EP0290653B1 - Material web - Google Patents

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Publication number
EP0290653B1
EP0290653B1 EP87106979A EP87106979A EP0290653B1 EP 0290653 B1 EP0290653 B1 EP 0290653B1 EP 87106979 A EP87106979 A EP 87106979A EP 87106979 A EP87106979 A EP 87106979A EP 0290653 B1 EP0290653 B1 EP 0290653B1
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EP
European Patent Office
Prior art keywords
threads
web
material according
thread
knitted
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 - Lifetime
Application number
EP87106979A
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German (de)
French (fr)
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EP0290653A1 (en
Inventor
Helmut Hälker
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.)
Heimbach GmbH and Co KG
Original Assignee
Thomas Josef Heimbach and Co 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
Priority to ES87106979T priority Critical patent/ES2015284B3/en
Application filed by Thomas Josef Heimbach and Co GmbH filed Critical Thomas Josef Heimbach and Co GmbH
Priority to EP87106979A priority patent/EP0290653B1/en
Priority to DE8787106979T priority patent/DE3762246D1/en
Priority to AT87106979T priority patent/ATE51907T1/en
Priority to CA000566454A priority patent/CA1322121C/en
Priority to US07/193,595 priority patent/US4948658A/en
Priority to FI882245A priority patent/FI89818C/en
Publication of EP0290653A1 publication Critical patent/EP0290653A1/en
Application granted granted Critical
Publication of EP0290653B1 publication Critical patent/EP0290653B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/061—Cushion plates
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
    • D04B21/16—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes incorporating synthetic threads
    • 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
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2403/00—Details of fabric structure established in the fabric forming process
    • D10B2403/02—Cross-sectional features
    • D10B2403/024—Fabric incorporating additional compounds
    • D10B2403/0241—Fabric incorporating additional compounds enhancing mechanical properties
    • D10B2403/02412—Fabric incorporating additional compounds enhancing mechanical properties including several arrays of unbent yarn, e.g. multiaxial fabrics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/40—Knit fabric [i.e., knit strand or strip material]
    • Y10T442/45—Knit fabric is characterized by a particular or differential knit pattern other than open knit fabric or a fabric in which the strand denier is specified
    • Y10T442/456—Including additional strand inserted within knit fabric
    • Y10T442/463—Warp knit insert strand
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/50—FELT FABRIC
    • Y10T442/56—From synthetic organic fiber

Definitions

  • the invention relates to a material web, in particular for paper machine clothing for the press section of a paper machine, as a filter medium or as a press pad for the chipboard presses, with knitting threads extending in one direction, each of which envelops a core thread, and with binding threads running at right angles thereto. Furthermore, the invention relates to a method for producing this material web, in which mesh threads are produced with core threads covered by them and, after alignment, are connected with binding threads in a parallel, parallel position.
  • a paper machine clothing in which unidirectional mesh threads are used. These mesh threads can contain soul threads made of different materials.
  • the stitch threads are interwoven with weft threads running in the transverse direction, i.e. the weft threads are passed around the stitch threads.
  • the description also assumes a fabric structure for the paper machine clothing.
  • the stitch threads are produced individually on a knitting machine and then woven in a weaving machine with the weft threads, optionally with further warp threads.
  • a corresponding paper machine clothing is described in EP-A 0 059 973.
  • This wet felt also has a woven fabric in which some warp threads extending in the longitudinal direction are formed as knitted threads. These threads are elastically compressible and are intended to improve back elasticity and drainage.
  • machine felts are known, for example for filtering purposes, which consist of voluminous threads running parallel in the transverse direction and tricot seams extending parallel and in the longitudinal direction parallel to one another (DE-A 2 213 421).
  • the cross threads go through the mesh of the tricot seams and the material thus formed is then needled for the purpose of felting.
  • the transverse threads essentially form the filter-effective fiber material, while the tricot seams give a certain strength in the longitudinal direction.
  • weft threads are provided which link the tricot seams to one another in the transverse direction.
  • the invention has for its object to give a material web of the type mentioned in such a structure that it is quick and inexpensive to manufacture, and to provide a method that allows such a production.
  • the first-mentioned object is achieved according to the invention in that the binding threads in the form of a magazine weft pass straight through the stitch threads.
  • This structure of a material web allows, despite the more fabric-like design, the quick and inexpensive production on a knitting machine according to the method according to the invention, in which all stitch threads are produced simultaneously and at the desired distance next to one another by continuous stitch formation with simultaneous feeding of the soul thread and subsequently a magazine weft through the stitch threads is driven.
  • For the production of the material web only a correspondingly wide knitting machine with magazine weft device is required.
  • the set-up time for this knitting machine is very short compared to weaving machines and the production speed is also much higher.
  • the soul threads can be optimally adapted to the respective requirements, whereby different materials can be combined with each other.
  • the soul thread is held together by the stitch thread in such a way that twisting of the individual yarns of the thread is not necessary. It is sufficient if it is available as a bundle of threads. It is therefore also possible to use or combine yarn materials that cannot be twisted together. By saving the twisting mill there is an additional cost saving effect.
  • the covering has a pronounced longitudinal structure in the direction of the threads formed from mesh and core threads.
  • this web of material is used as paper machine clothing and this structure runs in the longitudinal direction of the paper machine clothing, this creates a drainage effect in this direction.
  • a drainage effect is extremely desirable and leads to a high drainage of the paper web.
  • the mesh threads expediently consist of a thin monofilament, since they only have to absorb tensile forces to a small extent.
  • the tensile forces are expediently taken over by the tension threads forming the soul threads or existing as part of the soul threads.
  • filler threads made from a wide variety of materials can then be inserted to give the soul threads the desired volume. For example, spun yarns, multifilaments, foam rolls, ribbon structures or even mineral fibers, straw, paper, and electrically conductive materials such as metal fibers or the like can be inserted. If a tension thread is present, the tensile strength of the filler threads is no longer important, so that yarn or thread material that is only able to absorb low tensile forces can also be used.
  • the magazine shots all run on one side of the soul threads, and expediently on the back.
  • the paper contact side is formed only by the threads which are formed from the combination of mesh and core threads. Accordingly, a distinctive longitudinal structure with a good drainage effect is also created on this side.
  • the material web is designed as a needle felt. This can be done by forming the soul threads from voluminous fiber material, which is needled for the purpose of felting.
  • a nonwoven fabric can also be applied to at least one side of the covering and connected to the scrim by needling.
  • a needle felt is particularly suitable as a filter medium, but also as a paper machine covering, in particular as a wet felt for the press section.
  • the material web in a liquid-impermeable plastic band in order to use such a band in wet presses with an extended press nip (cf. EP-A3-0 138 797, DE-A1-32 31 039).
  • the material web is only partially embedded in a liquid-impermeable plastic band and protrudes on one side of the plastic web with the formation of open channels for liquid removal (cf. EP-A2-0 098 502, DE-A1- 32 35 468).
  • the web of material according to the invention can thus be used in a variety of ways.
  • the longitudinal thread (1) shown in Figures (1) and (2) basically consists of a core thread (2) and a warp-knitted stitch thread (3) surrounding the core thread (2).
  • the soul thread (2) forms - as Figure (2) in particular shows - a bundle of threads from a total of six individual threads (4, 5, 6, 7, 8, 9).
  • Two (4, 8) of these individual threads are formed as monofilaments from a tensile material, for example polyamide, and essentially absorb the tensile stresses acting on the longitudinal thread (1).
  • the remaining individual threads (5, 6, 7, 9) can consist of a wide variety of materials, since they are relieved of tensile force by the monofilament individual threads (4, 8).
  • the bundle of threads is not twisted together because it is enveloped by the stitch thread (3) and held together.
  • Figure (3) shows a section of a paper machine clothing, which has been produced using the longitudinal threads (1) shown in Figures (1) and (2).
  • the longitudinal threads (1) run parallel in the running direction of the paper machine clothing.
  • the thread density is relatively low, for example three threads / cm.
  • machine wefts run through the mesh threads at regular intervals - denoted by (10) for example -. They each cross through the stitches of the stitch threads (3) and lie on the underside of the soul threads (2).
  • Their distance from one another can be varied by the number of stitches per unit length and by the fact that a machine weft (10) is not placed through each stitch.
  • the stitch density can be 6 to 9 stitches / cm and the magazine weft density can be 3 threads / cm.
  • other values can also be considered.
  • the section shown in Figure (3) shows only one layer of the paper machine clothing. It is possible to lay several such layers on top of each other and to connect them with needle felting. If the seams of the individual layers are staggered, a special seam connection can be dispensed with.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Paper (AREA)
  • Woven Fabrics (AREA)
  • Materials For Medical Uses (AREA)
  • Inert Electrodes (AREA)
  • Insulated Conductors (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Escalators And Moving Walkways (AREA)

Abstract

1. Web of material, in particular for clothing the press section of a papermaking machine or for use as a filter medium or as a press pad for chipboard presses, formed of knitted threads (3) extending in one direction, each of which encircles a core thread (2), and of binding threads, extending at right angles thereto, characterized in that the binding threads pass in the form of a magazine weft (10) straight through the knitted threads (3).

Description

Die Erfindung betrifft eine Materialbahn, insbesondere für Papiermaschinenbespannungen für die Pressenpartie einer Papiermaschine, als Filtermittel oder als Preßpolster für die Spanplattenpressen, mit sich in einer Richtung erstreckenden Maschenfäden, die jeweils einen Seelenfaden umhüllen, und mit rechtwinklig dazu verlaufenden Bindefäden. Ferner bezieht sich die Erfindung auf ein Verfahren zur Herstellung dieser Materialbahn, bei dem Maschenfäden mit von ihnen umhüllten Seelenfäden hergestellt und nach Ausrichtung in nebeneinander paralleler Lage mit Bindefäden verbunden werden.The invention relates to a material web, in particular for paper machine clothing for the press section of a paper machine, as a filter medium or as a press pad for the chipboard presses, with knitting threads extending in one direction, each of which envelops a core thread, and with binding threads running at right angles thereto. Furthermore, the invention relates to a method for producing this material web, in which mesh threads are produced with core threads covered by them and, after alignment, are connected with binding threads in a parallel, parallel position.

Eine derartige Materialbahn und ein derartiges Verfahren zur Herstellung dieser Materialbahn ist aus der EP-A 0 106 132 bekannt.Such a material web and such a method for producing this material web is known from EP-A 0 106 132.

In dieser Entgegenhaltung ist eine Papiermaschinenbespannung offenbart, bei der in einer Richtung verlaufende Maschenfäden verwendet werden. Diese Maschenfäden können Seelenfäden aus verschiedenen Materialien enthalten. Nach dem in Figur (3) dargestellten Ausführungsbeispiel sind die Maschenfäden mit in Querrichtung verlaufenden Schußfäden verwebt, d.h. die Schußfäden werden um die Maschenfäden herumgeführt. Auch in der Beschreibung wird grundsätzlich von einer Gewebestruktur der Papiermaschinenbespannung ausgegangen. Die Maschenfäden werden einzeln auf einer Wirkmaschine hergestellt und dann in einer Webmaschine mit den Schußfäden, gegebenenfalls mit weiteren Kettfäden, verwebt.In this document a paper machine clothing is disclosed in which unidirectional mesh threads are used. These mesh threads can contain soul threads made of different materials. According to the embodiment shown in Figure (3), the stitch threads are interwoven with weft threads running in the transverse direction, i.e. the weft threads are passed around the stitch threads. The description also assumes a fabric structure for the paper machine clothing. The stitch threads are produced individually on a knitting machine and then woven in a weaving machine with the weft threads, optionally with further warp threads.

Eine entsprechende Papiermaschinenbespannung ist in der EP-A 0 059 973 beschrieben. Auch bei diesem Naßfilz liegt ein Gewebe vor, bei dem einige sich in Längsrichtung erstreckende Kettfäden als gestrickte Fäden ausgebildet sind. Diese Fäden sind elastisch komprimierbar und sollen auf diese Weise die Rückelastizität und die Entwässerung verbessern.A corresponding paper machine clothing is described in EP-A 0 059 973. This wet felt also has a woven fabric in which some warp threads extending in the longitudinal direction are formed as knitted threads. These threads are elastically compressible and are intended to improve back elasticity and drainage.

Die in den vorgenannten Veröffentlichungen beschriebenen Papiermaschinenbespannungen werden sämtlich auf konventionelle Weise, d. h. durch Weben hergestellt. Vor allem wenn diese Bespannungen sehr breit ausgeführt werden sollen, ist diese Art der Herstellung zeit- und damit kostenaufwendig.The paper machine clothing described in the aforementioned publications are all made in a conventional manner, i. H. made by weaving. Especially if these coverings are to be made very broad, this type of production is time-consuming and therefore costly.

Daneben ist versucht worden, Papiermaschinenbespannungen aus einer Kettenwirkware herzustellen, wie sich der DE-A 2 436 293 entnehmen läßt. Bei einem solchen Kettengewirk sind die einzelnen Längsfäden in Querrichtung miteinander vermascht, d.h. für ihre Einbindung in dieser Richtung sind grundsätzlich keine Querfäden vorgesehen. Allerdings wird zur Unterstützung der Strukturbeständigkeit der Kettenwirkware vorgeschlagen, in Kett- und/oder Schußrichtung zusätzlich Garne einzulegen. Obwohl man sich durch die Verwendung einer Kettenwirkware als Trägerstruktur Kostenvorteile versprechen konnte, sind bisher solche Papiermaschinenbespannungen nicht zum Einsatz gekommen.In addition, attempts have been made to produce paper machine clothing from warp knitted fabrics, as can be seen in DE-A 2 436 293. In such a warp knitted fabric, the individual longitudinal threads are knitted together in the transverse direction, i.e. in principle, no transverse threads are provided for their integration in this direction. However, in order to support the structural stability of the warp knitted fabric, it is proposed to additionally insert yarns in the warp and / or weft direction. Although cost advantages could be expected from the use of warp knitted fabrics as a support structure, such paper machine clothing has not been used to date.

Schließlich sind Maschinenfilze, beispielsweise für Filtrierzwecke, bekannt, die aus in Querrichtung parallel verlaufenden, voluminösen Fäden und sich in Längsrichtung parallel im Abstand zueinander erstreckenden Trikotnähten bestehen (DE-A 2 213 421). Dabei gehen die Querfäden durch die Maschen der Trikotnähte und wird das so gebildete Material anschließend zum Zwecke der Verfilzung genadelt. Die Querfäden bilden dabei im wesentli- .chen das filterwirksame Fasermaterial, während die Trikotnähte eine gewisse Festigkeit in Längsrichtung verleihen- Zusätzlich sind Einschlagfäden vorgesehen, die die Trikotnähte in Querrichtung miteinander verknüpft. Allerdings ist ein Maschinenfilz mit diesem Aufbau den hohen Beanspruchungen, denen Papiermaschinenbespannungen oder Preßpolster ausgesetzt sind, nicht gewachsen und deshalb für diesen Zweck ungeeignet.Finally, machine felts are known, for example for filtering purposes, which consist of voluminous threads running parallel in the transverse direction and tricot seams extending parallel and in the longitudinal direction parallel to one another (DE-A 2 213 421). The cross threads go through the mesh of the tricot seams and the material thus formed is then needled for the purpose of felting. The transverse threads essentially form the filter-effective fiber material, while the tricot seams give a certain strength in the longitudinal direction. In addition, weft threads are provided which link the tricot seams to one another in the transverse direction. However, a machine felt with this structure cannot withstand the high stresses to which paper machine clothing or press pads are exposed and is therefore unsuitable for this purpose.

Der Erfindung liegt die Aufgabe zugrunde, einer Materialbahn der eingangs genannten Art eine solche Struktur zu geben, daß sie schnell und kostengünstig herzustellen ist, sowie ein Verfahren bereitzustellen, das eine solche Herstellung erlaubt.The invention has for its object to give a material web of the type mentioned in such a structure that it is quick and inexpensive to manufacture, and to provide a method that allows such a production.

Die erstgenante Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Bindefäden in Form eines Magazinschusses gerade durch die Maschenfäden hindurchgehen.The first-mentioned object is achieved according to the invention in that the binding threads in the form of a magazine weft pass straight through the stitch threads.

Dieser Aufbau einer Materialbahn erlaubt trotz der eher gewebeähnlichen Ausbildung die schnelle und kostengünstige Herstellung auf einer Wirkmaschine nach dem erfindungsgemäßen Verfahren, bei dem sämtliche Maschenfäden gleichzeitig und im gewünschten Abstand nebeneinander durch fortlaufende Maschenbildung unter gleichzeitigem Zuführen des Seelenfadens erzeugt und unmitteibar anschließend ein Magazinschuß durch die Maschenfäden getrieben wird. Für die Herstellung der Materialbahn ist somit nur eine entsprechend breite Wirkmaschine mit Magazinschußeinrichtung erforderlich. Die Rüstzeit für diese Wirkmaschine ist im Vergleich zu Webmaschinen sehr gering und auch die Produktionsgeschwindigkeit ist wesentlich höher. Die Seelenfäden können optimal den jeweiligen Anforderungen angepaßt werden, wobei verschiedenste Materialien miteinander zu kombinieren sind. Durch den Maschenfaden wird der Seelenfaden derart zusammengehalten, daß eine Verzwirnung der einzelnen Garne des Fadens nicht notwendig ist. Es reicht aus, wenn er als Fadenbündel vorliegt. Es können deshalb auch Garnmaterialien verwendet bzw. kombiniert werden, die sich nicht miteinander verzwirnen lassen. Durch Einsparen der Zwirnerei entsteht ein zusätzlicher Kosteneinsparungseffekt.This structure of a material web allows, despite the more fabric-like design, the quick and inexpensive production on a knitting machine according to the method according to the invention, in which all stitch threads are produced simultaneously and at the desired distance next to one another by continuous stitch formation with simultaneous feeding of the soul thread and subsequently a magazine weft through the stitch threads is driven. For the production of the material web, only a correspondingly wide knitting machine with magazine weft device is required. The set-up time for this knitting machine is very short compared to weaving machines and the production speed is also much higher. The soul threads can be optimally adapted to the respective requirements, whereby different materials can be combined with each other. The soul thread is held together by the stitch thread in such a way that twisting of the individual yarns of the thread is not necessary. It is sufficient if it is available as a bundle of threads. It is therefore also possible to use or combine yarn materials that cannot be twisted together. By saving the twisting mill there is an additional cost saving effect.

Ein weiterer Vorteil der erfindungsgemäßen Materialbahn besteht darin, daß die Bespannung eine ausgeprägte Längsstruktur in Richtung der aus Maschen- und Seelenfaden gebildeten Fäden hat. Soweit diese Materialbahn als Papiermaschinenbespannung verwendet wird und diese Struktur in Längsrichtung der Papiermaschinenbespannung verläuft, entsteht hierdurch eine Drainagewirkung in dieser Richtung. Unter Berücksichtigung der neuesten Erkenntnisse über die Entwässerung im Pressenspalt zwischen zwei Preßwalzen ist eine solche Drainagewirkung außerordentlich erwünscht und führt zu einer hohen Entwässerung der Papierbahn.Another advantage of the material web according to the invention is that the covering has a pronounced longitudinal structure in the direction of the threads formed from mesh and core threads. Insofar as this web of material is used as paper machine clothing and this structure runs in the longitudinal direction of the paper machine clothing, this creates a drainage effect in this direction. Taking into account the latest knowledge about the drainage in the press nip between two press rolls, such a drainage effect is extremely desirable and leads to a high drainage of the paper web.

Die Maschenfäden bestehen zweckmäßigerweise aus einem dünnen Monofil, da sie Zugkräfte nur in geringem Maße aufnehmen müssen. Die Zugkräfte werden nämlich zweckmäßigerweise von die Seelenfäden bildenden oder als Teil der Seelenfäden vorhandenen Zugfäden übernommen. Daneben können dann noch Füllfäden aus den verschiedensten Materialien eingelegt werden, um den Seelenfäden das gewünschte Volumen zu geben. So können beispielsweise Spinnfasergarne, Multifilamente, Schaumstoffrollen, Bändchengebilde oder sogar Mineralfasern, Stroh, Papier, sowie elektrisch leitfähige Materialien wie Metallfasern oder dergleichen eingelegt werden. Soweit ein Zugfaden vorhanden ist, kommt es auf die Zugfestigkeit der Füllfäden nicht mehr an, so daß auch Garn- bzw. Fadenmaterial Verwendung finden kann, das nur geringe Zugkräfte aufzunehmen in der Lage ist.The mesh threads expediently consist of a thin monofilament, since they only have to absorb tensile forces to a small extent. The tensile forces are expediently taken over by the tension threads forming the soul threads or existing as part of the soul threads. In addition, filler threads made from a wide variety of materials can then be inserted to give the soul threads the desired volume. For example, spun yarns, multifilaments, foam rolls, ribbon structures or even mineral fibers, straw, paper, and electrically conductive materials such as metal fibers or the like can be inserted. If a tension thread is present, the tensile strength of the filler threads is no longer important, so that yarn or thread material that is only able to absorb low tensile forces can also be used.

Es empfiehlt sich, die Magazinschüsse sämtlich auf einer Seite der Seelenfäden verlaufen zu lassen, und zwar zweckmäßigerweise auf deren Rückseite. Die Papierberührungsseite wird in diesen Fällen nur von den Fäden gebildet, die aus der Kombination von Maschen- und Seelenfäden gebildet sind. Entsprechend entsteht auch auf dieser Seite eine ausgeprägte Längsstruktur mit gutem Drainageeffekt.It is recommended that the magazine shots all run on one side of the soul threads, and expediently on the back. In this case, the paper contact side is formed only by the threads which are formed from the combination of mesh and core threads. Accordingly, a distinctive longitudinal structure with a good drainage effect is also created on this side.

Für die in der anderen Richtung verlaufenden Fäden bieten sich Monofile, aber auch insbesondere dünne Multifile an, da letztere eine höhere Rutschfestigkeit haben und demgemäß für eine bessere Querstabilität der Längsfäden sorgen.For the threads running in the other direction, monofilaments, but also in particular thin multifiles, are suitable, since the latter have a higher slip resistance and accordingly ensure better transverse stability of the longitudinal threads.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß die Materialbahn als Nadelfilz ausgebildet ist. Dies kann dadurch geschehen, daß die Seelenfäden aus voluminösem Fasermaterial gebildet werden, das zum Zwecke der Verfilzung vernadelt wird. Es kann aber auch ein Faservlies auf zumindest einer Seite der Bespannung aufgebracht und durch Vernadelung mit dem Fadengelege verbunden werden. Ein solcher Nadelfilz ist insbesondere als Filtermittel, aber auch als Papiermaschinenbespannung, insbesondere als Naßfilz für die Pressenpartie, geeignet.In a further embodiment of the invention it is provided that the material web is designed as a needle felt. This can be done by forming the soul threads from voluminous fiber material, which is needled for the purpose of felting. However, a nonwoven fabric can also be applied to at least one side of the covering and connected to the scrim by needling. Such a needle felt is particularly suitable as a filter medium, but also as a paper machine covering, in particular as a wet felt for the press section.

Daneben besteht auch die Möglichkeit, die Materialbahn in ein flüssigkeitsundurchlässiges Kunststoffband einzulagern, um ein solches Band in Naßpressen mit verlängertem Pressenspalt einzusetzen (vgl. EP-A3-0 138 797, DE-A1-32 31 039). Alternativ oder in Kombination dazu kann auch vorgesehen sein, daß die Materialbahn nur teilweise in ein flüssigkeitsundurchlässiges Kunststoffband eingelassen ist und an einer Seite der Kunststoffbahn unter Bildung von offenen Kanälen zur Flüssigkeitsabführung vorsteht (vgl. EP-A2-0 098 502, DE-A1-32 35 468). Die erfindungsgemäße Materialbahn läßt sich also vielfältig einsetzen.In addition, there is also the possibility of storing the material web in a liquid-impermeable plastic band in order to use such a band in wet presses with an extended press nip (cf. EP-A3-0 138 797, DE-A1-32 31 039). Alternatively or in combination, it can also be provided that the material web is only partially embedded in a liquid-impermeable plastic band and protrudes on one side of the plastic web with the formation of open channels for liquid removal (cf. EP-A2-0 098 502, DE-A1- 32 35 468). The web of material according to the invention can thus be used in a variety of ways.

In der Zeichnung ist die Erfindung an Hand von Ausführungsbeispielen näher veranschaulicht. Es zeigen:

  • Figur (1) eine Draufsicht auf den Längsfaden Für eine Papiermaschinenbespannung;
  • Figur (2) einen Querschnitt durch den Längsfaden gemäß Figur (1);
  • Figur (3) eine Draufsicht auf einen Teil einer Papiermaschinenbespannung unter Verwendung der Längsfäden gemäß den Figuren (1) und (2).
In the drawing, the invention is illustrated in more detail using exemplary embodiments. Show it:
  • Figure (1) is a plan view of the longitudinal thread for a paper machine clothing;
  • Figure (2) shows a cross section through the longitudinal thread according to Figure (1);
  • Figure (3) is a plan view of part of a paper machine clothing using the longitudinal threads according to Figures (1) and (2).

Der in den Figuren (1) und (2) dargestellte Längsfaden (1) besteht im Grundsatz aus einem Seelenfaden (2) und einem den Seelenfaden (2) umschließenden, kettengewirkten Maschenfaden (3). Der Seelenfaden (2) bildet - wie insbesondere Figur (2) zeigt - ein Fadenbündel aus insgesamt sechs Einzelfäden (4, 5, 6, 7, 8, 9). Zwei (4, 8) dieser Einzelfäden sind als Monofile aus einem zugkräftigen Werkstoff, beispielsweise Polyamid, ausgebildet und nehmen im wesentlichen die auf den Längsfaden (1) wirkenden Zugspannungen auf. Die übrigen Einzelfäden (5, 6, 7, 9) können aus den verschiedensten Werkstoffen bestehen, da sie durch die monofilen Einzelfäden (4, 8) zugkraftentlastet sind. Das Fadenbündel ist nicht miteinander verzwirnt, weil es durch den Maschenfaden (3) umhüllt und damit zusammengehalten wird.The longitudinal thread (1) shown in Figures (1) and (2) basically consists of a core thread (2) and a warp-knitted stitch thread (3) surrounding the core thread (2). The soul thread (2) forms - as Figure (2) in particular shows - a bundle of threads from a total of six individual threads (4, 5, 6, 7, 8, 9). Two (4, 8) of these individual threads are formed as monofilaments from a tensile material, for example polyamide, and essentially absorb the tensile stresses acting on the longitudinal thread (1). The remaining individual threads (5, 6, 7, 9) can consist of a wide variety of materials, since they are relieved of tensile force by the monofilament individual threads (4, 8). The bundle of threads is not twisted together because it is enveloped by the stitch thread (3) and held together.

Figur (3) zeigt einen Ausschnitt aus einer Papiermaschinenbespannung, die unter Verwendung der in den Figuren (1) und (2) dargestellten Längsfäden (1) hergestellt worden ist. Die Längsfäden (1) verlaufen parallel in Laufrichtung der Papiermaschinenbespannung. Die Fadendichte ist relativ gering, beispielsweise drei Fäden/cm. Auf diese Weise entstehen zwischen den Längsfäden (1) entsprechend gerichtete Drainagekanäle, die die Entwässerung unterstützen. In Querrichtung verlaufen gerade durch die Maschenfäden in regelmäßigen Abständen Maschinenschüsse - beispielhaft mit (10) bezeichnet -. Sie durchkreuzen jeweils die Maschen der Maschenfäden (3) und liegen an der Unterseite der Seelenfäden (2) an. Ihr Abstand zueinander kann durch die Maschenzahl pro Längeneinheit und dadurch variiert werden, daß nicht durch jede Masche ein Maschinenschuß (10) gelegt wird. So kann beispielsweise die Maschendichte bei 6 bis 9 Maschen/cm und die Magazinschußdichte bei 3 Fäden/cm liegen. Selbstverständlich können auch andere Werte in Frage kommen.Figure (3) shows a section of a paper machine clothing, which has been produced using the longitudinal threads (1) shown in Figures (1) and (2). The longitudinal threads (1) run parallel in the running direction of the paper machine clothing. The thread density is relatively low, for example three threads / cm. In this way, appropriately directed drainage channels are created between the longitudinal threads (1), which support the drainage. In the transverse direction, machine wefts run through the mesh threads at regular intervals - denoted by (10) for example -. They each cross through the stitches of the stitch threads (3) and lie on the underside of the soul threads (2). Their distance from one another can be varied by the number of stitches per unit length and by the fact that a machine weft (10) is not placed through each stitch. For example, the stitch density can be 6 to 9 stitches / cm and the magazine weft density can be 3 threads / cm. Of course, other values can also be considered.

Der in Figur (3) dargestellte Ausschnitt zeigt nur eine Lage der Papiermaschinenbespannung. Es besteht die Möglichkeit, mehrere solcher Lagen übereinanderzulegen und durch Nadelverfilzung miteinander zu verbinden. Werden die Nahtstellen der einzelnen Lagen versetzt zueinander angeordnet, kann auf eine besondere Nahtverbindung verzichtet werden.The section shown in Figure (3) shows only one layer of the paper machine clothing. It is possible to lay several such layers on top of each other and to connect them with needle felting. If the seams of the individual layers are staggered, a special seam connection can be dispensed with.

Claims (14)

1. Web of material, in particular for clothing the press section of a papermaking machine or for use as a filter medium or as a press pad for chipboard presses, formed of knitted threads (3) extending in one direction, each of which encircles a core thread (2), and of binding threads, extending at right angles thereto, characterized in that the binding threads pass in the form of a magazine weft (10) straight through the knitted threads (3).
2. Web of material according to Claim 1, characterized in that the longitudinal threads (1) each consist of a core thread (2) and at least one knitted thread (3) encircling the latter.
3. Web of material according to Claim 1 or 2, characterized in that the knitted thread (3) has been formed by warp knitting.
4. Web of material according to any one of Claims 1 to 3, characterized in that the knitted thread (3) consists of a monofilament.
5. Web of material according to any one of Claims 1 to 4, characterized in that the core thread (2) consists of an untwisted bundle of threads.
6. Web of material according to Claim 5, characterized in that at least one of the individual threads (4, 5, 6, 7, 8, 9) forming the bundle of threads is constructed as a stuffer thread (6, 7, 8, 9) and at least one of the others is constructed as a tension- bearing thread (4, 5).
7. Web of material according to Claim 5 or 6, characterized in that at least one of the individual threads (4, 5, 6, 7, 8, 9) forming the bundle of threads consists of electrically conductive material.
8. Web of material according to any one of Claims 1 to 7, characterized in that the magazine wefts (10) extend across the back of the core threads (2).
9. Web of material according to any one of Claims 1 to 8, characterized in that the transverse threads (10) are constructed as monofilament or multifilament yarns.
10. Web of material according to any one of Claims 1 to 9, characterized in that the web of material is constructed as a needle felt.
11. Web of material according to any one of Claims 1 to 10, characterized in that the web of material has at least on one side a fibre web which has been attached to it by needling.
12. Web of material according to any one of Claims 1 to 9, characterized in that the web of material is embedded in a liquid-impermeable plastics band.
13. Web of material according to any one of Claims 1 to 9, characterized in that the web of material has been only partly inserted into a liquid-impermeable plastics band, protruding at one side of the plastics band to form open channels for the removal of liquid.
14. Process for manufacturing a web of material according to any one of Claims 1 to 13, wherein the knitted threads (3), and the core threads (2) encircled thereby, are manufactured, aligned in a mutually parallel arrangement and bonded together with the binding threads, characterized in that all the knitted threads (3) are produced simultaneously, and at the desired mutual spacing, by continuous loop formation with simultaneous delivery of the core thread (2) while at the same time a magazine weft (10) is driven as a binding thread through the knitted threads (3).
EP87106979A 1987-05-14 1987-05-14 Material web Expired - Lifetime EP0290653B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP87106979A EP0290653B1 (en) 1987-05-14 1987-05-14 Material web
DE8787106979T DE3762246D1 (en) 1987-05-14 1987-05-14 MATERIAL RAIL.
AT87106979T ATE51907T1 (en) 1987-05-14 1987-05-14 MATERIAL WEB.
ES87106979T ES2015284B3 (en) 1987-05-14 1987-05-14 MATERIAL TRACK
CA000566454A CA1322121C (en) 1987-05-14 1988-05-11 Strip of material and its manufacturing method
US07/193,595 US4948658A (en) 1987-05-14 1988-05-13 Strip of material and its manufacturing method
FI882245A FI89818C (en) 1987-05-14 1988-05-13 MATERIALBANA OCH FOERFARANDE FOER DESS FRAMSTAELLNING

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87106979A EP0290653B1 (en) 1987-05-14 1987-05-14 Material web

Publications (2)

Publication Number Publication Date
EP0290653A1 EP0290653A1 (en) 1988-11-17
EP0290653B1 true EP0290653B1 (en) 1990-04-11

Family

ID=8196988

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87106979A Expired - Lifetime EP0290653B1 (en) 1987-05-14 1987-05-14 Material web

Country Status (7)

Country Link
US (1) US4948658A (en)
EP (1) EP0290653B1 (en)
AT (1) ATE51907T1 (en)
CA (1) CA1322121C (en)
DE (1) DE3762246D1 (en)
ES (1) ES2015284B3 (en)
FI (1) FI89818C (en)

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EP2358939B1 (en) 2008-11-19 2015-04-29 Voith Patent GmbH Paper machine covering and method for the production thereof

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DE102011007291A1 (en) 2011-04-13 2012-10-18 Voith Patent Gmbh Method for producing a module, in particular endless module, for a paper machine clothing
WO2012140046A1 (en) 2011-04-13 2012-10-18 Voith Patent Gmbh Method for producing a module, in particular a continuous module, for a paper machine covering and continuous module

Also Published As

Publication number Publication date
ES2015284B3 (en) 1990-08-16
US4948658A (en) 1990-08-14
FI882245A0 (en) 1988-05-13
DE3762246D1 (en) 1990-05-17
FI882245A (en) 1988-11-15
ATE51907T1 (en) 1990-04-15
FI89818C (en) 1993-11-25
FI89818B (en) 1993-08-13
EP0290653A1 (en) 1988-11-17
CA1322121C (en) 1993-09-14

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