EP0263527B1 - Fabric for the wet end of a paper-making machine, with additional cross-machine floating strands having a larger harness - Google Patents

Fabric for the wet end of a paper-making machine, with additional cross-machine floating strands having a larger harness Download PDF

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Publication number
EP0263527B1
EP0263527B1 EP87114756A EP87114756A EP0263527B1 EP 0263527 B1 EP0263527 B1 EP 0263527B1 EP 87114756 A EP87114756 A EP 87114756A EP 87114756 A EP87114756 A EP 87114756A EP 0263527 B1 EP0263527 B1 EP 0263527B1
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EP
European Patent Office
Prior art keywords
threads
transverse threads
fabric
additional
paper
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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
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EP87114756A
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German (de)
French (fr)
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EP0263527A1 (en
Inventor
Georg Dipl.-Ing. Borel
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Herman Wangner GmbH and Co KG
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Herman Wangner GmbH and Co KG
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Priority to AT87114756T priority Critical patent/ATE62947T1/en
Publication of EP0263527A1 publication Critical patent/EP0263527A1/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
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/903—Paper forming member, e.g. fourdrinier, sheet forming member

Definitions

  • the invention relates to a covering for the sheet-forming part of a paper machine with a double-layer or multi-layer fabric made of interwoven longitudinal threads and transverse threads and with additional transverse threads floating on the paper side.
  • the additional sheet threads floating on the paper side are said to improve sheet removal, reduce the risk of marking and increase permeability.
  • the additional transverse threads are woven in such a way that they are bent as little as possible. As a result, however, they protrude so far on the paper side that they interfere with sheet formation. When cleaning the fabric with high-pressure water jets, protruding threads are often destroyed.
  • the invention has for its object to provide a covering of the type mentioned for the sheet formation area of a paper machine, in which the risk of destruction of transverse threads is reduced when cleaning with high pressure water jets.
  • the additional transverse threads have a greater repeat length than the normal transverse threads and float alternately in one weave repeat on the paper side and are not visible on the paper side in the next weave repeat.
  • the additional transverse threads are preferably woven in pairs in opposite directions, that is, in one weave repeat, one additional transverse thread of a pair floats on the paper side, while the other runs inside the fabric, and in the next repeat weave, the course is opposite, that is, the other floats on the paper side, while one runs inside the tissue.
  • the additional, floating cross threads are preferably made of particularly soft, easy-to-stretch material and have a smaller diameter than the normal cross threads.
  • the covering can be flat or endlessly woven. If the covering is woven flat, it is made endless by a woven seam.
  • the threads consist of plastic monofilaments, a material with a higher modulus of elasticity being generally chosen for the longitudinal threads than for the transverse threads.
  • the threads can also consist of plastic multifilaments.
  • FIG. 5 shows the weave cartridge of the base fabric (without additional transverse threads from example 1, the arrow indicating the direction of the warp or longitudinal threads, the black filled boxes mean that the chain is visible on the paper side, the weft at the other crossing points on the paper side - or cross threads are visible and the cross in some of the boxes again indicates that the chain is visible on the running side, that is to say runs under a pair of weft wires, and Fig. 6 shows the course of the longitudinal thread in Example 1, the additional transverse threads are also omitted.
  • Fig. 1 shows in cross section a double-layer, seven-shaft fabric.
  • a double-layer fabric is understood here to mean a fabric that contains two layers of transverse threads that are interwoven with a system of longitudinal threads. The top or paper side of the fabric is formed by interwoven longitudinal threads 1 and upper transverse threads 2. Each upper transverse thread 2 is assigned a lower transverse thread 5, so that the transverse threads are arranged in pairs. The longitudinal threads 1 are also interwoven with the lower transverse threads 5.
  • the lower transverse threads 5 have very long floats which project downwards and form the running side of the paper machine clothing. Since the lower transverse threads 5 are particularly strongly exposed to abrasion, they expediently have a larger diameter than the upper transverse threads 2 and partially consist of a particularly abrasion-resistant material, e.g. Alternating polyamide and polyester.
  • the fabric contains additional transverse threads 3, which are alternately woven in with the normal transverse threads 2 of the upper layer.
  • the additional transverse threads 3 differ in the weave pattern from the normal transverse threads 2 of the upper layer and have a greater repeat length, ie the pattern of their integration is repeated at greater intervals than that of the normal transverse threads 2.
  • the additional transverse threads 3 twice the repeat length as the upper transverse threads 2, ie the base fabric.
  • the additional transverse threads 3 are woven in such a way that they are visible in a weave repeat of the base fabric of the longitudinal threads 1 and transverse threads 2 and 5 on the paper side 4, lie monoplane with the offsets of the upper transverse threads 2 and contribute to the support of the sheet being formed while they are being formed run in the next repeat of the basic fabric inside the fabric. Since the embodiment of FIGS. 1 and 2 is a seven-strand base fabric, this means that the additional transverse threads 3 float on the paper side over six longitudinal threads 1 and then run inside the fabric over a distance that spans eight longitudinal threads 1.
  • the additional transverse threads 3 consist of relatively soft material with a low modulus of elasticity, e.g. the same material as the upper cross threads 2, but have a smaller diameter.
  • the embodiment of Fig. 1 has a seven-strand weave of the base fabric, i.e. each weave repeat contains seven longitudinal threads 1 and seven normal transverse threads 2 and 5, respectively, of the upper and lower layers. In addition, each weave repeat contains seven additional transverse threads 3.
  • FIG. 2 shows a top view of the paper side of the fabric, in particular the pronounced weave diagonal D1, which runs from top left to bottom right in FIG. 2. All offsets of the longitudinal threads 1 and the normal upper transverse threads 2 and the additional transverse threads 3 are arranged along this binding diagonal D1. The floats of the additional transverse threads 3 are offset such that they are not all in one weave diagonal, but are distributed over two adjacent weave diagonals. 2 shows a rough structuring in a further bond diagonal D 2, which runs from top right to bottom left. Surprisingly, this binding diagonal D2 does not mark the paper. It is even the case that the marking becomes smaller because the density of the transverse thread floats along the first weave diagonal D1 has been reduced.
  • Figures 3 and 4 show an embodiment in which the additional transverse threads 3 are woven in pairs in opposite directions.
  • the weave of the base fabric is the same as in the embodiment of FIGS. 1 and 4, and therefore only the integration of the additional transverse threads 3 is shown in FIG. 3.
  • the one additional transverse thread 3a of a pair has a paper-supporting float on the paper side 4 over a length that spans a weave repeat of seven longitudinal threads 1, then runs over the same length inside the fabric, while the other, woven in at the same place Transverse thread 3b of this pair initially runs inside the fabric and then only runs a distance spanning the repeat of seven longitudinal threads 1 on the paper side 4. As shown in FIG. 4, all the binding diagonals are then completely filled in by the additional transverse threads 3.
  • FIGS. 1 and 3 lie in a different vertical plane than the normal transverse threads 2 and 5 of the fabric.
  • the figures are a section in the plane of the additional transverse threads 3, so that the visible cross sections of the longitudinal threads 1 also apply to this plane.
  • the course of the normal transverse threads 2 and 5 visible in the background appears as if these transverse threads 2, 5 would pass through the longitudinal threads 1.
  • the longitudinal threads 1 have a different position at the intersection with the normal transverse threads 2 and 5 than the cross section of the longitudinal threads 1 shown.
  • the additional transverse threads 3 are firmly integrated in the sense that at least some of the longitudinal threads 1, which lie over an additional transverse thread 3, then run under one or both of the adjacent normal transverse threads 2.
  • the additional transverse threads 3 are preferably thinner than the normal transverse threads 2 of the upper layer. Since they are strongly integrated by the longitudinal threads 1 and run deep in the interior of the fabric in every second weave repeat of the base fabric, the additional transverse threads 3 are preferably made of soft polyester or polyamide material. This has the advantage of greater resistance when cleaning the paper machine clothing with high pressure water jets. Materials other than polyester or polyamide can also be used for the additional transverse threads, e.g. Polypropylene or polyvinylidene fluoride (Kynar). If special marking effects are to be achieved, floats of additional transverse threads of different diameters and different materials can be arranged along the binding diagonal D1 in order to break the monotony of the marking impression.
  • a 14-strand weave (seven-strand base fabric) is produced with a warp course, in which a chain runs over two pairs of wefts, between one pair of wefts, under one pair of wefts and between three pairs of wefts, and the warp floats on the paper side have a seven-strand satin distribution, as in the Figures 5 and 6 shown.
  • the weave of the base fabric has seven strands, and the additional weft wires 3 are not bound in every seven-strand repeat by the chain 1, but run according to FIGS. 1 and 2 within a seven-strand repeat on the paper side 4 and then the seven-strand repeat in the interior of the fabric .
  • the lower weft wires 5 consist alternately of polyester and polyamide.
  • the warp wires 1, the normal weft wires 2 and the additional weft wires are all in one plane.
  • the normal weft 5 is 8/100 mm lower than the chain, i.e. the paper machine clothing is a weft runner. Further information on the threads used can be found in the table.
  • the fabric has a finely structured surface (paper page 4). It is mainly used for the production of marking-sensitive writing and printing papers. It would be expected that due to the irregularity of the structure in the direction of the right-left diagonal D2, this tissue would be marked more. Surprisingly, however, this was not the case, presumably because the accumulation of the shot floats along the left-right diagonal D1 is interrupted by missing shot floats. This is in contrast to the experience that normally the diagonal is most marked.
  • the basic fabric is the same as in example 1.
  • the additional weft wires 3 are woven in pairs, as shown in FIGS. 3 and 4.
  • the two additional weft wires 3a and 3b of each pair are made of different materials, as in the following Specified table.
  • the additional weft wires 3a and 3b are arranged in such a way that floats made of polyester and polyamide alternate on the paper side 4 along the binding diagonal D1.

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  • Paper (AREA)
  • Woven Fabrics (AREA)

Description

Die Erfindung betrifft eine Bespannung für den Blattbildungsteil einer Papiermaschine mit einem doppellagigen oder mehrlagigen Gewebe aus miteinander verwobenen Längsfäden und Querfäden und mit zusätzlichen, auf der Papierseite flottierenden Querfäden.The invention relates to a covering for the sheet-forming part of a paper machine with a double-layer or multi-layer fabric made of interwoven longitudinal threads and transverse threads and with additional transverse threads floating on the paper side.

Papiermaschinenbespannungen mit zusätzlichen, auf der Papierseite flottierenden Querfäden sind aus US-A-4,182,381 und 4,281,688 und aus EP-A-85 363 bekannt. Nach US-A-4,182,381 soll durch die zusätzlichen Querfäden die Abnutzung insbesondere im Bereich einer Stecknaht vermindert werden. Nach US-A-4,281,688 werden die Querfäden so eingewoben, daß sich auf der Papierseite und auf der Laufseite gleichlange Flottierungen ergeben, wodurch ein Einrollen der Ränder verhindert werden soll.Paper machine clothing with additional transverse threads floating on the paper side are known from US-A-4,182,381 and 4,281,688 and from EP-A-85 363. According to US Pat. No. 4,182,381, the additional transverse threads are intended to reduce wear, particularly in the area of a pin seam. According to US-A-4,281,688, the transverse threads are woven in such a way that floats of the same length result on the paper side and on the running side, thereby preventing the edges from curling up.

Nach EP-A-85 363 soll durch die zusätzlichen, auf der Papierseite flottierenden Querfäden die Blattabnahme verbessert, die Markierungsgefahr verringert und die Durchlässigkeit vergrößert werden. Die zusätzlichen Querfäden werden dabei so eingewoben, daß sie möglichst wenig abgekröpft werden. Dadurch stehen sie jedoch auf der Papierseite soweit vor, daß sie die Blattbildung stören. Bei der Reinigung des Gewebes durch Hochdruckwasserstrahlen werden herausstehende Fäden häufig zerstört.According to EP-A-85 363, the additional sheet threads floating on the paper side are said to improve sheet removal, reduce the risk of marking and increase permeability. The additional transverse threads are woven in such a way that they are bent as little as possible. As a result, however, they protrude so far on the paper side that they interfere with sheet formation. When cleaning the fabric with high-pressure water jets, protruding threads are often destroyed.

Aus der DE-A-32 24 236 und aus den EP-A-69 101, 93 096 und 117 856 sind Blattbildungssiebe bekannt, bei denen Längsfäden oder Querfäden paarweise eingewoben sind und die Fäden jedes Paares so gegeneinander versetzt, ansonsten in gleicher Weise eingebunden sind, daß auf der Papierseite ein regelmäßiges Bindungsmuster gebildet wird. Falls die paarweise eingebundenen Fäden hierbei zusätzlich zu normal eingebundenen Fäden vorhanden sind, so ergänzen sie sich auf der Papierseite zu der gleichen Bindung wie die normalen Fäden. Die paarweise eingebundenen Fäden haben dabei die Aufgabe, zwei Gewebelagen oder zwei Lagen von Querfäden miteinander zu verbinden.From DE-A-32 24 236 and from EP-A-69 101, 93 096 and 117 856 sheet forming sieves are known in which longitudinal threads or transverse threads are woven in pairs and the threads of each pair are offset against each other, otherwise integrated in the same way are that a regular weave pattern is formed on the paper side. If the threads bound in pairs are present in addition to the normally bound threads, they complement each other on the paper side to the same binding as the normal threads. The threads bound in pairs have the task of connecting two layers of fabric or two layers of transverse threads.

Der Erfindung liegt die Aufgabe zugrunde, eine Bespannung der eingangs genannten Art für den Blattbildungsbereich einer Papiermaschine zu schaffen, bei der die Gefahr einer Zerstörung von Querfäden bei der Reinigung mit Hochdruckwasserstrahlen vermindert ist.The invention has for its object to provide a covering of the type mentioned for the sheet formation area of a paper machine, in which the risk of destruction of transverse threads is reduced when cleaning with high pressure water jets.

Diese Aufgabe wird dadurch gelöst, daß die zusätzlichen Querfäden eine größere Rapportlänge als die normalen Querfäden haben und abwechselnd in einem Bindungsrapport auf der Papierseite flottieren und im nächsten Bindungsrapport nicht auf der Papierseite sichtbar sind.This object is achieved in that the additional transverse threads have a greater repeat length than the normal transverse threads and float alternately in one weave repeat on the paper side and are not visible on the paper side in the next weave repeat.

Vorzugsweise sind die zusätzlichen Querfäden paarweise entgegengesetzt eingewoben, d.h., in einem Bindungsrapport flottiert der eine zusätzliche Querfaden eines Paares auf der Papierseite, während der andere im Gewebeinneren verläuft und im nächsten Bindungsrapport ist der Verlauf entgegengesetzt, d.h., flottiert der andere auf der Papierseite, während der eine im Gewebeinneren verläuft. Vorzugsweise bestehen die zusätzlichen, flottierenden Querfäden aus besonders weichem, dehnungsfreudigem Material und haben sie einen kleineren Durchmesser als die normalen Querfäden.The additional transverse threads are preferably woven in pairs in opposite directions, that is, in one weave repeat, one additional transverse thread of a pair floats on the paper side, while the other runs inside the fabric, and in the next repeat weave, the course is opposite, that is, the other floats on the paper side, while one runs inside the tissue. The additional, floating cross threads are preferably made of particularly soft, easy-to-stretch material and have a smaller diameter than the normal cross threads.

Die Bespannung kann flach oder endlos gewebt sein. Falls die Bespannung flach gewoben ist, wird sie durch eine Webnaht endlos gemacht. Wie üblich bestehen die Fäden aus Kunststoff-Monofilen, wobei für die Längsfäden im allgemeinen ein Material mit höherem Elastizitätsmodul gewählt wird als für die Querfäden. Insbesondere bei endloser Webart können die Fäden jedoch auch aus Kunststoff-Multifilamenten bestehen.The covering can be flat or endlessly woven. If the covering is woven flat, it is made endless by a woven seam. As usual, the threads consist of plastic monofilaments, a material with a higher modulus of elasticity being generally chosen for the longitudinal threads than for the transverse threads. However, especially in the case of an endless weave, the threads can also consist of plastic multifilaments.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung erläutert. Es zeigen:
Fig. 1 und 2 im Schnitt entlang eines zusätzlichen Querfadens bzw. in Draufsicht ein Gewebe mit einem zusätzlichen, in jedem zweiten Rapport auf der Papierseite flottierenden Querfaden;
Fig. 3 und 4 im Schnitt entlang eines zusätzlichen Querfadens bzw. in Draufsicht ein ähnliches Gewebe, wobei die zusätzlichen Querfaden jedoch paarweise entgegengesetzt eingewebt sind;
Fig. 5 die Bindungspatrone des Grundgewebes (ohne zusätzliche Querfäden von Beispiel 1, wobei der Pfeil die Laufrichtung der Kett- oder Längsfäden angibt, die schwarzausgefüllten Kästchen bedeuten, daß die Kette auf der Papierseite sichtbar ist, an den übrigen Kreuzungspunkten auf der Papierseite die Schuß- oder Querfäden sichtbar sind und das Kreuz in einigen der Kästchen wiederum angibt, daß die Kette auf der Laufseite sichtbar ist, also unter einem Schußdrahtpaar verläuft, und
Fig. 6 den Verlauf des Längsfadens in Beispiel 1, wobei ebenfalls die zusätzlichen Querfäden weggelassen sind.Embodiments of the invention are explained below with reference to the drawing. Show it:
1 and 2 in section along an additional transverse thread or in plan view a fabric with an additional transverse thread floating in every second repeat on the paper side;
Figures 3 and 4 in section along an additional transverse thread or in plan view a similar fabric, but the additional transverse thread are woven in pairs in opposite directions;
Fig. 5 shows the weave cartridge of the base fabric (without additional transverse threads from example 1, the arrow indicating the direction of the warp or longitudinal threads, the black filled boxes mean that the chain is visible on the paper side, the weft at the other crossing points on the paper side - or cross threads are visible and the cross in some of the boxes again indicates that the chain is visible on the running side, that is to say runs under a pair of weft wires, and
Fig. 6 shows the course of the longitudinal thread in Example 1, the additional transverse threads are also omitted.

Fig. 1 zeigt im Querschnitt ein doppellagiges, siebenschäftiges Gewebe. Unter doppellagigem Gewebe wird hierbei ein Gewebe verstanden, das zwei Lagen von Querfäden enthält, die mit einem System von Längsfäden verwoben sind. Die Oberseite oder Papierseite des Gewebes wird durch miteinander verwobene Längsfäden 1 und obere Querfäden 2 gebildet. Jedem oberen Querfaden 2 ist ein unterer Querfaden 5 zugeordnet, so daß die Querfäden paarweise angeordnet sind. Die Längsfäden 1 sind auch mit den unteren Querfäden 5 verwoben. Die unteren Querfäden 5 haben sehr lange, nach unten vorstehende Flottierungen, die die Laufseite der Papiermaschinenbespannung bilden. Da die unteren Querfäden 5 besonders stark dem Abrieb ausgesetzt sind, haben sie zweckmäßig einen größeren Durchmesser als die oberen Querfäden 2 und bestehen teilweise aus besonders abriebfestem Material, z.B. Polyamid und Polyester im Wechsel.Fig. 1 shows in cross section a double-layer, seven-shaft fabric. A double-layer fabric is understood here to mean a fabric that contains two layers of transverse threads that are interwoven with a system of longitudinal threads. The top or paper side of the fabric is formed by interwoven longitudinal threads 1 and upper transverse threads 2. Each upper transverse thread 2 is assigned a lower transverse thread 5, so that the transverse threads are arranged in pairs. The longitudinal threads 1 are also interwoven with the lower transverse threads 5. The lower transverse threads 5 have very long floats which project downwards and form the running side of the paper machine clothing. Since the lower transverse threads 5 are particularly strongly exposed to abrasion, they expediently have a larger diameter than the upper transverse threads 2 and partially consist of a particularly abrasion-resistant material, e.g. Alternating polyamide and polyester.

Das Gewebe enthält zusätzliche Querfäden 3, die abwechselnd mit den normalen Querfäden 2 der oberen Lage eingewoben sind. Die zusätzlichen Querfäden 3 weichen im Bindungsmuster von den normalen Querfäden 2 der oberen Lage ab und haben eine größere Rapportlänge, d.h., das Muster ihrer Einbindung wiederholt sich in größeren Abständen als das der normalen Querfäden 2. Bei dem Ausführungsbeispiel von Fig. 1 und 2 haben die zusätzlichen Querfäden 3 die doppelte Rapportlänge wie die oberen Querfäden 2, d.h. das Grundgewebe. Die zusätzlichen Querfäden 3 sind so eingewoben, daß sie in einem Bindungsrapport des Grundgewebes der Längsfäden 1 und Querfäden 2 und 5 auf der Papierseite 4 sichtbar sind, monoplan mit den Abkröpfungen der oberen Querfäden 2 liegen und zur Abstützung des sich bildenden Blattes beitragen, während sie im nächsten Rapport des Grundgewebes im Gewebeinneren verlaufen. Da das Ausführungsbeispiel von Fig. 1 und 2 ein siebenschäftiges Grundgewebe ist, bedeutet dies, daß die zusätzlichen Querfäden 3 auf der Papierseite über sechs Längsfäden 1 hinwegflottieren und dann über eine Strecke, die acht Längsfäden 1 überspannt, im Gewebeinneren verlaufen.The fabric contains additional transverse threads 3, which are alternately woven in with the normal transverse threads 2 of the upper layer. The additional transverse threads 3 differ in the weave pattern from the normal transverse threads 2 of the upper layer and have a greater repeat length, ie the pattern of their integration is repeated at greater intervals than that of the normal transverse threads 2. In the exemplary embodiment of FIGS the additional transverse threads 3 twice the repeat length as the upper transverse threads 2, ie the base fabric. The additional transverse threads 3 are woven in such a way that they are visible in a weave repeat of the base fabric of the longitudinal threads 1 and transverse threads 2 and 5 on the paper side 4, lie monoplane with the offsets of the upper transverse threads 2 and contribute to the support of the sheet being formed while they are being formed run in the next repeat of the basic fabric inside the fabric. Since the embodiment of FIGS. 1 and 2 is a seven-strand base fabric, this means that the additional transverse threads 3 float on the paper side over six longitudinal threads 1 and then run inside the fabric over a distance that spans eight longitudinal threads 1.

Die zusätzlichen Querfäden 3 bestehen aus relativ weichem Material mit niedrigem Elastizitätsmodul, z.B. dem gleichen Material wie die oberen Querfäden 2, haben jedoch einen kleineren Durchmesser. Das Ausführungsbeispiel von Fig. 1 besitzt eine siebenschäftige Bindung des Grundgewebes, d.h., jeder Bindungsrapport enthält sieben Längsfäden 1 und jeweils sieben normale Querfäden 2 bzw. 5 der oberen bzw. unteren Lage. Darüber hinaus enthält jeder Bindungsrapport sieben zusätzliche Querfäden 3.The additional transverse threads 3 consist of relatively soft material with a low modulus of elasticity, e.g. the same material as the upper cross threads 2, but have a smaller diameter. The embodiment of Fig. 1 has a seven-strand weave of the base fabric, i.e. each weave repeat contains seven longitudinal threads 1 and seven normal transverse threads 2 and 5, respectively, of the upper and lower layers. In addition, each weave repeat contains seven additional transverse threads 3.

Fig. 2 zeigt in Draufsicht die Papierseite des Gewebes, wobei insbesondere die ausgeprägte Bindungsdiagonale D1 erkennbar ist, die von links oben nach rechts unten in Fig 2 verläuft. Sämtliche Abkröpfungen der Längsfäden 1 und der normalen oberen Querfäden 2 und der zusätzlichen Querfäden 3 sind entlang dieser Bindungsdiagonale D1 angeordnet. Die Flottungen der zusätzlichen Querfäden 3 sind so versetzt, daß sie nicht alle in einer Bindungsdiagonale liegen, sondern auf zwei benachbarte Bindungsdiagonalen verteilt sind. In Fig. 2 erscheint dadurch eine grobe Strukturierung in einer weiteren Bindungsdiagonale D 2, die von rechts oben nach links unten verläuft. Diese Bindungsdiagonale D2 markiert das Papier erstaunlicherweise nicht. Es ist sogar so, daß die Markierung geringer wird, da die Dichte der Querfadenflottungen entlang der ersten Bindungsdiagonale D1 verringert worden ist.2 shows a top view of the paper side of the fabric, in particular the pronounced weave diagonal D1, which runs from top left to bottom right in FIG. 2. All offsets of the longitudinal threads 1 and the normal upper transverse threads 2 and the additional transverse threads 3 are arranged along this binding diagonal D1. The floats of the additional transverse threads 3 are offset such that they are not all in one weave diagonal, but are distributed over two adjacent weave diagonals. 2 shows a rough structuring in a further bond diagonal D 2, which runs from top right to bottom left. Surprisingly, this binding diagonal D2 does not mark the paper. It is even the case that the marking becomes smaller because the density of the transverse thread floats along the first weave diagonal D1 has been reduced.

Die Figuren 3 und 4 zeigen ein Ausführungsbeispiel, bei dem die zusätzlichen Querfäden 3 paarweise entgegengesetzt eingewoben sind. Die Bindung des Grundgewebes ist die gleiche wie bei dem Ausführungsbeispiel der Figuren 1 und 4 und in Fig. 3 ist daher nur die Einbindung der zusätzlichen Querfäden 3 dargestellt. Der eine zusätzliche Querfaden 3a eines Paares hat dabei auf einer Länge, die einen Bindungsrapport von sieben Längsfäden 1 überspannt, eine papierstützende Flottung auf der Papierseite 4, verläuft anschließend über die gleiche Länge im Inneren des Gewebes, während der andere, an der gleichen Stelle eingewobene Querfaden 3b dieses Paares zunächst im Inneren des Gewebes verläuft und dann erst eine den Rapport von sieben Längsfäden 1 überspannende Strecke auf der Papierseite 4 verläuft. Wie Fig. 4 zeigt, sind dann sämtliche Bindungsdiagonalen durch die zusätzlichen Querfäden 3 vollständig ausgefüllt.Figures 3 and 4 show an embodiment in which the additional transverse threads 3 are woven in pairs in opposite directions. The weave of the base fabric is the same as in the embodiment of FIGS. 1 and 4, and therefore only the integration of the additional transverse threads 3 is shown in FIG. 3. The one additional transverse thread 3a of a pair has a paper-supporting float on the paper side 4 over a length that spans a weave repeat of seven longitudinal threads 1, then runs over the same length inside the fabric, while the other, woven in at the same place Transverse thread 3b of this pair initially runs inside the fabric and then only runs a distance spanning the repeat of seven longitudinal threads 1 on the paper side 4. As shown in FIG. 4, all the binding diagonals are then completely filled in by the additional transverse threads 3.

Die zusätzlichen Querdrähte in Fig. 1 und Fig. 3 liegen in einer anderen vertikalen Ebene als die normalen Querfäden 2 und 5 des Gewebes. Die Figuren sind ein Schnitt in der Ebene der zusätzlichen Querfäden 3, so daß die sichtbaren Querschnitte der Längsfäden 1 ebenfalls für diese Ebene gelten. Der Verlauf der im Hintergrund sichtbaren normalen Querfäden 2 und 5 erscheint so, als würden diese Querfäden 2, 5 durch die Längsfäden 1 hindurchgehen. Tatsächlich haben die Längsfäden 1 jedoch an der Kreuzungsstelle mit den normalen Querfäden 2 und 5 eine andere Position als der gezeigte Querschnitt der Längsfäden 1.The additional transverse wires in FIGS. 1 and 3 lie in a different vertical plane than the normal transverse threads 2 and 5 of the fabric. The figures are a section in the plane of the additional transverse threads 3, so that the visible cross sections of the longitudinal threads 1 also apply to this plane. The course of the normal transverse threads 2 and 5 visible in the background appears as if these transverse threads 2, 5 would pass through the longitudinal threads 1. In fact, however, the longitudinal threads 1 have a different position at the intersection with the normal transverse threads 2 and 5 than the cross section of the longitudinal threads 1 shown.

Die zusätzlichen Querfäden 3 sind in dem Sinne fest eingebunden, daß zumindest ein Teil der Längsfäden 1, die über einem zusätzlichen Querfaden 3 liegen, dann unter einem oder beiden der danebenliegenden normalen Querfäden 2 verläuft.The additional transverse threads 3 are firmly integrated in the sense that at least some of the longitudinal threads 1, which lie over an additional transverse thread 3, then run under one or both of the adjacent normal transverse threads 2.

Die zusätzlichen Querfäden 3 sind vorzugsweise dünner als die normalen Querfäden 2 der oberen Lage. Da sie durch die Längsfäden 1 stark eingebunden sind und in jedem zweiten Bindungsrapport des Grundgewebes tief im Inneren des Gewebes verlaufen, sind die zusätzlichen Querfäden 3 vorzugsweise aus weichem Polyester- oder Polyamidmaterial. Dies hat den Vorteil einer höheren Beständigkeit beim Reinigen der Papiermaschinenbespannung mit Hochdruckwasserstrahlen. Es können auch andere Werkstoffe als Polyester oder Polyamid für die zusätzlichen Querfäden verwendet werden, z.B. Polypropylen oder Polyvinylidenfluorid (Kynar). Sollen besondere Markierungseffekte erreicht werden, können entlang der Bindungsdiagonale D1 Flottungen von zusätzlichen Querfäden verschiedenen Durchmessers und verschiedener Werkstoffe angeordnet werden, um die Monotonie des Markierungsabdruckes zu brechen.The additional transverse threads 3 are preferably thinner than the normal transverse threads 2 of the upper layer. Since they are strongly integrated by the longitudinal threads 1 and run deep in the interior of the fabric in every second weave repeat of the base fabric, the additional transverse threads 3 are preferably made of soft polyester or polyamide material. This has the advantage of greater resistance when cleaning the paper machine clothing with high pressure water jets. Materials other than polyester or polyamide can also be used for the additional transverse threads, e.g. Polypropylene or polyvinylidene fluoride (Kynar). If special marking effects are to be achieved, floats of additional transverse threads of different diameters and different materials can be arranged along the binding diagonal D1 in order to break the monotony of the marking impression.

Die nachfolgenden Beispiele betreffen offen gewebte Gewebe, so daß die Längsfäden gleichbedeutend mit der Kette und die Querfäden gleichbedeutend mit dem Schuß sind:The following examples concern open woven fabrics, so that the longitudinal threads are synonymous with the warp and the transverse threads are synonymous with the weft:

Beispiel 1example 1

Es wird ein 14-schäftiges Gewebe (siebenschäftiges Grundgewebe) mit einem Kettverlauf hergestellt, bei dem eine Kette über zwei Schußpaare, zwischen einem Schußpaar, unter einem Schußpaar und zwischen drei Schußpaaren verläuft und die Kettflottungen auf der Papierseite eine siebenschäftige Atlasverteilung aufweisen, wie in den Figuren 5 und 6 dargestellt.A 14-strand weave (seven-strand base fabric) is produced with a warp course, in which a chain runs over two pairs of wefts, between one pair of wefts, under one pair of wefts and between three pairs of wefts, and the warp floats on the paper side have a seven-strand satin distribution, as in the Figures 5 and 6 shown.

Zwischen jedem Paar von normalen Schußdrähten 2, 5 wird ein zusätzlicher Schuß 3 mit der in den Figuren 1 und 2 dargestellten 14-schäftigen Bindung eingewoben.Between each pair of normal weft wires 2, 5, an additional weft 3 with the 14-strand binding shown in FIGS. 1 and 2 is woven.

Die Bindung des Grundgewebes ist siebenschäftig, und die zusätzlichen Schußdrähte 3 werden nicht in jedem siebenschäftigen Rapport durch die Kette 1 eingebunden, sondern verlaufen entsprechend den Figuren 1 und 2 innerhalb eines siebenschäftigen Rapports auf der Papierseite 4 und im folgen den siebenschäftigen Rapport im Inneren des Gewebes.The weave of the base fabric has seven strands, and the additional weft wires 3 are not bound in every seven-strand repeat by the chain 1, but run according to FIGS. 1 and 2 within a seven-strand repeat on the paper side 4 and then the seven-strand repeat in the interior of the fabric .

Die unteren Schußdrähte 5 bestehen abwechselnd aus Polyester und Polyamid. Auf der Papierseite 4 liegen die Kettdrähte 1, die normalen Schußdrähte 2 und die zusätzlichen Schußdrähte alle in einer Ebene. Auf der Laufseite liegt der normale Schuß 5 gegenüber der Kette 8/100 mm tiefer, d.h., die Papiermaschinenbespannung ist ein Schußläufer. Weitere Angaben zu den verwendeten Fäden ergeben sich aus der Tabelle.The lower weft wires 5 consist alternately of polyester and polyamide. On the paper side 4, the warp wires 1, the normal weft wires 2 and the additional weft wires are all in one plane. On the barrel side, the normal weft 5 is 8/100 mm lower than the chain, i.e. the paper machine clothing is a weft runner. Further information on the threads used can be found in the table.

Das Gewebe hat eine feinstrukturierte Oberfläche (Papierseite 4). Es wird vorwiegend zur Herstellung markierungsempfindlicher Schreib- und Druckpapiere eingesetzt. Es wäre zu erwarten, daß infolge der Ungleichmäßigkeit der Struktur in Richtung der Rechts-Links-Diagonale D2 dieses Gewebe stärker markiert. Dies war jedoch überraschenderweise nicht der Fall, und zwar vermutlich deshalb, weil die Anhäufung der Schußflottungen entlang der Links-Rechts-Diagonale D1 durch fehlende Schußflottungen unterbrochen wird. Dies steht im Gegensatz zu der Erfahrung, daß normalerweise die Diagonale am stärksten markiert.The fabric has a finely structured surface (paper page 4). It is mainly used for the production of marking-sensitive writing and printing papers. It would be expected that due to the irregularity of the structure in the direction of the right-left diagonal D2, this tissue would be marked more. Surprisingly, however, this was not the case, presumably because the accumulation of the shot floats along the left-right diagonal D1 is interrupted by missing shot floats. This is in contrast to the experience that normally the diagonal is most marked.

Beispiel 2Example 2

Das Grundgewebe ist das gleiche wie in Beispiel 1. Die zusätzlichen Schußdrähte 3 sind jedoch paarweise eingewoben, wie es in Fig. 3 und 4 dargestellt ist. Die beiden zusätzlichen Schußdrähte 3a und 3b jedes Paares bestehen aus unterschiedlichem Material, wie in der nachfolgenden Tabelle angegeben. Die zusätzlichen Schußdrähte 3a und 3b sind so angeordnet, daß entlang der Bindungsdiagonale D1 abwechselnd Flottungen aus Polyester und Polyamid auf der Papierseite 4 liegen.

Figure imgb0001
The basic fabric is the same as in example 1. However, the additional weft wires 3 are woven in pairs, as shown in FIGS. 3 and 4. The two additional weft wires 3a and 3b of each pair are made of different materials, as in the following Specified table. The additional weft wires 3a and 3b are arranged in such a way that floats made of polyester and polyamide alternate on the paper side 4 along the binding diagonal D1.
Figure imgb0001

Claims (4)

  1. A clothing for the sheet forming section of a papermaking machine comprising a double-layer or multi-layer fabric of interwoven longitudinal and transverse threads and additional transverse threads floating on the paper supporting side,

    characterized

    in that the additional transverse threads (3) are interwoven in a plane disposed below the plane formed by the transverse threads (2) of the paper supporting side.
  2. Clothing according to claim 1, characterized in that the additional transverse threads (3) are interwoven with the longitudinal threads (1) at such a low level that the entire cross section of the additional transverse threads (3), at the site of interweaving, is disposed deeper than the deepest position of the ordinary weft threads (2) participating in the formation of the paper supporting side.
  3. Clothing according to claim 1 or 2, characterized in that the additional transverse threads (3) have a smaller diameter than the ordinary transverse threads (2).
  4. Clothing according to one of claims 1 to 3, characterized in that the additional transverse threads (3) consist of a material having the same or a lower elastic modulus than the ordinary transverse threads (2).
EP87114756A 1986-10-10 1987-10-09 Fabric for the wet end of a paper-making machine, with additional cross-machine floating strands having a larger harness Expired - Lifetime EP0263527B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87114756T ATE62947T1 (en) 1986-10-10 1987-10-09 CLOTHING FOR THE SHEET FORMING PART OF A PAPER MACHINE WITH ADDITIONAL, FLOATING CROSS THREADS OF LARGER REPEAT LENGTH.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3634649 1986-10-10
DE19863634649 DE3634649A1 (en) 1986-10-10 1986-10-10 COVERING FOR THE SHEET FORMING PART OF A PAPER MACHINE WITH ADDITIONAL, FLOATING CROSSFEDS LARGER RAPPORT LENGTH

Publications (2)

Publication Number Publication Date
EP0263527A1 EP0263527A1 (en) 1988-04-13
EP0263527B1 true EP0263527B1 (en) 1991-04-24

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EP87114756A Expired - Lifetime EP0263527B1 (en) 1986-10-10 1987-10-09 Fabric for the wet end of a paper-making machine, with additional cross-machine floating strands having a larger harness

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US (1) US4815503A (en)
EP (1) EP0263527B1 (en)
JP (1) JPS63105196A (en)
AR (1) AR246570A1 (en)
AT (1) ATE62947T1 (en)
BR (1) BR8704906A (en)
CA (1) CA1302844C (en)
DE (2) DE3634649A1 (en)
ES (1) ES2021669B3 (en)
FI (1) FI88629C (en)

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JP4739903B2 (en) * 2005-10-17 2011-08-03 日本フイルコン株式会社 Industrial two-layer fabric
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US7580229B2 (en) 2006-04-27 2009-08-25 Hitachi Global Storage Technologies Netherlands B.V. Current-perpendicular-to-the-plane (CPP) magnetoresistive sensor with antiparallel-free layer structure and low current-induced noise
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Also Published As

Publication number Publication date
FI88629B (en) 1993-02-26
ES2021669B3 (en) 1991-11-16
DE3769574D1 (en) 1991-05-29
FI874363A0 (en) 1987-10-05
CA1302844C (en) 1992-06-09
AR246570A1 (en) 1994-08-31
ATE62947T1 (en) 1991-05-15
US4815503A (en) 1989-03-28
JPS63105196A (en) 1988-05-10
FI88629C (en) 1993-06-10
BR8704906A (en) 1988-05-24
FI874363A (en) 1988-04-11
EP0263527A1 (en) 1988-04-13
DE3634649A1 (en) 1988-04-14

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