EP0185177B1 - Composite web for a paper-making machine sieve - Google Patents

Composite web for a paper-making machine sieve Download PDF

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Publication number
EP0185177B1
EP0185177B1 EP85113822A EP85113822A EP0185177B1 EP 0185177 B1 EP0185177 B1 EP 0185177B1 EP 85113822 A EP85113822 A EP 85113822A EP 85113822 A EP85113822 A EP 85113822A EP 0185177 B1 EP0185177 B1 EP 0185177B1
Authority
EP
European Patent Office
Prior art keywords
web
threads
binding
cross
composite
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
EP85113822A
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German (de)
French (fr)
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EP0185177A1 (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-Techni GmbH
Original Assignee
F Oberdorfer & Co KG Industriegewebe-Technik GmbH
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, F Oberdorfer & Co KG Industriegewebe-Technik GmbH filed Critical F Oberdorfer & Co KG Industriegewebe-Technik GmbH
Priority to AT85113822T priority Critical patent/ATE42120T1/en
Publication of EP0185177A1 publication Critical patent/EP0185177A1/en
Application granted granted Critical
Publication of EP0185177B1 publication Critical patent/EP0185177B1/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 composite fabric as a paper machine screen according to the preamble of claim 1. known from DE-A-3 318 990.
  • the object of the invention is therefore to design the composite fabric of the type mentioned in such a way that it has a new type of lower fabric, with the aid of which the above-mentioned disadvantages are eliminated.
  • the lower fabric contains two groups of transverse threads, the first of which are interwoven in 1: 1 weave and the second in 1: n weave with the warp threads of the lower fabric, that successive transverse threads of different types of weave, based on form double offsets on the inside of the lower fabric, touch, and that the long n offsets form a wear plane on the outside, where n means odd numbers greater than 1.
  • the weave of the lower fabric is therefore determined in such a way that some of the transverse threads are interwoven with the longitudinal threads in a 1: 1 offset ratio and the other part in a 1: n offset ratio, where n is the number of longitudinal threads that are on the running side, i.e. the outside, are spanned by the cranks of the 1: n cross threads. In this way, successive cross threads of different types of weave touch and form double offsets on the inside.
  • the bottom fabric of the composite screen according to the invention has 12 cross-bends 4, 5 on its inside. Since this bottom fabric can be designed in such a way that the longitudinal bends 6 and cross-bends 4, 5 of the inside lie almost in the same plane, without the runner characteristic of the barrel side being lost, the number of support points can be increased to 20. Practice shows, however, that 12 crossbends are sufficient as support points.
  • 5 and 6 show the running sides of two composite screens according to the invention. 5, the wear thread 7 spans five longitudinal threads. The cranks are distributed so that they form left and right diagonals at the same angle. This particularly stabilizes the straight running of the paper machine screen.
  • the transverse cranks 8 extending over three longitudinal threads are cross-shaped ver divides, achieving the same effect.
  • the number of 1: 1-bound cross threads is larger than that of 1: 3-bound cross threads.
  • FIG. 7 shows a complete composite sieve of the type according to the invention, consisting of a fine, simple upper fabric 9 and a coarse lower fabric 10 of the type shown in FIG.
  • the connection between the upper fabric and the lower fabric is established with binding weft threads 11. This binding technique is known per se.
  • FIGS. 8 and 9 The running side of the composite fabric according to the invention is shown in FIGS. 8 and 9, with FIG. 9 in particular showing the protrusion a of the wear threads over the longitudinal threads. It can be seen from this illustration that the wear cranks can wear completely without the longitudinal threads being attacked, as a result of which the desired long running times of the paper machine screen are achieved.
  • FIG. 10 shows a possibility of breaking the diagonal formed by the wear cranks by attaching a binding cartridge B with a Z diagonal to the binding cartridge A with an S diagonal.

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  • Paper (AREA)
  • Woven Fabrics (AREA)

Abstract

1. Composite web as paper-making machine fabric, consisting of a fine upper web having a simple binding and of a coarser lower web, characterized in that the lower web (10) is provided with two groups of cross threads, the first one of which is interweaved in 1:1 -binding and the second one of which is interweaved in 1:n -binding with warp threads of the lower wed, that the cross threads of different kind of binding following to one another contact each other forming on the inner surface of the lower wed double knuckles (5) and that the long n-nuckles (7) on the outer surface form an abrasive plain, wherein n means odd numbers greater than 1.

Description

Die Erfindung betrifft ein Verbundgewebe als Papiermaschinensieb gemäss dem Oberbegriff des Anspruchs 1. Ein solcher Sieb ist u.a. aus der DE-A-3 318 990 bekannt.The invention relates to a composite fabric as a paper machine screen according to the preamble of claim 1. known from DE-A-3 318 990.

In letzter Zeit wurden viele Versuche unternommen, Verbundgewebe als Papiermaschinensiebe einzusetzen, die jedoch grösstenteils erfolglos blieben. Das Versagen dieser Papiermaschinensiebe ist im wesentlichen auf die folgenden vier Ursachen zurückzuführen:

  • 1. Das feine Ober- oder Formiergewebe und das grobe Unter- oder Verschleissgewebe sind in ihrer Bindungsmechanik, beispielsweise was die Querkontraktion im Verhältnis zur Längsdehnung anbelangt, so verschieden, dass die Siebe nach kurzer Laufzeit in Falten laufen.
  • 2. Die unterschiedliche Querkontraktion verursacht hohe Spannungen in den Bindefäden, die nicht nur markierende Vertiefungen in der Sieboberfläche erzeugen, sondern in Verbindung mit den ständig im Betrieb auftretenden Lastwechseln die Bindefäden zerstören können.
  • 3. Einen wesentlichen Einfluss auf das Markierungsverhalten des Formiergewebes, also des Obergewebes, hat die Innenseite des Verschleissgewebes, also des Untergewebes. Die bisher verwendeten Untergewebe haben auf ihrer Innenseite zu wenig Tragepunkte, auf denen sich das Formiergewebe abstützen kann. Dieses sackt wegen der relativ grossen Abstände zwischen den Tragepunkten durch und bildet ein Muster von Vertiefungen bzw. Erhöhungen, die sich zu den Bindepunkt-Vertiefungen addieren und dadurch im Papier starke Markierungen erzeugen.
  • 4. Die Laufzeiten solcher Verbundsiebe sind deutlich geringer als die Laufzeiten vergleichbarer doppellagiger Siebe, deren Herstellung im übrigen weniger aufwendig ist.
Many attempts have recently been made to use composite fabrics as paper machine screens, but these have largely been unsuccessful. The failure of these paper machine screens is essentially due to the following four causes:
  • 1. The fine top or forming fabric and the coarse bottom or wear fabric are so different in their binding mechanics, for example as far as the transverse contraction in relation to the longitudinal expansion is concerned, that the screens run into folds after a short period of time.
  • 2. The different transverse contraction causes high tensions in the binding threads, which not only produce marking depressions in the surface of the sieve, but can also destroy the binding threads in connection with the load changes that occur constantly during operation.
  • 3. The inside of the wearing fabric, that is to say the lower fabric, has a significant influence on the marking behavior of the forming fabric, that is to say the upper fabric. The inner fabric used up to now has too few support points on which the forming fabric can be supported. This sags due to the relatively large distances between the support points and forms a pattern of depressions or elevations which add to the binding point depressions and thereby produce strong markings in the paper.
  • 4. The running times of such composite sieves are significantly shorter than the running times of comparable double-layer sieves, the manufacture of which is otherwise less complex.

Die Aufgabe der Erfindung besteht deshalb darin, das Verbundgewebe der genannten Art so auszubilden, dass es ein neuartiges Untergewebe aufweist, mit dessen Hilfe die obengenannten Nachteile beseitigt werden.The object of the invention is therefore to design the composite fabric of the type mentioned in such a way that it has a new type of lower fabric, with the aid of which the above-mentioned disadvantages are eliminated.

Zu diesem Zweck wird erfindungsgemäss vorgeschlagen, dass das Untergewebe zwei Gruppen von Querfäden enthält, deren erste in 1:1-Bindung und deren zweite in 1:n-Bindung mit den Kettfäden des Untergewebes verwoben sind, dass sich aufeinanderfolgende Querfäden unterschiedlicher Bindungsart, die auf der Innenseite des Untergewebes Doppelkröpfungen bilden, berühren, und dass die langen n-Kröpfungen auf der Aussenseite eine Verschleissebene bilden, wobei n ungerade Zahlen grösser als 1 bedeutet.For this purpose, it is proposed according to the invention that the lower fabric contains two groups of transverse threads, the first of which are interwoven in 1: 1 weave and the second in 1: n weave with the warp threads of the lower fabric, that successive transverse threads of different types of weave, based on form double offsets on the inside of the lower fabric, touch, and that the long n offsets form a wear plane on the outside, where n means odd numbers greater than 1.

Die Bindung des Untergewebes ist demnach so festgelegt, dass ein Teil der Querfäden mit den Längsfäden im Kröpfungsverhältnis 1:1 und der andere Teil im Kröpfungsverhältnis 1 :n verwoben ist, wobei n die Anzahl der Längsfäden bedeutet, die auf der Laufseite, d.h. der Aussenseite, von den Kröpfungen der 1:n-Querfäden überspannt werden. Auf diese Weise berühren sich aufeinanderfolgende Querfäden unterschiedlicher Bindungsart und bilden auf der Innenseite Doppelkröpfungen.The weave of the lower fabric is therefore determined in such a way that some of the transverse threads are interwoven with the longitudinal threads in a 1: 1 offset ratio and the other part in a 1: n offset ratio, where n is the number of longitudinal threads that are on the running side, i.e. the outside, are spanned by the cranks of the 1: n cross threads. In this way, successive cross threads of different types of weave touch and form double offsets on the inside.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous embodiments of the invention are characterized in the subclaims.

Die Erfindung wird nachfolgend anhand von in der Zeichnung dargestellten Ausführungsbeispielen nähererläutert. In der Zeichnung zeigen:

  • Figur 1, 2 und 3 eine Draufsicht von Innenseiten der Untergewebe von bekannten Verbundsieben,
  • Figur 4 eine Draufsicht der Innenseite des erfindungsgemässen Untergewebes,
  • Figur 5 und 6 Draufsichten der Aussenseite (Laufseite) erfindungsgemässer Verbundsiebe,
  • Figur 7 eine Draufsicht auf ein vollständiges Verbundsieb aus Ober- und Untergewebe, wobei das feinere Obergewebe nur teilweise dargestellt ist,
  • Figur 8 eine räumliche Darstellung der Laufseite des Untergewebes,
  • Figur 9 eine schematische Darstellung des Verlaufs der Verschleissfäden über den Längsfäden, und
  • Figur 10 zwei Bindungspatronen des erfindungsgemässen Gewebes.
The invention is explained in more detail below with reference to exemplary embodiments shown in the drawing. The drawing shows:
  • FIGS. 1, 2 and 3 show a top view from the inside of the lower fabrics of known composite screens,
  • FIG. 4 shows a top view of the inside of the lower fabric according to the invention,
  • 5 and 6 are top views of the outside (running side) of composite screens according to the invention,
  • FIG. 7 shows a plan view of a complete composite screen made of upper and lower fabrics, the finer upper fabric being shown only partially,
  • FIG. 8 shows a spatial representation of the running side of the lower fabric,
  • Figure 9 is a schematic representation of the course of the wear threads over the longitudinal threads, and
  • 10 shows two binding cartridges of the fabric according to the invention.

In den Fig. 1, 2 und 3 sind die Innenseiten der Untergewebe von bekannten Verbundsieben dargestellt; die dick gezeichneten Kröpfungen 1, 2 und 3 sind die Auflagepunkte für das Obergewebe. Da die Längsfäden dem Verschleiss nicht ausgesetzt werden sollen, da anderenfalls die Längsstabilität sehr schnell verloren geht, sind die Auflage-Kröpfungen in der Regel Querkröpfungen.1, 2 and 3, the inner sides of the lower fabric of known composite screens are shown; the bends 1, 2 and 3 are the support points for the upper fabric. Since the longitudinal threads should not be exposed to wear, since otherwise the longitudinal stability is lost very quickly, the overlaps are generally transverse crankings.

Fig. 4 zeigt die Innenseite des erfindungsgemässen Untergewebes. Da das Obergewebe des erfindungsgemässen Verbundsiebes ebenfalls eine einfache Bindung hat, lassen sich die Kontraktionswerte so aufeinander abstimmen, dass zwischen Ober- und Untergewebe keine nennenswerten Spannungen entstehen, und zwar unabhängig von der Schussläufereigenschaft der Verschleisseite des Untergewebes. Solche Verbundsiebe neigen deshalb nichts zur Faltenbildung. t 4 shows the inside of the lower fabric according to the invention. Since the upper fabric of the composite screen according to the invention also has a simple weave, the contraction values can be coordinated with one another in such a way that no significant stresses arise between the upper and lower fabrics, regardless of the weft properties of the wear side of the lower fabric. Such composite screens therefore have no tendency to wrinkle. t

Das Untergewebe des erfindungsgemässen Verbundsiebes hat auf seiner Innenseite 12 Querkröpfungen 4, 5. Da dieses Untergewebe so gestaltet werden kann, dass die Längskröpfungen 6 und Querkröpfungen 4, 5 der Innenseite nahezu in der gleichen Ebene liegen, ohne dass die Schussläufereigenschaft der Laufseite verloren geht, kann die Anzahl der Auflagepunkte auf 20 gesteigert werden. Die Praxis zeigt jedoch, dass 12 Querkröpfungen als Auflagepunkte ausreichen. In den Fig. 5 und 6 sind die Laufseiten zweier erfindungsgemässer Verbundsiebe dargestellt. Bei der Laufseite von Fig. 5 überspannt der Verschleissfaden 7 fünf Längsfäden. Die Kröpfungen sind so verteilt, dass sie Links- und Rechtsdiagonalen unter gleichem Winkel bilden. Dadurch wird insbesondere der Geradeauslauf des Papiermaschi:nensiebes stabilisiert.The bottom fabric of the composite screen according to the invention has 12 cross-bends 4, 5 on its inside. Since this bottom fabric can be designed in such a way that the longitudinal bends 6 and cross-bends 4, 5 of the inside lie almost in the same plane, without the runner characteristic of the barrel side being lost, the number of support points can be increased to 20. Practice shows, however, that 12 crossbends are sufficient as support points. 5 and 6 show the running sides of two composite screens according to the invention. 5, the wear thread 7 spans five longitudinal threads. The cranks are distributed so that they form left and right diagonals at the same angle. This particularly stabilizes the straight running of the paper machine screen.

In Fig. 6 sind die über drei Längsfäden verlaufenden Querkröpfungen 8 kreuzkörperartig verteilt, wodurch die gleiche Wirkung erzielt wird. Hierbei ist die Anzahl der 1:1-gebundenen Querfäden grösser als die der 1:3-gebundenen Querfäden.In Fig. 6, the transverse cranks 8 extending over three longitudinal threads are cross-shaped ver divides, achieving the same effect. The number of 1: 1-bound cross threads is larger than that of 1: 3-bound cross threads.

In Fig. 7 ist ein vollständiges Verbundsieb der erfindungsgemässen Art dargestellt, bestehend aus einem feinen, einfachen Obergewebe 9 und einem groben Untergewebe 10 der in Fig. 4 gezeigten Art. Zur Verdeutlichung des Aufbaus ist jedoch das Obergewebe nur zum Teil eingezeichnet. Die Verbindung zwischen Obergewebe und Untergewebe wird mit Bindeschussfäden 11 hergestellt, Diese Bindungstechnik ist an sich bekannt.FIG. 7 shows a complete composite sieve of the type according to the invention, consisting of a fine, simple upper fabric 9 and a coarse lower fabric 10 of the type shown in FIG. The connection between the upper fabric and the lower fabric is established with binding weft threads 11. This binding technique is known per se.

Die Laufseite des erfindungsgemässen Verbundgewebes ist in den Fig. 8 und 9 dargestellt, wobei insbesondere Fig. 9 den Überstand a der Verschleissfäden über die Längsfäden zeigt. Aus dieser Darstellung geht hervor, dass die Verschleisskröpfungen völlig verschleissen können, ohne das die Längsfäden angegriffen werden können, wodurch die angestrebten hohen Laufzeiten des Papiermaschinensiebes erreicht werden.The running side of the composite fabric according to the invention is shown in FIGS. 8 and 9, with FIG. 9 in particular showing the protrusion a of the wear threads over the longitudinal threads. It can be seen from this illustration that the wear cranks can wear completely without the longitudinal threads being attacked, as a result of which the desired long running times of the paper machine screen are achieved.

Fig. 10 zeigt eine Möglichkeit, die durch die Verschleisskröpfungen gebildete Diagonale dadurch zu brechen, dass der Bindungspatrone A mit einer S-Diagonalen eine Bindungspatrone B mit einer Z-Diagonalen angehängt wird.FIG. 10 shows a possibility of breaking the diagonal formed by the wear cranks by attaching a binding cartridge B with a Z diagonal to the binding cartridge A with an S diagonal.

Claims (6)

1. Composite web as paper-making machine fabric, consisting of a fine upper web having a simple binding and of a coarser lower web, characterized in that the lower web (10) is provided with two groups of cross threads, the first one of which is interweaved in 1:1-binding and the second one of which is interweaved in 1:n-binding with warp threads of the lower web, that the cross threads of different kind of binding following to one another contact each other forming on the inner surface of the lower web double knuckles (5) and that the long n-knuckles (7) on the outer surface form an abrasive plain, wherein n means odd numbers greater than 1.
2. Composite web according to claim 1, characterized in that the number of cross threads of the two groups of cross threads of the lower web (10) is the same.
3. Composite web according to claim 1, characterized in that the number of the 1:1-bound cross threads of the lower web is greater than the number of the 1:n- bound cross threads.
4. Composite web according to claim 1, characterized in that the 1:n-bound cross threads of the lower web (10) consist of a highly abrasive resistent material.
5. Composite web according to one of the claims 1 through 4, characterized in that the upper web (9) is interwoven with the lower web (10) by cross directed binding threads (11).
6. Composite web according to one of the claims 1 through 4, characterized in that the upper web (9) is interwoven with the lower web (10) by a binding thread system consisting of longitudinal directed and cross directed threads.
EP85113822A 1984-12-12 1985-10-30 Composite web for a paper-making machine sieve Expired EP0185177B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85113822T ATE42120T1 (en) 1984-12-12 1985-10-30 COMPOSITE FABRIC AS A PAPER MACHINE SCREEN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3445367 1984-12-12
DE3445367A DE3445367C1 (en) 1984-12-12 1984-12-12 Composite fabric as a paper machine screen

Publications (2)

Publication Number Publication Date
EP0185177A1 EP0185177A1 (en) 1986-06-25
EP0185177B1 true EP0185177B1 (en) 1989-04-12

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EP85113822A Expired EP0185177B1 (en) 1984-12-12 1985-10-30 Composite web for a paper-making machine sieve

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AT (1) ATE42120T1 (en)
DE (2) DE3445367C1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
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US7766053B2 (en) 2008-10-31 2010-08-03 Weavexx Corporation Multi-layer papermaker's forming fabric with alternating paired and single top CMD yarns
US7931051B2 (en) 2008-01-23 2011-04-26 Weavexx Corporation Multi-layer papermaker's forming fabric with long machine side MD floats
US8251103B2 (en) 2009-11-04 2012-08-28 Weavexx Corporation Papermaker's forming fabric with engineered drainage channels

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DE3635000A1 (en) * 1986-10-14 1988-04-21 Oberdorfer Fa F DOUBLE-LAYER PAPER MACHINE SCREEN WITH COARSE-TEXTURED RUNNING SIDE AND FINE-STRUCTURED PAPER SIDE
EP0293989A1 (en) * 1987-06-04 1988-12-07 Akzo N.V. Filtertestproof conveyor belt comprising aramid
DE3801051A1 (en) * 1988-01-15 1989-07-27 Wangner Gmbh Co Kg Hermann DOUBLE-DAY LOADING FOR THE SHEETING AREA OF A PAPER MACHINE
CA1320410C (en) * 1988-06-27 1993-07-20 Takuo Tate Papermakers' double layer type fabrics
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US5709250A (en) * 1994-09-16 1998-01-20 Weavexx Corporation Papermakers' forming fabric having additional fiber support yarns
US5518042A (en) * 1994-09-16 1996-05-21 Huyck Licensco, Inc. Papermaker's forming fabric with additional cross machine direction locator and fiber supporting yarns
US5983953A (en) * 1994-09-16 1999-11-16 Weavexx Corporation Paper forming progess
US5937914A (en) * 1997-02-20 1999-08-17 Weavexx Corporation Papermaker's fabric with auxiliary yarns
US5967195A (en) * 1997-08-01 1999-10-19 Weavexx Corporation Multi-layer forming fabric with stitching yarn pairs integrated into papermaking surface
US6112774A (en) * 1998-06-02 2000-09-05 Weavexx Corporation Double layer papermaker's forming fabric with reduced twinning.
US6179013B1 (en) 1999-10-21 2001-01-30 Weavexx Corporation Low caliper multi-layer forming fabrics with machine side cross machine direction yarns having a flattened cross section
US6123116A (en) * 1999-10-21 2000-09-26 Weavexx Corporation Low caliper mechanically stable multi-layer papermaker's fabrics with paired machine side cross machine direction yarns
US6585006B1 (en) 2000-02-10 2003-07-01 Weavexx Corporation Papermaker's forming fabric with companion yarns
US6244306B1 (en) 2000-05-26 2001-06-12 Weavexx Corporation Papermaker's forming fabric
US6253796B1 (en) 2000-07-28 2001-07-03 Weavexx Corporation Papermaker's forming fabric
US6745797B2 (en) 2001-06-21 2004-06-08 Weavexx Corporation Papermaker's forming fabric
US6837277B2 (en) 2003-01-30 2005-01-04 Weavexx Corporation Papermaker's forming fabric
CN107164990A (en) * 2017-06-19 2017-09-15 太仓市宇航造纸机械厂 A kind of paper machine lining cloth

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7931051B2 (en) 2008-01-23 2011-04-26 Weavexx Corporation 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

Also Published As

Publication number Publication date
ATE42120T1 (en) 1989-04-15
DE3569397D1 (en) 1989-05-18
DE3445367C1 (en) 1986-08-14
EP0185177A1 (en) 1986-06-25

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