EP1788151B1 - Papermaking fabric - Google Patents

Papermaking fabric Download PDF

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Publication number
EP1788151B1
EP1788151B1 EP06122409A EP06122409A EP1788151B1 EP 1788151 B1 EP1788151 B1 EP 1788151B1 EP 06122409 A EP06122409 A EP 06122409A EP 06122409 A EP06122409 A EP 06122409A EP 1788151 B1 EP1788151 B1 EP 1788151B1
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EP
European Patent Office
Prior art keywords
binding
yarns
yarn
sections
paper machine
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EP06122409A
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German (de)
French (fr)
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EP1788151A1 (en
Inventor
Johann Boeck
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1788151A1 publication Critical patent/EP1788151A1/en
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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
    • D21F1/0045—Triple layer fabrics

Definitions

  • the invention relates to a papermaking wire, in particular a forming fabric, according to the preamble of patent claim 1.
  • Forming fabrics are used in the forming section of a paper machine.
  • a fiber suspension is applied from the headbox of the paper machine to a forming fabric or to two forming fabrics (Gap formers).
  • An object of the forming fabric here is to dewater the fiber suspension and form a fibrous web, as little as possible pulp fibers and fillers from the fiber suspension should be washed during the dewatering process.
  • the quality of the fibrous web formed is strongly influenced by the structure of the fibrous web-facing surface (paper side) of the forming fabric.
  • the life of the forming fabric is greatly affected by the structure of the paper machine facing surface (machine side) of the forming fabric.
  • the attachment sites In multi-ply fabrics where the fabric plies are held together by separate binding threads, i. due to binding threads, which do not form an integral part of the weave structure of at least the paper-side fabric layer, the attachment sites often cause indentations on the paper side which cause marks on the paper produced on such fabrics.
  • binding threads In multi-layer fabrics in which the binding threads an integral part of Web form, is provided by the binding threads often only low binding force between the fabric layers in favor of a planar as possible paper side.
  • the low connection between the fabric layers on the one hand results in a large thickness of the screen and on the other hand leads to a relative movement of the two fabric layers to each other in the operation of the screen.
  • the high thickness causes a high level of water dragging. Furthermore, a high sieve thickness increases the drainage resistance, which leads to poor drainage of the paper web, which has a disadvantageous effect particularly on fast paper machines, since the paper web at the end of the dewatering section has too high a water content.
  • Multilayer forming fabrics are, for example, from the EP 0 432 413 B1 , of the DE 297 24 238 U1 , of the EP 1 00 197 B1 , of the WO 2004 / 061211A2 and the US 2004/0149342 A1 known.
  • the still published document US2006 / 0169346 discloses a papermaker's fabric having upper and lower fabric layers bonded together by binding threads. According to D1, the binding threads form upper binding sections when woven with upper MD threads and lower binding sections when weaving with lower MD threads, each binding thread forming a lower binding section between successive upper binding sections.
  • WO2004 / 111333 a double-layered forming fabric in which the two fabric layers are connected to each other by binding threads.
  • binding threads which do not form a lower attachment section when interweaving with the transverse threads between two successive upper attachment sections.
  • the known papermaking fabric in particular Formiersieb, has an upper transverse yarns comprising upper fabric layer whose outer side forms a paper side of the papermaking fabric and a lower transverse threads comprising lower fabric layer whose outside forms a machine side of the papermachine fabric. Furthermore, the known papermachine fabric has binding yarns arranged in pairs and extending transversely of the transverse yarns, which join the upper and lower fabric layers together by forming the binding yarns of each pair with upper transverse yarns forming upper tie-up portions and lower transverse yarns forming lower tie-down portions are interwoven.
  • each upper attachment portion is formed by interweaving a binding thread of the pair with one or more successive upper transverse threads, wherein between two successive upper attachment portions of the binding thread, an upper attachment portion of the other binding thread of the pair is arranged. Further, at each upper attachment portion, a binder thread crosses at least one upper transverse thread as it threads on the outside of the upper fabric layer. At each lower attachment portion, a binder thread crosses at least one lower transverse thread as it travels on the outside of the lower fabric layer.
  • the screen has binding thread rapports in each of which the interweaving of the binding threads with upper and lower transverse threads is repeated, the upper attachment sections forming first attachment sections and second attachment sections, of which the second attachment sections comprise as many or more successive upper transverse threads as the first upper connecting sections and wherein successive second upper connecting sections formed by a binding thread of the pair are provided between in which the binding thread is not interwoven with lower transverse threads, and - with binding thread replicas in which the interweaving of the binding threads with upper transverse threads and lower transverse threads is repeated in each case, more than two successive upper attachment sections being arranged in each binding thread repeat.
  • the papermaking fabric according to the invention is characterized in that the weaving paths of the two binding threads of the group differ from one another only in that they are offset from one another by a number of upper transverse threads.
  • a low marking tendency of the paper side is further supported by the weave pattern of the upper fabric layer being a plain weave.
  • the weaving paths of the two binding threads of the pair differ from each other only in that they are offset from one another by a number of upper transverse threads, wherein preferably the weaving paths of the two binding threads of a pair are offset from one another by half of the binding thread repeat.
  • the advantage of this arrangement is that each binder thread of the pair in one half of the binder thread repeat weaves the weave path with the top and bottom cross threads weaving the other of the two binder threads in the other half of the binder thread repeat.
  • the second attachment portions comprise three successive upper transverse threads, wherein the binding thread on the outer side continuously crosses the first and the third of the upper transverse threads, and wherein the binding thread between the upper and lower fabric layers continuously crosses the second of the upper transverse threads.
  • the binding thread crosses between the upper and lower
  • Fabric layer running several, preferably three upper transverse threads. In this way, a floating of the binding thread between the upper and the lower fabric layer is provided, through which the wire is stiffened.
  • a first upper connection portion forms between the successive formed by the weaving of a binding thread second upper connecting portions of the other binding yarn of the pair by interweaving with at least one upper transverse thread, a first upper connection portion, wherein the first upper connection portion preferably disposed between lower connection portions is, which are formed by the same binder thread of the pair.
  • a fixed connection of the upper Fabric layer provided to the lower fabric layer through the binder thread Due to the floating of the other binding thread of the pair between the second upper attachment portions, the first upper attachment portion of the binding thread, which is disposed between the second upper attachment points of the other binding thread of the pair, is supported, whereby the first upper attachment portion is not pulled towards the lower fabric layer becomes.
  • the force for supporting the floatation is at least partially absorbed by the two second upper connecting sections. As a result, a firm connection between the two fabric layers is provided at the same time flat paper side.
  • first and second upper connection portions are formed, between which a lower connection portion is arranged.
  • first and second attachment portions formed by a binder thread are connected to each other via a lower connection portion, whereby a firm connection between the upper and lower fabric layer is achieved.
  • each lower attachment portion is formed by interweaving a binding thread with only a lower transverse thread.
  • a further particularly preferred development of the invention provides that when a binding thread of the pair interweaves with the formation of a second upper connecting portion with upper transverse threads, weaves the other binding thread of the pair to form a lower connection portion with at least one lower transverse threads, the upper transverse threads of the second upper connecting portion is arranged opposite.
  • the upper fabric layer is connected to the lower fabric layer via lower attachment portions through a first upper attachment portion of a binding thread disposed between two second upper attachment portions of the other binding thread connected, both of which are arranged under the second upper attachment portions of the other binding thread.
  • a preferred development of the invention provides that a binder thread repeat in which the weaving of a binding thread with upper and lower transverse threads repeats comprises 40 transverse threads.
  • the ratio of upper to lower transverse threads can be 1: 1.
  • the upper fabric layer may be formed by upper longitudinal threads extending in the binding yarn direction and woven only with upper transverse threads.
  • the lower fabric layer may also be formed by lower longitudinal threads extending in the binding thread direction, which are interwoven only with lower transverse threads.
  • a concrete embodiment of the invention provides that the transverse threads are warp threads and the binding threads or the longitudinal threads are weft threads.
  • FIG. 2 shows an entire repeat of an embodiment of a forming machine according to the invention as a papermaking fabric 100
  • the FIG. 1 represents a binding thread course of a binding thread pair of the screen 100.
  • the forming fabric 100 comprises an upper fabric layer 101 having an outer side 103 forming the paper side and a lower fabric layer 102 having an outer side 104 forming the machine side.
  • the upper fabric layer 101 is formed by interweaving pairs of binding yarns B1 to B20 with upper transverse yarns OK1, OK3, OK5, OK7, .... to OK39, and interweaving upper longitudinal yarns OS1 to OS10 with the upper one upper transverse threads OK1, OK3, OK5, OK7, .... to OK 39 formed (which in the FIG. 1 or 3 right-hand designations "OK” or "UK” should be used as a substitute for all upper or lower transverse threads).
  • the lower fabric layer 102 is formed by interweaving the paired binding yarns B1 to B20 with lower transverse threads UK2, UK4, UK6, UK8, ...., UK40 and interweaving lower longitudinal threads US1 to US20 with the lower transverse threads UK2 , UK4, UK6, UK8, ...., UK40.
  • a repeat unit of the embodiment according to the invention therefore comprises 20 binding threads, 30 upper and lower longitudinal threads and 40 upper and lower transverse threads.
  • the ratio of upper to lower transverse threads is 1: 1.
  • the weave pattern of the upper fabric layer 101 further forms a plain weave.
  • the invention is based essentially on the course of the binding threads B19 and B20 in the FIG. 1 or 2 will be explained.
  • binding threads B1 to B20 and the longitudinal threads OS1 to OS10 and US1 to US20 in this case extend transversely to the upper and lower transverse threads.
  • the upper fabric layer 101 and the lower Fabric layer 102 interconnected by the binding threads B19 and B20 of each pair with upper transverse threads OK1, OK3, OK5, OK7, .... to OK 39 to form upper attachment portions OA1 to OA6 and lower transverse threads UK2, UK4, UK6, UK8 , ...., UK40 are interwoven to form lower attachment portions UA1 to UA4, wherein each upper attachment portion OA1 to OA6 is formed by interweaving a binding thread B19, B20 of the pair with one or more successive upper transverse threads OK1, OK3, OK5, OK7 , ....
  • an upper attachment portion of the other binding thread of the pair is arranged.
  • the upper attachment section OA3 of the binding thread B20 is arranged.
  • An upper attachment section OA1 to OA6 is formed by a binding thread B19, B20 on the outer side 103 of the upper fabric layer 101 continuously crossing at least one of the upper transverse threads OK1, OK3, OK5, OK7, .... to OK 39.
  • the upper attachment portions OA2 and OA6 are formed by interweaving three successive upper transverse threads (OK7 to OK11 at OA2 and OK35 to OK39 at OA6) with the binder thread B19, the binder thread B19 at the outer side 103 of the upper fabric layer 101, the first and third of the upper transverse threads cross, and the binder thread B19 between the upper 101 and lower fabric layers 102 continuously crosses the second of the upper transverse threads.
  • the upper connection sections OA3 and OA5 are further characterized by the Weaving the binding thread B20 formed with three consecutive upper transverse threads (OK15 to OK19 at OA3 and OK27 to OK31 at OA5).
  • the upper attachment sections OA2, OA3, OA5 and OA6 represent second upper attachment sections.
  • first upper bonding portions OA1 and OA4 are formed by interweaving each upper transverse thread (OK3 at OA1 and OK23 at OA4) with the bonding yarns B20 and B19, respectively.
  • the weave pattern of the papermaker's fabric 100 repeats in a repeat OK1 to OK39 and UK2 to UK40 extending in the binder threading direction along the length of the repeat of the weaving path of one of the binding threads B19 or B20.
  • more than two upper connecting sections in each case six upper connecting sections OA1 to OA6, are arranged consecutively on the length of the repeat OK1 to OK39 and UK2 to UK40 in the direction of the binding thread
  • the forming fabric 100 further has lower attachment portions UA1 to UA4, wherein at each lower attachment portion UA1 to UA4, a binding thread B19, B20 crosses at least one lower transverse thread when the binding thread B19, B20 runs on the outer side 104 of the lower fabric layer 102.
  • the weaving paths of the two binding threads B19, B20 of the pair differ from each other only in that they are offset from each other by a number of upper transverse threads, namely the upper transverse threads OK5 to OK23, which corresponds to half of the binder thread repeat.
  • the forming fabric 100 has successive formed by a binder yarn of the pair second upper connecting portions, between which the binding yarn is not interwoven with lower transverse threads.
  • the binding thread B20 between the through The second upper joining portions OA3 and OA5 formed thereon are not interwoven with lower transverse threads UA, but rather, the binder thread B20 between the successive second upper joining portions OA3 and OA5 between the upper fabric layer 101 and lower fabric layer 102 continuously crosses the three successive upper transverse threads OK21 to OK25 ,
  • a first upper attachment portion formed by interweaving the other binding thread with an upper transverse thread of the pair is arranged between the successive second upper connecting sections OA3 and OA5 of the binding thread B20.
  • the first upper connecting section OA4 formed by interweaving the binding thread B19 with the upper transverse thread OK23 is arranged between the two second upper connecting sections OA3 and OA5 of the binding thread B20.
  • the forming fabric 100 comprises successively arranged first and second upper attachment portions of a binding thread, between which a lower attachment portion of the same binding thread is arranged.
  • the second upper attachment portion OA3 of the binding thread B20 follows the first binding thread portion OA1 of the binding thread B20, wherein the lower attachment portion UA1 of the binding thread B20 is arranged between the two upper attachment portions OA1 and OA3.
  • the forming fabric 100 further comprises successive lower attachment portions formed by a binder yarn of the pair, between which the binder yarn is interwoven with an upper transverse yarn to form a first upper attachment portion.
  • the first upper connection section OA4 of the binding thread B19 is arranged between the two lower attachment sections UA2 and UA3 of the binding thread B19, so that the first upper attachment section arranged between the two second upper attachment sections OA3 and OA5 is held on both sides by the lower attachment sections UA2 and UA3 becomes.
  • first and second upper connecting sections are provided which comprise the same number of upper transverse threads, namely three successive upper transverse threads.
  • the first upper attachment portions each comprise an upper transverse thread
  • the second upper attachment portions of each binding thread comprise three and five successive upper transverse threads.
  • first and second upper connecting sections are provided which comprise the same number of upper transverse threads, namely one upper transverse thread each.

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  • Woven Fabrics (AREA)
  • Paper (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

The fabric has an upper layer (101) in a plain weave facing the paper side and a lower layer (102) on the machine side. The two layers are linked by paired connecting yarns (B19, B20) so that the upper fabric is joined at least twice, preferably six times (OA1 to OA6) to the upper transverse yarns (OK1 to OK39) in each pattern repeat. The paths of the two connecting yarns only differ in that they displaced by a number of upper transverse yarns. The repeat pattern of the connecting yarns preferably corresponds to 40 transverse yarns. The upper and lower fabric layers (101, 102) have the same number of transverse yarns but there are twice as many longitudinal yarns in the lower layer than in the upper layer. The transverse yarns (OK, UK) are warp threads and the connecting and longitudinal yarns are weft threads.

Description

Die Erfindung betrifft ein Papiermaschinensieb, insbesondere ein Formiersieb, nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a papermaking wire, in particular a forming fabric, according to the preamble of patent claim 1.

Formiersiebe finden in der Formierpartie einer Papiermaschine Verwendung. Beim Formierprozess wird eine Fasersuspension vom Stoffauflauf der Papiermaschine auf ein Formiersieb oder auf zwei Formiersiebe (bei Gap - Formern) aufgebracht. Eine Aufgabe des Formiersiebs besteht hierbei darin, die Fasersuspension zu entwässern und eine Faserstoffbahn zu bilden, wobei so wenig wie möglich Zellstofffasern und Füllstoffe aus der Fasersuspension beim Entwässerungsprozess geschwemmt werden sollen.Forming fabrics are used in the forming section of a paper machine. In the forming process, a fiber suspension is applied from the headbox of the paper machine to a forming fabric or to two forming fabrics (Gap formers). An object of the forming fabric here is to dewater the fiber suspension and form a fibrous web, as little as possible pulp fibers and fillers from the fiber suspension should be washed during the dewatering process.

Die Qualität der gebildeten Faserstoffbahn wird hierbei stark von der Struktur der zur Faserstoffbahn weisenden Oberfläche (Papierseite) des Formiersiebs mitbestimmt. Die Lebensdauer des Formiersiebs wird hingegen stark von der Struktur der zur Papiermaschine weisenden Oberfläche (Maschinenseite) des Formiersiebs beeinflusst.The quality of the fibrous web formed is strongly influenced by the structure of the fibrous web-facing surface (paper side) of the forming fabric. On the other hand, the life of the forming fabric is greatly affected by the structure of the paper machine facing surface (machine side) of the forming fabric.

Um diesen zum Teil sich widersprechenden Anforderungen Rechnung tragen zu können, wurden mehrlagige Papiermaschinensiebe mit einer papierseitigen und einer maschinenseitigen Gewebelage entwickelt, wobei die beiden Gewebelagen durch sog. Bindefäden miteinander verbunden sind.In order to be able to take these partly conflicting requirements into account, multilayer paper machine screens with a paper-side and a machine-side fabric layer have been developed, wherein the two fabric layers are connected to one another by so-called binding threads.

Bei mehrlagigen Geweben, bei denen die Gewebelagen durch separate Bindefäden zusammengehalten werden, d.h. durch Bindefäden, die keinen integralen Bestandteil der Webstruktur zumindest der papierseitigen Gewebelage bilden, verursachen die Anbindestellen oftmals auf der Papierseite Vertiefungen, welche bei dem auf solchen Sieben produzierten Papier Markierungen bewirkt.In multi-ply fabrics where the fabric plies are held together by separate binding threads, i. due to binding threads, which do not form an integral part of the weave structure of at least the paper-side fabric layer, the attachment sites often cause indentations on the paper side which cause marks on the paper produced on such fabrics.

Bei mehrlagigen Geweben bei denen die Bindefäden einen integralen Bestandteil der Webstruktur bilden, wird durch die Bindefäden eine oftmals nur geringe Bindekraft zwischen den Gewebelagen zu Gunsten einer möglichst planaren Papierseite bereitgestellt. Die geringe Verbindung zwischen den Gewebelagen hat einerseits eine große Dicke des Siebs zur Folge und führt andererseits zu einer Relativbewegung der beiden Gewebelagen zueinander im Betrieb des Siebs.In multi-layer fabrics in which the binding threads an integral part of Web form, is provided by the binding threads often only low binding force between the fabric layers in favor of a planar as possible paper side. The low connection between the fabric layers on the one hand results in a large thickness of the screen and on the other hand leads to a relative movement of the two fabric layers to each other in the operation of the screen.

Durch die hohe Dicke wird ein hohes Maß an Wasserschleppen verursacht. Des weiteren erhöht eine hohe Siebdicke den Entwässerungswiderstand, was zu einer schlechten Entwässerung der Papierbahn führt, was sich insbesondere bei schnellen Papiermaschinen nachteilig auswirkt, da die Papierbahn am Ende der Entwässerungsstrecke einen zu hohen Wassergehalt hat.The high thickness causes a high level of water dragging. Furthermore, a high sieve thickness increases the drainage resistance, which leads to poor drainage of the paper web, which has a disadvantageous effect particularly on fast paper machines, since the paper web at the end of the dewatering section has too high a water content.

Durch die Relativbewegung der beiden Gewebelagen zueinander, werden diese gegeneinander verschlissen, was die Lebensdauer des Siebs deutlich verkürzt.Due to the relative movement of the two fabric layers to each other, these are worn against each other, which significantly reduces the life of the screen.

Mehrlagige Formiersiebe sind bspw. aus der EP 0 432 413 B1 , der DE 297 24 238 U1 , der EP 1 00 197 B1 , der WO 2004/061211A2 und der US 2004/0149342 A1 bekannt.Multilayer forming fabrics are, for example, from the EP 0 432 413 B1 , of the DE 297 24 238 U1 , of the EP 1 00 197 B1 , of the WO 2004 / 061211A2 and the US 2004/0149342 A1 known.

Das noch veröffentlichte Dokument US2006/0169346 offenbart ein Papiermaschinensieb mit einer oberen und einer unteren Gewebelage, die miteinander durch Bindefäden verbunden sind. Gemäß der D1 bilden die Bindefäden beim Verweben mit oberen MD-Fäden obere Abbindungsabschnitte und beim Verweben mit unteren MD-Fäden untere Anbindungsabschnitte, wobei jeder Bindefaden zwischen aufeinander folgenden oberen Anbindungsabschnitten einen unteren Anbindungsabschnitt bildet.The still published document US2006 / 0169346 discloses a papermaker's fabric having upper and lower fabric layers bonded together by binding threads. According to D1, the binding threads form upper binding sections when woven with upper MD threads and lower binding sections when weaving with lower MD threads, each binding thread forming a lower binding section between successive upper binding sections.

Ferner offenbart das Dokument WO2004/111333 ein doppellagiges Formiersieb bei dem die beiden Gewebelagen durch Bindefäden miteinander verbunden sind. Gemäß der WO2004/111333 gibt es wie beim erfindungsgemäßen Papiermaschinensieb Bindefäden, die beim Verweben mit den Querfäden zwischen zwei aufeinanderfolgenden oberen Anbindeabschnitten keinen unteren Anbindeabschnitt bilden.Further, the document discloses WO2004 / 111333 a double-layered forming fabric in which the two fabric layers are connected to each other by binding threads. According to the WO2004 / 111333 As with the papermaking fabric according to the invention, there are binding threads which do not form a lower attachment section when interweaving with the transverse threads between two successive upper attachment sections.

Es ist die Aufgabe der vorliegenden Erfindung ein Papiermaschinensieb vorzuschlagen, bei dem die Verbindung zwischen den papier- und maschinenseitigen Gewebelagen erhöht wird, ohne dass die Planarität der papierseitigen Gewebelage negativ beeinflusst wird.It is the object of the present invention to propose a papermaking fabric in which the connection between the paper and machine side fabric plies is increased without adversely affecting the planarity of the paper side fabric layer.

Die Aufgabe wird erfingdungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst.The object is achieved according to the invention by the features of patent claim 1.

Das bekannte Papiermaschinensieb, insbesondere Formiersieb, hat eine obere Querfäden umfassende obere Gewebelage deren Außenseite eine Papierseite des Papiermaschinensiebs bildet und eine untere Querfäden umfassende untere Gewebelage deren Außenseite eine Maschinenseite des Papiermaschinensiebs bildet. Des weiteren hat das bekannte Papiermaschinensieb in Paaren angeordnete und sich quer zu den Querfäden erstreckende Bindefäden, welche die obere und die untere Gewebelage miteinander verbinden, indem die Bindefäden jedes Paares mit oberen Querfäden unter Ausbildung von oberen Anbindungsabschnitten und mit unteren Querfäden unter Ausbildung von unteren Anbindungsabschnitten verwoben sind. Hierbei wird jeder obere Anbindungsabschnitt durch das Verweben eines Bindefadens des Paares mit einem oder mehreren aufeinander folgenden oberen Querfäden gebildet, wobei zwischen zwei aufeinander folgenden oberen Anbindungsabschnitten des Bindefadens ein oberer Anbindungsabschnitt des anderen Bindefadens des Paares angeordnet ist. Bei jedem oberen Anbindungsabschnitt kreuzt des weiteren ein Bindefaden zumindest einen oberen Querfaden, wenn er Bindefaden auf der Außenseite der oberen Gewebelage läuft. Bei jedem unteren Anbindungsabschnitt kreuzt ein Bindefaden zumindest einen unteren Querfaden, wenn er auf der Außenseite der unteren Gewebelage läuft. Darüber hinaus hat das Sieb Bindefadenrapporte in welchen sich jeweils das Verweben der Bindefäden mit oberen und unteren Querfäden wiederholt, wobei die oberen Anbindungsabschnitte erste Anbindungsabschnitte und zweite Anbindungsabschnitte bilden, von denen die zweiten Anbindungsabschnitte gleich viel oder mehr aufeinander folgende obere Querfäden umfassen wie bzw. als die ersten oberen Anbindungsabschnitte und wobei aufeinander folgende durch einen Bindefaden des Paares gebildete zweite obere Anbindungsabschnitte vorgesehen sind, zwischen denen der Bindefaden nicht mit unteren Querfäden verwoben ist, und - mit Bindefadenrapporten in welchen sich jeweils das Verweben der Bindefäden mit oberen Querfäden und unteren Querfäden wiederholt, wobei in jedem Bindefadenrapport mehr als zwei aufeinander folgende obere Anbindungsabschnitte angeordnet sind.The known papermaking fabric, in particular Formiersieb, has an upper transverse yarns comprising upper fabric layer whose outer side forms a paper side of the papermaking fabric and a lower transverse threads comprising lower fabric layer whose outside forms a machine side of the papermachine fabric. Furthermore, the known papermachine fabric has binding yarns arranged in pairs and extending transversely of the transverse yarns, which join the upper and lower fabric layers together by forming the binding yarns of each pair with upper transverse yarns forming upper tie-up portions and lower transverse yarns forming lower tie-down portions are interwoven. Here, each upper attachment portion is formed by interweaving a binding thread of the pair with one or more successive upper transverse threads, wherein between two successive upper attachment portions of the binding thread, an upper attachment portion of the other binding thread of the pair is arranged. Further, at each upper attachment portion, a binder thread crosses at least one upper transverse thread as it threads on the outside of the upper fabric layer. At each lower attachment portion, a binder thread crosses at least one lower transverse thread as it travels on the outside of the lower fabric layer. In addition, the screen has binding thread rapports in each of which the interweaving of the binding threads with upper and lower transverse threads is repeated, the upper attachment sections forming first attachment sections and second attachment sections, of which the second attachment sections comprise as many or more successive upper transverse threads as the first upper connecting sections and wherein successive second upper connecting sections formed by a binding thread of the pair are provided between in which the binding thread is not interwoven with lower transverse threads, and - with binding thread replicas in which the interweaving of the binding threads with upper transverse threads and lower transverse threads is repeated in each case, more than two successive upper attachment sections being arranged in each binding thread repeat.

Das erfindungsgemäße Papiermaschinensieb ist dadurch gekennzeichnet, dass sich die Webpfade der beiden Bindefäden der Gruppe nur dadurch voneinander unterscheiden, dass diese zueinander um eine Anzahl von oberen Querfäden versetzt sind.The papermaking fabric according to the invention is characterized in that the weaving paths of the two binding threads of the group differ from one another only in that they are offset from one another by a number of upper transverse threads.

Dadurch dass auf der Länge des Bindefadenrapports mehr als zwei aufeinander folgende obere Anbindungsabschnitte angeordnet sind, wird ein Sieb mit einer gegenüber dem Stand der Technik bedeutend höheren Anzahl von Anbindungsabschnitten der Papierseite geschaffen, wodurch die Bindungsfrequenz zwischen oberer und unterer Gewebelage deutlich erhöht wird, was zu einer verbesserten Anbindung der unteren an die obere Gewebelage führt. Durch die Erhöhung der Anzahl der oberen bzw. papierseitigen Anbindungsabschnitte wird des weiteren deren Länge verkürzt, was zu einer verbesserten Planarität der oberen Gewebelage führt, da sich die einzelnen oberen Anbindungsabschnitte aufgrund deren Kürze nicht gegenüber der unteren Gewebelage wölben können, da eine Vielzahl der Anbindungsabschnitte beidseitig über untere Anbindungsabschnitte mit der unteren Gewebelage verbunden sind.As a result of the fact that more than two successive upper attachment sections are arranged along the length of the binder thread repeat, a sieve is created with a significantly higher number of attachment sections of the paper side compared with the prior art, whereby the binding frequency between the upper and lower fabric layers is significantly increased an improved connection of the lower leads to the upper fabric layer. By increasing the number of upper or paper-side connection sections of their further length is shortened, which leads to improved planarity of the upper fabric layer, since the individual upper connection sections can not buckle due to their shortness compared to the lower fabric layer, as a plurality of connection sections are connected on both sides via lower connecting portions with the lower fabric layer.

Nach einer bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass vier oder mehr, insbesondere sechs obere Anbindungsabschnitte auf der Länge des Bindefadenrapports angeordnet sind. Hierdurch wird eine gute Anbindung der oberen an die untere Gewebelage sichergestellt.According to a preferred embodiment of the invention, it is provided that four or more, in particular six upper connection sections are arranged along the length of the binder thread repeat. This ensures a good connection of the upper to the lower fabric layer.

Eine geringe Markierungsneigung der Papierseite wird des weiteren dadurch unterstützt, indem das Webmuster der oberen Gewebelage eine Leinwandbindung ist.A low marking tendency of the paper side is further supported by the weave pattern of the upper fabric layer being a plain weave.

Vorzugsweise unterscheiden sich die Webpfade der beiden Bindefäden des Paares nur dadurch voneinander, dass diese zueinander um eine Anzahl von oberen Querfäden versetzt sind, wobei vorzugsweise die Webpfade der beiden Bindefäden eines Paares um die Hälfte des Bindefadenrapports zueinander versetzt sind. Der Vorteil dieser Anordnung liegt darin, dass jeder Bindefaden des Paares in einer Hälfte des Bindefadenrapports mit den oberen und unteren Querfäden den Webpfad webt, der andere der beiden Bindefäden in der jeweils anderen Hälfte des Bindefadenrapports webt. Hierdurch wird erreicht, dass beide Rapporthälften auf die Bindfadenverläufe bezogen symmetrisch zueinander sind, wodurch u.a. eine symmetrisch verteilte Anbindung der beiden Gewebelagen erreicht und die Markierungsneigung bedingt durch eine unsymmetrische Verteilung der Anbindungsabschnitte, wie dies bspw. bei dem in der EP100197B1 gezeigten Sieb der Fall ist, vermieden wird.Preferably, the weaving paths of the two binding threads of the pair differ from each other only in that they are offset from one another by a number of upper transverse threads, wherein preferably the weaving paths of the two binding threads of a pair are offset from one another by half of the binding thread repeat. The advantage of this arrangement is that each binder thread of the pair in one half of the binder thread repeat weaves the weave path with the top and bottom cross threads weaving the other of the two binder threads in the other half of the binder thread repeat. This ensures that both repeat halves are symmetrical to each other on the course of the threads, whereby, inter alia, a symmetrically distributed connection of the two fabric layers is achieved and the marking tendency is due to an asymmetrical distribution of the connection sections, as for example in the case of EP100197B1 sieve is the case, is avoided.

Hierbei wird insbesondere durch die kürzeren ersten Anbindungsabschnitte eine feste Anbindung der oberen an die untere Gewebelage bewirkt.In this case, a fixed connection of the upper to the lower fabric layer is effected in particular by the shorter first connection sections.

Vorzugsweise umfassen die zweiten Anbindungsabschnitte drei aufeinander folgende obere Querfäden, wobei der Bindefaden auf der Außenseite laufend den ersten und den dritten der oberen Querfäden kreuzt und wobei der Bindefaden zwischen der oberen und unteren Gewebelage laufend den zweiten der oberen Querfäden kreuzt.Preferably, the second attachment portions comprise three successive upper transverse threads, wherein the binding thread on the outer side continuously crosses the first and the third of the upper transverse threads, and wherein the binding thread between the upper and lower fabric layers continuously crosses the second of the upper transverse threads.

Eine konkrete Ausgestaltung der Erfindung sieht vor, dass auf der Länge des Bindefadenrapports zwei erste obere Anbindungsabschnitte und vier zweite obere Anbindungsabschnitte angeordnet sind, wobei deren Reihenfolge insbesondere wie folgt ist:

  1. 1. ein erster Anbindungsabschnitt,
  2. 2. ein zweiter Anbindungsabschnitt,
  3. 3. ein zweiter Anbindungsabschnitt,
  4. 4. ein erster Anbindungsabschnitt,
  5. 5. ein zweiter Anbindungsabschnitt,
  6. 6. ein zweiter Anbindungsabschnitt.
A specific embodiment of the invention provides that two first upper connecting sections and four second upper connecting sections are arranged along the length of the binder thread repeat, their sequence being in particular as follows:
  1. 1. a first connection section,
  2. 2. a second connection section,
  3. 3. a second connection section,
  4. 4. a first connection section,
  5. 5. a second connection section,
  6. 6. a second connection section.

Vorzugsweise kreuzt zwischen aufeinander folgenden zweiten oberen Anbindungsabschnitten der Bindefaden zwischen der oberen und unterenPreferably, between successive second upper attachment portions, the binding thread crosses between the upper and lower

Gewebelage laufend mehrere, bevorzugt drei obere Querfäden. Hierdurch wird eine Flottierung des Bindefadens zwischen der oberen und der unteren Gewebelage bereitgestellt, durch welche das Sieb ausgesteift wird.Fabric layer running several, preferably three upper transverse threads. In this way, a floating of the binding thread between the upper and the lower fabric layer is provided, through which the wire is stiffened.

Vorzugsweise ist des weiteren vorgesehen, dass zwischen den aufeinander folgenden durch das Verweben des einen Bindefadens gebildeten zweiten oberen Anbindungsabschnitten der andere Bindefaden des Paares durch das Verweben mit zumindest einem oberen Querfaden einen ersten oberen Anbindungsabschnitt ausbildet, wobei der erste obere Anbindungsabschnitt vorzugsweise zwischen unteren Anbindungsabschnitten angeordnet ist, die durch den selben Bindefaden des Paares gebildet werden. Hierdurch wird eine feste Anbindung der oberen Gewebelage an die untere Gewebelage durch den Bindefaden bereitgestellt. Aufgrund der Flottierung des anderen Bindefadens des Paares zwischen den zweiten oberen Anbindungsabschnitten wird der erste obere Anbindungsabschnitt des Bindefadens, der ja zwischen den zweiten oberen Anbindungsstellen des anderen Bindefadens des Paares angeordnet ist, abgestützt, wodurch der erste obere Anbindungsabschnitt nicht in Richtung der unteren Gewebelage gezogen wird. Die Kraft zur Abstützung der Flottierung wird hierbei zumindest teilweise durch die beiden zweiten oberen Anbindungsabschnitte aufgenommen. Hierdurch wird eine feste Verbindung zwischen den beiden Gewebelagen bei gleichzeitig ebener Papierseite bereitgestellt.Preferably, it is further provided that forms between the successive formed by the weaving of a binding thread second upper connecting portions of the other binding yarn of the pair by interweaving with at least one upper transverse thread, a first upper connection portion, wherein the first upper connection portion preferably disposed between lower connection portions is, which are formed by the same binder thread of the pair. As a result, a fixed connection of the upper Fabric layer provided to the lower fabric layer through the binder thread. Due to the floating of the other binding thread of the pair between the second upper attachment portions, the first upper attachment portion of the binding thread, which is disposed between the second upper attachment points of the other binding thread of the pair, is supported, whereby the first upper attachment portion is not pulled towards the lower fabric layer becomes. The force for supporting the floatation is at least partially absorbed by the two second upper connecting sections. As a result, a firm connection between the two fabric layers is provided at the same time flat paper side.

Vorzugsweise ist des weiteren vorgesehen, dass durch das Verweben eines Bindefadens des Paares mit oberen und unteren Querfäden aufeinander folgend angeordnete erste und zweite obere Anbindungsabschnitte gebildet werden, zwischen denen ein unterer Anbindungsabschnitt angeordnet ist. Somit sind die durch einen Bindefaden gebildeten zueinander benachbarten ersten und zweiten Anbindungsabschnitte über einen unteren Anbindungsabschnitt miteinander verbunden, wodurch eine feste Verbindung zwischen oberer und unterer Gewebelage erreicht wird.Preferably, it is further provided that by interweaving a binding thread of the pair with upper and lower transverse threads successively arranged first and second upper connection portions are formed, between which a lower connection portion is arranged. Thus, the mutually adjacent first and second attachment portions formed by a binder thread are connected to each other via a lower connection portion, whereby a firm connection between the upper and lower fabric layer is achieved.

Vorzugsweise wird jeder untere Anbindungsabschnitt durch das Verweben eines Bindefadens mit nur einen unteren Querfaden gebildet.Preferably, each lower attachment portion is formed by interweaving a binding thread with only a lower transverse thread.

Eine weitere besonders bevorzugte Weiterbildung der Erfindung sieht vor, dass wenn ein Bindefaden des Paares unter Ausbildung eines zweiten oberen Anbindungsabschnitts mit oberen Querfäden verwebt, der andere Bindefaden des Paares unter Ausbildung eines unteren Anbindungsabschnitts mit zumindest einem unteren Querfäden verwebt, der den oberen Querfäden des zweiten oberen Anbindungsabschnitts gegenüberliegend angeordnet ist. Somit ist bspw. die obere Gewebelage durch einen ersten oberen Anbindungsabschnitt eines Bindefadens, der zwischen zwei zweiten oberen Anbindungsabschnitten des anderen Bindefadens angeordnet ist, mit der unteren Gewebelage über untere Anbindungsabschnitte verbunden, die beide unter den zweiten oberen Anbindungsabschnitten des anderen Bindefadens angeordnet sind. Hierdurch wird eine gleichmäßige Kräfteverteilung bei der Anbindung zwischen den beiden Gewebelagen erreicht, weshalb das Sieb besonders dünn ist und dessen Papierseite eine hohe Planarität aufweist.A further particularly preferred development of the invention provides that when a binding thread of the pair interweaves with the formation of a second upper connecting portion with upper transverse threads, weaves the other binding thread of the pair to form a lower connection portion with at least one lower transverse threads, the upper transverse threads of the second upper connecting portion is arranged opposite. Thus, for example, the upper fabric layer is connected to the lower fabric layer via lower attachment portions through a first upper attachment portion of a binding thread disposed between two second upper attachment portions of the other binding thread connected, both of which are arranged under the second upper attachment portions of the other binding thread. As a result, a uniform distribution of forces in the connection between the two fabric layers is achieved, which is why the screen is particularly thin and whose paper side has a high planarity.

Um eine möglichst große Gestaltungsmöglichkeit bei der Ausbildung des erfindungsgemäßen Siebs zu haben sieht eine bevorzugte Weiterbildung der Erfindung vor, dass ein Bindefadenrapport in welchem sich das Verweben eines Bindefadens mit oberen und unteren Querfäden wiederholt, 40 Querfäden umfasst.In order to have the greatest possible design possibilities in the embodiment of the inventive screen, a preferred development of the invention provides that a binder thread repeat in which the weaving of a binding thread with upper and lower transverse threads repeats comprises 40 transverse threads.

Des weiteren kann das Verhältnis von oberen zu unteren Querfäden 1:1 sein.Furthermore, the ratio of upper to lower transverse threads can be 1: 1.

Zusätzlich zu dem Verweben der Bindefäden mit den oberen Querfäden kann die obere Gewebelage durch sich in Bindefadenrichtung erstreckende obere Längsfäden gebildet werden, die nur mit oberen Querfäden verwoben sind. Des weiteren kann die untere Gewebelage zusätzlich zu dem Verweben der Bindefäden mit den unteren Querfäden durch sich in Bindefadenrichtung erstreckende untere Längsfäden gebildet wird, die nur mit unteren Querfäden verwoben sind.In addition to interweaving the binding threads with the upper transverse threads, the upper fabric layer may be formed by upper longitudinal threads extending in the binding yarn direction and woven only with upper transverse threads. Furthermore, in addition to interweaving the binding threads with the lower transverse threads, the lower fabric layer may also be formed by lower longitudinal threads extending in the binding thread direction, which are interwoven only with lower transverse threads.

Eine konkrete Ausgestaltung der Erfindung sieht vor, dass die Querfäden Kettfäden und die Bindefäden bzw. die Längsfäden Schussfäden sind.A concrete embodiment of the invention provides that the transverse threads are warp threads and the binding threads or the longitudinal threads are weft threads.

Nachfolgend soll die Erfindung anhand der folgenden schematischen nicht maßstäblichen Zeichnung weiter erläutert werden. Es zeigt:

Figur 1
einen Bindefadenverlauf eines Bindefadenaares des Papiermaschinensiebs der Figur 2,
Figur 2
einen Gesamtrapport eines erfindungsgemäßen Papiermaschinensiebs in Bindefaden-Richtung,
Figur 3
Figuren 3a bis 3d jeweils den Verlauf eines Bindefadenpaares weiterer erfindungsgemäßer Ausführungsbeispiele.
The invention will be further elucidated on the basis of the following schematic non-scale drawing. It shows:
FIG. 1
a binding thread course of a binding filament of the papermaking wire of FIG. 2 .
FIG. 2
a total repeat of a papermaker's fabric according to the invention in binder thread direction,
FIG. 3
FIGS. 3a to 3d in each case the course of a pair of binder threads of further inventive embodiments.

Die Figur 2 zeigt einen gesamten Rapport einer Ausführungsform eines erfindungsgemäßen als Formiersieb ausgebildeten Papiermaschinensiebs 100 Die Figur 1 stellt einen Bindefadenverlauf eines Bindefadenpaares des Siebs 100 dar.The FIG. 2 shows an entire repeat of an embodiment of a forming machine according to the invention as a papermaking fabric 100 The FIG. 1 represents a binding thread course of a binding thread pair of the screen 100.

Das Formiersieb 100 umfasst eine obere Gewebelage 101 mit einer die Papierseite bildenden Außenseite 103 und eine untere Gewebelage 102 mit einer die Maschinenseite bildenden Außenseite 104.The forming fabric 100 comprises an upper fabric layer 101 having an outer side 103 forming the paper side and a lower fabric layer 102 having an outer side 104 forming the machine side.

In der dargestellten Ausführungsform wird die obere Gewebelage 101 durch das Verweben von in Paaren angeordneten Bindefäden B1 bis B20 mit oberen Querfäden OK1, OK3, OK5, OK7, ....bis OK 39 sowie durch das Verweben von oberen Längsfäden OS1 bis OS10 mit den oberen Querfäden OK1, OK3, OK5, OK7, ....bis OK 39 gebildet (die in der Figur 1 bzw. 3 rechtsseitigen Bezeichnungen "OK" bzw. "UK" sollen stellvertretend für alle oberen bzw. unteren Querfäden verwendet werden).In the illustrated embodiment, the upper fabric layer 101 is formed by interweaving pairs of binding yarns B1 to B20 with upper transverse yarns OK1, OK3, OK5, OK7, .... to OK39, and interweaving upper longitudinal yarns OS1 to OS10 with the upper one upper transverse threads OK1, OK3, OK5, OK7, .... to OK 39 formed (which in the FIG. 1 or 3 right-hand designations "OK" or "UK" should be used as a substitute for all upper or lower transverse threads).

Des weiteren wird die untere Gewebelage 102 durch das Verweben der in Paaren angeordneten Bindefäden B1 bis B20 mit unteren Querfäden UK2, UK4, UK6, UK8, ...., UK40 sowie durch das Verweben von unteren Längsfäden US1 bis US20 mit den unteren Querfäden UK2, UK4, UK6, UK8, ...., UK40 gebildet.Further, the lower fabric layer 102 is formed by interweaving the paired binding yarns B1 to B20 with lower transverse threads UK2, UK4, UK6, UK8, ...., UK40 and interweaving lower longitudinal threads US1 to US20 with the lower transverse threads UK2 , UK4, UK6, UK8, ...., UK40.

Eine Wiederholeinheit der erfindungsgemäßen Ausführungsform umfasst demzufolge 20 Bindefäden, 30 obere und untere Längsfäden sowie 40 obere und untere Querfäden. Das Verhältnis von oberen zu unteren Querfäden 1:1 ist.A repeat unit of the embodiment according to the invention therefore comprises 20 binding threads, 30 upper and lower longitudinal threads and 40 upper and lower transverse threads. The ratio of upper to lower transverse threads is 1: 1.

Das Webmuster der oberen Gewebelage 101 bildet des weiteren eine Leinwandbindung aus.The weave pattern of the upper fabric layer 101 further forms a plain weave.

Exemplarisch soll die Erfindung im wesentlichen anhand der Verläufe der Bindefäden B19 und B20 in der Figur 1 bzw. 2 erläutert werden.By way of example, the invention is based essentially on the course of the binding threads B19 and B20 in the FIG. 1 or 2 will be explained.

Die Bindefäden B1 bis B20 und die Längsfäden OS1 bis OS10 und US1 bis US20 erstrecken sich hierbei quer zu den oberen und unteren Querfäden.The binding threads B1 to B20 and the longitudinal threads OS1 to OS10 and US1 to US20 in this case extend transversely to the upper and lower transverse threads.

Durch die Bindefäden B19 und B20 wird die obere Gewebelage 101 und die untere Gewebelage 102 miteinander verbunden, indem die Bindefäden B19 und B20 jedes Paares mit oberen Querfäden OK1, OK3, OK5, OK7, ....bis OK 39 unter Ausbildung von oberen Anbindungsabschnitten OA1 bis OA6 und mit unteren Querfäden UK2, UK4, UK6, UK8, ...., UK40 unter Ausbildung von unteren Anbindungsabschnitten UA1 bis UA4 verwoben sind, wobei jeder obere Anbindungsabschnitt OA1 bis OA6 durch das Verweben eines Bindefadens B19, B20 des Paares mit einem oder mehreren aufeinander folgenden oberen Querfäden OK1, OK3, OK5, OK7, ....bis OK 39 gebildet wird und zwischen zwei aufeinander folgenden oberen Anbindungsabschnitten des Bindefadens ein oberer Anbindungsabschnitt des anderen Bindefadens des Paares angeordnet ist. So ist bspw. zwischen den aufeinander folgenden oberen Anbindungsabschnitten OA2 und OA4 des Bindefadens B19 der obere Anbindungsabschnitt OA3 des Bindefadens B20 angeordnet.By the binding threads B19 and B20, the upper fabric layer 101 and the lower Fabric layer 102 interconnected by the binding threads B19 and B20 of each pair with upper transverse threads OK1, OK3, OK5, OK7, .... to OK 39 to form upper attachment portions OA1 to OA6 and lower transverse threads UK2, UK4, UK6, UK8 , ...., UK40 are interwoven to form lower attachment portions UA1 to UA4, wherein each upper attachment portion OA1 to OA6 is formed by interweaving a binding thread B19, B20 of the pair with one or more successive upper transverse threads OK1, OK3, OK5, OK7 , .... to OK 39 is formed and between two successive upper attachment portions of the binding thread, an upper attachment portion of the other binding thread of the pair is arranged. For example, between the successive upper attachment sections OA2 and OA4 of the binding thread B19, the upper attachment section OA3 of the binding thread B20 is arranged.

Beim dargestellten Formiersieb 100 sind die Querfäden OK1, OK3, OK5, OK7, ....bis OK 39 und UK2, UK4, UK6, UK8, ...., UK40 Kettfäden und die Bindefäden B19 und B20 Schussfäden.In the illustrated forming fabric 100 are the transverse threads OK1, OK3, OK5, OK7, .... to OK 39 and UK2, UK4, UK6, UK8, ...., UK40 warp threads and the binding threads B19 and B20 weft threads.

Ein oberer Anbindungsabschnitt OA1 bis OA6 wird hierbei dadurch gebildet, indem ein Bindefaden B19, B20 auf der Außenseite 103 der oberen Gewebelage 101 laufend zumindest einen der oberen Querfaden OK1, OK3, OK5, OK7, ....bis OK 39 kreuzt.An upper attachment section OA1 to OA6 is formed by a binding thread B19, B20 on the outer side 103 of the upper fabric layer 101 continuously crossing at least one of the upper transverse threads OK1, OK3, OK5, OK7, .... to OK 39.

So werden bspw. die oberen Anbindungsabschnitte OA2 und OA6 durch das Verweben von jeweils drei aufeinander folgenden oberen Querfäden(OK7 bis OK11 bei OA2 und OK35 bis OK39 bei OA6) mit dem Bindefaden B19 gebildet, wobei der Bindefaden B19 auf der Außenseite 103 der oberen Gewebelage 101Iaufend den ersten und den dritten der oberen Querfäden kreuzt und wobei der Bindefaden B19 zwischen der oberen 101 und unteren Gewebelage 102 laufend den zweiten der oberen Querfäden kreuzt.Thus, for example, the upper attachment portions OA2 and OA6 are formed by interweaving three successive upper transverse threads (OK7 to OK11 at OA2 and OK35 to OK39 at OA6) with the binder thread B19, the binder thread B19 at the outer side 103 of the upper fabric layer 101, the first and third of the upper transverse threads cross, and the binder thread B19 between the upper 101 and lower fabric layers 102 continuously crosses the second of the upper transverse threads.

Die oberen Anbindungsabschnitte OA3 und OA5 werden des weiteren durch das Verweben des Bindefadens B20 mit jeweils drei aufeinander folgenden oberen Querfäden(OK15 bis OK19 bei OA3 und OK27 bis OK31 bei OA5) gebildet.The upper connection sections OA3 and OA5 are further characterized by the Weaving the binding thread B20 formed with three consecutive upper transverse threads (OK15 to OK19 at OA3 and OK27 to OK31 at OA5).

Die oberen Anbindungsabschnitte OA2, OA3, OA5 und OA6 stellen zweite obere Anbindungsabschnitte dar.The upper attachment sections OA2, OA3, OA5 and OA6 represent second upper attachment sections.

Des weiteren werden erste obere Anbindungsabschnitte OA1 und OA4 durch das Verweben von jeweils einem oberen Querfaden(OK3 bei OA1 und OK23 bei OA4) mit dem Bindefaden B20 bzw. B19 gebildet.Further, first upper bonding portions OA1 and OA4 are formed by interweaving each upper transverse thread (OK3 at OA1 and OK23 at OA4) with the bonding yarns B20 and B19, respectively.

Wie insbesondere aus der Figur 2 zu erkennen ist, wiederholt sich das Webmuster des Papiermaschinensiebs 100 in einem Rapport OK1 bis OK39 und UK2 bis UK40, der sich in Bindefadenrichtung über die Länge der Wiederholung des Webpfads eines der Bindefäden B19 oder B20 erstreckt. Erfindungsgemäß sind auf der Länge des Rapports OK1 bis OK39 und UK2 bis UK40 in Bindefadenrichtung aufeinander folgend mehr als zwei obere Anbindungsabschnitte, im konkreten Fall sechs obere Anbindungsabschnitte OA1 bis OA6 angeordnetAs in particular from the FIG. 2 As can be seen, the weave pattern of the papermaker's fabric 100 repeats in a repeat OK1 to OK39 and UK2 to UK40 extending in the binder threading direction along the length of the repeat of the weaving path of one of the binding threads B19 or B20. According to the invention, more than two upper connecting sections, in each case six upper connecting sections OA1 to OA6, are arranged consecutively on the length of the repeat OK1 to OK39 and UK2 to UK40 in the direction of the binding thread

Das Formiersieb 100 weist des weiteren untere Anbindungsabschnitte UA1 bis UA4 auf, wobei bei jedem unteren Anbindungsabschnitt UA1 bis UA4 ein Bindefaden B19, B20 zumindest einen unteren Querfaden kreuzt, wenn der Bindefaden B19, B20 auf der Außenseite 104 der unteren Gewebelage 102 läuft.The forming fabric 100 further has lower attachment portions UA1 to UA4, wherein at each lower attachment portion UA1 to UA4, a binding thread B19, B20 crosses at least one lower transverse thread when the binding thread B19, B20 runs on the outer side 104 of the lower fabric layer 102.

Wie insbesondere aus der Figur 1 zu erkennen ist, unterscheiden sich die Webpfade der beiden Bindefäden B19, B20 des Paares nur dadurch voneinander, dass diese zueinander um eine Anzahl von oberen Querfäden versetzt sind, nämlich um die oberen Querfäden OK5 bis OK23, was der Hälfte des Bindefadenrapports entspricht.As in particular from the FIG. 1 it can be seen, the weaving paths of the two binding threads B19, B20 of the pair differ from each other only in that they are offset from each other by a number of upper transverse threads, namely the upper transverse threads OK5 to OK23, which corresponds to half of the binder thread repeat.

Wie aus der Figur 1 weiter zu erkennen ist, weist das Formiersieb 100 aufeinander folgende durch einen Bindefaden des Paares gebildete zweite obere Anbindungsabschnitte auf, zwischen denen der Bindefaden nicht mit unteren Querfäden verwoben ist. Beispielsweise ist der Bindefaden B20 zwischen den durch ihn gebildeten zweiten oberen Anbindungsabschnitten OA3 und OA5 nicht mit unteren Querfäden UA verwoben, sondern vielmehr kreuzt der Bindefaden B20 zwischen den aufeinander folgenden zweiten oberen Anbindungsabschnitten OA3 und OA5 zwischen der oberen Gewebelage 101 und unteren Gewebelage 102 laufend die drei aufeinander folgenden oberen Querfäden OK21 bis OK25.Like from the FIG. 1 can be seen, the forming fabric 100 has successive formed by a binder yarn of the pair second upper connecting portions, between which the binding yarn is not interwoven with lower transverse threads. For example, the binding thread B20 between the through The second upper joining portions OA3 and OA5 formed thereon are not interwoven with lower transverse threads UA, but rather, the binder thread B20 between the successive second upper joining portions OA3 and OA5 between the upper fabric layer 101 and lower fabric layer 102 continuously crosses the three successive upper transverse threads OK21 to OK25 ,

Des weiteren ist zwischen den aufeinander folgenden zweiten oberen Anbindungsabschnitten eine durch das Verweben des anderen Bindefadens mit einem oberen Querfaden des Paares ausgebildeter erster oberer Anbindungsabschnitt angeordnet. So ist bspw. zwischen den beiden zweiten oberen Anbindungsabschnitten OA3 und OA5 des Bindefadens B20 der durch das Verweben des Bindefadens B19 mit dem oberen Querfaden OK23 gebildete erste obere Anbindungsabschnitt OA4 angeordnet.Further, between the successive second upper attachment portions, a first upper attachment portion formed by interweaving the other binding thread with an upper transverse thread of the pair is arranged. Thus, for example, between the two second upper connecting sections OA3 and OA5 of the binding thread B20, the first upper connecting section OA4 formed by interweaving the binding thread B19 with the upper transverse thread OK23 is arranged.

Des weiteren umfasst das Formiersieb 100 aufeinander folgend angeordnete erste und zweite obere Anbindungsabschnitte eines Bindefadens, zwischen denen ein unterer Anbindungsabschnitt des selben Bindefadens angeordnet ist. Bspw. folgt der zweite obere Anbindungsabschnitt OA3 des Bindefadens B20 dem ersten Bindefadenabschnitt OA1 des Bindefadens B20, wobei zwischen den beiden oberen Anbindungsabschnitten OA1 und OA3 der untere Anbindungsabschnitt UA1 des Bindefadens B20 angeordnet ist.Furthermore, the forming fabric 100 comprises successively arranged first and second upper attachment portions of a binding thread, between which a lower attachment portion of the same binding thread is arranged. For example. the second upper attachment portion OA3 of the binding thread B20 follows the first binding thread portion OA1 of the binding thread B20, wherein the lower attachment portion UA1 of the binding thread B20 is arranged between the two upper attachment portions OA1 and OA3.

Das Formiersieb 100 weist des weiteren aufeinander folgende durch einen Bindefaden des Paares gebildete untere Anbindungsabschnitte auf, zwischen denen der Bindefaden mit einem oberen Querfaden unter Ausbildung eines ersten oberen Anbindungsabschnitts verwoben ist. So ist bspw. zwischen den beiden unteren Anbindungsabschnitten UA2 und UA3 des Bindefadens B19 der erste obere Anbindungsabschnitt OA4 des Bindefadens B19 angeordnet, so dass der zwischen den beiden zweiten oberen Anbindungsabschnitten OA3 und OA5 angeordnete erste obere Anbindungsabschnitt beidseitig von den unteren Anbindungsabschnitten UA2 und UA3 gehalten wird.The forming fabric 100 further comprises successive lower attachment portions formed by a binder yarn of the pair, between which the binder yarn is interwoven with an upper transverse yarn to form a first upper attachment portion. Thus, for example, the first upper connection section OA4 of the binding thread B19 is arranged between the two lower attachment sections UA2 and UA3 of the binding thread B19, so that the first upper attachment section arranged between the two second upper attachment sections OA3 and OA5 is held on both sides by the lower attachment sections UA2 and UA3 becomes.

Bei der in der Figur 3a gezeigten Ausführungsform sind erste und zweite obere Anbindungsabschnitte vorgesehen, die die gleiche Anzahl von oberen Querfäden, nämlich jeweils drei aufeinanderfolgende obere Querfäden, umfassen.When in the FIG. 3a In the embodiment shown, first and second upper connecting sections are provided which comprise the same number of upper transverse threads, namely three successive upper transverse threads.

Bei der in der Figur 3b gezeigten Ausführungsform umfassen die ersten oberen Anbindungsabschnitte jeweils einen oberen Querfaden ,wohingegen die zweiten oberen Anbindungsabschnitte jedes Bindefadens drei und fünf aufeinander folgende obere Querfäden umfassen.When in the FIG. 3b In the embodiment shown, the first upper attachment portions each comprise an upper transverse thread, whereas the second upper attachment portions of each binding thread comprise three and five successive upper transverse threads.

Bei der in der Figur 3c gezeigten Ausführungsform sind erste und zweite obere Anbindungsabschnitte vorgesehen, die die gleiche Anzahl von oberen Querfäden, nämlich jeweils einen oberen Querfaden, umfassen.When in the Figure 3c In the embodiment shown, first and second upper connecting sections are provided which comprise the same number of upper transverse threads, namely one upper transverse thread each.

Alle in den Figuren 3a-c gezeigten Ausführungsformen weisen ein Verhältnis von oberen zu unteren Querfäden von 1:1 auf.All in the FIGS. 3a-c embodiments shown have a ratio of upper to lower transverse threads of 1: 1.

Die in der Figur 3d gezeigte Ausführungsform ist ähnlich zu der der Figur 3b mit dem wesentlichen Unterschied, dass diese ein Verhältnis von oberen zu unteren Querfäden von 3:2 hat.The in the 3d figure embodiment shown is similar to that of FIG. 3b with the essential difference that this has a ratio of upper to lower transverse threads of 3: 2.

Claims (19)

  1. Paper machine fabric (100), in particular a forming fabric,
    - having an upper woven layer (101) comprising upper transverse yarns (OK), the outer side of which forms a paper side of the paper machine fabric (100),
    - having a lower woven layer (102) comprising lower transverse yarns (UK), the outer side of which forms a machine side of the paper machine fabric (100), and
    - having binding yarns (B1 - B20) arranged in pairs and extending transversely in relation to the transverse yarns (OK, UK), which join the upper woven layer (101) and the lower woven layer (102) to each other, in that the binding yarns (B1
    - B20) of each pair are woven with upper transverse yarns (OK), forming upper attachment sections (OA1 - OA6), and with lower transverse yarns (UK), forming lower attachment sections (UA1-UA4), each upper attachment section (OA1 - OA6) being formed by weaving a binding yarn (B1 - B20) of the pair with one or more successive upper transverse yarns (OK) and, between two successive upper binding sections (OA1, OA3, OA5) at the binding yarn, there being arranged an upper binding section (OA2, OA4, OA6) of the other binding yarn of the pair, in each upper binding section (OA1 - OA6) a binding yarn (B1 - B20) crossing at least one upper transverse yarn (OK) if the binding yarn (B1 - B20) runs on the outside of the upper woven layer (101), and in each lower binding section (UA1 - UA4) a binding yarn (B1 - B20) crossing at least one lower transverse yarn (UK) if it runs on the outside of the lower woven layer (102), the upper binding sections (OA1 - OA6) forming first binding sections (OA1, OA4) and second binding sections (OA2, OA3, OA5, OA6), of which the second binding sections (OA2, OA3, OA5, OA6) comprise as many successive upper transverse yarns (OK) as or more than the first upper binding sections (OA1, OA4), and second upper binding sections (OA3, OA5) formed by a binding yarn of the pair being provided, between which the binding yarn (B20) is not woven with lower transverse yarns (UK), and
    - having binding yarn repeats, in which in each case the weaving of the binding yarns (B1 - B20) with upper transverse yarns (OK) and lower transverse yarns (UK) is repeated, in each binding yarn repeat there being arranged more than two successive upper binding sections (OA1 - OA6),
    characterized in that
    the weaving paths of the two binding yarns (B19, B20) differ from each other only in that these are offset in relation to each other by a number of upper transverse yarns (OK).
  2. Paper machine fabric according to Claim 1,
    characterized in that
    four or more, in particular six, upper binding sections (OA1 - OA6) are arranged in each binding yarn repeat.
  3. Paper machine fabric according to Claim 1 or 2,
    characterized in that
    the weaving pattern of the upper woven layer (101) is a basket weave.
  4. Paper machine fabric according to one of Claims 1 - 3,
    characterized in that
    the weaving paths of the two binding yarns (B1 - B20) of a pair are offset in relation to each other by half the binding yarn repeat.
  5. Paper machine fabric according to one of Claims 1 - 4,
    characterized in that
    the first upper binding sections (OA1, OA4) comprise one and the second upper binding sections (OA2, OA3, OA4, OA5) comprise two or more successive upper transverse yarns (OK).
  6. Paper machine fabric according to one of Claims 1 to 5,
    characterized in that
    the second binding sections (OA2, OA3, OA4, OA5) comprise three successive upper transverse yarns (OK), the binding yarn (B1 - B20) running on the outside crossing the first and the third of the upper transverse yarns, and the binding yarn (B1 - B20) running between the upper (101) and lower woven layer (102) crossing the second of the upper transverse yarns.
  7. Paper machine fabric according to one of Claims 1 to 6,
    characterized in that
    over the length of the binding yarn repeat there are arranged two first upper binding sections (OA1, OA4) and four second upper binding sections (OA2, OA3, OA4, OA5).
  8. Paper machine fabric according to one of Claims 1 to 7,
    characterized in that,
    between successive second upper binding sections (OA2, OA3, OA4, OA5), the binding yarn (B1 - B20) running between the upper (101) and lower woven layer (102) crosses a plurality of transverse yarns (OK), preferably three upper transverse yarns (OK).
  9. Paper machine fabric according to one of Claims 1 to 8,
    characterized in that,
    between the successive second upper binding sections (OA2, OA3, OA4, OA5), the other binding yarn of the pair forms a first upper binding section (OA1, OA4) as a result of weaving with at least one upper transverse yarn.
  10. Paper machine fabric according to one of Claims 1 to 9,
    characterized in that,
    as a result of the weaving of a binding yarn (B1 - B20) of the pair with upper (OK) and lower transverse yarns (UK), successively arranged first (OA1, OA4) and second upper binding sections are formed, between which there is arranged a lower binding section (OA2, OA3, OA4, OA5).
  11. Paper machine fabric according to one of Claims 1 to 10,
    characterized in that
    successive lower binding sections (UA1 - UA4) formed by a binding yarn (B1 - B20) of the pair are provided, between which the binding yarn (B1 - B20) is woven with an upper transverse yarn (OK), forming a first upper binding section (OA1, OA4).
  12. Paper machine fabric according to one of Claims 1 to 11,
    characterized in that
    the lower binding sections (UA1 - UA4) are formed by weaving a binding yarn (B1 - B20) with only one lower transverse yarn.
  13. Paper machine fabric according to one of Claims 1 to 12
    characterized in that
    when a binding yarn (B1 - B20) is woven with upper transverse yarns, forming a second upper binding section (OA2, OA3, OA5, OA6), the other binding yarn of the pair is woven with lower transverse yarns (UK), forming a lower binding section (UA).
  14. Paper machine fabric according to one of Claims 1 to 13,
    characterized in that
    a binding yarn repeat comprises 40 transverse yarns.
  15. Paper machine fabric according to one of Claims 1 to 14,
    characterized in that
    the ratio of upper to lower transverse yarns is 1:1.
  16. Paper machine fabric according to one of Claims 1 to 15,
    characterized in that
    the upper woven layer (101) is additionally formed by upper longitudinal yarns (OS1 - OS10) extending in the binding yarn direction, which are woven only with upper transverse yarns (OK), and/or in that the lower woven layer (102) is additionally formed by lower longitudinal yarns (US1 - US20) extending in the binding yarn direction, which are woven only with lower transverse yarns (UK).
  17. Paper machine fabric according to Claim 16,
    characterized in that
    the fabric (100) comprises more lower than upper longitudinal yarns, in particular twice as many lower as upper longitudinal yarns.
  18. Paper machine fabric according to Claim 17,
    characterized in that
    the fabric comprises 10 upper longitudinal yarns and 20 lower longitudinal yarns.
  19. Paper machine fabric according to one of Claims 1 to 18,
    characterized in that
    the transverse yarns (OK) are warp yarns and the binding yarns (B1 - B20) and the longitudinal yarns (OS1 - OS10, US1 - US20) are weft yarns.
EP06122409A 2005-11-21 2006-10-17 Papermaking fabric Not-in-force EP1788151B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005055785A DE102005055785A1 (en) 2005-11-21 2005-11-21 papermaker

Publications (2)

Publication Number Publication Date
EP1788151A1 EP1788151A1 (en) 2007-05-23
EP1788151B1 true EP1788151B1 (en) 2010-01-06

Family

ID=37671051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06122409A Not-in-force EP1788151B1 (en) 2005-11-21 2006-10-17 Papermaking fabric

Country Status (5)

Country Link
US (1) US7575026B2 (en)
EP (1) EP1788151B1 (en)
AT (1) ATE454494T1 (en)
DE (2) DE102005055785A1 (en)
ES (1) ES2337078T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014212306A1 (en) * 2014-06-26 2015-12-31 Voith Patent Gmbh covering

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CA1277209C (en) * 1986-11-28 1990-12-04 Dale B. Johnson Composite forming fabric
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DE3923938A1 (en) * 1989-07-19 1991-01-31 Oberdorfer Fa F FORMING FABRICS FOR THE WET SECTION OF A PAPER MACHINE
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Also Published As

Publication number Publication date
US7575026B2 (en) 2009-08-18
ES2337078T3 (en) 2010-04-20
US20070113914A1 (en) 2007-05-24
DE502006005830D1 (en) 2010-02-25
DE102005055785A1 (en) 2007-05-24
ATE454494T1 (en) 2010-01-15
EP1788151A1 (en) 2007-05-23

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