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EP0279214B1 - Two-layer cloth for the wet end of a paper-making machine - Google Patents

Two-layer cloth for the wet end of a paper-making machine Download PDF

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Publication number
EP0279214B1
EP0279214B1 EP88100964A EP88100964A EP0279214B1 EP 0279214 B1 EP0279214 B1 EP 0279214B1 EP 88100964 A EP88100964 A EP 88100964A EP 88100964 A EP88100964 A EP 88100964A EP 0279214 B1 EP0279214 B1 EP 0279214B1
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EP
European Patent Office
Prior art keywords
binding
fabric
threads
paper making
composite paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88100964A
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German (de)
French (fr)
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EP0279214A2 (en
EP0279214A3 (en
Inventor
Fritz Vöhringer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
F Oberdorfer & Co KG Industriegewebe-Technik GmbH
Original Assignee
F Oberdorfer & Co KG Industriegewebe-Technik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by F Oberdorfer & Co KG Industriegewebe-Technik GmbH filed Critical F Oberdorfer & Co KG Industriegewebe-Technik GmbH
Priority to AT88100964T priority Critical patent/ATE62289T1/en
Publication of EP0279214A2 publication Critical patent/EP0279214A2/en
Publication of EP0279214A3 publication Critical patent/EP0279214A3/en
Application granted granted Critical
Publication of EP0279214B1 publication Critical patent/EP0279214B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21F1/0045—Triple layer fabrics

Definitions

  • the invention relates to a composite fabric as a paper machine screen consisting of at least two complete fabrics, which are woven together with longitudinal or transverse binding threads.
  • the top fabric or forming fabric is made in a very fine design for use as a paper machine screen.
  • the fineness and flatness of this forming fabric determines the quality of the paper.
  • the bottom fabric or wear fabric determines the stability and the service life of the composite screen and is therefore made of thick threads and roughly structured.
  • the paper machine screen runs through the roller system of the wet end at high speed, dewatered the paper stock and transported it to the press end. During this process, the screen tension increases very much, the screen expands and becomes narrower at the same time. Immediately after passing the drive roller, the fabric tension drops abruptly and the sieve widens again. Due to the different fineness and the mostly not the same type of weave of the upper and lower tissue, the mechanical behavior and thus the contraction is also different. This is the cause of transverse displacement stresses between the upper and lower tissues, which must be absorbed by the binding threads.
  • DE-OS 2 917 694 proposes to connect the fabrics with transverse binding threads.
  • the different cross contractions of the upper and lower tissues can thus be mastered.
  • the composite screen On its way through the roller system of the wet end, the composite screen alternately passes outside and inside rollers.
  • the associated constant load changes cause a relative movement in the running direction between the upper and lower fabric, which means that the binding threads are very quickly destroyed by friction.
  • This very disadvantageous effect cannot be avoided by transverse binding threads in known fabrics of this type, at best by a longitudinal binding thread system, which is, however, not particularly suitable for absorbing transverse displacement tensions.
  • the object of the present invention is to eliminate the disadvantages described and to create a composite fabric which is suitable for accommodating transverse and longitudinal dishes ten displacement voltages are particularly suitable by almost eliminating the elongation of the longitudinal binding thread parts by the shrinkage of the transverse binding thread parts, so that a disturbance of the paper-side surface by formation of binding point depressions is avoided and a substantial reduction, if not complete avoidance, of relative movements between top and Lower fabric of the composite fabric is reached.
  • the zigzag-shaped course of the binding threads according to the invention which extend only in one direction, can reduce both longitudinal and transverse relative movements between the fabrics to a tolerable level.
  • Anchoring points directed sideways along the direction of the twine are thus formed. It goes without saying that the number of left and right anchoring points must be approximately the same due to the balance. This creates a secure connection between the upper and lower fabric that resembles tent tension. Just as this prevents the tent poles from tipping over, the binding thread guide according to the invention minimizes the disruptive relative movement between the upper and lower fabrics.
  • the binding threads can extend in the running direction or transverse to the running direction of the paper machine.
  • Sieves in which the weaving direction and running direction match are called flat-woven sieves.
  • Sieves woven in this way must be strongly stretched to achieve sufficient longitudinal stability under the influence of heat.
  • the lengthways oriented twine also stretched.
  • the associated increase in tension in the binding threads, together with the effect of heat, causes permanent depressions in the sensitive top wire, which become apparent as markings in the paper. For this reason, all composite fabrics previously used on paper machines are equipped with transverse binding threads.
  • flat-woven composite sieves with longitudinal binding threads can now also be produced.
  • stretching mentioned not only is there a permanent elongation, but also a permanent transverse shrinkage of the same order of magnitude. Since the binding threads in the composite sieve according to the invention not only have longitudinal, but also transverse components of similar size, the increase in tension in the longitudinal binding threads during the stretching process is avoided. The elongation of the longitudinal twine parts is almost canceled by the shrinkage of the transverse twine parts.
  • the representations of the upper and lower fabrics are binding cartridges in a form that shows the structure of the outer sides of the fabric.
  • Crosslines such as 11, 12, 13 are chain cuts, longitudinal lines such as 16, 18, 18 ', 22, 23 consequently chain elevations.
  • Cross lines like 12, 14 are chain lifts
  • longitudinal lines like 17, 20, 21, 24, 25 are chain drops.
  • the markings a, b, c and a, b, c, d each define the position of the upper and lower tissues relative to one another.
  • the composite sieve of known type shown in FIG. 1 consists of a fine upper fabric 5 in a single weave and a coarse lower fabric 6 in a crossed Batavia weave.
  • the binding points 11 in the upper fabric and 12 in the lower fabric 6 lie on a straight line in the projection onto a plane parallel to the screen surface. As experience has shown, this connection principle cannot avoid movements between the individual fabrics transverse to the direction of extension of the binding threads.
  • FIG. 2 which shows a composite sieve according to the invention with a lower weave 7 in a single weave
  • the binding points 14 of the lower fabric 7 are alternately offset to the left and right, as seen in the direction of extension of the binding threads.
  • the binding points 13 lie approximately in the middle between the binding points 14 arranged to the left and right thereof.
  • the projection of the binding thread shown in FIG. 2 onto a plane parallel to the screen surface corresponds to the zigzag line shown in FIG. 3, namely in binding threads -Direction seen, which is indicated in Fig. 2 by the arrow A.
  • a bottom fabric 8 in cross-twill weave can also be selected.
  • the longitudinally arranged binding points 16 in the upper fabric 1 lie on a line between the markings a and b and c and d.
  • the associated binding points 17 in the lower fabric again form anchoring points placed alternately to the left and right of this line.
  • the projection of the binding thread corresponds to the illustration in FIG. 3.
  • FIG. 7 A particularly favorable embodiment of the invention is shown in FIG. 7 with a lower fabric 9 in a three-body weave.
  • two longitudinal binding threads each bind along a longitudinal thread of the upper fabric 2 in this fabric.
  • the binding points 18, 19 of the pair of binding threads again lie on a line, while the associated binding points 20, 21 are arranged alternately to the right and left of this line in the lower fabric.
  • the binding thread between the binding points 18 'and 18 ⁇ runs straight and not there in the lower fabric 9th integrates because there is no suitable binding point at this point of the lower tissue.
  • a composite screen which consists of two differently fine three-body fabrics.
  • the outside of the upper fabric 10 has a longitudinal floatation.
  • the outside of the lower fabric 3 is floating.
  • This composite screen is thus like the screens shown in FIGS. 6 and 7 a weft runner.
  • the binding points 24 of the lower fabric belonging to the binding points 22 are all arranged on the right side of the binding points 22, while the binding points 25 belonging to the binding points 23 of the next binding thread are all located on the left side in the lower fabric 3.
  • the projection of these two successive binding threads thus corresponds to the illustration in FIG. 4.
  • the binding threads are not stretched and the dreaded depressions are absent.
  • 6 and 7 are examples of this procedure. If necessary, the distance a can be chosen even shorter than in these two examples.
  • the bond point distance a need not be made shorter because the Tie points of the upper fabric 10 all lie on inward transverse cranks and thus do not significantly affect the surface. It is sufficient here to use high-stretch binding threads made of polyester or polyamide. Depending on the high elongation, such threads have low heat shrinkage corresponding to low shrinkage stresses.

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  • Paper (AREA)
  • Woven Fabrics (AREA)
  • Decoration Of Textiles (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

Upper and lower layers of fabric are woven together with longitudinally or laterally directed binding threads. The latter permit the different lateral shrinkages of these layers of fabric to be overcome but not, however, the oscillating relative movement between the upper and lower layers brought about by the constant alterations in load during passage through the roll system of the wet- end in the machine direction which destroys the binding threads by friction. <??>The consolidated web is, therefore, to be so constructed that it is especially suited to the absorption of longitudinally and laterally directed displacement tensions by arranging that the lengthening of the longitudinally directed binding-thread sections is almost fully compensated by the shrinkage of the laterally directed binding thread sections, so that a considerable reduction in relative movement between the upper and lower layers is achieved. <??>In this context, it is proposed that at least some of the binding points of at least some of the binding threads in the upper layer of fabric are so arranged with respect to each following binding point in the longitudinal direction of the binding threads in the lower layer of fabric that the binding points following one another in the longitudinal direction of the binding thread alternating between the upper and lower layers of fabric are displaced laterally with respect to the perpendicular to the wire surface such that the projection of at least part of the binding threads onto a plane parallel to the wire surface is a zig-zag line at least in partial lengths. <IMAGE>

Description

Die Erfindung betrifft ein Verbundgewebe als Papiermaschinensieb bestehend aus mindestens zwei kompletten Geweben, die mit längsgerichteten oder quergerichteten Bindefäden zusammengewebt sind.The invention relates to a composite fabric as a paper machine screen consisting of at least two complete fabrics, which are woven together with longitudinal or transverse binding threads.

Für den Einsatz als Papiermaschinensieb wird das Obergewebe bzw. Formiergewebe in sehr feiner Ausführung gefertigt. Die Feinheit und Ebenheit dieses Formiergewebes bestimmt die Qualität des Papiers. Das Untergewebe bzw. Verschleißgewebe bestimmt die Stabilität und die Lebensdauer des Verbundsiebes und ist deshalb aus dicken Fäden hergestellt und grob strukturiert. Das Papiermaschinensieb durchläuft mit hoher Geschwindigkeit das Walzen-System der Naßpartie, entwässert den Papierstoff und transportiert ihn zur Pressenpartie. Während dieses Vorganges nimmt die Siebspannung sehr stark zu, das Sieb dehnt sich und wird gleichzeitig schmaler. Unmittelbar nach Passieren der Antriebswalze fällt die Siebspannung schlagartig ab und das Sieb wird wieder breiter. Wegen der unterschiedlichen Feinheit und der meist nicht gleichen Bindungsart von Ober- und Untergewebe ist das mechanische Verhalten und somit die Kontraktion ebenfalls unterschiedlich. Dies ist die Ursache für quergerichtete Verschiebespannungen zwischen Ober- und Untergewebe, die von den Bindefäden aufgenommen werden müssen.The top fabric or forming fabric is made in a very fine design for use as a paper machine screen. The fineness and flatness of this forming fabric determines the quality of the paper. The bottom fabric or wear fabric determines the stability and the service life of the composite screen and is therefore made of thick threads and roughly structured. The paper machine screen runs through the roller system of the wet end at high speed, dewatered the paper stock and transported it to the press end. During this process, the screen tension increases very much, the screen expands and becomes narrower at the same time. Immediately after passing the drive roller, the fabric tension drops abruptly and the sieve widens again. Due to the different fineness and the mostly not the same type of weave of the upper and lower tissue, the mechanical behavior and thus the contraction is also different. This is the cause of transverse displacement stresses between the upper and lower tissues, which must be absorbed by the binding threads.

Die DE-OS 2 917 694 schlägt vor, die Gewebe mit quergerichteten Bindefäden zu verbinden. Damit können die unterschiedlichen Querkontraktionen von Ober- und Untergewebe beherrscht werden. Bei seinem Weg durch das Walzensystem der Naßpartie passiert das Verbundsieb im Wechsel außen- und innenliegende Walzen. Die damit verbundenen ständigen Lastwechsel verursachen eine in Laufrichtung schwingende Relativbewegung zwischen Ober- und Untergewebe, wodurch die Bindefäden sehr schnell durch Reibung zerstört werden. Dieser sehr nachteilige Effekt kann durch quergerichtete Bindefäden bei bekannten Geweben dieser Art nicht vermieden werden, allenfalls durch ein längsgerichtetes Bindefadensystem, das aber für die Aufnahme von quergerichteten Verschiebespannungen nicht besonders geeignet ist.DE-OS 2 917 694 proposes to connect the fabrics with transverse binding threads. The different cross contractions of the upper and lower tissues can thus be mastered. On its way through the roller system of the wet end, the composite screen alternately passes outside and inside rollers. The associated constant load changes cause a relative movement in the running direction between the upper and lower fabric, which means that the binding threads are very quickly destroyed by friction. This very disadvantageous effect cannot be avoided by transverse binding threads in known fabrics of this type, at best by a longitudinal binding thread system, which is, however, not particularly suitable for absorbing transverse displacement tensions.

Es wurde deshalb in DE 33 05 713 vorgeschlagen, für die Verbindung von zwei Geweben längs- und quergerichtete Bindefäden zu verwenden. Bei einem solchen komplizierten und unübersichtlichen Aufbau ist jedoch die Forderung nach einer möglichst ebenen Oberfläche des Obersiebes, die frei von Bindepunkt-Vertiefungen ist, nicht mehr erfüllbar. Eine einwandfreie Qualität der Webnaht ist mit einem vertretbaren Aufwand nicht mehr zu erreichen. Beides sind aber wesentliche Voraussetzungen für die Brauchbarkeit des Verbundsiebes.It was therefore proposed in DE 33 05 713 to use longitudinal and transverse binding threads for the connection of two fabrics. With such a complicated and confusing structure, however, the requirement for a surface of the top wire which is as flat as possible and which is free of binding point depressions can no longer be met. A flawless quality of the woven seam can no longer be achieved with reasonable effort. However, both are essential prerequisites for the usability of the composite screen.

Die vorliegende Erfindung macht es sich zur Aufgabe, die geschilderten Nachteile zu beseitigen und ein Verbundgewebe zu schaffen, das sich zur Aufnahme von quer- und längsgerichte ten Verschiebespannungen besonders eignet, indem die Längung der längsgerichteten Bindefadenteile durch den Schrumpf der quergerichteten Bindefadenteile nahezu aufgehoben wird, so daß eine Störung der papierseitigen Oberfläche durch Bildung von Bindepunkt-Vertiefungen vermieden und eine wesentliche Verminderung, wenn nicht vollständige Vermeidung von Relativbewegungen zwischen Ober- und Untergewebe des Verbundgewebes erreicht wird.The object of the present invention is to eliminate the disadvantages described and to create a composite fabric which is suitable for accommodating transverse and longitudinal dishes ten displacement voltages are particularly suitable by almost eliminating the elongation of the longitudinal binding thread parts by the shrinkage of the transverse binding thread parts, so that a disturbance of the paper-side surface by formation of binding point depressions is avoided and a substantial reduction, if not complete avoidance, of relative movements between top and Lower fabric of the composite fabric is reached.

Die Lösung dieser Aufgabe ist im Anspruch 1 gekennzeichnet.The solution to this problem is characterized in claim 1.

Sie besteht in dem Gedanken, die Bindefäden so einzuweben, daß die oberen Bindepunkte von den unteren in Richtung der Relativbewegung beabstandet sind, wodurch in dieser Richtung eine Spannungskomponente erzeugt wird, welche die Relativbewegung unterbindet.It consists in the idea of weaving in the binding threads in such a way that the upper binding points are spaced apart from the lower ones in the direction of the relative movement, as a result of which a tension component is generated in this direction, which prevents the relative movement.

Der erfindungsgemäße zick-zack-förmige Verlauf der Bindefäden, die sich nur in einer Richtung erstrecken, kann sowohl längs- als auch quergerichtete Relativbewegungen zwischen den Geweben auf ein erträgliches Maß reduzieren. Es werden also entlang der Bindefaden-Richtung seitwärts gerichtete Verankerungspunkte gebildet. Es versteht sich von selbst, daß die Anzahl der links und rechts orientierten Verankerungspunkte wegen des Gleichgewichts in etwa gleich sein muß. So entsteht eine sichere Verbindung zwischen Ober- und Untergewebe, die einer Zeltverspannung gleicht. So wie diese das Kippen der Zeltstangen verhindert, minimiert die erfindungsgemäße Bindefadenführung die störende Relativbewegung zwischen Ober-und Untergewebe.The zigzag-shaped course of the binding threads according to the invention, which extend only in one direction, can reduce both longitudinal and transverse relative movements between the fabrics to a tolerable level. Anchoring points directed sideways along the direction of the twine are thus formed. It goes without saying that the number of left and right anchoring points must be approximately the same due to the balance. This creates a secure connection between the upper and lower fabric that resembles tent tension. Just as this prevents the tent poles from tipping over, the binding thread guide according to the invention minimizes the disruptive relative movement between the upper and lower fabrics.

Die Bindefäden können sich in Laufrichtung oder quer zur Laufrichtung der Papiermaschine erstrecken. Siebe, bei denen Webrichtung und Laufrichtung übereinstimmen, nennt man flachgewobene Siebe. So gewobene Siebe müssen zur Erzielung einer ausreichenden Längsstabilität unter Wärmeeinwirkung stark gereckt werden. Dabei werden die längs gerichteten Bindefäden ebenfalls verstreckt. Der damit verbundene Spannungsanstieg in den Bindefäden verursacht zusammen mit der Wäremeeinwirkung bleibende Vertiefungen im empfindlichen Obersieb, die sich als Markierungen im Papier abzeichnen. Aus diesem Grund sind alle bisher auf Papiermaschinen eingesetzte Verbundgewebe mit quergerichteten Bindefäden ausgestattet.The binding threads can extend in the running direction or transverse to the running direction of the paper machine. Sieves in which the weaving direction and running direction match are called flat-woven sieves. Sieves woven in this way must be strongly stretched to achieve sufficient longitudinal stability under the influence of heat. The lengthways oriented twine also stretched. The associated increase in tension in the binding threads, together with the effect of heat, causes permanent depressions in the sensitive top wire, which become apparent as markings in the paper. For this reason, all composite fabrics previously used on paper machines are equipped with transverse binding threads.

Nach der vorliegenden Erfindung können nun auch flachgewobene Verbundsiebe mit längsgerichteten Bindefäden hergestellt werden. Bei der erwähnten Reckung entsteht nämlich nicht nur eine bleibende Längung, sondern auch ein bleibender Querschrumpf von gleicher Größenordnung. Da bei dem erfindungsgemäßen Verbundsieb die Bindefäden nicht nur längsgerichtete, sondern auch quergerichtete Anteile von ähnlicher Größe haben, wird der Spannungsanstieg in den längsgerichteten Bindefäden während des Reckvorganges vermieden. Die Längung der längsgerichteten Bindefadenteile wird durch den Schrumpf der quergerichteten Bindefadenteile nahezu aufgehoben.According to the present invention, flat-woven composite sieves with longitudinal binding threads can now also be produced. With the stretching mentioned, not only is there a permanent elongation, but also a permanent transverse shrinkage of the same order of magnitude. Since the binding threads in the composite sieve according to the invention not only have longitudinal, but also transverse components of similar size, the increase in tension in the longitudinal binding threads during the stretching process is avoided. The elongation of the longitudinal twine parts is almost canceled by the shrinkage of the transverse twine parts.

Im folgenden wird die Erfindung anhand von in der Zeichnung schematisch dargestellten Ausführungsbeispielen näher erläutert.The invention is explained in more detail below on the basis of exemplary embodiments shown schematically in the drawing.

In der Zeichnung zeigen:

  • Fig. 1 eine Draufsicht der Oberseite (links) und der Unterseite eines bekannten Verbundsiebes mit quergerichteten Bindefäden;
  • Fig. 2 eine Draufsicht der Oberseite (oben) und der Unterseite eines erfindungsgemäßen Verbundsiebes mit quergerichteten Bindefäden;
  • Fig. 3 die Projektion eines erfindungsgemäßen Bindefadens auf eine zur Siebfläche parallele Ebene, wobei die Bindepunkte im Obergewebe durch Punkte markiert sind und im Untergewebe auf den nach links und rechts gerichteten Ecken der Zick-Zack-Linie liegen;
  • Fig. 4 die Projektion von zwei aufeinanderfolgenden Bindefäden entsprechend der Erfindung, wobei die Bindepunkte im Obergewebe auf den nach außen gerichteten und im Untergewebe auf den nach innen gerichteten Ecken liegen;
  • Fig. 5 eine perspektivische Ansicht, die den räumlichen Verlauf eines erfindungsgemäßen Bindefadens zwischen drei aufeinanderfolgenden Bindepunkt zeigt,wobei die Fläche 15 zur Blattbildungs- oder Siebebene parallel verläuft, und
  • Fig. 6, 7 und 8 Draufsichten ähnlich der Fig. 1 und 2 der Ober- und Unterseiten von Verbundsieben entsprechend der Erfindung mit längsgerichteten Bindefäden und unterschiedlichen Bindungsarten im Ober- und Untergewebe.
The drawing shows:
  • Figure 1 is a plan view of the top (left) and the bottom of a known composite screen with transverse binding threads.
  • Figure 2 is a plan view of the top (top) and the bottom of a composite screen according to the invention with transverse binding threads.
  • Fig. 3 shows the projection of a binding thread according to the invention on a plane parallel to the screen surface, the binding points in the upper fabric by points are marked and lie in the lower fabric on the left and right corners of the zigzag line;
  • 4 shows the projection of two successive binding threads according to the invention, the binding points in the upper fabric lying on the outward-facing corners and in the lower fabric on the inward-facing corners;
  • 5 is a perspective view showing the spatial course of a binding thread according to the invention between three successive binding points, the surface 15 running parallel to the sheet formation or screening plane, and
  • 6, 7 and 8 plan views similar to FIGS. 1 and 2 of the top and bottom sides of composite screens according to the invention with longitudinal binding threads and different types of binding in the upper and lower fabrics.

Die Darstellungen der Ober- und Untergewebe sind Bindungspatronen in einer Form, die die Struktur der Außenseiten des Gewebes sichtbar macht. Für die Darstellung der Obergewebe gilt:The representations of the upper and lower fabrics are binding cartridges in a form that shows the structure of the outer sides of the fabric. The following applies to the representation of the upper fabrics:

Querstriche wie 11, 12, 13 sind Kettsenkungen, Längsstriche wie 16, 18, 18′, 22, 23 demzufolge Ketthebungen. Für die Darstellung der Untergewebe gilt:Crosslines such as 11, 12, 13 are chain cuts, longitudinal lines such as 16, 18, 18 ', 22, 23 consequently chain elevations. The following applies to the representation of the lower fabric:

Querstriche wie 12, 14 sind Ketthebungen, Längsstriche wie 17, 20, 21, 24, 25 also Kettsenkungen.Cross lines like 12, 14 are chain lifts, longitudinal lines like 17, 20, 21, 24, 25 are chain drops.

Diese Bedeutungen gelten natürlich nicht nur für die als dünne Striche gezeichneten Bindepunkte der Bindefäden, sondern auch für die als dickere Striche gezeichneten Kröpfungen und Flottierungen der Kett- und Schußfäden der Ober- und Untergewebe.Of course, these meanings apply not only to the binding points of the binding threads drawn as thin lines, but also to the offsets and floats of the warp and weft threads of the upper and lower fabrics drawn as thick lines.

Die Markierungen a, b, c bzw. a, b, c, d definieren jeweils die Lage von Ober- und Untergewebe zueinander.The markings a, b, c and a, b, c, d each define the position of the upper and lower tissues relative to one another.

Das in Fig.1 dargestellte Verbundsieb bekannter Art besteht aus einem feinen Obergewebe 5 in einfacher Bindung und einem groben Untergewebe 6 in gekreuzter Batavia-Bindung. Die Bindepunkte 11 im Obergewebe und 12 im Untergewebe 6 liegen in der Projektion auf eine zur Siebfläche parallelen Ebene auf einer Geraden.Mit diesem Verbindungsprinzip lassen sich,wie die Erfahrung lehrt, quer zur Erstreckungsrichtung der Bindefäden auftretende Bewegungen zwischen den Einzelgeweben nicht vermeiden.The composite sieve of known type shown in FIG. 1 consists of a fine upper fabric 5 in a single weave and a coarse lower fabric 6 in a crossed Batavia weave. The binding points 11 in the upper fabric and 12 in the lower fabric 6 lie on a straight line in the projection onto a plane parallel to the screen surface. As experience has shown, this connection principle cannot avoid movements between the individual fabrics transverse to the direction of extension of the binding threads.

In Fig. 2, die ein erfindungsgemäßes Verbundsieb mit einem Untergewebe 7 in einfacher Bindung zeigt, liegen nur die Bindepunkte 13 des Obergewebes 4 auf einer Geraden. Die Bindepunkte 14 des Untergewebes 7 sind dagegen in Erstreckungsrichtung der Bindefäden gesehen abwechselnd nach links und rechts versetzt. Die Bindepunkte 13 liegen ungefähr in der Mitte zwischen den links und rechts davon angeordneten Bindepunkten 14. Die Projektion des in Fig. 2 dargestellten Bindefadens auf eine zur Siebfläche parallelen Ebene entspricht der in Fig. 3 gezeigten Zick-Zack-Linie, und zwar in Bindefaden-Richtung gesehen, die in Fig. 2 durch den Pfeil A angegeben wird.In FIG. 2, which shows a composite sieve according to the invention with a lower weave 7 in a single weave, only the weaving points 13 of the upper weave 4 lie on a straight line. The binding points 14 of the lower fabric 7, however, are alternately offset to the left and right, as seen in the direction of extension of the binding threads. The binding points 13 lie approximately in the middle between the binding points 14 arranged to the left and right thereof. The projection of the binding thread shown in FIG. 2 onto a plane parallel to the screen surface corresponds to the zigzag line shown in FIG. 3, namely in binding threads -Direction seen, which is indicated in Fig. 2 by the arrow A.

Natürlich kann auch, wie in Fig. 6 dargestellt, ein Untergewebe 8 in Kreuzköper-Bindung gewählt werden. Die in Längsrichtung angeordneten Bindepunkte 16 im Obergewebe 1 liegen auf einer Linie zwischen den Markierungen a und b sowie c und d. Die dazugehörigen Bindepunkte 17 im Untergewebe bilden wieder abwechselnd links und rechts von dieser Linie plazierte Verankerungspunkte. Die Projektion des Bindefadens entspricht der Darstellung in Fig. 3.Of course, as shown in FIG. 6, a bottom fabric 8 in cross-twill weave can also be selected. The longitudinally arranged binding points 16 in the upper fabric 1 lie on a line between the markings a and b and c and d. The associated binding points 17 in the lower fabric again form anchoring points placed alternately to the left and right of this line. The projection of the binding thread corresponds to the illustration in FIG. 3.

Eine besonders günstige Ausführung der Erfindung zeigt die Fig. 7 mit einem Untergewebe 9 in Dreiköper-Bindung. Hierbei binden jeweils zwei längsgerichtete Bindefäden entlang eines Längsfadens des Obergewebes 2 in dieses Gewebe ein. Die Bindepunkte 18, 19 des Bindefadenpaares liegen wiederum auf einer Linie, während die dazugehörigen Bindepunkte 20, 21 im Untergewebe abwechselnd rechts und links von dieser Linie angeordnet sind. Zu beachten ist, daß der Bindefaden zwischen den Bindepunkten 18′ und 18˝ geradlinig verläuft und dort nicht im Untergewebe 9 einbindet, weil an dieser Stelle des Untergewebes kein geeigneter Bindepunktplatz vorhanden ist.A particularly favorable embodiment of the invention is shown in FIG. 7 with a lower fabric 9 in a three-body weave. Here, two longitudinal binding threads each bind along a longitudinal thread of the upper fabric 2 in this fabric. The binding points 18, 19 of the pair of binding threads again lie on a line, while the associated binding points 20, 21 are arranged alternately to the right and left of this line in the lower fabric. It should be noted that the binding thread between the binding points 18 'and 18˝ runs straight and not there in the lower fabric 9th integrates because there is no suitable binding point at this point of the lower tissue.

In Fig. 8 ist ein Verbundsieb dargestellt, das aus zwei unterschiedlich feinen Dreiköpergeweben besteht. Die Außenseite des Obergewebes 10 hat eine Längsflottierung. Die Außenseite des Untergewebes 3 ist querflottierend. Dieses Verbundsieb ist also wie die in Fig. 6 und Fig. 7 dargestellten Siebe ein Schußläufer. Die zu den Bindepunkten 22 gehörigen Bindepunkte 24 des Untergewebes sind alle rechtsseitig von den Bindepunkten 22 angeordnet, während die zu den Bindepunkten 23 des nächsten Bindefadens gehörigen Bindepunkte 25 im Untergewebe 3 alle linksseitig liegen. Die Projektion dieser beiden aufeinanderfolgenden Bindefäden entspricht somit der Darstellung in Fig. 4.In Fig. 8, a composite screen is shown, which consists of two differently fine three-body fabrics. The outside of the upper fabric 10 has a longitudinal floatation. The outside of the lower fabric 3 is floating. This composite screen is thus like the screens shown in FIGS. 6 and 7 a weft runner. The binding points 24 of the lower fabric belonging to the binding points 22 are all arranged on the right side of the binding points 22, while the binding points 25 belonging to the binding points 23 of the next binding thread are all located on the left side in the lower fabric 3. The projection of these two successive binding threads thus corresponds to the illustration in FIG. 4.

Wie schon erwähnt, müssen flachgewebte Siebe zur Erzielung einer ausreichenden Längsstabilität unter Zuführung von Wärme stark gereckt werden. Dabei werden längsgerichtete Bindefäden verstreckt. Der damit verbundene Spannungsanstieg in den Bindefäden verursacht störende Vertiefungen im empfindlichen Obergewebe. Diese Vertiefungen zeichnen sich als unerwünschte Markierungen im Papier ab. An Fig. 5 läßt sich die folgende Beziehung ablesen, wobei mit 15 eine Fläche bezeichnet ist, die parallel zur Siebebene verläuft:

Figure imgb0001
Es bedeuten:

  • 1 ≅ Die Teillänge des Bindefadens, d.h. die Bindefadenlänge zwischen einem Bindepunkt im Obergewebe und dem in Längsrichtung des Bindefadens folgenden Bindepunkt im Untergewebe;
  • d ≅ die Gewebedicke, gemessen von der Oberseite des Obergewebes bis zur Unterseite des Untergewebes;
  • s ≅ der Abstand, um den zwei Bindepunkte, die in Längsrichtung des Bindefadens aufeinander folgen, in bezug auf das Obergewebe im Untergewebe seitlich versetzt sind;
  • a ≅ der Abstand in Bindefadenlängsrichtung zwischen zwei aufeinanderfolgenden Bindepunkten
As already mentioned, flat-woven sieves have to be stretched strongly to achieve sufficient longitudinal stability with the addition of heat. Longitudinal binding threads are stretched. The associated increase in tension in the binding threads causes disturbing depressions in the sensitive upper fabric. These indentations appear as undesirable marks in the paper. The following relationship can be read from FIG. 5, 15 denoting a surface which runs parallel to the sieve plane:
Figure imgb0001
 It means:
  • 1 ≅ The partial length of the binding thread, ie the length of the binding thread between a binding point in the upper fabric and the binding point in the lower fabric following in the longitudinal direction of the binding thread;
  • d ≅ the fabric thickness measured from the top of the top fabric to the bottom of the bottom fabric;
  • s ≅ the distance by which the two binding points, which follow one another in the longitudinal direction of the binding thread, are laterally offset with respect to the upper fabric in the lower fabric;
  • a ≅ the distance in the longitudinal direction of the twine between two successive tie points

Während des Reckvorgangs wird a entsprechend der Reckung in dieser Richtung gröber. Der Wert s wird jedoch durch den Querschrumpf kleiner. Ebenso verringert sich die Gewebedicke und damit der Wert d.During the stretching process, a becomes coarser in this direction according to the stretching. However, the value s is reduced due to the transverse shrinkage. Likewise, the tissue thickness decreases and thus the value d.

Die Teillänge 1 des Bindefadens kann durch günstige Wahl der Anfangswerte dA, sA und aA konstant gehalten werden.

Figure imgb0002
Es bedeuten:

  • 1A ≅ Teillänge des Bindefadens vor dem Reckvorgang
  • 1E ≅ Teillänge des Bindefadens nach dem Reckvorgang
The partial length 1 of the binding thread can be kept constant by a favorable choice of the initial values d A , s A and a A.
Figure imgb0002
 It means:
  • 1 A ≅ partial length of the twine before stretching
  • 1 E ≅ partial length of the twine after the stretching process

Eine Verstreckung der Bindefäden erfolgt nicht, die gefürchteten Vertiefungen bleiben aus. Die Bedingung 1A = 1E kann in guter Annäherung dadurch erreicht werden, daß der Anfangswert des Bindepunktabstandes a möglichst klein gewählt wird.The binding threads are not stretched and the dreaded depressions are absent. The condition 1 A = 1 E can be achieved in a good approximation by making the initial value of the bond point distance a as small as possible.

Fig. 6 und 7 sind Beispiele für dieses Vorgehen. Bei Bedarf kann der Abstand a jedoch noch kürzer als in diesen beiden Beispielen gewählt werden.6 and 7 are examples of this procedure. If necessary, the distance a can be chosen even shorter than in these two examples.

Bei dem in Fig. 8 dargestellten Gewebe braucht der Bindepunktabstand a nicht kürzer gemacht zu werden, da die Bindepunkte des Obergewebes 10 alle auf nach innen gerichteten Querkröpfungen liegen und somit die Oberfläche nicht wesentlich beeinflussen. Hier ist es ausreichend, Bindefäden mit hoher Dehnung aus Polyester oder Polyamid zu verwenden. In Abhängigkeit von der hohen Dehnung haben solche Fäden einen geringen Wärmeschrumpf entsprechend geringer Schrumpfspannungen.In the tissue shown in Fig. 8, the bond point distance a need not be made shorter because the Tie points of the upper fabric 10 all lie on inward transverse cranks and thus do not significantly affect the surface. It is sufficient here to use high-stretch binding threads made of polyester or polyamide. Depending on the high elongation, such threads have low heat shrinkage corresponding to low shrinkage stresses.

Claims (13)

1. A composite paper making wire as sheet forming part of a paper making machine, comprising at least two complete fabrics which are interlaced by longitudinally directed or cross directed connecting threads, characterized in that at least some of the connecting points (13, 16, 18, 18′, 18˝, 19, 22, 23) of at least some of the connecting threads in the upper fabric (1, 2, 4, 10) are positioned with respect to the connecting points (14, 17, 20, 21, 24, 25) in the lower fabric (3, 7, 8, 9) following respectively in longitudinal direction of the connecting threads, so that those connecting points following to each other alternatively in the upper fabric and the lower fabric in longitudinal direction of the connecting threads are laterally displaced with respect to the perpendicular line of the surface of the wire, the structure being such that the projection of at least some of the connecting threads onto a plane (15) parallel to the surface of the wire is at least in a partial length (1) of its length a zig-zag-line.
2. A composite paper making wire according to claim 1, characterized in that between said partial length (1) of the connecting thread corresponding to the connecting thread length between one connecting point (13) in the upper fabric (4) and the in longitudinal direction of the connecting threads following connecting point (14) in the lower fabric (7), the thickness (d) of the wire measured from the upper side of the upper fabric (4) to the lower side of the lower fabric (7), the distance (s), by which two connecting points following to one another in longitudinal direction of the connecting thread in the lower fabric (7) are laterally displaced with respect to the upper fabric (4), and the distance (a) of two connecting points (13, 14) following to one another in longitudinal direction of the connecting threads, the following relationship exists:
Figure imgb0004
3. A composite paper making wire according to claim 1 or 2, characterized in that the connection threads run in cross machine direction.
4. A composite paper making wire according to claim 1 or 2, characterized in that the connecting threads run in longitudinal machine direction.
5. A composite paper making wire according to one of claims 1-4, characterized in that the upper fabric (1, 5) comprises a two-shed-binding.
6. A composite paper making wire according to one of the claims 1-4, characterized in that the upper fabric (10) comprises a Koeper-binding.
7. A composite paper making wire according to one of the claims 1-6, characterized in that the lower fabric (7) comprises a two-shed-binding.
8. A composite paper making wire according to one of the claims 1-6, characterized in that the lower fabric (8, 9) comprises a Koeper-binding.
9. A composite paper making wire according to claim 8, characterized in that the composite wire consists of two differently fine three-Koeper-fabrics and that the outer side of the upper fabric (10) comprises longitudinal floats and the outer side of the lower fabric (3) comprises cross floats.
10. A composite paper making wire according to one of the claims 1-9, characterized in that the binding threads are multifilament yarns.
11. A composite paper making wire according to one of the claims 1-9, characterized in that the binding threads are monofilament yarns having an elongation of at least 30%.
12. A composite paper making wire according to claim 11, characterized in that the diameter of the binding threads corresponds to at maximum 75% of the diameter of the thickest thread of the upper fabric.
13. A composite paper making wire according to one of the claims 1-12, characterized in that the number of connecting points within the lower fabric is at least so great as the number of the outwardly positioned knuckles of the lower fabric extending in the direction of the connecting threads.
EP88100964A 1987-02-19 1988-01-22 Two-layer cloth for the wet end of a paper-making machine Expired - Lifetime EP0279214B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88100964T ATE62289T1 (en) 1987-02-19 1988-01-22 COMPOSITE FABRIC AS CLOTHING FOR THE SHEET-FORMING PART OF A PAPER MACHINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3705345 1987-02-19
DE19873705345 DE3705345A1 (en) 1987-02-19 1987-02-19 COMPOSITE FABRIC AS A COVER FOR THE SHEET FORMING PART OF A PAPER MACHINE

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EP0279214A2 EP0279214A2 (en) 1988-08-24
EP0279214A3 EP0279214A3 (en) 1988-09-21
EP0279214B1 true EP0279214B1 (en) 1991-04-03

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EP (1) EP0279214B1 (en)
AT (1) ATE62289T1 (en)
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ES (1) ES2021763B3 (en)

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ATE62289T1 (en) 1991-04-15
DE3705345A1 (en) 1988-09-01
ES2021763B3 (en) 1991-11-16
US4945952A (en) 1990-08-07
EP0279214A2 (en) 1988-08-24
DE3862207D1 (en) 1991-05-08
EP0279214A3 (en) 1988-09-21

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