EP0126943A2 - Multi-layered forming screen for the wet end of a paper machine - Google Patents

Multi-layered forming screen for the wet end of a paper machine Download PDF

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Publication number
EP0126943A2
EP0126943A2 EP84104291A EP84104291A EP0126943A2 EP 0126943 A2 EP0126943 A2 EP 0126943A2 EP 84104291 A EP84104291 A EP 84104291A EP 84104291 A EP84104291 A EP 84104291A EP 0126943 A2 EP0126943 A2 EP 0126943A2
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EP
European Patent Office
Prior art keywords
fabric
paper machine
wet end
weft
layer
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
Application number
EP84104291A
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German (de)
French (fr)
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EP0126943A3 (en
EP0126943B1 (en
Inventor
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
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Application filed by F Oberdorfer & Co KG Industriegewebe-Technik GmbH filed Critical F Oberdorfer & Co KG Industriegewebe-Technik GmbH
Priority to AT84104291T priority Critical patent/ATE35705T1/en
Publication of EP0126943A2 publication Critical patent/EP0126943A2/en
Publication of EP0126943A3 publication Critical patent/EP0126943A3/en
Application granted granted Critical
Publication of EP0126943B1 publication Critical patent/EP0126943B1/en
Expired 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

Definitions

  • the invention relates to a two-layer forming fabric consisting of upper fabric and lower fabric for the wet party of a paper machine.
  • Papermaker's fabrics of this type always have a single-layer bottom fabric as wear fabric, which in practice is usually woven in a single weave or in cross-twill weave. Such a wear fabric cannot be made arbitrarily rough, because otherwise its structure will appear on the forming side of the upper fabric and thus lead to markings in the paper. However, this limits the stability of such screens and their service life.
  • the invention has for its object a screen of the type mentioned, the sheet formation side consists of a simple, non-marking fabric made of fine yarn, while the fabric on the running side be wear-resistant and of high longitudinal and transverse stability and for the purpose of coarse threads should exist so that the coarse sub-fabric does not appear on the sheet formation side. Furthermore, drainage impulses in the tissue are to be strongly dampened.
  • the warp density of the lower fabric is greater than 8.
  • the warp density is calculated from the diameter of the warp thread and the number of warp threads per centimeter, multiplied by a factor of 10.
  • a particularly preferred embodiment of the forming fabric according to the invention is obtained when the lower fabric is woven in a multi-layer weave, with which an exceptionally high longitudinal and transverse stability, as has hitherto only been achieved by metal fabrics, is obtained.
  • the high warp density of more than 8 of the wear fabric also leads to very high retention values with sufficient drainage performance, and the high volume of the wear fabric offers the further advantage that the drainage impulses are strongly damped and paper of the same high quality can be produced as before was not possible.
  • a 1 x 1 weave upper fabric 10 made of relatively fine warp threads 11 and weft threads 12 is connected to a lower fabric 20 which is woven in two layers, its warp thread 21 with a strong, wear-bearing lower weft thread 22 and one in the top layer of the Underlying 20 lying, thinner weft 23 is woven.
  • the binding of the two-ply lower fabric 20 is selected so that the paper machine screen is designed as a weft runner and has a very stable wear side.
  • the upper and lower fabrics 10, 20 are connected to one another with the aid of individual weft threads 23 of the upper layer of the lower fabric 20, which are interwoven at greater distances with individual warp threads 11 of the upper fabric.
  • the binding points can be arranged in such a way that they practically do not appear on the paper.
  • Figures 1 and 2 also show that the lower fabric 20 has a high warp density (Fig. 2) and this fact in connection with the high volume leads to a strong damping of the drainage impulses and thus to high paper quality.
  • FIG. 3 shows a further exemplary embodiment of the forming fabric according to the invention, the position of the cutting plane through the fabric in FIG. 3 corresponding to that in FIG. 2.
  • the upper fabric 30 of the paper machine screen according to FIG. 3 and the lower layer of the two-layer U lower fabric 40 do not differ from the fabric described first.
  • the upper fabric has a very uniform 1 ⁇ 1 weave with chain 31 and weft 3.2, while a strong weft thread 42 that wears out is interwoven with the warp threads 41 of the lower fabric lying very close together, that a very wear-resistant weft rotor is created.
  • the weft 43 of the upper layer of the lower fabric 40 is not connected to the upper fabric 30.
  • the bond between the two-ply lower fabric 40 and the upper fabric 30 is produced by a separate weft 44, which is interwoven with individual warp threads of the upper fabric and warp threads 41 of the lower fabric 40 at those locations where the latter are bent over the weft thread 43 of the upper layer of the lower fabric .

Abstract

1. Two-layered forming screen, comprising an upper fabric and a lower fabric, for the wet end of a paper machine, characterized in that the warp density of the lower fabric (20; 40) is greater than 8.

Description

Die Erfindung betrifft ein zweilagiges, aus Obergewebe und Untergewebe bestehendes Formiersieb für die NaBpartei einer Papiermaschine.The invention relates to a two-layer forming fabric consisting of upper fabric and lower fabric for the wet party of a paper machine.

Papiermachergewebe dieser Art haben als Verschleißgewebe stets ein einlagiges Untergewebe, das in der Praxis gewöhnlich in einfacher Bindung oder in Kreuzköperbindung gewoben ist. Ein solches Verschleißgewebe kann nicht beliebig grob gemacht werden, weil sich sonst seine Struktur auf der Formierseite des Obergewebes abzeichnet und damit zu Markierungen im Papier führt. Damit sind aber der Stabilität solcher Siebe und ihrer Lebensdauer Grenzen gesetzt.Papermaker's fabrics of this type always have a single-layer bottom fabric as wear fabric, which in practice is usually woven in a single weave or in cross-twill weave. Such a wear fabric cannot be made arbitrarily rough, because otherwise its structure will appear on the forming side of the upper fabric and thus lead to markings in the paper. However, this limits the stability of such screens and their service life.

Der Erfindung liegt die Aufgabe zugrunde, ein Sieb eingangs genannter Art, dessen Blattbildungsseite aus einem möglichst einfachen, nicht markierenden Gewebe aus feinem Garn besteht, während das Gewebe auf der Laufseite verschleißfest und von hoher Längs- und Querstabilität sein und zu dem Zweck aus groben Fäden bestehen soll, so auszubilden, daß sich das grobe Untergewebe nicht auf der Blattbildungsseite abzeichnet. Ferner sollen Entwässerungsimpulse im Gewebe stark gedämpft werden.The invention has for its object a screen of the type mentioned, the sheet formation side consists of a simple, non-marking fabric made of fine yarn, while the fabric on the running side be wear-resistant and of high longitudinal and transverse stability and for the purpose of coarse threads should exist so that the coarse sub-fabric does not appear on the sheet formation side. Furthermore, drainage impulses in the tissue are to be strongly dampened.

Die Lösung dieser Aufgabe erfolgt in der Weise, daß die Kettdichte des Untergewebes größer als 8 ist. Die Kettdichte errechnet sich aus dem Durchmesser des Kettfadens und der Anzahl der Kettfäden pro Zentimer, multipliziert mit dem Faktor 10.This object is achieved in such a way that the warp density of the lower fabric is greater than 8. The warp density is calculated from the diameter of the warp thread and the number of warp threads per centimeter, multiplied by a factor of 10.

Eine besonders bevorzugte Ausgestaltung des erfindungsgemäßen Formiersiebs wird erhalten, wenn das Untergewebe in einer mehrlagigen Bindung gewebt ist, womit eine außergewöhnlich hohe Längs- und Querstabilität, wie sie bisher nur von Metallsieben erreicht wird, erhalten wird. Die hohe Kettdichte von mehr als 8 des Verschleißgewebes führt überdies bei ausreichender Entwässerungsleistung zu sehr hohen Retentionswerten, und das hohe Volumen des Verschleißgewebes bietet den weiteren Vorteil, daß die Entwässerungsimpulse stark gedämpft werden und so Papiere von so hoher Qualität erzeugt werden können, wie dies bisher nicht möglich war.A particularly preferred embodiment of the forming fabric according to the invention is obtained when the lower fabric is woven in a multi-layer weave, with which an exceptionally high longitudinal and transverse stability, as has hitherto only been achieved by metal fabrics, is obtained. The high warp density of more than 8 of the wear fabric also leads to very high retention values with sufficient drainage performance, and the high volume of the wear fabric offers the further advantage that the drainage impulses are strongly damped and paper of the same high quality can be produced as before was not possible.

Durch die Vielfalt von Möglichkeiten, die ein mehrlagiges Untergewebe bietet, lassen sich in das Untergewebe in fast beliebiger Weise spezielle Anbindepunkte oder -zonen einweben, die entweder direkt oder mit einem separaten Bindefaden, welcher in Schuß- oder Kettrichtung verlaufen kann, mit dem das Formiergewebe bildenden Obergewebe verbunden sind. Die bisher sich störend vielfach im Formiergewebe bemerkbar machenden Bindestellen können auf diese Weise minimiert werden. In einer besonders vorteilhaften, markierungsarmen Ausführung wird das Untergewebe mit einem Teil seiner Querfäden aus seiner oberen Lage an das Obergewebe angebunden.Due to the variety of possibilities offered by a multi-layer sub-fabric, special attachment points or zones can be woven into the sub-fabric in almost any way, either directly or with a separate binding thread, which can run in the weft or warp direction with which the forming fabric forming upper tissues are connected. In this way, the binding points that have so far been disruptive in the forming fabric can be minimized. In a particularly advantageous, low-marking version, the lower fabric is connected to the upper fabric with part of its transverse threads from its upper layer.

Zur näheren Erläuterung der Erfindung werden anhand der Zeichnung zwei Ausführungsbeispiele erläutert. Die Zeichnung zeigt im einzelnen in

  • Fig. 1 einen in Richtung der Kettfäden verlaufenden Vertikalschnitt durch einen Abschnitt eines erfindungsgemäßen Formiersiebes,
  • Fig. 2 einen Vertikalschnitt durch das Gewebe der Fig. 1 in einer zu den Schußfäden parallel verlaufenden Vertikalebene und
  • Fig. 3 einen parallel zu den Schußfäden verlaufenden Vertikalschnitt durch ein weiteres Formiergewebe gemäß der Erfindung.
For a more detailed explanation of the invention, two exemplary embodiments are explained with reference to the drawing. The drawing shows in detail in
  • 1 shows a vertical section through a section of a forming fabric according to the invention, running in the direction of the warp threads,
  • Fig. 2 shows a vertical section through the fabric of Fig. 1 in a vertical plane parallel to the weft threads and
  • Fig. 3 is a vertical section parallel to the weft threads through a further forming fabric according to the invention.

Ein in 1 x 1-Bindung gewebtes Obergewebe 10 aus relativ feinen Kettfäden 11 und Schußfäden 12 ist mit einem Untergewebe 20 verbunden, das zweilagig gewebt ist, wobei sein Kettfaden 21 mit einem starken, den Verschleiß tragenden unteren Schußfaden 22 und einem in der Oberlage des Untergewebes 20 liegenden, dünneren Schußfaden 23 verwebt ist. Die Bindung des zweilagigen Untergewebes 20 ist so gewählt, daß das Papiermaschinensieb als Schußläufer ausgebildet ist und eine sehr stabile Verschleißseite besitzt.A 1 x 1 weave upper fabric 10 made of relatively fine warp threads 11 and weft threads 12 is connected to a lower fabric 20 which is woven in two layers, its warp thread 21 with a strong, wear-bearing lower weft thread 22 and one in the top layer of the Underlying 20 lying, thinner weft 23 is woven. The binding of the two-ply lower fabric 20 is selected so that the paper machine screen is designed as a weft runner and has a very stable wear side.

Aus den Figuren 1 und 2 ist ersichtlich, daß Ober- und Untergewebe 10, 20 mit Hilfe einzelner Schußfäden 23 der oberen Lage des Untergewebes 20, die in größeren Abständen mit einzelnen Kettfäden 11 des Obergewebes verwoben sind, miteinander verbunden sind. Die Bindepunkte lassen sichderart anordnen, daß sie sich im Papier praktisch nicht abzeichnen.It can be seen from FIGS. 1 and 2 that the upper and lower fabrics 10, 20 are connected to one another with the aid of individual weft threads 23 of the upper layer of the lower fabric 20, which are interwoven at greater distances with individual warp threads 11 of the upper fabric. The binding points can be arranged in such a way that they practically do not appear on the paper.

Die Figuren 1 und 2 lassen überdies erkennen, daß das Untergewebe 20 eine hohe Kettdichte besitzt (Fig. 2) und diese Tatsache in Verbindung mit dem hohen Volumen zu einer starken Dämpfung der Entwässerungsimpulse und damit zu hoher Papierqualität führt.Figures 1 and 2 also show that the lower fabric 20 has a high warp density (Fig. 2) and this fact in connection with the high volume leads to a strong damping of the drainage impulses and thus to high paper quality.

In der Figur 3 ist ein weiteres Ausführungsbeispiel des erfindungsgemäßen Formiersiebes dargestellt, wobei die Lage der Schnittebene durch das Gewebe in der Figur 3 derjenigen nach Figur 2 entspricht. Das Obergewebe 30 des Papiermaschinensiebes nach Fig. 3 und die untere Lage des zweilagigen Untergewebes 40 unterscheiden sich dabei nicht von dem erstbeschriebenen Gewebe. Auch hier weist das Obergewebe eine sehr gleichmäßige 1 x 1-Bindung mit Kette 31 und Schuß 3.2 auf, während ein starker, den Verschleiß tragender Schußfaden 42 mit den sehr dicht liegenden Kettfäden 41 des Untergewebes derart verwoben ist, daß ein sehr verschleißfester Schußläufer entsteht.FIG. 3 shows a further exemplary embodiment of the forming fabric according to the invention, the position of the cutting plane through the fabric in FIG. 3 corresponding to that in FIG. 2. The upper fabric 30 of the paper machine screen according to FIG. 3 and the lower layer of the two-layer U lower fabric 40 do not differ from the fabric described first. Here, too, the upper fabric has a very uniform 1 × 1 weave with chain 31 and weft 3.2, while a strong weft thread 42 that wears out is interwoven with the warp threads 41 of the lower fabric lying very close together, that a very wear-resistant weft rotor is created.

Im vorliegenden Fall ist der Schußfaden 43 der Oberlage des Untergewebes 40 jedoch nicht mit dem Obergewebe 30 verbunden. Die Bindung zwischen dem zweilagigen Untergewebe 40 und dem Obergewebe 30 wird durch einen eigenen Bindeschuß 44 hergestellt, der mit einzelnen Kettfäden des Obergewebes und Kettfäden 41 des Untergewebes 40 an solchen Stellen verwoben ist, an denen letztere über den Schußfaden 43 der Oberlage des Untergewebes hinweggekröpft sind.In the present case, however, the weft 43 of the upper layer of the lower fabric 40 is not connected to the upper fabric 30. The bond between the two-ply lower fabric 40 and the upper fabric 30 is produced by a separate weft 44, which is interwoven with individual warp threads of the upper fabric and warp threads 41 of the lower fabric 40 at those locations where the latter are bent over the weft thread 43 of the upper layer of the lower fabric .

Claims (3)

1. Zweilagiges, aus Obergewebe und Untergewebe bestehendes Formiersieb für die Naßpartie einer Papiermaschine, dadurch gekennzeichnet, daß die Kettdichte des Untergewebes (20;40) größer als 8 ist.1. Two-layer forming fabric consisting of upper fabric and lower fabric for the wet end of a paper machine, characterized in that the warp density of the lower fabric (20; 40) is greater than 8. 2. Formiersieb nach Anspruch 1, dadurch gekennzeichnet, daß das Untergewebe (20;40) in einer mehrlagigen Bindung gewebt ist.2. forming fabric according to claim 1, characterized in that the lower fabric (20; 40) is woven in a multi-layer weave. 3. Formiersieb nach Anspruch 2, dadurch gekennzeichnet, daß Obergewebe (10) und Untergewebe (20) durch Querfäden (23) der oberen Lage des Untergewebes (20) als Bindefäden miteinander verwoben sind.3. forming fabric according to claim 2, characterized in that the upper fabric (10) and lower fabric (20) by cross threads (23) of the upper layer of the lower fabric (20) are woven together as binding threads.
EP84104291A 1983-05-25 1984-04-16 Multi-layered forming screen for the wet end of a paper machine Expired EP0126943B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84104291T ATE35705T1 (en) 1983-05-25 1984-04-16 MULTI-LAYER FORMING FABRIC FOR THE WET SECTION OF A PAPER MACHINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3318960 1983-05-25
DE19833318960 DE3318960A1 (en) 1983-05-25 1983-05-25 MULTI-LAYER FORMING SCREEN FOR THE WET SECTION OF A PAPER MACHINE

Publications (3)

Publication Number Publication Date
EP0126943A2 true EP0126943A2 (en) 1984-12-05
EP0126943A3 EP0126943A3 (en) 1985-06-19
EP0126943B1 EP0126943B1 (en) 1988-07-13

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ID=6199841

Family Applications (1)

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EP84104291A Expired EP0126943B1 (en) 1983-05-25 1984-04-16 Multi-layered forming screen for the wet end of a paper machine

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EP (1) EP0126943B1 (en)
AT (1) ATE35705T1 (en)
DE (2) DE3318960A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7581567B2 (en) 2006-04-28 2009-09-01 Weavexx Corporation Papermaker's forming fabric with cross-direction yarn stitching and ratio of top machine direction yarns to bottom machine direction yarns of 2:3
US20090183795A1 (en) 2008-01-23 2009-07-23 Kevin John Ward Multi-Layer Papermaker's Forming Fabric With Long Machine Side MD Floats
US7766053B2 (en) 2008-10-31 2010-08-03 Weavexx Corporation Multi-layer papermaker's forming fabric with alternating paired and single top CMD yarns
US8251103B2 (en) 2009-11-04 2012-08-28 Weavexx Corporation Papermaker's forming fabric with engineered drainage channels

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1994280A (en) * 1932-04-21 1935-03-12 Hindle Thomas Drier felt for use on paper making machines
US2047610A (en) * 1933-09-21 1936-07-14 William A Barrell Drier felt for paper machines and the like
US2854032A (en) * 1953-08-20 1958-09-30 William E Hooper And Sons Comp Dryer felt
US4314589A (en) * 1978-10-23 1982-02-09 Jwi Ltd. Duplex forming fabric
EP0097966A2 (en) * 1982-06-29 1984-01-11 Hermann Wangner GmbH & Co. KG Compound tissue for paper machines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1994280A (en) * 1932-04-21 1935-03-12 Hindle Thomas Drier felt for use on paper making machines
US2047610A (en) * 1933-09-21 1936-07-14 William A Barrell Drier felt for paper machines and the like
US2854032A (en) * 1953-08-20 1958-09-30 William E Hooper And Sons Comp Dryer felt
US4314589A (en) * 1978-10-23 1982-02-09 Jwi Ltd. Duplex forming fabric
EP0097966A2 (en) * 1982-06-29 1984-01-11 Hermann Wangner GmbH & Co. KG Compound tissue for paper machines

Also Published As

Publication number Publication date
ATE35705T1 (en) 1988-07-15
EP0126943A3 (en) 1985-06-19
DE3472693D1 (en) 1988-08-18
DE3318960A1 (en) 1984-11-29
EP0126943B1 (en) 1988-07-13

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