EP0399301A2 - Felt for papermaking machine - Google Patents

Felt for papermaking machine Download PDF

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Publication number
EP0399301A2
EP0399301A2 EP90108806A EP90108806A EP0399301A2 EP 0399301 A2 EP0399301 A2 EP 0399301A2 EP 90108806 A EP90108806 A EP 90108806A EP 90108806 A EP90108806 A EP 90108806A EP 0399301 A2 EP0399301 A2 EP 0399301A2
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EP
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Prior art keywords
felt
threads
fabric
screen
fabrics
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Granted
Application number
EP90108806A
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German (de)
French (fr)
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EP0399301B1 (en
EP0399301A3 (en
Inventor
Hans Dipl.-Ing. Marx
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Jj Marx GmbH
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Jj Marx GmbH
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Publication of EP0399301A2 publication Critical patent/EP0399301A2/en
Publication of EP0399301A3 publication Critical patent/EP0399301A3/en
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Publication of EP0399301B1 publication Critical patent/EP0399301B1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/083—Multi-layer felts

Definitions

  • the invention relates to a felt cloth for paper machines, in particular a wet felt for the press section made of at least one screen fabric and at least one nonwoven layer needled therewith.
  • felt cloths are required in paper machines in the press section and in the dryer section, which are used to transport the paper web and in particular in the press section to receive and discharge the squeezed water.
  • the felt fabrics used here can be formed from a screen fabric onto which several layers of nonwoven fabric are needled.
  • the disadvantage of these felt towels is that they get dirty relatively quickly, thereby compacting and, finally, can hardly remove water from the paper stock. This applies especially to the wet end of the press section.
  • a felt washing device is often arranged on the press section and the wet felt is then washed continuously or discontinuously during its use in order to keep it open as long as possible and thus functional.
  • the felt cloth is formed from a plurality of independent screen fabrics, at least one of the fabrics being needled with a nonwoven layer.
  • the felt cloth consists of several base fabrics, which can move relative to each other, which consequently loosens the needled fibers of the nonwoven fabric, as a result of which the dirt adhering to the fibers is more easily removed from the felt cloth.
  • Felted fabrics with this structure are often used with great success.
  • the object of the present invention is to further develop the known felt cloths and to achieve an even better drainage performance.
  • the compacting of the felt is to be reduced and a longer openness through less dirt accumulation and thus a longer service life of the felt is sought.
  • the object is achieved in a felt cloth of the type mentioned in the invention in that an insert formed from longitudinal threads is inserted between the screen fabric and the nonwoven layer and / or the screen fabrics.
  • This insert without transverse threads leads to the formation of channels in the interior of the felt, which ensure improved water flow in and through the felt. This results in the improved drainage performance and longer service life of the felts.
  • Another advantage arises from the fact that the long thread layer prevents the upper fabric from being able to press into the openings of the lower fabric with its offset points. It should be noted that with the same or a similar weave of the screen fabric, this indentation of the cranks in the openings of the adjacent fabric is possible in the course of the pressing during the life of the felt, with the result that the felt is compressed.
  • the new felt cloth compared to the prior art, also has a greater flexibility in the transverse direction, which facilitates the installation of the felt in the paper machine. At the same time, the felt showed excellent dimensional stability.
  • the longitudinal threads can be formed from monofilaments.
  • monofilament thread is also possible.
  • highly elastic threads such as rubber threads.
  • the thickness of the long threads is preferably selected so that it is approximately 1.3 times the thickness of the sieve fabric threads.
  • the basic idea of the present invention namely the insertion of an insert between Vies and sieve fabric or two sieve fabrics, can be used in different combinations with felt cloths.
  • a three-layer screen fabric only a single insert can be used, but it is also possible to use two inlays, one of which is inserted between two screen fabrics.
  • Other combinations in, for example, five-layer screen fabrics are also conceivable in order to achieve the effect of the invention.
  • the combination of a fleece, an insert and a sieve fabric or a fleece, two inserts and a sieve fabric is also conceivable.
  • the felt cloth shown in detail in the figure consists of two superimposed screen fabrics 2 and 3 and the nonwoven layer 4.
  • the two screen fabrics 2 and 3 are formed in the usual way from the longitudinal threads 6 and 7 and the transverse threads 8 and 9 or 10 and 11. Both screen fabrics are independent of each other, i. H. neither connected by cross threads nor long threads.
  • the fleece layer 4 is formed from the fibers 22 and is located on the paper side of the felt cloth 1.
  • the fleece layer 4 is needled onto the two screen fabrics 2 and 3 in the known needle method.
  • the fibers 12 running from top to bottom between the longitudinal threads 6 and 7 are intended to represent the needled fibers of the fleece 4.
  • the insert consists of adjacent longitudinal threads, which are inserted between the screen fabrics 2 and 3.
  • the longitudinal threads of the insert are monofilaments 14 and monofilament twine 13.
  • the insert has no transverse threads.
  • the monofilament thread 13 is formed from three, five or more filaments. The use of monofilament thread gives a higher elastic effect.

Abstract

A felt for papermaking machines is proposed which consists of one or more wire screens and at least one nonwoven layer needle-punched thereto. In order to achieve a very high drainage rate with these felts, a ply formed only from longitudinal threads is inserted between the wire screen and the nonwoven layer or between the wire screens.

Description

Die Erfindung betrifft ein Filztuch für Papiermaschinen, insbesondere einen Naßfilz für die Pressenpartie aus wenigstens einem Siebgewebe und mindestens einer damit vernadelten Vlies­schicht.The invention relates to a felt cloth for paper machines, in particular a wet felt for the press section made of at least one screen fabric and at least one nonwoven layer needled therewith.

Bei der Herstellung von Papier werden in Papiermaschinen in der Pressenpartie und in der Trockenpartie Filztuche be­nötigt, die zum Transport der Papierbahn und insbesondere in der Pressenpartie zur Aufnahme und zum Abführen des ausgepreßten Wassers dienen. Die hier zum Einsatz gelangenden Filztuche können aus einem Siebgewebe gebildet sein, auf das mehrere Faservlies­schichten aufgenadelt sind. Von Nachteil bei diesen Filztuchen ist, daß sie relativ schnell verschmutzen, sich dadurch ver­dichten und schließlich kaum noch Wasser aus dem Papierstoff abführen können. Dieses trifft vor allem bei Naßfilzen der Pressenpartie zu. Um eine längere Laufzeit der Naßfilze zu er­reichen ist vielfach an der Pressenpartie eine Filzwascheinrichtung angeordnet und der Naßfilz wird dann kontinuierlich oder diskonti­nuierlich während seines Arbeitseinsatzes gewaschen, um ihn möglichst lange offen und damit funktionsfähig zu halten. Die Verdichtung des Naßfilzes durch Schmutzteilchen wird dadurch gefördert, daß der Naßfilz in dem Pressendurchgang in regel­mäßigen, sehr häufig wiederkehrenden Abständen, zusammengedrückt und verdichtet wird. Hierdurch tritt eine natürliche Erlahmung der Sprungkraft der Fasern ein und trotz aller Wascheinrichtungen tritt insbesondere im Filzkern eine zunehmende Undurchlässigkeit durch den im Filz zurückbleibenden Schmutz auf.In the manufacture of paper, felt cloths are required in paper machines in the press section and in the dryer section, which are used to transport the paper web and in particular in the press section to receive and discharge the squeezed water. The felt fabrics used here can be formed from a screen fabric onto which several layers of nonwoven fabric are needled. The disadvantage of these felt towels is that they get dirty relatively quickly, thereby compacting and, finally, can hardly remove water from the paper stock. This applies especially to the wet end of the press section. In order to achieve a longer running time of the wet felts, a felt washing device is often arranged on the press section and the wet felt is then washed continuously or discontinuously during its use in order to keep it open as long as possible and thus functional. The compression of the wet felt by dirt particles is promoted in that the wet felt is compressed and compressed in the press passage at regular, very frequently recurring intervals. This results in a natural weakening of the elasticity of the fibers and despite all the washing devices, an increasing impermeability occurs in the felt core due to the dirt remaining in the felt.

Durch die DE OS 24 37 303 wird, um eine möglichst lange Rein­haltung des Filztuches und damit eine möglichst lange Laufzeit desselben zu erreichen, das Filztuch aus mehreren, voneinander unabhängigen Siebgeweben gebildet, wobei wenigstens eines der Gewebe mit einer Faservliesschicht benadelt ist. Das Filztuch besteht aus mehreren Grundgeweben, die sich relativ zueinander bewegen können, was in der Folge eine Auflockerung der einge­nadelten Fasern des Faservlieses bewirkt, wodurch der an den Fasern anhaftende Schmutz leichter aus dem Filztuch entfernt wird. Filztuche mit diesem Aufbau werden vielfach mit großem Erfolg eingesetzt.From DE OS 24 37 303, in order to keep the felt cloth as long as possible and thus as long as possible, the felt cloth is formed from a plurality of independent screen fabrics, at least one of the fabrics being needled with a nonwoven layer. The felt cloth consists of several base fabrics, which can move relative to each other, which consequently loosens the needled fibers of the nonwoven fabric, as a result of which the dirt adhering to the fibers is more easily removed from the felt cloth. Felted fabrics with this structure are often used with great success.

Dervorliegenden Erfindung liegt die Aufgabe zu Grunde, die bekannten Filztücher noch weiterzuentwickeln und eine noch bessere Entwässerungsleistung zu erreichen. Die Kompaktierung des Filzes soll vermindert werden und eine längere Offenheit durch geringere Schmutzanlagerung und damit auch eine längere Standzeit des Filzes wird angestrebt.The object of the present invention is to further develop the known felt cloths and to achieve an even better drainage performance. The compacting of the felt is to be reduced and a longer openness through less dirt accumulation and thus a longer service life of the felt is sought.

Die Lösung der gestellten Aufgabe wird bei einem Filztuch der eingangs genannten Gattung erfindungsgemäß dadurch erreicht, daß zwischen dem Siebgewebe und der Vliesschicht und/oder den Siebgeweben eine aus Längsfäden gebildete Einlage eingefügt ist. Diese Einlage ohne Querfäden führt dazu, daß sich im Filzinneren Kanäle bilden, die für einen verbesserten Wasserfluß im und durch den Filz sorgen. Dadurch ergibt sich die verbesserte Entwässerungsleistung und längere Standzeit der Filze. Ein weiterer Vorteil tritt dadurch auf, daß durch die Langfaden­schicht verhindert wird, daß das Obergewebe sich mit seinen Kröpfungspunkten in die Öffnungen des Untergewebes eindrücken kann. Hierzu sei bemerkt, daß bei gleicher oder ähnlicher Bin­dung der Siebgewebe dieses Eindrücken der Kröpfungen in die Öffnungen des benachbarten Gewebes im Laufe der Verpressung während der Filzlebensdauer möglich ist, mit der Folge einer Verdichtung der Filzes.The object is achieved in a felt cloth of the type mentioned in the invention in that an insert formed from longitudinal threads is inserted between the screen fabric and the nonwoven layer and / or the screen fabrics. This insert without transverse threads leads to the formation of channels in the interior of the felt, which ensure improved water flow in and through the felt. This results in the improved drainage performance and longer service life of the felts. Another advantage arises from the fact that the long thread layer prevents the upper fabric from being able to press into the openings of the lower fabric with its offset points. It should be noted that with the same or a similar weave of the screen fabric, this indentation of the cranks in the openings of the adjacent fabric is possible in the course of the pressing during the life of the felt, with the result that the felt is compressed.

Erfahrungsgemäß entstehen die Schmutzanlagerungen vorwiegend an den Kröpfungspunkten, d. h. den Bindungspunkten der Gewebe mit den daraus resultierenden nachteiligen Folgen. Die Gefahr von Ablagerungen oder Anlagerungen in den Gewebemaschen im Bereich der Langfäden besteht jedoch nicht.Experience has shown that dirt accumulates primarily at the offset points, i.e. H. the binding points of the tissues with the resulting adverse consequences. However, there is no risk of deposits or deposits in the fabric loops in the area of the long threads.

In Versuchen zeigte sich, daß das neue Filztuch im Vergleich zum Stand der Technik auch eine höhere Flexibilität in Quer­richtung hat, die den Einbau des Filzes in die Papiermaschine erleichtert. Gleichzeitig zeigte der Filz eine hervorragende Maßstabilität.Experiments have shown that the new felt cloth, compared to the prior art, also has a greater flexibility in the transverse direction, which facilitates the installation of the felt in the paper machine. At the same time, the felt showed excellent dimensional stability.

In der einfachsten Ausführungsform können die Längsfäden aus Monofilamenten gebildet sein. Der Einsatz von Monofilamentzwirn ist jedoch auch möglich. Ebenso der Einsatz von hochelastischen Fäden, wie Gummifäden. Bevorzugt wird die Stärke der Langfäden so gewählt, daß sie etwa das 1,3-Fache der Stärke der Siebgewebefäden ist.In the simplest embodiment, the longitudinal threads can be formed from monofilaments. However, the use of monofilament thread is also possible. Likewise, the use of highly elastic threads, such as rubber threads. The thickness of the long threads is preferably selected so that it is approximately 1.3 times the thickness of the sieve fabric threads.

Es versteht sich, daß der Grundgedanke der vorliegenden Erfindung, nämlich die Einfügung einer Einlage zwischen Vies und Siebgewebe bzw. zwei Siebgeweben, in unterschiedlichen Kombinationen bei Filz­tüchern angewendet werden kann. So kann bei einem dreilagigen Sieb­gewebe nur eine einzelne Einlage verwendet werden, es ist aber auch möglich, zwei Einlagen zu verwenden, wovon jeweils eine zwischen zwei Siebgeweben eingefügt ist. Auch andere Kominationen bei bei­spielsweise fünflagigen Siebgeweben sind denkbar, um den Effekt der Erfindung zu erreichen. Es ist beispielsweise auch die Kombination eines Vlieses, einer Einlage und eines Siebgewebes oder eines Vlieses, zweier Einlagen und eines Siebgewebes denkbar.It goes without saying that the basic idea of the present invention, namely the insertion of an insert between Vies and sieve fabric or two sieve fabrics, can be used in different combinations with felt cloths. For example, with a three-layer screen fabric, only a single insert can be used, but it is also possible to use two inlays, one of which is inserted between two screen fabrics. Other combinations in, for example, five-layer screen fabrics are also conceivable in order to achieve the effect of the invention. For example, the combination of a fleece, an insert and a sieve fabric or a fleece, two inserts and a sieve fabric is also conceivable.

Anhand eines in der Figur dargestellten schematischen Ausführungs­beispiels wird die Erfindung näher erläutert.The invention is explained in more detail with reference to a schematic exemplary embodiment shown in the figure.

Das in der Figur ausschnittweise gezeigte Filztuch besteht aus zwei übereinanderliegenden Siebgeweben 2 und 3 und der Faservliesschicht 4. Die beiden Siebgewebe 2 und 3 sind in üblicher Weise aus den Längsfäden 6 und 7 und den Querfäden 8 und 9 bzw. 10 und 11 gebildet. Beide Siebgewebe sind voneinander unabhängig, d. h. weder durch Querfäden noch Langfäden miteinander verbunden. Die Vliesschicht 4 ist aus den Fasern 22 gebildet und befindet sich an der Papierseite des Filztuches 1. Die Vliesschicht 4 ist auf die beiden Siebgewebe 2 und 3 im bekannten Nadelverfahren aufgenadelt. Die zwischen den Längsfäden 6 und 7 von oben nach unter verlaufenden Fasern 12 sollen die durchnadelten Fasern des Vlieses 4 darstellen. Die Einlage besteht aus nebeneinander liegenden Längsfäden, die zwischen die Sieb­gewebe 2 und 3 eingefügt sind.The felt cloth shown in detail in the figure consists of two superimposed screen fabrics 2 and 3 and the nonwoven layer 4. The two screen fabrics 2 and 3 are formed in the usual way from the longitudinal threads 6 and 7 and the transverse threads 8 and 9 or 10 and 11. Both screen fabrics are independent of each other, i. H. neither connected by cross threads nor long threads. The fleece layer 4 is formed from the fibers 22 and is located on the paper side of the felt cloth 1. The fleece layer 4 is needled onto the two screen fabrics 2 and 3 in the known needle method. The fibers 12 running from top to bottom between the longitudinal threads 6 and 7 are intended to represent the needled fibers of the fleece 4. The insert consists of adjacent longitudinal threads, which are inserted between the screen fabrics 2 and 3.

Im gewählten Beispiel sind die Längsfäden der Einlage Monofilamente 14 und Monofilamentzwirn 13. Die Einlage weist keine Querfäden auf. Der Monofilamentzwirn 13 ist aus drei, fünf oder mehr Filamenten gebildet. Der Einsatz von Monofilamentzwirn ergibt einen höheren elastischen Effekt.In the example selected, the longitudinal threads of the insert are monofilaments 14 and monofilament twine 13. The insert has no transverse threads. The monofilament thread 13 is formed from three, five or more filaments. The use of monofilament thread gives a higher elastic effect.

Claims (4)

1. Filztuch für Papiermaschinen, insbesondere Naßfilz für die Pressenpartie, aus einem oder mehreren Siebgeweben und mindestens einer damit vernadelten Vliesschicht, dadurch gekennzeichnet, daß zwischen dem Siebgewebe (2) und der Vliesschicht (4) und/oder den Siebgeweben (2,3) eine aus Längsfäden (14) gebildete Einlage (13) eingefügt ist.1. felt cloth for paper machines, in particular wet felt for the press section, of one or more screen fabrics and at least one nonwoven layer needled therewith, characterized in that between the screen fabric (2) and the nonwoven layer (4) and / or the screen fabrics (2, 3) an insert (13) formed from longitudinal threads (14) is inserted. 2. Filztuch nach Anspruch 1, dadurch gekennzeichnet, daß die Längsfäden (14) Monofilamente sind.2. felt cloth according to claim 1, characterized in that the longitudinal threads (14) are monofilaments. 3. Filztuch nach Anspruch 1, dadurch gekennzeichnet, daß die Längsfäden (13) aus Monofilamentzwirn gebildet sind.3. felt cloth according to claim 1, characterized in that the longitudinal threads (13) are formed from monofilament thread. 4. Filztuch nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Stärke der Längsfäden das 1,3-Fache der Stärke der Siebgewebefäden ist.4. felt cloth according to one of claims 1 to 3, characterized in that the thickness of the longitudinal threads is 1.3 times the thickness of the sieve fabric threads.
EP90108806A 1989-05-16 1990-05-10 Felt for papermaking machine Expired - Lifetime EP0399301B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3915909 1989-05-16
DE3915909A DE3915909A1 (en) 1989-05-16 1989-05-16 FELT CLOTH FOR PAPER MACHINES

Publications (3)

Publication Number Publication Date
EP0399301A2 true EP0399301A2 (en) 1990-11-28
EP0399301A3 EP0399301A3 (en) 1991-02-27
EP0399301B1 EP0399301B1 (en) 1994-11-30

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ID=6380740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90108806A Expired - Lifetime EP0399301B1 (en) 1989-05-16 1990-05-10 Felt for papermaking machine

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EP (1) EP0399301B1 (en)
AT (1) ATE114752T1 (en)
DE (2) DE3915909A1 (en)
ES (1) ES2064522T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2287257A (en) * 1994-03-10 1995-09-13 Scapa Group Plc Papermakers marking felt

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4040861C3 (en) * 1990-12-20 2001-02-01 Conrad Munzinger & Cie Ag Olte Press felt and process for its production
DE19731019A1 (en) * 1997-07-18 1999-01-21 Voith Sulzer Papiermasch Gmbh Paper-making press blanket

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564985A (en) * 1981-10-08 1986-01-21 Nippon Felt Co., Ltd. Felt for paper manufacture and method for producing the same
EP0307183A1 (en) * 1987-09-09 1989-03-15 ASTEN GROUP INC. (a Delaware corporation) Wet press felt and method of making same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564985A (en) * 1981-10-08 1986-01-21 Nippon Felt Co., Ltd. Felt for paper manufacture and method for producing the same
EP0307183A1 (en) * 1987-09-09 1989-03-15 ASTEN GROUP INC. (a Delaware corporation) Wet press felt and method of making same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2287257A (en) * 1994-03-10 1995-09-13 Scapa Group Plc Papermakers marking felt

Also Published As

Publication number Publication date
ATE114752T1 (en) 1994-12-15
EP0399301B1 (en) 1994-11-30
EP0399301A3 (en) 1991-02-27
DE3915909A1 (en) 1990-11-22
ES2064522T3 (en) 1995-02-01
DE59007803D1 (en) 1995-01-12

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