EP0399301A2 - Felt for papermaking machine - Google Patents
Felt for papermaking machine Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- felt
- threads
- fabric
- screen
- fabrics
- 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.)
- Granted
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Classifications
-
- 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
Landscapes
- Paper (AREA)
Abstract
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
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
Claims (4)
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 |
Family
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 |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0399301B1 (en) |
AT (1) | ATE114752T1 (en) |
DE (2) | DE3915909A1 (en) |
ES (1) | ES2064522T3 (en) |
Cited By (1)
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)
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)
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 |
-
1989
- 1989-05-16 DE DE3915909A patent/DE3915909A1/en not_active Withdrawn
-
1990
- 1990-05-10 ES ES90108806T patent/ES2064522T3/en not_active Expired - Lifetime
- 1990-05-10 AT AT90108806T patent/ATE114752T1/en not_active IP Right Cessation
- 1990-05-10 EP EP90108806A patent/EP0399301B1/en not_active Expired - Lifetime
- 1990-05-10 DE DE59007803T patent/DE59007803D1/en not_active Expired - Fee Related
Patent Citations (2)
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)
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 |
---|---|
EP0399301B1 (en) | 1994-11-30 |
ATE114752T1 (en) | 1994-12-15 |
EP0399301A3 (en) | 1991-02-27 |
ES2064522T3 (en) | 1995-02-01 |
DE59007803D1 (en) | 1995-01-12 |
DE3915909A1 (en) | 1990-11-22 |
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