EP0264881A1 - Fabric for the wet end of a paper-making machine - Google Patents

Fabric for the wet end of a paper-making machine Download PDF

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Publication number
EP0264881A1
EP0264881A1 EP87115267A EP87115267A EP0264881A1 EP 0264881 A1 EP0264881 A1 EP 0264881A1 EP 87115267 A EP87115267 A EP 87115267A EP 87115267 A EP87115267 A EP 87115267A EP 0264881 A1 EP0264881 A1 EP 0264881A1
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EP
European Patent Office
Prior art keywords
threads
transverse
thread
longitudinal
lower layer
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Granted
Application number
EP87115267A
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German (de)
French (fr)
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EP0264881B1 (en
Inventor
Georg Dipl.-Ing. Borel
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Herman Wangner GmbH and Co KG
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Herman Wangner GmbH and Co KG
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Priority to AT87115267T priority Critical patent/ATE62948T1/en
Publication of EP0264881A1 publication Critical patent/EP0264881A1/en
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Publication of EP0264881B1 publication Critical patent/EP0264881B1/en
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    • 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
    • Y10S162/04—Pitch control
    • 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

Definitions

  • the invention relates to a covering for the sheet forming part of a paper machine, e.g. a so-called sheet forming sieve.
  • the covering consists of a double-layer fabric, i.e. there are two layers of cross threads and the longitudinal threads are interwoven with each of the two layers of cross threads.
  • the transverse threads are predominantly visible both on the running side and on the paper side.
  • the longitudinal threads are bound twice per repeat in the upper layer of the cross threads.
  • the transverse threads lie over at least 80% of the longitudinal threads. The fact that the number of transverse threads on the running side is only half as large as that on the paper side is compensated for by the larger diameter of the transverse threads in the lower layer.
  • Such a sheet forming screen is known from DE-A-2,706,235 (Fig. 2F).
  • the longitudinal threads run relatively flat in spite of being bound twice into the upper layer in the interior of the fabric, and this has the consequence that the woven seam with which the two ends of the fabric are joined together to form an endless band with a flat weave has a relatively low strength .
  • the woven seam is quickly destroyed when cleaning with a high pressure water jet from the running side. The places where the longitudinal and warp thread ends meet within the woven seam are arbitrarily ver within the woven seam Splits.
  • each joint is an interruption of the warp thread, so that the transverse or weft thread of the lower layer is not held at the joint of the warp thread ends and is increasingly ground down to a width that corresponds to two weave repeats .
  • the unbound free warp thread ends are very quickly shredded and destroyed when the paper machine screen is cleaned with a high-pressure water jet.
  • a double-layered forming screen is known in which the longitudinal threads are bound twice per repeat in the upper layer of the transverse threads, but only once in the lower layer of the transverse threads.
  • This sheet forming screen has the same number of transverse threads in the upper and lower layers, so that the double integration of the longitudinal threads in the upper layer of the transverse threads results in a shortening of the transverse thread floats on the paper side. This is noticeable by a poor removal of the paper web from the sheet forming screen.
  • a similar sheet forming sieve is also known from DE-B-2,263,476, the longitudinal threads being bound two or three times in the upper layer. In the lower layer, the longitudinal threads run under two or three transverse threads and are therefore exposed to heavy wear. In DE-B-2,540,490 this is corrected in such a way that each longitudinal thread binds at most with every sixth transverse thread of the lower layer.
  • the low drainage performance and the poor sheet removal, particularly in the case of tissue paper are also disadvantageous.
  • the invention has for its object to provide a covering for the sheet forming part of a paper machine, which is characterized by an improved combination of retention, drainage performance and sheet removal.
  • this object is achieved in that the longitudinal threads per repeat are integrated twice in the lower layer and that two adjacent longitudinal threads lie together at each binding point, and thereby one longitudinal thread at one binding point together with the preceding longitudinal thread and the next tie-in point together with the following longitudinal thread and each longitudinal thread runs between two ties over at least one cross thread of the lower layer.
  • the floating length of the upper transverse threads is not shortened in the sheet forming sieve according to the invention by the multiple integration of the longitudinal threads.
  • the double inclusion of the longitudinal threads in the upper layer makes the surface of the fabric more closed, but surprisingly the permeability does not decrease, but becomes even larger. This may be due to the fact that the paper side consists of a large number of transverse threads and each transverse thread of the upper layer is tied only once per repeat by a longitudinal thread. This means that the transverse thread floatations remain highly monoplanar compared to the longitudinal thread offset.
  • the offset of the longitudinal threads becomes even smaller and that of the transverse threads always larger, ie the transverse threads protrude on the paper side and, depending on the construction of the fabric, also on the running side.
  • the sheet forming screen is then monoplanet on the paper side, and the fibrous web is carried by the cross threads (cross thread or weft carrier). If the same effect also takes place on the running side, the cross threads absorb the abrasion (cross thread or weft runner).
  • monoplanarity or over-monoplanarity cannot be achieved by heat-setting, since there the longitudinal threads are formed by the weft and therefore already lie in the tissue due to the weaving process.
  • the pronounced transverse structure of the paper side of the covering according to the invention in conjunction with the excess monoplanarity, provides good support for the paper web which is being formed and at the same time facilitates the removal of the paper web from the sheet-forming screen. This is particularly important for very thin tissue papers with low tensile strength.
  • the high permeability of the fabric is of equal importance for the production of tissue papers. At paper machine working speeds of 1500 to 1800 m / min and the high thinning of the paper pulp, large amounts of water have to be drained through the fabric within short drainage distances and within a very short time, especially in the production of tissue papers.
  • the covering according to the invention is particularly suitable for use on twin-wire paper machines. It has been shown that in the paper machine clothing according to the invention, the above-mentioned ejection of the white water at the first deflection points is significantly reduced. The reason for this is not clear. In the case of coverings according to the prior art, in which each longitudinal thread per repeat is integrated only once in the lower layer, the lower half of the fabric is formed almost exclusively from free-standing transverse thread offsets, since the longitudinal threads once again lead diagonally upwards to the paper side will.
  • the otherwise very open barrel side is partially sealed, so that the entrainment of water and the subsequent ejection at the deflection points is considerably reduced. Nevertheless, the fabric on the running side remains a cross thread runner.
  • the floats of the transverse threads between the binding points of the longitudinal threads are very long on the running side, and at the binding points two longitudinal threads with a combined longitudinal tension act on the transverse threads and bend them off.
  • the paper machine clothing according to the invention is particularly suitable for the production of fine tissue papers on twin-wire paper machines.
  • the sheet forming sieve according to the invention is also suitable for writing and printing papers, since with sufficient permeability it enables extremely high transverse thread numbers in the upper layer, which improves the retention of the paper stock and the marking. Because of the improved retention, this is the invention
  • Sheet forming screen can also be used for so-called "brown" paper types, ie for kraft papers, packaging papers based on waste paper and for cardboard.
  • the binding is also 7-, 8-, 14- or 18-strand based on the transverse threads of the lower layer.
  • transverse threads of the lower layers are expediently of a larger diameter.
  • the diameter of these transverse threads is chosen only so large that the longitudinal threads can still provide sufficient cranking of these transverse threads and that the longitudinal threads are thereby largely removed from abrasion. This offset takes place only when the covering is fixed, so that the fixing tension must be chosen accordingly in order to give the sheet-forming sieve the property of a transverse thread runner.
  • the covering according to the invention is expediently produced in an open weave, so that the transverse threads are then the weft threads and the longitudinal threads are the warp threads.
  • the production of a cross thread runner by circular weaving encounters additional difficulties, but is also possible, but requires looms with a very high number of shafts or a thread divider according to DE-C-3 108 189.
  • transverse threads of the upper and lower layers and the longitudinal threads are expediently plastic monofilaments, in particular polyester monofilaments.
  • the transverse threads of the lower layer and possibly also of the upper layer can partly. also consist of polyamide.
  • the embodiment has an upper layer 1 of transverse threads 3 and a lower layer 2 of transverse threads 4.
  • the number of transverse threads in the upper layer 1 is twice as high as in the lower layer 2, so that in the upper layer 1 a cross thread 3a lies above a cross thread 4 of the lower layer 2 and the next cross thread 3b in the middle over two cross threads 4 the lower layer 2 is.
  • Longitudinal threads 5 connect the upper layer 1 and the lower layer 2.
  • the weave repeat extends over sixteen transverse threads 3 of the upper layer or eight transverse threads 4 of the lower layer. Beginning at the left edge of the illustration, the longitudinal thread 5 runs over a transverse thread 3a of the upper layer 1, then under two transverse threads 3b and 3a of the upper layer 1, over a transverse thread 3b of the upper layer 1, then binds with the fifth transverse thread 4 of the lower layer 2, runs between the two layers 1, 2, binds with the eighth cross thread 4 of the lower layer 2 and finally runs diagonally upwards in order to bind again with the first cross thread 3a of the upper layer 1 in the next binding repeat.
  • Each longitudinal thread 5 thus binds within a weave repeat with a transverse thread 3a, which is above a cross thread 4 of the lower layer 2, and with a transverse thread 3b, which lies in the middle over two transverse threads 4 of the lower layer.
  • a transverse thread 3a and 3b of the upper layer, with which the longitudinal thread 5 binds there must therefore be two, four or another even number of transverse threads, so that the condition is met that each longitudinal thread binds with a transverse thread 3a within one repeat, which lies over a transverse thread 4 of the lower layer 2, and sets with a transverse thread 3b which lies in the middle over two transverse threads 4 of the lower layer 2.
  • FIG. 2 The binding pattern of the paper side is shown in Fig. 2. It can be seen that adjacent longitudinal threads 5 are each offset by six transverse threads in the longitudinal direction and each weave repeat comprises eight longitudinal threads 5.
  • Fig. 3 shows a bottom view of the running side of the embodiment of Fig. 1 and 2.
  • two longitudinal threads 5 are together and bind together a transverse thread 4 of the lower layer 2.
  • the integration takes place at a binding point with the longitudinal thread 5 lying to the left and at the next binding point lying higher up in FIG. 3 with the longitudinal thread lying to the right.
  • the two bindings of the longitudinal thread 5 in the upper layer 1 follow one another directly, that is, without the binding of the longitudinal thread 5 in the lower layer 2 in between he follows.
  • the two inclusions of the longitudinal thread 5 in the lower layer 2 follow one another directly.
  • Fig. 4 an embodiment is shown in which the longitudinal thread 5 are alternately bound in the upper layer 1 and in the lower layer 2, so that between two ties in the upper layer 1, the longitudinal thread 5 is incorporated in the lower layer 2 . 4 shows the course of two adjacent longitudinal threads 5.
  • the fabric has the 8-strand weave shown in FIGS. 1 to 3 and is woven open.
  • the longitudinal threads 5 consist of polyester monofilament 0.15 mm in diameter and are arranged in a density of 68 threads / cm.
  • the transverse threads 3 of the upper layer 1 consist of polyester monofilament of 0.14 mm diameter and are arranged in a density of 42 threads / cm.
  • the transverse threads 4 of the lower layer 2 consist alternately of polyester monofilament and polyamide 6.6 monofilament with a diameter of 0.18 mm and are arranged in a density of 21 threads / cm.
  • the fixation is carried out at a temperature of about 200 ° C and with such a tension that the longitudinal thread 5 is shifted both on the paper side and on the running side in the direction of the interior of the fabric, so that it is not exposed to abrasion on the running side and does not interfere with the sheet removal on the paper side.
  • the tissue lengthens by approx. 8%.
  • the offset height of the longitudinal threads 5 decreases, and the longitudinal threads shift into the interior of the fabric.
  • the transverse threads 3 and 4 are bent by the tension of the longitudinal threads 5, the width of the fabric being reduced by approximately 11%.
  • the transverse threads 3, 4 bulge outwards at the long floats and form the desired supermonoplane structure on the paper side and on the running side.

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  • Paper (AREA)
  • Woven Fabrics (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Catalysts (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Cartons (AREA)
  • Soil Working Implements (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

Es wird eine Bespannung für den Blattbildungsteil einer Papiermaschine mit zwei Lagen (1, 2) von Querfäde n (3, 4) und mit Längsfäden (5) beschrieben, die mit beiden Lagen (1, 2) von Querfäden (3, 4) verwoben sind. Sowohl die Papierseite als auch die Laufseite hat eine Querstruktur und die Querfadenzahl der oberen Lage (1) ist doppelt so groß wie die der unteren Lage (2). Die Längsfäden (5) sind pro Rapport zweimal in die obere Lage (1) und in die untere Lage (2) eingewoben. Die Einbindung in die obere Lage (1) erfolgt dabei einmal mit einem Querfaden (3a), der über einem Querfaden (4) der unteren Lage (2) liegt, und das andere Mal mit einem Querfaden (3b), der in der Mitte über zwei Querfäden (4) der unteren Lage (2) liegt. Bei der Einbindung der unteren Lage (2) liegen jeweils zwei benachbarte Längsfäden (5) beisammen, wobei ein Längsfaden (5) bei einer Einbindestelle zusammen mit dem vorausgehenden Längsfaden (5) und bei der nächsten Einbindestelle zusammen mit dem nachfolgenden Längsfaden (5) abbindet.A covering for the sheet-forming part of a paper machine with two layers (1, 2) of transverse threads (3, 4) and with longitudinal threads (5) is described which are woven with both layers (1, 2) of transverse threads (3, 4) are. Both the paper side and the running side have a transverse structure and the number of transverse threads of the upper layer (1) is twice as large as that of the lower layer (2). The longitudinal threads (5) are woven twice into the upper layer (1) and the lower layer (2) per repeat. The integration in the upper layer (1) takes place once with a transverse thread (3a), which lies above a transverse thread (4) of the lower layer (2), and the other time with a transverse thread (3b), which lies in the middle two cross threads (4) of the lower layer (2). When the lower layer (2) is integrated, two adjacent longitudinal threads (5) lie together, one longitudinal thread (5) binding together with the preceding longitudinal thread (5) at one binding point and together with the subsequent longitudinal thread (5) at the next binding point .

Description

Die Erfindung betrifft eine Bespannung für den Blattbildungsteil einer Papiermaschine, z.B. ein sog. Blattbildungssieb. Die Bespannung besteht aus einem doppellagigen Gewebe, d.h., es sind zwei Lagen von Querfäden vorhanden und die Längsfäden sind mit jeder der beiden Lagen von Querfäden verwoben. Sowohl auf der Laufseite als auch auf der Papierseite sind überwiegend die Querfäden sichtbar. Die Längsfäden sind dabei je Rapport zweimal in die obere Lage der Querfäden eingebunden. Auf der Papierseite liegen die Querfäden über mindestens 80 % der Längsfäden. Daß die Anzahl der Querfäden auf der Laufseite nur halb so groß ist wie die auf der Papierseite, wird durch den größeren Durchmesser der Querfäden der unteren Lage ausgeglichen.The invention relates to a covering for the sheet forming part of a paper machine, e.g. a so-called sheet forming sieve. The covering consists of a double-layer fabric, i.e. there are two layers of cross threads and the longitudinal threads are interwoven with each of the two layers of cross threads. The transverse threads are predominantly visible both on the running side and on the paper side. The longitudinal threads are bound twice per repeat in the upper layer of the cross threads. On the paper side, the transverse threads lie over at least 80% of the longitudinal threads. The fact that the number of transverse threads on the running side is only half as large as that on the paper side is compensated for by the larger diameter of the transverse threads in the lower layer.

Ein derartiges Blattbildungssieb ist aus der DE-A-2,706,235 (Fig. 2F) bekannt. Bei diesem bekannten Blattbildungssieb verlaufen die Längsfäden trotz des zweimaligen Einbindens in die obere Lage im Gewebeinneren relativ flach, und dies hat zur Folge, daß die Webnaht, mit der bei flacher Webweise die beiden Gewebeenden zu einem endlosen Band zusammengefügt werden, eine relativ geringe Festigkeit besitzt. Außerdem wird die Webnaht bei Reinigung mit Hochdruckwasserstrahl von der Laufseite her rasch zerstört. Die Stellen, an denen sich innerhalb der Webnaht die Längs- und Kettfadenenden treffen, sind innerhalb der Webnaht beliebig ver teilt. Die Kettfadenenden liegen an der Stoßstelle offen nebeneinander, d.h., jede Stoßstelle ist eine Unterbrechung des Kettfadens, so daß der Quer- oder Schußfaden der unteren Lage an der Stoßstelle der Kettfadenenden nicht gehalten wird und auf einer Breite, die zwei Bindungsrapporten entspricht, verstärkt abgeschliffen wird. Die ungebundenen freien Kettfadenenden werden beim Reinigen des Papiermaschinensiebes mit Hochdruckwasserstrahl sehr rasch zerfasert und zerstört.Such a sheet forming screen is known from DE-A-2,706,235 (Fig. 2F). In this known sheet forming screen, the longitudinal threads run relatively flat in spite of being bound twice into the upper layer in the interior of the fabric, and this has the consequence that the woven seam with which the two ends of the fabric are joined together to form an endless band with a flat weave has a relatively low strength . In addition, the woven seam is quickly destroyed when cleaning with a high pressure water jet from the running side. The places where the longitudinal and warp thread ends meet within the woven seam are arbitrarily ver within the woven seam Splits. The ends of the warp threads lie openly next to each other at the joint, that is, each joint is an interruption of the warp thread, so that the transverse or weft thread of the lower layer is not held at the joint of the warp thread ends and is increasingly ground down to a width that corresponds to two weave repeats . The unbound free warp thread ends are very quickly shredded and destroyed when the paper machine screen is cleaned with a high-pressure water jet.

Aus der EP-A-30 490 ist ein doppellagiges Blattbildungssieb bekannt, bei dem die Längsfäden zweimal je Rapport in die obere Lage der Querfäden, jedoch nur einmal in die die untere Lage der Querfäden eingebunden sind. Dieses Blattbildungssieb weist in der oberen und unteren Lage die gleiche Anzahl von Querfäden auf, so daß die zweimalige Einbindung der Längsfäden in die obere Lage der Querfäden eine Verkürzung der Querfadenflottungen auf der Papierseite zur Folge hat. Dies macht sich durch eine schlechte Abnahme der Papierbahn vom Blattbildungssieb bemerkbar.From EP-A-30 490 a double-layered forming screen is known in which the longitudinal threads are bound twice per repeat in the upper layer of the transverse threads, but only once in the lower layer of the transverse threads. This sheet forming screen has the same number of transverse threads in the upper and lower layers, so that the double integration of the longitudinal threads in the upper layer of the transverse threads results in a shortening of the transverse thread floats on the paper side. This is noticeable by a poor removal of the paper web from the sheet forming screen.

Ein ähnliches Blattbildungssieb ist ferner aus der DE-B-2,263,476 bekannt, wobei die Längsfäden zwei- oder dreimal in die obere Lage eingebunden sind. In der unteren Lage verlaufen die Längsfäden unter zwei oder drei Querfäden und sind dadurch einem starken Verschleiß ausgesetzt. In der DE-B-2,540,490 wird dies in der Weise korrigiert, daß jeder Längsfaden höchstens mit jedem sechsten Querfaden der unteren Lage abbindet. Nachteilig ist jedoch weiterhin die geringe Entwässerungsleistung und die schlechte Blattabnahme insbesondere bei Tissuepapier.A similar sheet forming sieve is also known from DE-B-2,263,476, the longitudinal threads being bound two or three times in the upper layer. In the lower layer, the longitudinal threads run under two or three transverse threads and are therefore exposed to heavy wear. In DE-B-2,540,490 this is corrected in such a way that each longitudinal thread binds at most with every sixth transverse thread of the lower layer. However, the low drainage performance and the poor sheet removal, particularly in the case of tissue paper, are also disadvantageous.

Bei der Papierherstellung auf Doppelsiebpapiermaschinen wirkt sich störend aus, daß sich die Innenseite der Papiermaschinensiebbespannung mit dem durchströmenden Wasser füllt und dieses Wasser bei der Umlenkung der Bespannung aus den Maschen der unteren Lage herausgeschleudert wird. Infolge der hohen Geschwindigkeiten von 1500 bis 1800 m/min, mit denen Doppelsiebpapiermaschinen laufen, entsteht durch das herausgeschleuderte Wasser ein dichter Wassernebel an der ersten Umlenkstelle der Bespannung.When making paper on twin-wire paper machines has a disruptive effect that the inside of the paper machine fabric is filled with the water flowing through and this water is thrown out of the meshes of the lower layer when the fabric is deflected. As a result of the high speeds of 1500 to 1800 m / min at which twin-wire paper machines run, the water thrown out creates a dense water mist at the first deflection point of the fabric.

Aus der EP-A-80 686 ist es bekannt, bei einem doppellagigen Blattbildungssieb für eine Papiermaschine die Längsfäden in jedem Rapport zweimal in die untere Lage einzubinden, und zwar das erste Mal zusammen mit dem vorausgehenden Längsfaden und das nächste Mal zusammen mit dem nachfolgenden Längsfaden, wobei der Längsfaden zwischen zwei Einbindung en über mindestens einem Querfaden der unteren Lage verläuft. Durch diese Art der Abbindung soll sichergestellt werden, daß das Blattbildungssieb ein Querfadenläufer ist und eine dementsprechend höhere Laufzeit besitzt.From EP-A-80 686 it is known to bind the longitudinal threads in each repeat twice in the lower layer in a double-layered sheet forming screen for a paper machine, for the first time together with the preceding longitudinal thread and the next time together with the subsequent longitudinal thread , wherein the longitudinal thread runs between two bindings over at least one transverse thread of the lower layer. This type of binding is intended to ensure that the sheet forming screen is a cross thread runner and accordingly has a longer run time.

Der Erfindung liegt die Aufgabe zugrunde, eine Bespannung für den Blattbildungsteil einer Papiermaschine zu schaffen, das sich durch eine verbesserte Kombination von Retention, Entwässerungsleistung und Blattabnahme auszeichnet.The invention has for its object to provide a covering for the sheet forming part of a paper machine, which is characterized by an improved combination of retention, drainage performance and sheet removal.

Ausgehend von einer Bespannung der eingangs genannten Art wird diese Aufgabe dadurch gelöst, daß die Längsfäden pro Rapport zweimal in die untere Lage eingebunden sind und daß an jeder Einbindestelle zwei benachbarte Längsfäden zusammenliegen, und dabei ein Längsfaden an einer Einbindestelle zusammen mit dem vorausgehenden Längsfaden und an der nächsten Einbindestelle zusammen mit dem nachfolgenden Längsfaden einbindet und jeder Längsfaden zwischen zwei Einbindungen über mindestens einen Querfaden der unteren Lage läuft.Starting from a covering of the type mentioned above, this object is achieved in that the longitudinal threads per repeat are integrated twice in the lower layer and that two adjacent longitudinal threads lie together at each binding point, and thereby one longitudinal thread at one binding point together with the preceding longitudinal thread and the next tie-in point together with the following longitudinal thread and each longitudinal thread runs between two ties over at least one cross thread of the lower layer.

Im Vergleich zu einem Blattbildungssieb mit gleicher Anzahl von Querfäden in der oberen und unteren Lage wird bei dem erfindungsgemäßen Blattbildungssieb die Flottungslänge der oberen Querfäden durch die mehrfache Einbindung der Längsfäden nicht verkürzt. Durch die zweifache Einbindung der Längsfäden in die obere Lage wird die Oberfläche des Gewebes zwar geschlossener, überraschenderweise nimmt die Durchläßigkeit jedoch nicht ab, sondern wird sogar noch größer. Dies dürfte darauf zurückzuführen sein, daß die Papierseite aus einer großen Anzahl querverlaufender Fäden besteht und jeder Querfaden der oberen Lage nur einmal pro Rapport durch einen Längsfaden abgebunden wird. Somit bleiben die Querfadenflottungen stark übermonoplan gegenüber den Längsfadenabkröpfungen. Der Ausdruck "übermonoplan" leitet sich davon ab, daß bei offener Webweise die Querfäden (Schuß) zunächst gerade im Gewebe liegen und die Abkröpfungen der Längsfäden (Kette) auf beiden Seiten des Gewebes hervorstehen. Beim Thermofixieren des Gewebes wird dann auf die Längsfäden eine hohe Spannung ausgeübt, so daß diese versuchen, einen geraden Verlauf einzunehmen. Dabei verformen sie die Querfäden und kröpfen diese ab, was als Kröpfungswechsel bezeichnet wird. Häufig werden Blattbildungssiebe mit solcher Längsspannung thermofixiert, daß die obersten Punkte der Längsfäden und der Querfäden in einer Ebene liegen; das Gewebe ist dann monoplan. Wird die Thermofixierung über diesen Punkt hinaus fortgesetzt, so wird die Abkröpfung der Längsfäden noch kleiner und die der Querfäden immer größer, d.h., die Querfäden stehen auf der Papierseite und je nach Konstruktion des Gewebes auch auf der Laufseite hervor. Das Blattbildungssieb ist dann auf der Papierseite übermonoplan, und die Faserbahn wird von den Querfäden getragen (Querfaden- oder Schußträger). Findet der gleiche Effekt auch auf der Laufseite statt, so nehmen die Querfäden den Abrieb auf (Querfaden- oder Schußläufer). Bei endlos gewebten Blattbildungssieben kann durch Thermofixieren keine Monoplanität oder Übermonoplanität erreicht werden, da dort die Längsfäden vom Schuß gebildet werden und daher bereits durch den Webprozeß gerade im Gewebe liegen. Die ausgeprägte Querstruktur der Papierseite der erfindungsgemäßen Bespannung ergibt in Verbindung mit der Übermonoplanität eine gute Abstützung der sich bildenden Papierbahn und erleichtert gleichzeitig die Abnahme der Papierbahn vom Blattbildungssieb. Dies ist besonders bei sehr dünnen Tissue-Papieren mit geringer Zugfestigkeit von Bedeutung. Von gleichrangiger Wichtigkeit ist für die Herstellung von Tissue-Papieren die hohe Durchlässigkeit des Gewebes. Bei Arbeitsgeschwindigkeiten der Papiermaschine von 1500 bis 1800 m/min und der hohen Verdünnung der Papiermasse müssen insbesondere bei der Herstellung von Tissue-Papieren große Wassermengen innerhalb kurzer Entwässerungsstrecken und innerhalb kürzester Zeit durch das Gewebe abgeführt werden.Compared to a sheet forming sieve with the same number of transverse threads in the upper and lower layer, the floating length of the upper transverse threads is not shortened in the sheet forming sieve according to the invention by the multiple integration of the longitudinal threads. The double inclusion of the longitudinal threads in the upper layer makes the surface of the fabric more closed, but surprisingly the permeability does not decrease, but becomes even larger. This may be due to the fact that the paper side consists of a large number of transverse threads and each transverse thread of the upper layer is tied only once per repeat by a longitudinal thread. This means that the transverse thread floatations remain highly monoplanar compared to the longitudinal thread offset. The expression "super monoplan" is derived from the fact that with open weaving, the transverse threads (weft) initially lie straight in the fabric and the offsets of the longitudinal threads (warp) protrude on both sides of the fabric. When the fabric is thermofixed, a high tension is then exerted on the longitudinal threads, so that these try to take a straight course. In doing so, they deform the cross threads and take them off, which is referred to as an offset change. Sheet forming sieves are often heat set with such longitudinal tension that the uppermost points of the longitudinal threads and the transverse threads lie in one plane; the tissue is then monoplan. If the heat setting is continued beyond this point, the offset of the longitudinal threads becomes even smaller and that of the transverse threads always larger, ie the transverse threads protrude on the paper side and, depending on the construction of the fabric, also on the running side. The sheet forming screen is then monoplanet on the paper side, and the fibrous web is carried by the cross threads (cross thread or weft carrier). If the same effect also takes place on the running side, the cross threads absorb the abrasion (cross thread or weft runner). In the case of endlessly woven sheet-forming sieves, monoplanarity or over-monoplanarity cannot be achieved by heat-setting, since there the longitudinal threads are formed by the weft and therefore already lie in the tissue due to the weaving process. The pronounced transverse structure of the paper side of the covering according to the invention, in conjunction with the excess monoplanarity, provides good support for the paper web which is being formed and at the same time facilitates the removal of the paper web from the sheet-forming screen. This is particularly important for very thin tissue papers with low tensile strength. The high permeability of the fabric is of equal importance for the production of tissue papers. At paper machine working speeds of 1500 to 1800 m / min and the high thinning of the paper pulp, large amounts of water have to be drained through the fabric within short drainage distances and within a very short time, especially in the production of tissue papers.

Die erfindungsgemäße Bespannung eignet sich insbesondere zum Einsatz auf Doppelsieb-Pa piermaschinen. Es hat sich nämlich gezeigt, daß bei der erfindungsgemäßen Papiermaschinenbespannung das oben erwähnte Herausschleudern des Siebwassers an den ersten Umlenkstellen wesentlich verringert ist. Die Ursache hierfür ist nicht geklärt. Bei Bespannungen nach dem Stand der Technik, bei denen jeder Längsfaden pro Rapport nur einmal in die untere Lage eingebunden ist, wird die untere Hälfte des Gewebes fast ausschließlich aus freistehenden Querfadenabkröpfungen gebildet, da die Längsfäden nach dem einmaligen Einbinden wieder schräg nach oben zur Papierseite geführt werden.The covering according to the invention is particularly suitable for use on twin-wire paper machines. It has been shown that in the paper machine clothing according to the invention, the above-mentioned ejection of the white water at the first deflection points is significantly reduced. The reason for this is not clear. In the case of coverings according to the prior art, in which each longitudinal thread per repeat is integrated only once in the lower layer, the lower half of the fabric is formed almost exclusively from free-standing transverse thread offsets, since the longitudinal threads once again lead diagonally upwards to the paper side will.

Es wäre an sich zu erwarten, daß ein Gewebe mit sehr offener Struktur (DE-A-2 706 235, Fig. 2F) das Wasser nicht hält, sondern, daß das Wasser ungehindert durch das Gewebe strömt. Bei einem Gewebe mit stärkerer Verflechtung der Fäden auf der Laufseite - wie bei der erfindungsgemäßen Papiermaschinenbespannung - sollte an sich erwartet werden, daß das Wasser im Gewebe stärker zurückgehalten wird. Überraschenderweise ist dies jedoch nicht der Fall. Dies ist möglicherweise darauf zurückzuführen, daß die Längsfäden weitgehend auf der Laufseite gehalten werden, da sie zweimal die Querfäden der Laufseite einbinden. Dadurch werden die freien Räume zwischen den Querfäden auf der Laufseite verringert. Durch paarweise Führung der Längsfäden an den Abbindestellen wird die ansonsten sehr offene Laufseite teilweise abgedichtet, so daß hier das Mitschleppen von Wasser und das spätere Herausschleudern an den Umlenkstellen beträchtlich verringert wird. Dennoch bleibt das Gewebe auf der Laufseite ein Querfädenläufer. Die Flottungen der Querfäden zwischen den Einbindestellen der Längsfäden sind nämlich auf der Laufseite sehr lang, und an den Einbindestellen wirken jeweils zwei Längsfäden mit zusammengelegter Längsspannung auf die Querfäden und kröpfen diese ab.As such, it would be expected that a fabric with a very open structure (DE-A-2 706 235, Fig. 2F) does not hold the water, but that the water flows freely through the fabric. In the case of a fabric with greater interweaving of the threads on the running side - as in the case of the paper machine clothing according to the invention - it should be expected per se that the water in the fabric is retained more strongly. Surprisingly, however, this is not the case. This may be due to the fact that the longitudinal threads are largely held on the running side, since they bind the transverse threads on the running side twice. This reduces the free spaces between the cross threads on the running side. By guiding the longitudinal threads in pairs at the tying points, the otherwise very open barrel side is partially sealed, so that the entrainment of water and the subsequent ejection at the deflection points is considerably reduced. Nevertheless, the fabric on the running side remains a cross thread runner. The floats of the transverse threads between the binding points of the longitudinal threads are very long on the running side, and at the binding points two longitudinal threads with a combined longitudinal tension act on the transverse threads and bend them off.

Wegen seiner hohen Entwässerungsleistung eignet sich die erfindungsgemäße Papiermaschinenbespannung insbesondere zur Herstellung feiner Tissue-Papiere auf Doppelsiebpapiermaschinen.Because of its high drainage capacity, the paper machine clothing according to the invention is particularly suitable for the production of fine tissue papers on twin-wire paper machines.

Das erfindungsgemäße Blattbildungssieb ist gleichfalls für Schreib- und Druckpapiere geeignet, da es bei ausreichender Durchlässigkeit extrem hohe Querfadenzahlen in der oberen Lage ermöglicht, wodurch die Retention des Papierstoffes und die Markierung verbessert wird. Wegen der verbesserten Retention ist das erfindungsgemäße Blattbildungssieb auch für sog. "braune" Papiersorten einsetzbar, d.h., für Kraftpapiere, Verpackungspapiere auf Altpapierbasis und für Karton. Vorzugsweise ist die Bindung bezogen auf die Querfäden der unteren Lage ferner 7-, 8-, 14- oder 18-schäftig.The sheet forming sieve according to the invention is also suitable for writing and printing papers, since with sufficient permeability it enables extremely high transverse thread numbers in the upper layer, which improves the retention of the paper stock and the marking. Because of the improved retention, this is the invention Sheet forming screen can also be used for so-called "brown" paper types, ie for kraft papers, packaging papers based on waste paper and for cardboard. Preferably, the binding is also 7-, 8-, 14- or 18-strand based on the transverse threads of the lower layer.

Die Querfäden der unteren Lagen haben zweckmäßig einen größeren Durchmesser. Der Durchmesser dieser Querfäden wird dabei nur so groß gewählt, daß die Längsfäden noch eine ausreichende Kröpfung dieser Querfäden bewirken können und daß dadurch die Längsfäden dem Abrieb weitgehend entzogen sind. Diese Abkröpfung erfolgt erst bei der Fixierung der Bespannung, so daß die Fixierspannung entsprechend gewählt werden muß, um dem Blattbildungssieb die Eigenschaft eines Querfadenläufers zu verleihen.The transverse threads of the lower layers are expediently of a larger diameter. The diameter of these transverse threads is chosen only so large that the longitudinal threads can still provide sufficient cranking of these transverse threads and that the longitudinal threads are thereby largely removed from abrasion. This offset takes place only when the covering is fixed, so that the fixing tension must be chosen accordingly in order to give the sheet-forming sieve the property of a transverse thread runner.

Die erfindungsgemäße Bespannung wird zweckmäßig in offener Webweise hergestellt, so daß die Querfäden dann die Schußfäden sind und die Längsfäden die Kettfäden. Die Herstellung eines Querfadenläufers durch Rundweben stößt auf zusätzliche Schwierigkeiten, ist jedoch gleichfalls möglich, erfordert aber Webstühle mit sehr hoher Schaftzahl oder einem Fadenteiler gemäß DE-C-3 108 189.The covering according to the invention is expediently produced in an open weave, so that the transverse threads are then the weft threads and the longitudinal threads are the warp threads. The production of a cross thread runner by circular weaving encounters additional difficulties, but is also possible, but requires looms with a very high number of shafts or a thread divider according to DE-C-3 108 189.

Die Querfäden der oberen und der unteren Lage und die Längsfäden sind zweckmäßig Kunststoff-Monofile, insbesondere Polyester-Monofile. Die Querfäden der unteren Lage und gegebenenfalls auch der oberen Lage können jedoch z.T. auch aus Polyamid bestehen.The transverse threads of the upper and lower layers and the longitudinal threads are expediently plastic monofilaments, in particular polyester monofilaments. However, the transverse threads of the lower layer and possibly also of the upper layer can partly. also consist of polyamide.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung erläutert. Es zeigen:

  • Fig. 1 schematisch den Verlauf eines Längsfadens;
  • Fig. 2 in Draufsicht die Papierseit e der Bespannung;
  • Fig. 3 in Draufsicht die Laufseite und
  • Fig. 4 den Verlauf eines Längsfadens in einem anderen Ausführungsbeispiel.
Embodiments of the invention are explained below with reference to the drawing. Show it:
  • Fig. 1 shows schematically the course of a longitudinal thread;
  • 2 is a top view of the paper side e of the covering;
  • Fig. 3 in top view the running side and
  • Fig. 4 shows the course of a longitudinal thread in another embodiment.

Gemäß Fig. 1 weist das Ausführungsbeispiel eine obere Lage 1 von Querfäden 3 und eine untere Lage 2 von Querfäden 4 auf. Die Querfadenzahl ist in der oberen Lage 1 doppelt so hoch wie in der unteren Lage 2, so daß in der oberen Lage 1 jeweils ein Querfaden 3a über einem Querfaden 4 der unteren Lage 2 liegt und der nächste Querfaden 3b in der Mitte über zwei Querfäden 4 der unteren Lage 2 liegt.1, the embodiment has an upper layer 1 of transverse threads 3 and a lower layer 2 of transverse threads 4. The number of transverse threads in the upper layer 1 is twice as high as in the lower layer 2, so that in the upper layer 1 a cross thread 3a lies above a cross thread 4 of the lower layer 2 and the next cross thread 3b in the middle over two cross threads 4 the lower layer 2 is.

Längsfäden 5 verbinden die obere Lage 1 und die untere Lage 2. In Fig. 1 ist dabei der Verlauf eines Längsfadens 5 innerhalb eines Bindungsrapports dargestellt. Der Bindungsrapport erstreckt sich über sechzehn Querfäden 3 der oberen Lage bzw. acht Querfäden 4 der unteren Lage. Am linken Rand der Darstellung beginnend verläuft der Längsfaden 5 über einem Querfaden 3a der oberen Lage 1, dann unter zwei Querfäden 3b und 3a der oberen Lage 1, über einem Querfaden 3b der oberen Lage 1, bindet sodann mit dem fünften Querfaden 4 der unteren Lage 2 ab, verläuft zwischen beiden Lagen 1, 2, bindet mit dem achten Querfaden 4 der unteren Lage 2 ab und läuft schließlich schräg nach oben, um wieder mit dem ersten Querfaden 3a der oberen Lage 1 im nächstem Bindungsrapport abzubinden.Longitudinal threads 5 connect the upper layer 1 and the lower layer 2. In FIG. 1 the course of a longitudinal thread 5 is shown within a weave repeat. The weave repeat extends over sixteen transverse threads 3 of the upper layer or eight transverse threads 4 of the lower layer. Beginning at the left edge of the illustration, the longitudinal thread 5 runs over a transverse thread 3a of the upper layer 1, then under two transverse threads 3b and 3a of the upper layer 1, over a transverse thread 3b of the upper layer 1, then binds with the fifth transverse thread 4 of the lower layer 2, runs between the two layers 1, 2, binds with the eighth cross thread 4 of the lower layer 2 and finally runs diagonally upwards in order to bind again with the first cross thread 3a of the upper layer 1 in the next binding repeat.

Jeder Längsfaden 5 bindet also innerhalb eines Bindungsrapportes mit einem Querfaden 3a ab, der über einem Quer faden 4 der unteren Lage 2 liegt, und mit einem Querfaden 3b ab, der in der Mitte über zwei Querfäden 4 der unteren Lage liegt. Zwischen den beiden Querfäden 3a und 3b der oberen Lage, mit denen der Längsfaden 5 abbindet, müssen daher zwei, vier oder eine andere geradzahlige Anzahl von Querfäden liegen, damit die Bedingung erfüllt ist, daß jeder Längsfaden innerhalb eines Rapportes mit einem Querfaden 3a abbindet, der über einem Querfaden 4 der unteren Lage 2 liegt, und mit einem Querfaden 3b abbindet, der in der Mitte über zwei Querfäden 4 der unteren Lage 2 liegt.Each longitudinal thread 5 thus binds within a weave repeat with a transverse thread 3a, which is above a cross thread 4 of the lower layer 2, and with a transverse thread 3b, which lies in the middle over two transverse threads 4 of the lower layer. Between the two transverse threads 3a and 3b of the upper layer, with which the longitudinal thread 5 binds, there must therefore be two, four or another even number of transverse threads, so that the condition is met that each longitudinal thread binds with a transverse thread 3a within one repeat, which lies over a transverse thread 4 of the lower layer 2, and sets with a transverse thread 3b which lies in the middle over two transverse threads 4 of the lower layer 2.

Das Bindungsmuster der Papierseite ist in Fig. 2 dargestellt. Man erkennt, daß benachbarte Längsfäden 5 jeweils um sechs Querfäden gegeneinander in Längsrichtung versetzt sind und jeder Bindungsrapport acht Längsfäden 5 umfaßt.The binding pattern of the paper side is shown in Fig. 2. It can be seen that adjacent longitudinal threads 5 are each offset by six transverse threads in the longitudinal direction and each weave repeat comprises eight longitudinal threads 5.

Fig. 3 zeigt in einer Ansicht von unten die Laufseite des Ausführungsbeispieles von Fig. 1 und 2. An jeder Einbindestelle liegen zwei Längsfäden 5 zusammen und binden gemeinsam einen Querfaden 4 der unteren Lage 2 ein. Die Einbindung erfolgt dabei an einer Einbindestelle mit dem links danebenliegenden Längsfaden 5 und an der nächsten, in Fig. 3 weiter oben liegenden Einbindestelle mit dem rechts danebenliegenden Längsfaden.Fig. 3 shows a bottom view of the running side of the embodiment of Fig. 1 and 2. At each binding point, two longitudinal threads 5 are together and bind together a transverse thread 4 of the lower layer 2. The integration takes place at a binding point with the longitudinal thread 5 lying to the left and at the next binding point lying higher up in FIG. 3 with the longitudinal thread lying to the right.

Man erkennt in Fig. 2 und 3, daß sowohl auf der Papierseite als auch auf der Laufseite eine ausgeprägte Querstruktur vorliegt, die die Voraussetzung für einen Querfadenträger und Querfadenläufer ist.2 and 3 that a pronounced transverse structure is present both on the paper side and on the running side, which is the prerequisite for a cross thread carrier and cross thread runner.

Bei dem Ausführungsbeispiel der Figuren 1 bis 3 folgen die beiden Einbindungen des Längsfadens 5 in die obere Lage 1 unmittelbar aufeinander, d.h., ohne, daß dazwischen eine Einbindung des Längsfadens 5 in die untere Lage 2 erfolgt. Ebenso folgen die beiden Einbindungen des Längsfadens 5 in die untere Lage 2 unmittelbar aufeinander.In the exemplary embodiment in FIGS. 1 to 3, the two bindings of the longitudinal thread 5 in the upper layer 1 follow one another directly, that is, without the binding of the longitudinal thread 5 in the lower layer 2 in between he follows. Likewise, the two inclusions of the longitudinal thread 5 in the lower layer 2 follow one another directly.

In Fig. 4 ist ein Ausführungsbeispiel gezeigt, bei dem die Längsfaden 5 abwechselnd in die obere Lage 1 und in die untere Lage 2 eingebunden sind, so daß zwischen zwei Einbindungen in die obere Lage 1 eine Einbindung des Längsfadens 5 in die untere Lage 2 stattfindet. In Fig. 4 ist der Verlauf zweier benachbarter Längsfäden 5 gezeigt.In Fig. 4 an embodiment is shown in which the longitudinal thread 5 are alternately bound in the upper layer 1 and in the lower layer 2, so that between two ties in the upper layer 1, the longitudinal thread 5 is incorporated in the lower layer 2 . 4 shows the course of two adjacent longitudinal threads 5.

Beispiel:Example:

Das Gewebe hat die in den Figuren 1 bis 3 dargestellte 8-schäftige Bindung und ist offen gewebt. Die Längsfäden 5 bestehen aus Polyester-Monofil von 0,15 mm Durchmesser und sind in einer Dichte von 68 Fäden/cm angeordnet. Die Querfäden 3 der oberen Lage 1 bestehen aus Polyester-Monofil von 0,14 mm Durchmesser und sind in einer Dichte von 42 Fäd en/cm angeordnet. Die Querfäden 4 der unteren Lage 2 bestehen abwechselnd aus Polyester-Monofil und Polyamid-6.6-Monofil mit einem Durchmesser von 0,18 mm und sind in einer Dichte von 21 Fäden/cm angeordnet.The fabric has the 8-strand weave shown in FIGS. 1 to 3 and is woven open. The longitudinal threads 5 consist of polyester monofilament 0.15 mm in diameter and are arranged in a density of 68 threads / cm. The transverse threads 3 of the upper layer 1 consist of polyester monofilament of 0.14 mm diameter and are arranged in a density of 42 threads / cm. The transverse threads 4 of the lower layer 2 consist alternately of polyester monofilament and polyamide 6.6 monofilament with a diameter of 0.18 mm and are arranged in a density of 21 threads / cm.

Diese Werte gelten für das fertig fixierte Gewebe. Die Fixierung wird mit einer Temperatur von ca. 200°C und mit einer solchen Spannung durchgeführt, daß der Längsfaden 5 sowohl auf der Papierseite als auch auf der Laufseite in Richtung des Gewebeinneren verlagert wird, so daß er auf der Laufseite nicht dem Abrieb ausgesetzt ist und auf der Papierseite die Blattabnahme nicht stört. Beim Fixieren längt sich das Gewebe um ca. 8 %. Die Abkröpfungshöhe der Längsfäden 5 verringert sich, und die Längsfäden verlagern sich in das Gewebeinnere. Die Querfäden 3 und 4 werden durch die Spannung der Längsfäden 5 abgekröpft, wobei sich die Breite des Gewebes um ca. 11 % verkleinert. Infolge der Querkontraktion und des Druckes und Zuges der Längsfäden 5 wölben sich die Querfäden 3, 4 an den langen Flottungen nach außen und bilden die gewünschte übermonoplane Struktur auf der Papierseite und auf der Laufseite. These values apply to the fully fixed tissue. The fixation is carried out at a temperature of about 200 ° C and with such a tension that the longitudinal thread 5 is shifted both on the paper side and on the running side in the direction of the interior of the fabric, so that it is not exposed to abrasion on the running side and does not interfere with the sheet removal on the paper side. When fixing, the tissue lengthens by approx. 8%. The offset height of the longitudinal threads 5 decreases, and the longitudinal threads shift into the interior of the fabric. The transverse threads 3 and 4 are bent by the tension of the longitudinal threads 5, the width of the fabric being reduced by approximately 11%. As a result of the transverse contraction and the pressure and tension of the longitudinal threads 5, the transverse threads 3, 4 bulge outwards at the long floats and form the desired supermonoplane structure on the paper side and on the running side.

Claims (7)

1. Bespannung für den Blattbildungsteil einer Papiermaschine mit zwei Lagen (1,2) von Querfäden (3,4) und mit Längsfäden (5), die mit beiden Lagen (1,2) von Querfäden (3,4) verwoben sind, wobei sowohl auf der Papierseite als auch auf der Laufseite überwiegend die Querfäden (3,4) sichtbar sind und die Querfadenzahl der oberen Lage (1) doppelt so groß ist wie die Querfadenzahl in der unteren Lage (2), die Längsfäden (5) pro Rapport zweimal in die obere Lage (1) der Querfäden (3) eingebunden sind, die Einbindung einmal mit einem Querfaden (3a) erfolgt, der über einem Querfaden (4) der unteren Lage liegt, und das andere Mal mit einem Querfaden (3b) erfolgt, der in der Mitte über zwei Querfäden (4) der unteren Lage liegt, und der Längsfaden (5) zwischen beiden Einbindungen unter mindestens zwei Querfäden (3) der oberen Lage (1) verläuft, dadurch gekennzeichnet, daß die Längsfäden (5) pro Rapport zweimal in die untere Lage (2) der Querfäden (4) eingebunden sind und die Einbindung jeweils durch zwei benachbarte Längsfäden (5) erfolgt, wobei ein Längsfaden (5) an einer Einbindestelle zusammen mit dem vorausgehenden Längsfaden (5) und an der nächsten Einbindestelle zusammen mit dem nachfolgenden Längsfaden (5) einbindet und der Längsfaden (5) zwischen beiden Einbindestellen über mindestens einem Querfaden (4) der unteren Lage (2) verläuft.1. covering for the sheet forming part of a paper machine with two layers (1,2) of transverse threads (3,4) and with longitudinal threads (5), which are interwoven with both layers (1,2) of transverse threads (3,4), whereby The transverse threads (3, 4) are predominantly visible on both the paper side and the running side and the number of transverse threads in the upper layer (1) is twice as large as the number of transverse threads in the lower layer (2), the longitudinal threads (5) per repeat are integrated twice in the upper layer (1) of the transverse threads (3), the connection takes place once with a transverse thread (3a), which lies over a transverse thread (4) of the lower layer, and the other time with a transverse thread (3b) , which lies in the middle over two transverse threads (4) of the lower layer, and the longitudinal thread (5) runs between the two bindings under at least two transverse threads (3) of the upper layer (1), characterized in that the longitudinal threads (5) per Repeat two times in the lower layer (2) of the cross threads (4) and the binding each dur ch two adjacent longitudinal threads (5), one longitudinal thread (5) integrating at one binding point together with the preceding longitudinal thread (5) and at the next binding point together with the following longitudinal thread (5) and the longitudinal thread (5) between the two binding points at least one transverse thread (4) of the lower layer (2) runs. 2. Bespannung nach Anspruch 1, dadurch gekennzeichnet, daß die obere Lage (1) eine 7-, 8-, 14- oder 16-schäftige Bindung hat.2. Covering according to claim 1, characterized in that the upper layer (1) has a 7-, 8-, 14- or 16-strand binding. 3. Bespannung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Querfäden (3 bzw. 4) auf der Papierseite und der Laufseite gegenüber den Längsfäden (5) vorstehen, so daß der Abrieb vor allem von den Querfäden (4) der unteren Lage (2) aufgenommen wird und die Papierbahn vor allem von den Querfäden (3) der oberen Lage (1) getragen wird.3. covering according to claim 1 or 2, characterized in that the transverse threads (3 or 4) protrude on the paper side and the running side from the longitudinal threads (5), so that the abrasion is absorbed primarily by the transverse threads (4) of the lower layer (2) and the paper web especially by the transverse threads (3) of the upper layer (1 ) will be carried. 4. Bespannung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die beiden Einbindungen in die obere Lage 1 und in die untere Lage 2 jeweils unmittelbar aufeinanderfolgen, ohne daß der Längsfaden (5) zwischen den beiden Einbindungen in die jeweils andere Gewebelage eingebunden ist.4. Covering according to one of claims 1 to 3, characterized in that the two bindings in the upper layer 1 and in the lower layer 2 follow each other directly without the longitudinal thread (5) between the two bindings in the other fabric layer is. 5. Bespannung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß jeweils auf eine Einbindung des Längsfadens 5 in eine der beiden Lagen (1, 2) eine Einbindung in die jeweils andere Lage erfolgt.5. Covering according to one of claims 1 to 3, characterized in that in each case an integration of the longitudinal thread 5 in one of the two layers (1, 2) is carried out in the other layer. 6. Verwendung einer Bespannung nach einem der Ansprüche 1 bis 5 zur Herstellung von Tissue-Papier.6. Use of a covering according to one of claims 1 to 5 for the production of tissue paper. 7. Verwendung einer Bespannung nach einem der Ansprüche 1 bis 5 zur Herstellung von Papier auf einer Doppelsieb-Papiermaschine.7. Use of a covering according to one of claims 1 to 5 for the production of paper on a twin-wire paper machine.
EP87115267A 1986-10-20 1987-10-19 Fabric for the wet end of a paper-making machine Expired - Lifetime EP0264881B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87115267T ATE62948T1 (en) 1986-10-20 1987-10-19 CLOTHING FOR THE SHEET FORMING PART OF A PAPER MACHINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863635632 DE3635632A1 (en) 1986-10-20 1986-10-20 COVER FOR THE SHEET FORMING PART OF A PAPER MACHINE
DE3635632 1986-10-20

Publications (2)

Publication Number Publication Date
EP0264881A1 true EP0264881A1 (en) 1988-04-27
EP0264881B1 EP0264881B1 (en) 1991-04-24

Family

ID=6312061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87115267A Expired - Lifetime EP0264881B1 (en) 1986-10-20 1987-10-19 Fabric for the wet end of a paper-making machine

Country Status (9)

Country Link
US (1) US4776373A (en)
EP (1) EP0264881B1 (en)
JP (1) JP2573000B2 (en)
AT (1) ATE62948T1 (en)
BR (1) BR8705203A (en)
CA (1) CA1283589C (en)
DE (2) DE3635632A1 (en)
ES (1) ES2021675B3 (en)
FI (1) FI87812C (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342684A2 (en) * 1988-05-19 1989-11-23 NOVATECH GmbH Siebe und Technologie für Papier Double layer tissue for the forming section of a paper machine
WO1991014813A1 (en) * 1990-03-29 1991-10-03 Asten Group, Inc. Two-ply papermakers forming fabric
EP0549917A1 (en) * 1991-12-06 1993-07-07 Huyck Licensco, Inc. Absorbing felt
EP0654559A2 (en) * 1993-10-08 1995-05-24 Asten, Inc. Two-ply forming fabric with three or more times as many CMD yarns in the top ply than in the bottom ply
EP0697482A1 (en) * 1994-08-16 1996-02-21 Albany International Corp. Press fabrics for paper machines
EP0704572A1 (en) * 1991-12-18 1996-04-03 Albany International Corp. Press fabrics for paper machines
WO1999006631A1 (en) * 1997-07-31 1999-02-11 Asten, Inc. Double layer fabric having a high stability weave
US5894867A (en) * 1994-09-16 1999-04-20 Weavexx Corporation Process for producing paper using papermakers forming fabric
US5899240A (en) * 1994-09-16 1999-05-04 Weavexx Corporation Papermaker's fabric with additional first and second locator and fiber supporting yarns
US5937914A (en) * 1997-02-20 1999-08-17 Weavexx Corporation Papermaker's fabric with auxiliary yarns
US5983953A (en) * 1994-09-16 1999-11-16 Weavexx Corporation Paper forming progess
WO1999063153A1 (en) * 1998-06-02 1999-12-09 Weavexx Corporation Papermaker's double layer forming fabric
US6123116A (en) * 1999-10-21 2000-09-26 Weavexx Corporation Low caliper mechanically stable multi-layer papermaker's fabrics with paired machine side cross machine direction yarns
US6145550A (en) * 1997-08-01 2000-11-14 Weavexx Corporation Multilayer forming fabric with stitching yarn pairs integrated into papermaking surface
US6179013B1 (en) 1999-10-21 2001-01-30 Weavexx Corporation Low caliper multi-layer forming fabrics with machine side cross machine direction yarns having a flattened cross section
US6244306B1 (en) 2000-05-26 2001-06-12 Weavexx Corporation Papermaker's forming fabric
US6253796B1 (en) 2000-07-28 2001-07-03 Weavexx Corporation Papermaker's forming fabric
US6585006B1 (en) 2000-02-10 2003-07-01 Weavexx Corporation Papermaker's forming fabric with companion yarns
US6745797B2 (en) 2001-06-21 2004-06-08 Weavexx Corporation Papermaker's forming fabric
US6837277B2 (en) 2003-01-30 2005-01-04 Weavexx Corporation Papermaker's forming fabric
US6989079B2 (en) 2001-11-27 2006-01-24 Astenjohnson, Inc. High support double layer forming fabric
EP3372714A1 (en) * 2017-03-06 2018-09-12 A. Haberkorn & Co GmbH Structured circular woven fabric

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DE3713510A1 (en) * 1987-04-22 1988-11-10 Oberdorfer Fa F PAPER MACHINE SCREEN FROM A DOUBLE-LAYER FABRIC
DE3801051A1 (en) * 1988-01-15 1989-07-27 Wangner Gmbh Co Kg Hermann DOUBLE-DAY LOADING FOR THE SHEETING AREA OF A PAPER MACHINE
JP2558153B2 (en) * 1988-08-30 1996-11-27 日本フイルコン株式会社 Woven paper woven fabric with improved wire mark
US4909284A (en) * 1988-09-23 1990-03-20 Albany International Corp. Double layered papermaker's fabric
DE3910019A1 (en) * 1989-03-28 1990-10-04 Kufferath Andreas Gmbh MULTILAYER PAPER MACHINE SCREEN
US5067526A (en) * 1990-08-06 1991-11-26 Niagara Lockport Industries, Inc. 14 harness dual layer papermaking fabric
US5525410A (en) * 1995-02-24 1996-06-11 Albany International Corp. Press fabric
US5641001A (en) * 1995-08-16 1997-06-24 Huyck Licensco, Inc. Papermaker's fabric with additional cross machine direction yarns positioned in saddles
US6227256B1 (en) * 1999-12-13 2001-05-08 Albany International Corp. Multi-layer papermaking fabric having long weft floats on its support and machine surfaces
US6379506B1 (en) * 2000-10-05 2002-04-30 Weavexx Corporation Auto-joinable triple layer papermaker's forming fabric
JP3925915B2 (en) * 2002-05-24 2007-06-06 日本フイルコン株式会社 Industrial two-layer fabric
BRPI0515951A (en) * 2004-09-30 2008-08-12 Roger Danby high strength dual layer forming fabric of central plane
US20090183795A1 (en) 2008-01-23 2009-07-23 Kevin John Ward Multi-Layer Papermaker's Forming Fabric With Long Machine Side MD Floats
US7766053B2 (en) 2008-10-31 2010-08-03 Weavexx Corporation Multi-layer papermaker's forming fabric with alternating paired and single top CMD yarns
US8251103B2 (en) 2009-11-04 2012-08-28 Weavexx Corporation Papermaker's forming fabric with engineered drainage channels

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FR2287540A1 (en) * 1974-10-10 1976-05-07 Nordiska Maskinfilt Ag FABRIC SHAPED AND METHOD OF MANUFACTURING
US4161195A (en) * 1978-02-16 1979-07-17 Albany International Corp. Non-twill paperforming fabric
EP0010311A1 (en) * 1978-10-23 1980-04-30 JWI Ltd. Paper forming fabric
EP0080686A1 (en) * 1981-11-23 1983-06-08 Hermann Wangner GmbH & Co. KG Double layer fabric as a Fourdrinier wire for paper machines

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US4071050A (en) * 1972-09-01 1978-01-31 Nordiska Maskinfilt Aktiebolaget Double-layer forming fabric
SE397371C (en) * 1976-02-24 1980-08-18 Nordiska Maskinfilt Ab PREPARATION VIRUS FOR PAPER, CELLULOSA OR SIMILAR MACHINES
FR2346489A1 (en) * 1976-04-02 1977-10-28 Martel Catala Et Cie Sa Ets IMPROVEMENTS IN CANVAS FOR PAPER MACHINES AND THEIR MANUFACTURING PROCESSES
US4086941A (en) * 1976-10-26 1978-05-02 Huyck Corporation Biplanar papermaker's belt
SE430425C (en) * 1981-06-23 1986-09-19 Nordiskafilt Ab PREPARATION WIRES FOR PAPER, CELLULOSA OR SIMILAR MACHINES
DE3143433A1 (en) * 1981-11-02 1983-05-11 Hutter & Schrantz Siebtechnik GmbH, Wien Double-layered fabric for paper machine screens
SE441016B (en) * 1982-04-26 1985-09-02 Nordiskafilt Ab PREPARATION WIRES FOR PAPER, CELLULOSA OR SIMILAR MACHINES
US4709732A (en) * 1986-05-13 1987-12-01 Huyck Corporation Fourteen harness dual layer weave

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FR2287540A1 (en) * 1974-10-10 1976-05-07 Nordiska Maskinfilt Ag FABRIC SHAPED AND METHOD OF MANUFACTURING
US4161195A (en) * 1978-02-16 1979-07-17 Albany International Corp. Non-twill paperforming fabric
EP0010311A1 (en) * 1978-10-23 1980-04-30 JWI Ltd. Paper forming fabric
EP0080686A1 (en) * 1981-11-23 1983-06-08 Hermann Wangner GmbH & Co. KG Double layer fabric as a Fourdrinier wire for paper machines

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342684A2 (en) * 1988-05-19 1989-11-23 NOVATECH GmbH Siebe und Technologie für Papier Double layer tissue for the forming section of a paper machine
EP0342684A3 (en) * 1988-05-19 1991-08-07 NOVATECH GmbH Siebe und Technologie für Papier Double layer tissue for the forming section of a paper machine
WO1991014813A1 (en) * 1990-03-29 1991-10-03 Asten Group, Inc. Two-ply papermakers forming fabric
AU642012B2 (en) * 1990-03-29 1993-10-07 Astenjohnson, Inc. Two-ply papermakers forming fabric
EP0549917A1 (en) * 1991-12-06 1993-07-07 Huyck Licensco, Inc. Absorbing felt
EP0704572A1 (en) * 1991-12-18 1996-04-03 Albany International Corp. Press fabrics for paper machines
EP0654559A3 (en) * 1993-10-08 1995-09-06 Asten Group Two-ply forming fabric with three or more times as many CMD yarns in the top ply than in the bottom ply.
EP0654559A2 (en) * 1993-10-08 1995-05-24 Asten, Inc. Two-ply forming fabric with three or more times as many CMD yarns in the top ply than in the bottom ply
EP0697482A1 (en) * 1994-08-16 1996-02-21 Albany International Corp. Press fabrics for paper machines
US5894867A (en) * 1994-09-16 1999-04-20 Weavexx Corporation Process for producing paper using papermakers forming fabric
US5899240A (en) * 1994-09-16 1999-05-04 Weavexx Corporation Papermaker's fabric with additional first and second locator and fiber supporting yarns
US5983953A (en) * 1994-09-16 1999-11-16 Weavexx Corporation Paper forming progess
US6073661A (en) * 1994-09-16 2000-06-13 Weavexx Corporation Process for forming paper using a papermaker's forming fabric
US5937914A (en) * 1997-02-20 1999-08-17 Weavexx Corporation Papermaker's fabric with auxiliary yarns
WO1999006631A1 (en) * 1997-07-31 1999-02-11 Asten, Inc. Double layer fabric having a high stability weave
AU751899B2 (en) * 1997-07-31 2002-08-29 Astenjohnson, Inc. Double layer fabric having a high stability weave
US6145550A (en) * 1997-08-01 2000-11-14 Weavexx Corporation Multilayer forming fabric with stitching yarn pairs integrated into papermaking surface
WO1999063153A1 (en) * 1998-06-02 1999-12-09 Weavexx Corporation Papermaker's double layer forming fabric
US6112774A (en) * 1998-06-02 2000-09-05 Weavexx Corporation Double layer papermaker's forming fabric with reduced twinning.
US6123116A (en) * 1999-10-21 2000-09-26 Weavexx Corporation Low caliper mechanically stable multi-layer papermaker's fabrics with paired machine side cross machine direction yarns
US6179013B1 (en) 1999-10-21 2001-01-30 Weavexx Corporation Low caliper multi-layer forming fabrics with machine side cross machine direction yarns having a flattened cross section
US6585006B1 (en) 2000-02-10 2003-07-01 Weavexx Corporation Papermaker's forming fabric with companion yarns
US6244306B1 (en) 2000-05-26 2001-06-12 Weavexx Corporation Papermaker's forming fabric
US6253796B1 (en) 2000-07-28 2001-07-03 Weavexx Corporation Papermaker's forming fabric
US6745797B2 (en) 2001-06-21 2004-06-08 Weavexx Corporation Papermaker's forming fabric
US6989079B2 (en) 2001-11-27 2006-01-24 Astenjohnson, Inc. High support double layer forming fabric
US6837277B2 (en) 2003-01-30 2005-01-04 Weavexx Corporation Papermaker's forming fabric
EP3372714A1 (en) * 2017-03-06 2018-09-12 A. Haberkorn & Co GmbH Structured circular woven fabric

Also Published As

Publication number Publication date
FI874553A (en) 1988-04-21
BR8705203A (en) 1988-05-24
ES2021675B3 (en) 1991-11-16
FI87812B (en) 1992-11-13
FI874553A0 (en) 1987-10-15
DE3769579D1 (en) 1991-05-29
US4776373A (en) 1988-10-11
ATE62948T1 (en) 1991-05-15
CA1283589C (en) 1991-04-30
JPS63112787A (en) 1988-05-17
FI87812C (en) 1993-02-25
EP0264881B1 (en) 1991-04-24
DE3635632A1 (en) 1988-04-21
JP2573000B2 (en) 1997-01-16

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