EP0211426A2 - Gewobene, mehrlagige Papiermaschinenbespannung erhöhter Stabilität und Durchlässigkeit - Google Patents
Gewobene, mehrlagige Papiermaschinenbespannung erhöhter Stabilität und Durchlässigkeit Download PDFInfo
- Publication number
- EP0211426A2 EP0211426A2 EP86110746A EP86110746A EP0211426A2 EP 0211426 A2 EP0211426 A2 EP 0211426A2 EP 86110746 A EP86110746 A EP 86110746A EP 86110746 A EP86110746 A EP 86110746A EP 0211426 A2 EP0211426 A2 EP 0211426A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- threads
- longitudinal threads
- paper machine
- transverse
- longitudinal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000004744 fabric Substances 0.000 title abstract description 7
- 230000035699 permeability Effects 0.000 title description 4
- 229920003002 synthetic resin Polymers 0.000 claims description 9
- 239000000057 synthetic resin Substances 0.000 claims description 9
- 239000010410 layer Substances 0.000 description 27
- 238000001035 drying Methods 0.000 description 11
- 230000000087 stabilizing effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000271 Kevlar® Polymers 0.000 description 1
- 229920000784 Nomex Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 239000004763 nomex Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Images
Classifications
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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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/006—Making patterned paper
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- 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
- Y10S162/90—Papermaking press felts
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- 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
- Y10S162/902—Woven fabric for papermaking drier section
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- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
- Y10T428/24322—Composite web or sheet
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24521—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness with component conforming to contour of nonplanar surface
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/2481—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including layer of mechanically interengaged strands, strand-portions or strand-like strips
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
- Y10T442/102—Woven scrim
- Y10T442/164—Including a preformed film, foil, or sheet
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2139—Coating or impregnation specified as porous or permeable to a specific substance [e.g., water vapor, air, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3065—Including strand which is of specific structural definition
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3065—Including strand which is of specific structural definition
- Y10T442/3089—Cross-sectional configuration of strand material is specified
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3065—Including strand which is of specific structural definition
- Y10T442/3089—Cross-sectional configuration of strand material is specified
- Y10T442/3114—Cross-sectional configuration of the strand material is other than circular
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
- Y10T442/3195—Three-dimensional weave [e.g., x-y-z planes, multi-planar warps and/or wefts, etc.]
- Y10T442/3203—Multi-planar warp layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
- Y10T442/322—Warp differs from weft
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3854—Woven fabric with a preformed polymeric film or sheet
Definitions
- the invention relates to a multi-layer paper machine clothing that carries paper stock during the production of paper on a paper machine.
- the paper machine clothing consists of interwoven longitudinal threads and transverse threads.
- Such paper machine clothing is generally known in the form of single-layer, double-layer or multi-layer fabrics. Difficulties arise with paper machine clothing if an open area of over 30% is to be achieved. Given the large distance between the longitudinal threads required for this, the stability in the longitudinal direction suffers. Even with multi-layer fabrics, such a large, projected open area cannot be achieved without sacrificing longitudinal stability.
- the invention specified in claim 1 solves the problem of creating a paper machine clothing that has a high longitudinal stability with a large, projected open area of over 30%.
- the paper machine clothing according to the invention can either be used in such a way that it carries the paper web directly, i.e. the paper web lies directly on it, or that it serves as a support for a synthetic resin layer which then only comes into contact with the paper web.
- the paper machine clothing according to the invention can be connected to the synthetic resin layer in such a way that the paper machine clothing is completely or partially embedded in the synthetic resin layer.
- the synthetic resin layer has a pattern of perforations which emboss a pattern on the paper web.
- the transverse threads are preferably woven in a four-shaft pattern, running within a weave repeat over the first pair of longitudinal threads, between the two longitudinal threads of the second pair, under the third pair of longitudinal threads and again between the longitudinal threads of the fourth pair.
- Successive transverse threads are preferably offset in the transverse direction by one longitudinal thread, so that the transverse thread offsets visible on one side form a diagonal.
- the bends of the cross threads can also form a cross-body pattern.
- the longitudinal threads and the transverse threads are preferably plastic monofilaments, in particular polyester monofilaments, and are woven together in an open (flat) weave.
- the longitudinal threads are the warp and the transverse threads are the weft.
- multifilaments can also be used for the longitudinal threads and / or transverse threads, and endless weave can be used, in which case the longitudinal threads are the weft and the transverse threads are the warp.
- Fig. 1 shows a dryer section of a paper machine, with a paper web W from left to right right runs.
- Several dryer sections can be connected in series to dry the paper web W step by step.
- the dryer section has an upper row of drying cylinders 10, 12 and 14 and a lower row of drying cylinders 16 and 18.
- the paper web W is brought out of the press section and runs around the individual drying cylinders. Water and other liquids in the paper web W evaporate.
- the paper web W is pressed against the upper drying cylinders 10, 12, 14 and the lower drying cylinders 16, 18 by an upper permeable drying wire 22 and a lower permeable drying wire 24, which run over guide rollers 26.
- the dryer fabrics 22, 24 are of identical construction and are application examples of the multi-ply paper machine clothing according to the invention, which is referred to below as "fabric A".
- the screen A presses and holds the paper web W against the drying cylinders, so that heat transfer takes place and water and other liquids evaporate from the paper web W.
- the drying takes place from the heated drying cylinders through the paper web W and further through the screen A to the outside.
- the sieve A must therefore have sufficient permeability.
- the multi-layer paper machine clothing according to the invention is also particularly suitable for use in through-flow drying systems for tissue and hygiene paper types.
- the screen A is used as a carrier screen for an embossed layer in which it is embedded and which shapes the paper web W.
- the use of a support screen and an embossed layer in one Paper machine with a through-flow dryer is described in detail in EP-A-0,135,231.
- the carrier screen itself has a permeability in the range of 1000 to 1200 cfm with increased stability in the longitudinal direction and an open area of 30% or more. The permeability is reduced by the embossed resin layer. However, it is still sufficient for use in blow-through dryers.
- the screen A has a paper side 29 and a rear side 49.
- FIG. 4 shows a top view of the paper side 29, the running direction being indicated by the arrow 28 and the transverse direction by the arrow 30.
- the screen A has a first layer B of longitudinal threads 32, 34, 36 and 38 which extend in the running direction 28 and form the paper side 29.
- the screen A also has a second layer C of second longitudinal threads 42, 44, 46 and 48, which form the rear side 49, which comes into contact with the guide rollers 26.
- the longitudinal threads of the first layer B and the longitudinal threads of the second layer C are vertically aligned one above the other.
- the superimposed longitudinal threads 32 and 42; 34 and 44; 36 and 46 and 38 and 48 each form a pair 52, 54, 56 and 58.
- Stabilizing transverse threads 40 are interwoven with the longitudinal threads of these pairs 52, 54, 56 and 58 in such a way that the arrangement of the longitudinal threads one above the other and in vertical alignment is maintained and the longitudinal threads do not shift laterally.
- the stabilizing effect of the cross threads 40 is achieved by the special type of integration.
- the weave pattern is four shafts, and as shown in FIG. 5, a transverse thread 40a runs over the first pair 52 of longitudinal threads, between the second pair 54, under the third pair 56 and between the pair 58 of longitudinal threads. 6, 7 and 8, the course of the transverse threads 40b, 40c and 40d is shifted to the right by a pair of longitudinal threads, so that the binding points 59 form a diagonal on the paper side 29, as can be seen in FIG. 4.
- the transverse threads 40c and 40d can, however, also be interchanged, a cross-twill pattern then being obtained on the paper side.
- the stabilizing effect of the transverse threads is then somewhat smaller, since each pair of longitudinal threads then runs together within a weave repeat once under one transverse thread and over the subsequent transverse thread.
- the sieve A has mesh openings 60.
- the size of the mesh openings 60 can be selected without losing the stabilizing effect of the transverse threads 40 so that the sieve has a projected open area of 30% or more of the entire sieve surface. Since the load-bearing longitudinal threads 32, 34, 36, 38 and 42, 44, 46, 48 are arranged vertically in pairs, the effective density of the load-bearing longitudinal threads is doubled, without this resulting in a reduction in the open area of the sieve.
- the sieve A is used as a carrier sieve for a synthetic resin layer 62 with openings or openings 66.
- the synthetic resin layer 62 has an outer surface 64 which carries the paper web W and embosses it in a pattern.
- the large open area in conjunction with high longitudinal stability is particularly advantageous when used as a carrier screen for a synthetic resin layer 62.
- the transverse threads 40 expediently have a larger diameter than the longitudinal threads of the upper and lower layers B and C, respectively, so that the longitudinal threads are bent more. This is particularly advantageous if the screen A is woven open and then made endless by connecting the fabric ends by means of a woven seam. The strength of such a woven seam is higher if the warp wires, which form the longitudinal threads when the weaving is open, are cranked as much as possible.
- the longitudinal threads of the upper layer B and the lower layer C can also consist of different material or have different diameters or different shapes, in which case either the longitudinal threads of the upper layer B or those of the lower layer C can be of the same nature as the transverse threads 40 .
- Polyester monofilaments are usually used for paper machine clothing.
- the use of polyamide monofilaments or multifilaments and threads made of highly heat-resistant materials such as Kevlar (registered trademark) or Nomex (registered trademark) is also possible.
- the cross-section of the longitudinal threads can be round, oval or rectangular.
- the round cross-sectional shape is particularly suitable for the transverse threads, although monofilaments with an oval or rectangular cross-section can also be used here.
- the diameter of the longitudinal threads and transverse threads is generally 0.10 to 0.20 mm. Depending on the application, however, smaller or larger diameters can also be used.
Abstract
Description
- Die Erfindung betrifft eine mehrlagige Papiermaschinenbespannung, die Papierstoff während der Herstellung von Papier auf einer Papiermaschine trägt. Die Papiermaschinenbespannung besteht aus miteinander verwobenen Längsfäden und Querfäden.
- Derartige Papiermaschinenbespannungen sind allgemein in Form von einlagigen, doppellagigen oder mehrlagigen Geweben bekannt. Bei Papiermaschinenbespannungen ergeben sich Schwierigkeiten, wenn eine offene Fläche von über 30 % erzielt werden soll. Bei dem hierfür erforderlichen großen Abstand der Längsfäden leidet die Stabilität in Längsrichtung. Auch mit mehrlagigen Geweben läßt sich eine derart große, projizierte offene Fläche ohne Einbuße an Längsstabilität nicht erreichen.
- Aus EP-A-123,431 ist eine Papiermaschinenbespannung mit drei Lagen von Längsfäden bekannt, die mit zwei Lagen von Querfäden verwoben sind. Es wird hierbei ein großes inneres Volumen angestrebt, da die Papiermaschinenbespannung in der Pressenpartie eingesetzt werden soll. Die Bespannung ist außerdem auf beiden Seiten mit einem Filz benadelt.
- Aus EP-A-135,231 ist eine Papiermaschinenbespannung für die Herstellung von Tissue-Papier unter Einsatz von Durchströmtrocknern bekannt.
- Die im Anspruch 1 angegebene Erfindung löst die Aufgabe, eine Papiermaschinenbespannung zu schaffen, die bei einer großen, projizierten offenen Fläche von über 30 % eine hohe Längsstabilität aufweist.
- Die erfindungsgemäße Papiermaschinenbespannung kann entweder so eingesetzt werden, daß sie unmittelbar die Papierbahn trägt, d.h., die Papierbahn unmittelbar auf ihr aufliegt, oder, daß sie als Träger für eine Kunstharzschicht dient, welche dann erst in Berührung mit der Papierbahn steht. In diesem Fall kann die erfindungsgemäße Papiermaschinenbespannung in der Weise mit der Kunstharzschicht verbunden sein, daß die Papiermaschinenbespannung ganz oder teilweise in die Kunstharzschicht eingebettet ist. Die Kunstharzschicht weist dabei ein Muster von Perforationen auf, die der Papierbahn eine Muster aufprägen.
- Damit im Betrieb die große offene Fläche der Papiermaschinenbespannung aufrechterhalten bleibt, muß dafür Sorge getragen werden, daß die beiden Längsfäden jedes Paares ihre vertikale Fluchtung beibehalten. Dies kann z.B. durch Verkleben der Längsfäden und Querfäden miteinander durch Ultraschall oder Beschichten erfolgen. Vorzugsweise werden die Querfäden in einem vierschäftigen Muster eingewoben, wobei sie innerhalb eines Bindungsrapportes über dem ersten Paar von Längsfäden, zwischen den beiden Längsfäden des zweiten Paares, unter dem dritten Paar von Längsfäden und wieder zwischen den Längsfäden des vierten Paares verlaufen. Aufeinanderfolgende Querfäden sind vorzugsweise jeweils um einen Längsfäden in Querrichtung versetzt sind, so daß die auf einer Seite sichtbaren Querfadenabkröpfungen eine Diagonale bilden. Die Abkröpfungen der Querfäden können jedoch auch ein Kreuzköpermuster bilden.
- Die Längsfäden und die Querfäden sind vorzugsweise Kunststoffmonofile, insbesondere Polyester-Monofile und werden in offener Webweise (flach) miteinander verwoben. Die Längsfäden sind dabei die Kette und die Querfäden der Schuß. Es können jedoch auch Multifilamente für die Längsfäden und/oder Querfäden eingesetzt werden, und es kann endlose Webart angewendet werden, wobei dann die Längsfäden der Schuß und die Querfäden die Kette sind.
- Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung erläutert. Es zeigen:
- Fig. 1 in perspektivischer Darstellung einen Teil einer Trockenpartie einer konventionellen Papiermaschine;
- Fig. 2 die erfindungsgemäße Papiermaschinenbespannung im Schnitt in Längsrichtung;
- Fig. 3 einen Schnitt ähnlich dem von Fig. 2, wobei die Papiermaschinenbespannung jedoch mit einer perforierten Kunstharzschicht versehen ist;
- Fig. 3A eine Draufsicht auf die Papiermaschinenbespannung von Fig. 3 im Schnitt nach 3A-3A;
- Fig. 4 eine Draufsicht auf die erfindungsgemäße Papiermaschinenbespannung und
- Fig. 5 bis 8 Schnittdarstellung nach den Linien 6-6; 7-7 bzw. 8-8 von Fig. 4.
- Die erfindungsgemäße Papiermaschinenbespannung ist insbesondere für die Trockenpartie einer Papiermaschine geeignet. Fig. 1 zeigt eine Trockenpartie einer Papiermaschine, wobei eine Papierbahn W von links nach rechts läuft. Es können dabei mehrere Trockenpartien hintereinander geschaltet werden, um die Papierbahn W stufenweise zu trocknen. Es bestehen verschiedene Bauweisen einer Trockenpartie und die in Fig. 1 gezeigte Bauweise dient nur Erläuterungszwecken. Die Trockenpartie weist eine obere Reihe von Trockenzylindern 10, 12 und 14 und eine untere Reihe von Trockenzylindern 16 und 18 auf. Die Papierbahn W wird aus der Pressenpartie herangeführt und läuft um die einzelnen Trockenzylinder herum. Wasser und andere Flüssigkeiten in der Papierbahn W verdampfen dabei. Die Papierbahn W wird von einem oberen durchlässigen Trockensieb 22 und einem unteren durchlässigen Trockensieb 24, die über Führungswalzen 26 laufen, gegen die oberen Trockenzylinder 10, 12, 14 bzw. die unteren Trockenzylinder 16, 18 gedrückt. Die Trockensiebe 22, 24 sind von identischer Konstruktion und sind Anwendungsbeispiele der erfindungsgemäßen mehrlagigen Papiermaschinenbespannung, die nachfolgend als "Sieb A" bezeichnet wird.
- Durch den Kontakt mit der Papierbahn W preßt und hält das Sieb A die Papierbahn W gegen die Trockenzylinder, so daß eine Wärmeübertragung stattfindet und Wasser und andere Flüssigkeiten aus der Papierbahn W verdampfen. Die Trocknung erfolgt dabei von den beheizten Trockenzylindern durch die Papierbahn W und weitere durch das Sieb A nach außen. Das Sieb A muß daher eine ausreichende Durchlässigkeit haben.
- Die erfindungsgemäße mehrlagige Papiermaschinenbespannung eignet sich darüberhinaus insbesondere auch zur Verwendung in Durchströmtrockensystem für Tissue- und Hygienepapiersorten. Bei dieser Anwendung wird das Sieb A als Trägersieb für eine geprägte Schicht eingesetzt, in die es eingebettet ist und die die Papierbahn W prägt. Die Verwendung eines Trägersiebes und einer geprägten Schicht in einer Papiermaschine mit einem Durchströmtrockner ist in EP-A-0,135,231 im einzelnen beschrieben. Das Trägersieb selbst hat dabei eine Durchlässigkeit im Bereich von 1000 bis 1200 cfm bei erhöhter Stabilität in Längsrichtung und einer offenen Fläche von 30 % oder mehr. Durch die geprägte Harzschicht wird die Durchlässigkeit zwar verringert. Sie ist jedoch immer noch ausreichend für die Verwendung in Durchströmtrocknern.
- Das Sieb A weist eine Papierseite 29 und eine Rückseite 49 auf. Fig. 4 zeigt eine Draufsicht auf die Papierseite 29, wobei die Laufrichtung durch den Pfeil 28 und die Querrichtung durch den Pfeil 30 angegeben ist. Das Sieb A weist eine erste Lage B von Längsfäden 32, 34, 36 und 38 auf, die sich in Laufrichtung 28 erstrecken und die Papierseite 29 bilden. Das Sieb A weist ferner eine zweite Lage C von zweiten Längsfäden 42, 44, 46 und 48 auf, die die Rückseite 49 bilden, die mit den Führungswalzen 26 in Berührung kommt. Wie aus den Figuren 2 und 5 bis 8 ersichtlich, sind die Längsfäden der ersten Lage B und die Längsfäden der zweiten Lage C vertikal fluchtend übereinander angeordnet. Die äbereinanderliegenden Längsfäden 32 und 42; 34 und 44; 36 und 46 sowie 38 und 48 bilden dabei jeweils ein Paar 52, 54, 56 bzw. 58.
- Stabilisierende Querfäden 40 sind so mit den Längsfäden dieser Paare 52, 54, 56 und 58 verwoben, daß die Anordnung der Längsfäden übereinander und vertikal fluchtend aufrechterhalten bleibt und sich die Längsfäden nicht seitlich verschieben.
- Die stabilisierende Wirkung der Querfäden 40 wird durch die besondere Art der Einbindung erreicht. Das Bindungsmuster ist vierschäftig, und gemäß Fig. 5 verläuft ein Querfaden 40a über dem ersten Paar 52 von Längsfäden, zwischen dem zweiten Paar 54, unter dem dritten Paar 56 und zwischen dem Paar 58 von Längsfäden. In den Figuren 6, 7 und 8 ist der Verlauf der Querfäden 40b, 40c und 40d jeweils um ein Paar von Längsfäden nach rechts verschoben, so daß auf der Papierseite 29 die Bindungspunkte 59 eine Diagonale bilden, wie in Fig. 4 erkennbar. Die Querfäden 40c und 40d, deren Verlauf in den Figuren 7 und 8 gezeigt ist, kann jedoch auch vertauscht werden, wobei sich dann auf der Papierseite ein Kreuzköper-Muster ergibt. Allerdings ist dann die stabilisierende Wirkung der Querfäden etwas kleiner, da jedes Längsfadenpaar dann innerhalb eines Bindungsrapportes einmal zusammen unter einem Querfaden und über dem darauffolgenden Querfaden verläuft.
- Das Sieb A weist Maschenöffnungen 60 auf. Die Größe der Maschenöffnungen 60 kann ohne Verlust der stabilisierenden Wirkung der Querfäden 40 so gewählt werden, daß das Sieb eine projizierte offene, Fläche von 30 % oder mehr der gesamten Siebfläche aufweist. Da die lastaufnehmenden Längsfäden 32, 34, 36, 38 und 42, 44, 46, 48 paarweise vertikal fluchtend angeordnet sind, ist die effektive Dichte der lastaufnehmenden Längsfäden verdoppelt, ohne daß sich dadurch eine Verringerung der offenen Fläche des Siebes ergibt.
- Dies ist insbesondere vorteilhaft, wenn das Sieb A als Trägersieb für eine Kunstharzschicht 62 mit Durchbrechungen oder Öffnungen 66 verwendet wird. Die Kunstharzschicht 62 weist eine äußere Oberfläche 64 auf, die die Papierbahn W trägt und musterartig prägt. Die große offene Fläche in Verbindung mit hoher Längsstabilität macht sich bei der Verwendung als Trägersieb für eine Kunstharzschicht 62 besonders vorteilhaft bemerkbar.
- Verschiedene Materialkombinationen, Drahtdurchmesser und Drahtformen können für die Längsfäden und Querfäden des hier beschriebenen Siebes A verwendet werden. Zweckmäßig haben die Querfäden 40 einen größeren Durchmesser als die Längsfäden der oberen und unteren Lage B bzw.. C, damit die Längsfäden stärker abgekröpft werden. Dies ist insbesondere dann von Vorteil, wenn das Sieb A offen gewebt wird und dann durch Verbinden der Gewebeenden mittels einer Webnaht endlosgemacht wird. Die Festigkeit einer solchen Webnaht ist höher, wenn die Kettdrähte, die bei offener Webweise die Längsfäden bilden, möglichst stark gekröpft sind.
- Die Längsfäden der oberen Lage B und der unteren Lage C können jedoch auch aus unterschiedlichem Material bestehen oder unterschiedlichen Durchmesser oder abweichende Form besitzen, wobei dann entweder die Längsfäden der oberen Lage B oder die der unteren Lage C von gleicher Beschaffenheit wie die Querfäden 40 sein können.
- Für Papiermaschinenbespannungen werden üblicherweise Polyester-Monofile verwendet. Die Verwendung von Polyamid-Monofilen oder -Multifilen und Fäden aus hochwärmebeständigen Materialien, wie Kevlar (eingetragenes Warenzeichen) oder Nomex (eingetragenes Warenzeichen) ist ebenfalls möglich. Der Querschnitt der Längsfäden kann rund, oval oder rechteckig sein. Für die Querfäden kommt insbesondere die runde Querschnittsform in Frage, obwohl auch hier Monofile mit ovalem oder rechteckigem Querschnitt einsetzbar sind.
- Der Durchmesser der Längsfäden und Querfäden beträgt im allgemeinen 0,10 bis 0,20 mm. Je nach dem Anwendungsfall können jedoch auch kleinere oder größere Durchmesser verwendet werden.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US06763039 US5114777B2 (en) | 1985-08-05 | 1985-08-05 | Woven multilayer papermaking fabric having increased stability and permeability and method |
US763039 | 1985-08-05 |
Publications (2)
Publication Number | Publication Date |
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EP0211426A2 true EP0211426A2 (de) | 1987-02-25 |
EP0211426A3 EP0211426A3 (de) | 1987-05-27 |
Family
ID=25066720
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP86110746A Withdrawn EP0211426A3 (de) | 1985-08-05 | 1986-08-04 | Gewobene, mehrlagige Papiermaschinenbespannung erhöhter Stabilität und Durchlässigkeit |
Country Status (3)
Country | Link |
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US (3) | US5114777B2 (de) |
EP (1) | EP0211426A3 (de) |
CA (1) | CA1269025A (de) |
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EP0394134A1 (de) * | 1989-04-21 | 1990-10-24 | Papeteries De Gascogne | Verfahren zur Markierung einer flexiblen Struktur, nach dem Verfahren hergestellte flexible Struktur und ihre Anwendung in einem Verfahren zur Markierung einer cellulosehaltigen Bahn |
FR2646181A1 (fr) * | 1989-04-21 | 1990-10-26 | Gascogne Papeteries | Procede de marquage d'une structure souple, structure souple ainsi obtenue et son utilisation dans un procede de marquage d'une feuille cellulosique |
EP0612882A1 (de) * | 1990-06-06 | 1994-08-31 | Asten, Inc. | Papiermachergewebe mit flachen Längsfäden |
US5167261A (en) * | 1990-06-06 | 1992-12-01 | Asten Group, Inc. | Papermakers fabric with stacked machine direction yarns of a high warp fill |
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US5092373A (en) * | 1990-06-06 | 1992-03-03 | Asten Group, Inc. | Papermakers fabric with orthogonal machine direction yarn seaming loops |
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US5411062A (en) * | 1990-06-06 | 1995-05-02 | Asten Group, Inc. | Papermakers fabric with orthogonal machine direction yarn seaming loops |
US5975148A (en) * | 1990-06-06 | 1999-11-02 | Asten, Inc. | Papermakers fabric with stacked machine direction yarns forming outer floats and inner knuckles |
US5199467A (en) * | 1990-06-06 | 1993-04-06 | Asten Group, Inc. | Papermakers fabric with stacked machine direction yarns |
US5230371A (en) * | 1990-06-06 | 1993-07-27 | Asten Group, Inc. | Papermakers fabric having diverse flat machine direction yarn surfaces |
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US5238027A (en) * | 1990-06-06 | 1993-08-24 | Asten Group, Inc. | Papermakers fabric with orthogonal machine direction yarn seaming loops |
US5449026A (en) * | 1990-06-06 | 1995-09-12 | Asten, Inc. | Woven papermakers fabric having flat yarn floats |
EP0612881A1 (de) * | 1990-06-06 | 1994-08-31 | Asten, Inc. | Papiermachergewebe mit flachen Längsfäden |
WO1991019044A1 (en) * | 1990-06-06 | 1991-12-12 | Asten Group, Inc. | Papermakers fabric with flat machine direction yarns |
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US5566724A (en) * | 1994-06-02 | 1996-10-22 | The Procter & Gamble Company | Multiple layer, multiple opacity backside textured belt |
US5500277A (en) * | 1994-06-02 | 1996-03-19 | The Procter & Gamble Company | Multiple layer, multiple opacity backside textured belt |
US5496624A (en) * | 1994-06-02 | 1996-03-05 | The Procter & Gamble Company | Multiple layer papermaking belt providing improved fiber support for cellulosic fibrous structures, and cellulosic fibrous structures produced thereby |
US5840411A (en) * | 1994-06-02 | 1998-11-24 | The Procter & Gamble Company | Multiple layer papermaking belt providing improved fiber support for cellulosic fibrous structures, and cellulosic fibrous structures produced thereby |
WO1999051814A1 (en) * | 1998-04-07 | 1999-10-14 | The Procter & Gamble Company | Papermaking belt providing improved drying efficiency for cellulosic fibrous structures |
US6103067A (en) * | 1998-04-07 | 2000-08-15 | The Procter & Gamble Company | Papermaking belt providing improved drying efficiency for cellulosic fibrous structures |
US6368465B1 (en) | 1998-04-07 | 2002-04-09 | The Procter & Gamble Company | Papermaking belt providing improved drying efficiency for cellulosic fibrous structures |
CN104278393A (zh) * | 2014-11-05 | 2015-01-14 | 浙江大港印染有限公司 | 一种网格布 |
Also Published As
Publication number | Publication date |
---|---|
US5114777A (en) | 1992-05-19 |
US5114777B1 (en) | 1995-07-18 |
US5114777B2 (en) | 1997-11-18 |
CA1269025A (en) | 1990-05-15 |
US5254398B1 (en) | 1997-10-14 |
US5254398A (en) | 1993-10-19 |
EP0211426A3 (de) | 1987-05-27 |
US5857497A (en) | 1999-01-12 |
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