EP0156314B1 - Screen cloth for paper machines - Google Patents

Screen cloth for paper machines Download PDF

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Publication number
EP0156314B1
EP0156314B1 EP85103328A EP85103328A EP0156314B1 EP 0156314 B1 EP0156314 B1 EP 0156314B1 EP 85103328 A EP85103328 A EP 85103328A EP 85103328 A EP85103328 A EP 85103328A EP 0156314 B1 EP0156314 B1 EP 0156314B1
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EP
European Patent Office
Prior art keywords
binding
fabric
threads
making machine
paper making
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85103328A
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German (de)
French (fr)
Other versions
EP0156314A2 (en
EP0156314A3 (en
Inventor
Fritz Vöhringer
Bernhard Dr. Krenkel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
F. OBERDORFER GMBH & CO. KG INDUSTRIEGEWEBE-TECHNI
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.)
Filing date
Publication date
Application filed by F Oberdorfer & Co KG Industriegewebe-Technik GmbH filed Critical F Oberdorfer & Co KG Industriegewebe-Technik GmbH
Priority to AT85103328T priority Critical patent/ATE44059T1/en
Publication of EP0156314A2 publication Critical patent/EP0156314A2/en
Publication of EP0156314A3 publication Critical patent/EP0156314A3/en
Application granted granted Critical
Publication of EP0156314B1 publication Critical patent/EP0156314B1/en
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths

Definitions

  • the invention relates to a paper machine screen, consisting of an upper fabric of any type of weave and a lower fabric of any type of weave, both of which are equipped with their own system of binding threads.
  • Multi-layer screens and composite fabrics in particular paper machine screens, in which the individual screen layers or fabric layers are connected to one another by a binding chain or a binding weft, have long been part of the prior art (DE-PS 2455185, DE-PS 2917694).
  • a two-layer forming fabric consisting of upper fabric and lower fabric
  • a single-layer screen in plain weave is used as the upper fabric
  • a double-layer lower screen is used as the lower fabric.
  • the connection between the top and bottom wire is made with a weft thread of the bottom wire as well as with a separate binding weft.
  • the object of the invention is to further improve the progress achieved so far in the field of binding technology between the various layers of such fabrics with regard to the properties specified above.
  • this object is achieved in that the two binding thread systems are themselves connected to one another.
  • the use of the binding thread systems themselves as connecting elements between the individual fabric layers of sieve belts not only opens up a wide range of possibilities for even more special adaptation of such multi-layer sieves to the specific application or intended use and the prevailing conditions of use, since the binding systems as separate components meet the special requirements of the binding qualities can be produced adapted, but also increases the life of such screens or composite fabrics.
  • Advantageous embodiments of the invention are characterized in the subclaims.
  • the system of crossing binding threads can be both an independent fabric and a scrim.
  • a scrim is understood to mean a system of longitudinal threads 1 and transverse threads 2, which are not interwoven, but are placed one above the other, as can be seen from FIG. 1. Above such a system there is an upper fabric (not shown) of any type of weave and below it a lower fabric (also not shown) of any type of weave.
  • a multi-layer system of this type can also be used.
  • binding thread system forms a scrim or a fabric, wherein several scrims and / or fabrics can also be used as part of the binding thread system, although these cases are not shown in the drawing.
  • the transverse thread 2 of the multiple layer is woven into the upper fabric, and the transverse thread 3 is woven into the lower fabric.
  • the cross thread 4 is not woven with either the upper or the lower fabric. Part of the longitudinal threads 1 is bound into the lower fabric and part into the upper fabric.
  • Twine that does not bind to either the upper or the lower fabric is assigned to the fabric with which the twine system is woven.
  • the thread 7 in FIG. 4 is assigned to the binding thread system of the lower fabric.
  • this thread group forms a multiple fabric with both binding thread systems or it creates a fabric with both binding thread systems. In both cases, this thread group serves to connect the two binding thread systems, which would otherwise remain separate.
  • the binding thread system forms a separate sieve, in which one thread group 6 binds into the upper fabric and the other thread group 5 into the lower fabric.
  • At least some of the binding threads of the binding thread systems can consist of spirals, wherein at least some of the spirals can also be designed as double spirals, which then advantageously consist of polyamide and polyester.
  • Such binder thread systems which form an intermediate fabric and / or intermediate layer, connect the upper fabric to the lower fabric of the paper machine screen in a way which not only improves the quality of the paper produced on it, but also the quality of the screen itself, by in the case of plastic screens, it promotes a compensation of the stresses that occur during thermosetting.

Abstract

1. Paper making machine wire comprising an upper fabric of any kind of binding and a lower fabric of any kind of binding which both are provided with an own system of binding treads, characterized in that the two binding threads systems their selves are connected to one-another.

Description

Die Erfindung betrifft ein Papiermaschinen-Sieb, bestehend aus einem Obergewebe beliebiger Bindungsart und einem Untergewebe beliebiger Bindungsart, die beide mit einem eigenen System von Bindefäden ausgestattet sind.The invention relates to a paper machine screen, consisting of an upper fabric of any type of weave and a lower fabric of any type of weave, both of which are equipped with their own system of binding threads.

Mehrlagige Siebe und Verbundgewebe, insbesondere Papiermaschinen-Siebe, bei denen die einzelnen Sieblagen bzw. Gewebelagen durch eine Bindekette oder einen Bindeschuss miteinander verbunden sind, gehören seit langem zum Stand der Technik (DE-PS 2455185, DE-PS 2917694).Multi-layer screens and composite fabrics, in particular paper machine screens, in which the individual screen layers or fabric layers are connected to one another by a binding chain or a binding weft, have long been part of the prior art (DE-PS 2455185, DE-PS 2917694).

In diesem Zusammenhang hat auch ein zweilagiges, aus Obergewebe und Untergewebe bestehendes Formiersieb als bekannt zu gelten, bei dem als Obergewebe ein einlagiges Sieb in Leinwandbindung und als Untergewebe ein doppellagiges Untersieb Verwendung findet. Dabei wird die Verbindung zwischen Ober- und Untersieb sowohl mit einem Schussfaden des Untersiebs als auch mit einem separaten Bindeschuss hergestellt. All diese zahlreichen und vielfältigen Möglichkeiten der Verbindung von Gewebe- und Gelegelagen mehrlagiger Siebe oder Verbundgewebe, zu denen auch der Einsatz von Hilfsschuss-oder Hilfskettfäden gehört, haben zumindest, was das Papiermachergewebe anbetrifft, letztlich zum Ziel, ein möglichst einfaches, den Festigkeitsanforderungen entsprechendes, nicht markierendes Obergewebe aus möglichst feinem Garn mit einem Untergewebe hoher Verschleissfestigkeit und Längs- sowie Querstabilität zu schaffen, das zudem in der Nasspartie einer Papiermaschine die Papierstoffentwässerung begünstigt.In this context, a two-layer forming fabric consisting of upper fabric and lower fabric has to be regarded as known, in which a single-layer screen in plain weave is used as the upper fabric and a double-layer lower screen is used as the lower fabric. The connection between the top and bottom wire is made with a weft thread of the bottom wire as well as with a separate binding weft. All of these numerous and diverse possibilities of connecting fabric and non-woven fabric layers of multi-layer screens or composite fabrics, which also include the use of auxiliary weft or auxiliary warp threads, have the ultimate goal, at least as far as the papermaker fabric is concerned, as simple as possible, corresponding to the strength requirements. to create non-marking upper fabric from the finest possible yarn with a lower fabric with high wear resistance and longitudinal and transverse stability, which also favors the paper stock drainage in the wet end of a paper machine.

Aufgabe der Erfindung ist es, die bisher erreichten Fortschritte auf dem Gebiet der Bindungstechnik zwischen den verschiedenen Lagen derartiger Gewebe im Hinblick auf die oben angegebenen Eigenschaften weiter zu verbessern.The object of the invention is to further improve the progress achieved so far in the field of binding technology between the various layers of such fabrics with regard to the properties specified above.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass die beiden Bindefadensysteme selbst miteinander verbunden sind. Die Verwendung der Bindefadensysteme selbst als Verbindungselemente zwischen den einzelnen Gewebelagen von Siebbändern eröffnet nicht nur vielfältige Möglichkeiten der noch spezielleren Anpassung solcher mehrlagigen Siebe an den speziellen Verwendungs- bzw. Einsatzzweck und die herrschenden Einsatzbedingungen, da die Bindesysteme als separate Bestandteile an die speziellen Erfordernisse der Bindungsqualitäten angepasst hergestellt werden können, sondern vergrössert auch die Lebensdauer derartiger Siebe bzw. Verbundgewebe. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.According to the invention, this object is achieved in that the two binding thread systems are themselves connected to one another. The use of the binding thread systems themselves as connecting elements between the individual fabric layers of sieve belts not only opens up a wide range of possibilities for even more special adaptation of such multi-layer sieves to the specific application or intended use and the prevailing conditions of use, since the binding systems as separate components meet the special requirements of the binding qualities can be produced adapted, but also increases the life of such screens or composite fabrics. Advantageous embodiments of the invention are characterized in the subclaims.

Die Erfindung wird nachfolgend anhand der in der Zeichnung dargestellten Ausführungsformen näher erläutert. In derZeichnung zeigt:

  • Fig.1 1 eine schematische, perspektivische Draufsicht auf ein Bindefadensystem, das aus einem Gelege sich kreuzender Längs- und Querfäden besteht,
  • Fig. 2 eine perspektivische Draufsicht eines Geleges, entsprechend Fig. 1, bei dem jedoch die Längs- und Querfäden in das Ober- bzw. in das Untergewebe eingewebt sind,
  • Fig. 3 eine perspektivische Draufsicht eines ein separates Sieb bildenden Bindefadensystems, wobei die eine Fadengruppe in das Obergewebe und die andere in das Untergewebe einbindet und
  • Fig.4 eine perspektivische Draufsicht eines Bindefadensystems, bei dem ein Teil der Bindefäden weder mit dem Ober- noch mit dem Untergewebe verbunden ist.
The invention is explained in more detail below with reference to the embodiments shown in the drawing. The drawing shows:
  • 11 shows a schematic, perspective top view of a binding thread system which consists of a cross-stitch of longitudinal and transverse threads,
  • 2 is a top perspective view of a scrim, corresponding to FIG. 1, but in which the longitudinal and transverse threads are woven into the upper and lower fabrics,
  • 3 shows a perspective top view of a binding thread system forming a separate sieve, the one thread group being incorporated into the upper fabric and the other into the lower fabric, and
  • 4 shows a perspective top view of a binding thread system in which a part of the binding threads is neither connected to the upper nor to the lower fabric.

Das System sich kreuzender Bindefäden kann sowohl ein selbständiges Gewebe als auch ein Gelege sein. Unter einem Gelege wird dabei ein System von nicht miteinander verwobenen, sondern übereinander abgelegten Längsfäden 1 und Querfäden 2 verstanden, wie aus Fig. 1 ersichtlich ist. Oberhalb eines solchen Systems befindet sich ein nicht dargestelltes Obergewebe beliebiger Bindungsart und unterhalb desselben ein ebenfalls nicht dargestelltes Untergewebe beliebiger Bindungsart.The system of crossing binding threads can be both an independent fabric and a scrim. A scrim is understood to mean a system of longitudinal threads 1 and transverse threads 2, which are not interwoven, but are placed one above the other, as can be seen from FIG. 1. Above such a system there is an upper fabric (not shown) of any type of weave and below it a lower fabric (also not shown) of any type of weave.

Anstelle eines einlagigen Bindefadensystems aus sich kreuzenden Längs- und Querfäden, wie dies in Fig. 1 dargestellt ist, kann auch ein mehrlagiges System dieser Art Verwendung finden.Instead of a single-layer binding system consisting of crossing longitudinal and transverse threads, as shown in FIG. 1, a multi-layer system of this type can also be used.

Durch entsprechendes Einweben der sich kreuzenden Längs- und Querfäden in das Ober- bzw. Untergewebe lässt sich eine feste Verankerung sowohl zwischen den beiden Geweben als auch innerhalb des Geleges erzielen, wie aus den Fig. 1 und 2 ersichtlich ist. In gewissen Fällen mag es ausreichen, wenn nur ein Teil des Bindefadensystems in das Obergewebe eingewebt wird, wie auch nur ein Teil des Bindefadensystems ins Untergewebe eingewebt werden kann.By appropriately weaving the crossing longitudinal and transverse threads into the upper and lower fabrics, a firm anchoring can be achieved both between the two fabrics and within the scrim, as can be seen from FIGS. 1 and 2. In certain cases it may be sufficient if only a part of the binding thread system is woven into the upper fabric, just as only a part of the binding thread system can be woven into the lower fabric.

Ebenso ist die Möglichkeit gegeben, dass nur ein Teil des Bindefadensystems ein Gelege oder ein Gewebe bildet, wobei auch mehrere Gelege und/oder Gewebe als Teil des Bindefadensystems zur Anwendung gelangen können, obgleich diese Fälle in der Zeichnung nicht dargestellt sind.There is also the possibility that only a part of the binding thread system forms a scrim or a fabric, wherein several scrims and / or fabrics can also be used as part of the binding thread system, although these cases are not shown in the drawing.

Bei der in der Zeichnung in Fig. gezeigten Ausführungsform ist der Querfaden 2 des mehrfachen Geleges in das Obergewebe, der Querfaden 3 in das Untergewebe eingewebt. Der Querfaden 4 ist weder mit dem Ober- noch mit dem Untergewebe verwebt. Von den Längsfäden 1 ist ein Teil in das Untergewebe und ein Teil in das Obergewebe eingebunden.In the embodiment shown in the drawing in FIG. 2, the transverse thread 2 of the multiple layer is woven into the upper fabric, and the transverse thread 3 is woven into the lower fabric. The cross thread 4 is not woven with either the upper or the lower fabric. Part of the longitudinal threads 1 is bound into the lower fabric and part into the upper fabric.

Bindefäden, die weder mit dem Ober- noch mit dem Untergewebe abbinden, werden dem Gewebe zugeordnet, mit dessen Bindefadensystem sie verwoben sind. So ist beispielsweise der Faden 7 in Fig. 4 dem Bindefadensystem des Untergewebes zugeordnet. Es gibt aber auch Bindefäden, beispielsweise der Faden 4 in Fig. 2, die wahlweise beiden Bindefadensystemen zugeordnet werden können. In diesem Fall bildet diese Fadengruppe mit beiden Bindefadensystemen ein mehrfaches Gelege oder sie erzeugt mit beiden Bindefadensystemen ein Gewebe. In beiden Fällen dient diese Fadengruppe zur Verbindung der beiden Bindefadensysteme, die sonst getrennt bleiben würden.Twine that does not bind to either the upper or the lower fabric is assigned to the fabric with which the twine system is woven. For example, the thread 7 in FIG. 4 is assigned to the binding thread system of the lower fabric. However, there are also binding threads, for example thread 4 in FIG. 2, which are optionally assigned to both binding thread systems that can. In this case, this thread group forms a multiple fabric with both binding thread systems or it creates a fabric with both binding thread systems. In both cases, this thread group serves to connect the two binding thread systems, which would otherwise remain separate.

Bei der Ausführungsform nach Fig. 3 bildet das Bindefadensystem ein separates Sieb, bei dem die eine Fadengruppe 6 in das Obergewebe und die andere Fadengruppe 5 in das Untergewebe einbindet. Durch eine entsprechende Auswahl der Abstände, Durchmesser und Materialien der Fäden des Bindefadensystems lassen sich optimale Bindepunktverteilungen bei weitgehender Reduzierung der Gefahr der Markierung der auf dem Obergewebe liegenden Papierstoffbahn erreichen.In the embodiment according to FIG. 3, the binding thread system forms a separate sieve, in which one thread group 6 binds into the upper fabric and the other thread group 5 into the lower fabric. A suitable selection of the distances, diameters and materials of the threads of the binding thread system enables optimum binding point distributions to be achieved while substantially reducing the risk of marking the paper web lying on the upper fabric.

Alle Versuche auf Feinpapiermaschinen mit durch Bindeketten oder Bindeschüssen zusammengewebten Verbundgeweben sind bisher daran gescheitert, dass die Bindekräfte über die Bindefäden auf direktem Wege vom sehr steifen, groben Untergewebe auf das feine, nachgiebige Obergewebe übertragen wurden, was zur Folge hatte, dass sowohl bei der Siebherstellung (Weben und Fixieren) als auch im Einsatz auf der Papiermaschine von den Bindefäden verursachte Vertiefungen im feinen Obergewebe entstanden, die entsprechende Formationsstörungen und Markierungen im Papier hervorriefen.All attempts on fine paper machines with composite fabrics woven together by binding chains or binding wefts have so far failed because the binding forces were transferred directly from the very stiff, coarse lower fabric to the fine, compliant upper fabric via the binding threads, which had the consequence that both in the manufacture of the screen (Weaving and fixing) as well as depressions in the fine upper fabric caused by the binding threads in use on the paper machine, which caused corresponding formation disorders and markings in the paper.

Durch die besondere Elastizität der hier beschriebenen, erfindungsgemässen Bindefadensysteme werden solche Störungen von vornherein vermieden.Due to the special elasticity of the binding thread systems according to the invention described here, such disturbances are avoided from the outset.

Die bereits oben erwähnte Möglichkeit, dass ein Teil der Fäden des Bindefadensystems weder in das Ober- noch in das Untergewebe einbindet, ist in Fig.4 durch Ausbildung und Verlauf des Querfadens 7 angedeutet. Nur die Längsfäden 5 und die Querfäden 6 sind mit dem Unter- bzw. Obergewebe verbunden.The possibility already mentioned above that a part of the threads of the binding thread system does not bind into either the upper or the lower fabric is indicated in FIG. 4 by the design and course of the transverse thread 7. Only the longitudinal threads 5 and the transverse threads 6 are connected to the lower and upper fabrics.

Zur weiteren Verbesserung der Gleichmässigkeit der Oberflächenstruktur des Obergewebes und damit insbesondere zur Vermeidung von Markierungen können wenigstens einige der Bindefäden der Bindefadensysteme aus Spiralen bestehen, wobei darüber hinaus zumindest ein Teil der Spiralen als Doppelspiralen ausgebildet sein können, die dann vorteilhafterweise aus Polyamid und Polyester bestehen. Solche Bindefadensysteme, die ein Zwischengewebe und/oder Zwischengelege bilden, verbinden das Obergewebe mit dem Untergewebe des Papiermaschinen-Siebes in einer Weise, die nicht nur die Qualität des Papiers verbessert, das auf ihm hergestellt wird, sondern auch die Qualität des Siebes selbst, indem sie im Falle von Kunststoffsieben einen Ausgleich der bei derThermofixierung auftretenden Spannungen fördert.To further improve the uniformity of the surface structure of the upper fabric and thus in particular to avoid markings, at least some of the binding threads of the binding thread systems can consist of spirals, wherein at least some of the spirals can also be designed as double spirals, which then advantageously consist of polyamide and polyester. Such binder thread systems, which form an intermediate fabric and / or intermediate layer, connect the upper fabric to the lower fabric of the paper machine screen in a way which not only improves the quality of the paper produced on it, but also the quality of the screen itself, by in the case of plastic screens, it promotes a compensation of the stresses that occur during thermosetting.

Claims (8)

1. Paper making machine wire comprising an upper fabric of any kind of binding and a lowerfa- bric of any kind of binding which both are provided with an own system of binding threads, characterized in that the two binding thread systems theirselves are connected to one-another.
2. Paper making machine wire according to claim 1, characterized in that the two binding thread systems consist of at least one layer of longitudinal threads and at least one layer of cross-threads.
3. Paper making machine wire according to claim 2, characterized in that at least a portion of the binding thread systems forms at least one layer.
4. Paper making machine wire according to claim 2, characterized in that at least a portion of the binding thread systems forms at least a fabric.
5. Paper making machine wire according to one of the claims 1-4, characterized in that at least a portion of the binding thread systems is bound into the upper fabric and an other portion is bound into the lower fabric.
6. Paper making machine wire according to one of the claims 1-5, characterized in that at least certain of the binding threads or binding thread systems consist of spirals.
7. Paper making machine wire according to claim 6, characterized in that at least a portion of the spirals are configured as duplicate spirals.
8. Paper making machine wire according to claim 7, characterized in that the duplicate spirals consist of polyester and polyamide.
EP85103328A 1984-03-26 1985-03-21 Screen cloth for paper machines Expired EP0156314B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85103328T ATE44059T1 (en) 1984-03-26 1985-03-21 PAPER MACHINE SCREEN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3411119 1984-03-26
DE19843411119 DE3411119A1 (en) 1984-03-26 1984-03-26 PAPER MACHINE SCREEN

Publications (3)

Publication Number Publication Date
EP0156314A2 EP0156314A2 (en) 1985-10-02
EP0156314A3 EP0156314A3 (en) 1986-08-27
EP0156314B1 true EP0156314B1 (en) 1989-06-14

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ID=6231657

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85103328A Expired EP0156314B1 (en) 1984-03-26 1985-03-21 Screen cloth for paper machines

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EP (1) EP0156314B1 (en)
AT (1) ATE44059T1 (en)
DE (1) DE3411119A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3903198C2 (en) * 1989-02-03 1999-11-18 Kufferath Andreas Gmbh Multi-layer screen fabric of a paper machine
DE59802555D1 (en) * 1998-11-18 2002-01-31 Heimbach Gmbh Thomas Josef Textile fabrics

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB451752A (en) * 1936-01-01 1936-08-11 Thomas Hardman And Sons Ltd An improved felt for use in the manufacture of paper, cardboard and analogous materials
US3885603A (en) * 1973-11-21 1975-05-27 Creech Evans S Papermaking fabric
SE420852B (en) * 1978-06-12 1981-11-02 Nordiskafilt Ab The forming fabric
GB2047192B (en) * 1979-04-21 1983-05-18 Scapa Porritt Ltd Conveying and like structures
DE3301810C2 (en) * 1983-01-20 1986-01-09 Hermann Wangner Gmbh & Co Kg, 7410 Reutlingen Composite fabric as a covering for the sheet forming part of a paper machine

Also Published As

Publication number Publication date
DE3411119A1 (en) 1985-10-03
EP0156314A2 (en) 1985-10-02
ATE44059T1 (en) 1989-06-15
EP0156314A3 (en) 1986-08-27

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