwischen zwei eine Untergruppe bildenden Längsfäden (4, 5) bzw. (6, 7) verläuft jeweils ein weiterer Längsfaden (8, 9), die zusammen eine zweite Gruppe von Längsfäden bilden. Sie haben einen zu den Längsfäden (4, 5) bzw. (6, 7) der ersten Gruppe spiegelbildlichen Verlauf, d. h. sie binden jeweils nur mit einem Querfaden (2) an der Papierseite ein und flottieren dann maschinenseitig über drei Querfäden (2). Die Längsfäden (8, 9) der zweiten Gruppe binden dabei papierseitig nur mit solchen Querfäden (2) ein, über die die Längsfäden (4, 5) bzw. (6, 7) der zugehörigen Untergruppe flottieren. Zwei nebeneinander verlaufende Längsfäden (8, 9) der zweiten Gruppe sind hinsichtlich ihrer Einbindung ebenfalls um jeweils zwei Querfäden (2) in Maschinenlaufrichtung A versetzt.Between two longitudinal threads (4, 5) or (6, 7) each have a further longitudinal thread (8, 9), the together form a second group of longitudinal threads. They have one to the longitudinal threads (4, 5) or (6, 7) of the first group mirror image, d. H. they only bind a cross thread (2) on the paper side and then float on the machine side via three cross threads (2). The longitudinal threads (8, 9) the second group bind only with such paper Cross threads (2), over which the longitudinal threads (4, 5) or (6, 7) float the associated subgroup. Two side by side are longitudinal threads (8, 9) of the second group with regard to their integration also by two Cross threads (2) offset in machine direction A.

Figur (1) zeigt das Trockensieb (1) im Zustand nach dem Webprozeß. Die Längsfäden (4, 5) bzw. (6, 7) einer Untergruppe haben dann einen Abstand zueinander, der etwas größer ist als die Breite der Längsfäden (8, 9) der zweiten Gruppe. Das so hergestellte Trockensieb (1) wird dann einer Wärmebehandlung bei Temperaturen unterzogen, bei denen die Querfäden (2) erheblich schrumpfen. Dies hat zur Folge, daß die Längsfäden (4, 5) bzw. (6, 7) gegenseitig zur Anlage kommen, wobei sie sich an der Papierseite über die Längsfäden (8, 9) der zweiten Gruppe und an der Maschinenseite zwischen den jeweiligen Querfaden (2) und den jeweils dort flottierenden Längsfaden (8, 9) schieben. Auch die benachbarten Längsfäden (5, 6) der beiden Untergruppen kommen dann zur Anlage. Es entsteht auf diese Weise das Gewebebild gemäß Figur (2), das durch große Kontaktflächen auf der Papierseite gekennzeichnet ist.Figure (1) shows the dryer fabric (1) in the state after Weaving process. The longitudinal threads (4, 5) or (6, 7) of a sub-group then have a distance from each other that is slightly larger than the width of the longitudinal threads (8, 9) of the second group. That so manufactured dryer fabric (1) is then subjected to a heat treatment subjected to temperatures at which the transverse threads (2) shrink considerably. This has the consequence that the longitudinal threads (4, 5) and (6, 7) come into contact with each other, whereby they on the paper side over the longitudinal threads (8, 9) of the second Group and on the machine side between the respective Transverse thread (2) and the longitudinal thread (8, 9) push. The adjacent longitudinal threads (5, 6) of the two Subgroups then come to the plant. It arises on this Way, the fabric image according to Figure (2) by large Contact areas is marked on the paper side.

Das Trockensieb (1) wird anschließend einer Kalandrierbehandlung unterworfen, wodurch die Querfäden (2) derart flachgedrückt werden, daß die Innenseiten der Hohlräume (3) zur gegenseitigen Anlage kommen, also keine Hohlräume (3) mehr vorhanden sind. Dabei entsteht dann ein sehr dünnes Trockensieb (1) mit günstigen Wärmeübertragungseigenschaften.The dryer fabric (1) then becomes one Subjected to calendering treatment, whereby the cross threads (2) be flattened such that the inside of the cavities (3) come into mutual contact, i.e. no voids (3) there are more. This creates a very thin one Dryer screen (1) with favorable heat transfer properties.

Claims (19)

  1. Dryer fabric (1) having longitudinal filaments (4, 5, 6, 7, 8, 9) extending in the machine operating direction (A) and transverse filaments (2) extending transversely thereto, both being made of plastic material, a first group of longitudinal filaments (4, 5, 6, 7) floating over a plurality of transverse filaments (2) on the paper side and there being a second group of longitudinal filaments (8, 9) which intersects differently from the first group of longitudinal filaments (4, 5, 6, 7), characterized in that in each case at least two adjacent longitudinal filaments (4, 5) and (6, 7) of the first group form subgroups of longitudinal filaments (4, 5) and (6, 7) that run and intersect in the same order, at least on the paper side, and the longitudinal filaments (4, 5) and (6, 7) of one subgroup rest against one another side by side, and in that the longitudinal filaments (8, 9) of the second group intersect on the paper side only with those transverse filaments (2) over which the longitudinal filaments (4, 5) and (6, 7) of a subgroup, which run above this longitudinal filament (8, 9) of the second group, float.
  2. Dryer fabric according to Claim 1, characterized in that the longitudinal filaments (4, 5) and (6, 7) of a subgroup also otherwise run so as to intersect in the same order.
  3. Dryer fabric according to Claim 1 or 2, characterized in that no longitudinal filaments of the second group run between two subgroups of longitudinal filaments (4, 5) and (6, 7) of the first group.
  4. Dryer fabric according to one of Claims 1 to 3, characterized in that the longitudinal filaments (8, 9) of the second group float on the machine side over those transverse filaments (2) which intersect on the machine side with the longitudinal filaments (4, 5) and (6, 7) of a subgroup which run above the relevant longitudinal filament (8, 9) of the second group.
  5. Dryer fabric according to one of Claims 1 to 4, characterized in that the longitudinal filaments (8, 9) of the first group in each case float on the paper side over three to nine transverse filaments (2).
  6. Dryer fabric according to one of Claims 1 to 5, characterized in that the longitudinal filaments (4, 5, 6, 7) of the first group in each case intersect on the machine side only with one transverse filament (2).
  7. Dryer fabric according to one of Claims 1 to 6, characterized in that the longitudinal filaments (8, 9) of the second group float on the machine side over three to nine transverse filaments (2).
  8. Dryer fabric according to one of Claims 1 to 7, characterized in that the longitudinal filaments (8, 9) of the second group in each case intersect on the paper side only with one transverse filament (2).
  9. Dryer fabric according to one of Claims 1 to 8, characterized in that the longitudinal filaments (4, 5, 6, 7) of the first group intersect in mirror-image fashion in relation to the longitudinal filaments (8, 9) of the second group.
  10. Dryer fabric according to one of Claims 1 to 9, characterized in that the transverse filaments (2) are constructed as open, hollow monofilaments.
  11. Dryer fabric according to one of Claims 1 to 9, characterized in that transverse filaments which are constructed as open, hollow monofilaments alternate with transverse filaments that are constructed as solid monofilaments.
  12. Dryer fabric according to Claim 10 or 11, characterized in that the transverse filaments (2) constructed as hollow monofilaments are flattened.
  13. Dryer fabric according to one of Claims 1 to 12, characterized in that transverse filaments of greater diameter alternate with transverse filaments which by comparison have a smaller diameter.
  14. Dryer fabric according to one of Claims 1 to 13, characterized in that at least the longitudinal filaments (4, 5, 6, 7) of the first group are constructed as flat monofilaments whose extent in the plane of the fabric is greater than perpendicular thereto.
  15. Dryer fabric according to Claim 14, characterized in that the longitudinal filaments (4, 5, 6, 7) have a cross-sectional ratio of 1.2:1 to 3:1.
  16. Dryer fabric according to one of Claims 1 to 15, characterized in that the longitudinal filaments (4, 5) or (6, 7) of a subgroup are offset with regard to their intersection in the machine operating direction with respect to adjacent longitudinal filaments (4, 5) or (6, 7) of another subgroup.
  17. Dryer fabric according to one of Claims 1 to 16, characterized in that the longitudinal filaments (4, 5, 6, 7) of the first group have an identical cross-sectional shape and area.
  18. Dryer fabric according to one of Claims 1 to 17, characterized in that the dryer fabric is of single-ply construction.
  19. Process for producing a dryer fabric according to one of Claims 1 to 18, characterized in that the transverse filaments (2) used for the weaving process are capable of shrinking, and the dryer fabric (1) is heat-treated following the weaving process, both in such a way that the longitudinal filaments (4, 5) and (6, 7) of a subgroup in each case running and intersecting in the same order rest against one another side by side.
EP19940100333 1993-01-26 1994-01-12 Dryer cloth and process for making the same Expired - Lifetime EP0609664B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4302031 1993-01-26
DE4302031A DE4302031C1 (en) 1993-01-26 1993-01-26 Fourdrinier for paper mfg. machine for large contact surface area - comprises oven plastics filaments with gp. in sub-gps. shrunk for longitudinal filaments side by side, for flexibility

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EP0609664A1 EP0609664A1 (en) 1994-08-10
EP0609664B1 true EP0609664B1 (en) 1998-04-01

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US5465764A (en) 1995-11-14
FI96885C (en) 1996-09-10
NO940262L (en) 1994-07-27
CA2113985A1 (en) 1994-07-27
NO940262D0 (en) 1994-01-25
FI96885B (en) 1996-05-31
DE59405551D1 (en) 1998-05-07
EP0609664A1 (en) 1994-08-10
FI940377A (en) 1994-07-27
ATE164648T1 (en) 1998-04-15
CA2113985C (en) 2005-07-26
DE4302031C1 (en) 1993-12-16
FI940377A0 (en) 1994-01-26

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