EP1637645A2 - Paper machine clothing - Google Patents

Paper machine clothing Download PDF

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Publication number
EP1637645A2
EP1637645A2 EP20050106908 EP05106908A EP1637645A2 EP 1637645 A2 EP1637645 A2 EP 1637645A2 EP 20050106908 EP20050106908 EP 20050106908 EP 05106908 A EP05106908 A EP 05106908A EP 1637645 A2 EP1637645 A2 EP 1637645A2
Authority
EP
European Patent Office
Prior art keywords
covering
fibrous web
less
fabric
elevations
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.)
Granted
Application number
EP20050106908
Other languages
German (de)
French (fr)
Other versions
EP1637645B1 (en
EP1637645A3 (en
Inventor
Martin Serr
Lena Johansson
Scott D. Quigley
Volker Schmidt-Rohr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Voith Fabrics Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH, Voith Fabrics Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1637645A2 publication Critical patent/EP1637645A2/en
Publication of EP1637645A3 publication Critical patent/EP1637645A3/en
Application granted granted Critical
Publication of EP1637645B1 publication Critical patent/EP1637645B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • 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
    • 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
    • Y10T428/24281—Struck out portion type
    • 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
    • Y10T428/24281—Struck out portion type
    • Y10T428/24289—Embedded or interlocked
    • 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
    • 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.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • 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
    • 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 fabric for conveying a fibrous web in a machine for producing the fibrous web, in particular for use in a gap former (gap former) of a machine for producing a fibrous web.
  • a gap former gap former
  • this object is achieved in a fabric of the type mentioned fact that the fabric (2, 3) on the Fulcrum facing support points 1400 / cm 2 or more, preferably 1500 / cm 2 or more, most preferably 1600 / cm 2 or more, and most preferably 1700 / cm 2 or more fiber support sites
  • the fiber support points are formed by crossover points of a fabric of threads running in the machine direction and in the transverse direction.
  • the threads have a flat or flattened, in particular elliptical cross-section, a circular or plane of the covering formed by them.
  • the print quality of the paper can be improved if the fabric of the invention, which can be formed as a fabric or as a membrane, is used within the wire section and / or in the press section.
  • the invention enables sufficiently fine structures within the fabric or fabric layers of the fabrics. In order to create a particular smooth surface of the membrane or the covering, this or this surface may be ground off, in particular on the side facing the paper web.
  • the fabrics for the screen coverings are chosen so that the diameter of the circular threads is 0.13 mm or less, in particular 0.11 mm or less, or that the flat threads have a width of 0.11 mm or less and that it has a thickness of 0.13 mm or less, in particular 0.11 mm or less, more particularly of 0.08 mm or less.
  • the fabric according to the invention may comprise a membrane or be formed by a membrane.
  • fiber support sites are formed by elevations of the membrane.
  • the fiber support sites are formed by surfaces of a membrane, wherein between the surfaces of sinks or holes in the membrane are present.
  • the fabric or the membrane on the side facing the fibrous web as elevations serving elevations or hills and the rest has a flat surface. Between the elevations, the water sucked out of the pulp suspension or the fibrous web or pressed out can drain off. Through holes or through openings in the fabric or membrane, the water contained in the pulp suspension or the fibrous web can run on the opposite side.
  • the elevations are made so that they have a height of at most 0.08 mm, in particular of at most 0.06 mm, in particular of at most 0.04 mm.
  • the elevations may have a diameter between 0.1 and 0.4 mm.
  • a further preferred embodiment of the invention provides that the elevations have a diameter between 0.1 and 0.4 mm.
  • a fabric which has a thickness of 0.7 mm or less, in particular less than 0.63 mm, in particular less than 0.58 mm.
  • voids are present within the fabric or the membrane.
  • the number of voids within the fabric on the side facing the fibrous web is advantageously less than or equal to the number of voids on the side facing away from the fibrous web.
  • the membrane can be provided that it is ground or calendered on its surface facing the fibrous web.
  • the invention can be used both in a covering which comprises a fabric or is formed by a fabric, as well as in a fabric comprising a membrane or formed by a fabric.
  • the invention also relates to a method for producing a membrane, wherein the surveys according to the invention on the surface of the fabric or the membrane by means of a mold, in particular by means of an injection molding process, by a drilling process, by ablation, in particular laser ablation, by erosion , in particular by spark erosion, are generated.
  • the invention also relates to a method for producing a fibrous web, in particular a paper web, which is suitable for gravure printing.
  • a Gapformer (Siebformer) is used, in which either the top wire or the support wire or both wires are made of a fabric according to the invention.
  • the fibrous web is produced at a speed of 1600 m / min or more, more preferably 1700 m / min or more, more preferably 1800 m / min or more.
  • a twin-wire former 1 (FIG. 1) comprises a support wire 2 and a top wire 3, between which a fibrous web is produced in a twin-wire section 4 from a pulp suspension fed into a headbox 5 into a fibrous web.
  • At the top wire 3 wraps a forming roller 6 with a suction zone 7, while the support wire 2 is guided over an opposite guide roller 8.
  • a suction device 9 with two suction zones 10, 11 is arranged in the region of the twin-wire section 4.
  • the suction device 9 are strips 12, 13, 14 opposite.
  • a suction device 15 with suction zones 16, 17 and 18 attached On the side of the upper wire 3, a suction device 15 with suction zones 16, 17 and 18 attached.
  • the support wire 2 is guided at the end of the twin-wire section 4 via a wire suction roller 19 with two suction zones 20, 21. Subsequently, the strainer 2 moves past two flat suction cups 22, 23. The upper wire 3 is continued via a guide roller 25.
  • the support wire 2 and the top wire 3 are constructed, for example, as shown in Fig. 2.
  • elevations 27 are present, which have a height of, for example, 0.07 mm.
  • holes 28 are provided within the surface, passes through the water discharged from the fibrous web and is discharged.
  • the elevations may be provided that, as indicated in FIGS. 2 and 3, the elevations have depressions 31 in the center region.
  • the depressions 31 could also be the support sieve 2 or the upper sieve 3 through cross-sectional bores.
  • the elevations 27 have a plateau or dome-shaped design (cf., Fig. 3).
  • the sieve 2 or 3 is either made of a single material, or it is composed of a provided with a coating 29 pad 30.
  • the pad 30 is made of a plastic and may be reinforced with threads in CD and / or MD direction, which may be interwoven or not interwoven.
  • Sieve 2 or 3 has a permeability between 40 cfm and 1500 cfm.
  • the coating 29 can be applied to the substrate by various methods, for example by a casting, in particular an injection molding. Subsequently, the spaces between the elevations 27, which should remain, can be removed by various methods. Alternatively, a stencil applied to a roller may also be used to produce a surface on the coating having the desired number of protuberances 27, or the membrane may be fabricated as a whole by drawing between rollers.

Abstract

The covering (2, 3) includes supporting locations on the side facing the fibrous web. Their density is in the range 1400/cm 2>to 1700/cm 2>or more. They are formed by thread crossing points in the weave, and run in the machine- and transverse directions. The thread configuration is circular or flattened in relation to the plane of the covering, especially elliptical in cross section. Diameter of the circular threads ranges from 0.13 mm down to 0.08 mm or less. The covering is a self-stitched binding (SSB). The covering is a membrane, the supports being formed by raised locations. These are points or hills (27) facing the fibrous web, elsewhere the surface is planar. Raised locations have a height of up to 0.08 mm and their diameter is 0.1-0.4 mm. The thickness is especially less than 0.58 mm. The number of empty spaces within the fabric on the side facing the fibrous web is less than or equal to the corresponding number on the opposite side. The side facing the web is ground down or calendered. In a variant, the raised portions are formed by a casting mold, injection molding, boring, or spark erosion. The fibrous web is produced a rate of up to 1800 m/min or more.

Description

Die Erfindung betrifft eine Bespannung zum Fördern einer Faserstoffbahn in einer Maschine zur Herstellung der Faserstoffbahn, insbesondere für den Einsatz in einem Spaltformer (Gapformer) einer Maschine zur Herstellung einer Faserstoffbahn.The invention relates to a fabric for conveying a fibrous web in a machine for producing the fibrous web, in particular for use in a gap former (gap former) of a machine for producing a fibrous web.

Aus den US-Patenten 5 826 627 und 5 152 326 sind Gewebe bekannt, die aus mehreren Gewebelagen mit Schuss- und Kettfäden bestehen, wobei die Lagen durch einzelne Fäden miteinander verbunden sind. Dabei bestehen unterschiedliche Möglichkeiten zur Verbindung der Gewebelagen untereinander. Derartige Gewebe werden als Bespannungen in Papiermaschinen eingesetzt.From US Pat. Nos. 5,826,627 and 5,152,326, fabrics are known which consist of several fabric plies with weft and warp threads, the plies being connected to each other by individual threads. There are different ways to connect the fabric layers with each other. Such fabrics are used as coverings in paper machines.

Bei mittels der bekannten Bespannungen erzeugten Papierbahnen besteht das Problem, dass die Druckqualität nicht immer ausreichend ist, was sich beispielsweise durch das Fehlen von Druckpunkten (missing dots) oder durch eine zu hohe Rauhigkeit (PPS-roughness) bemerkbar macht. Es bestehen auch Probleme bei der Lauffähigkeit der Papierbahn, insbesondere im Siebtrennbereich, wo es zum Sprühen von Wasser von der auf der Oberseite laufenden Siebbespannung kommen kann.In the case of paper webs produced by means of the known clothing, there is the problem that the print quality is not always sufficient, which is manifested, for example, by the lack of print dots (missing dots) or by an excessively high roughness (PPS roughness). There are also problems in the runnability of the paper web, especially in the screen separation area, where it can come to spraying water from the current on the top Siebbespannung.

Es ist die Aufgabe der Erfindung, eine Bespannung zu schaffen, die für den Einsatz insbesondere in der Siebpartie und insbesondere für die Herstellung hochwertiger SC-Papiere geeignet ist.It is the object of the invention to provide a fabric which is suitable for use in particular in the wire section and in particular for the production of high quality SC papers.

Erfindungsgemäß wird diese Aufgabe bei einer Bespannung der eingangs genannten Art dadurch gelöst, dass die Bespannung (2, 3) auf der der Faserstoffbahn zugewandten Seite Unterstützungsstellen 1400/cm2 oder mehr, bevorzugt 1500/cm2 oder mehr, ganz besonders bevorzugt 1600/cm2 oder mehr und am meisten bevorzugt 1700/cm2 oder mehr Faserunterstützungsstellen aufweistAccording to the invention this object is achieved in a fabric of the type mentioned fact that the fabric (2, 3) on the Fulcrum facing support points 1400 / cm 2 or more, preferably 1500 / cm 2 or more, most preferably 1600 / cm 2 or more, and most preferably 1700 / cm 2 or more fiber support sites

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen, der Beschreibung und den Zeichnungen enthalten.Advantageous developments of the invention are contained in the subclaims, the description and the drawings.

Von Vorteil ist es, wenn im Falle des Einsatzes eines Gewebes für die Bespannung die Faserunterstützungsstellen durch Fadenkreuzungspunkte eines Gewebes von Fäden, die in Maschinenrichtung und in Querrichtung verlaufen, gebildet werden.It is advantageous if, in the case of the use of a fabric for the covering, the fiber support points are formed by crossover points of a fabric of threads running in the machine direction and in the transverse direction.

In einer weiteren vorteilhaften Ausgestaltung ist vorgesehen, dass die Fäden einen kreisförmigen oder gegenüber der von ihnen gebildeten Ebene der Bespannung einen flachen oder abgeflachten, insbesondere elliptischen Querschnitt haben.In a further advantageous embodiment, it is provided that the threads have a flat or flattened, in particular elliptical cross-section, a circular or plane of the covering formed by them.

Durch die Erfindung lässt sich die Druckqualität des Papiers verbessern, wenn die erfindungsgemäße Bespannung, die als Gewebe oder als Membrane ausgebildet sein kann, innerhalb der Siebpartie und/oder in der Pressenpartie eingesetzt wird. Durch die Erfindung werden genügend feine Strukturen innerhalb des Gewebes oder der Gewebelagen der Bespannungen ermöglicht. Um eine besondere glatte Oberfläche der Membran oder der Bespannung zu schaffen, kann diese bzw. dieses oberflächlich, insbesondere auf der der Papierbahn zugewandten Seite, abgeschliffen sein.By the invention, the print quality of the paper can be improved if the fabric of the invention, which can be formed as a fabric or as a membrane, is used within the wire section and / or in the press section. The invention enables sufficiently fine structures within the fabric or fabric layers of the fabrics. In order to create a particular smooth surface of the membrane or the covering, this or this surface may be ground off, in particular on the side facing the paper web.

Mit Vorteil sind die Gewebe für die Siebbespannungen so gewählt, dass der Durchmesser der kreisrunden Fäden 0,13 mm oder weniger, insbesondere 0,11 mm oder weniger, beträgt oder dass die flachen Fäden eine Breite von 0,11 mm oder weniger haben und dass sie eine Stärke von 0,13 mm oder weniger, insbesondere von 0,11 mm oder weniger, ganz insbesondere von 0,08 mm oder weniger, aufweisen.Advantageously, the fabrics for the screen coverings are chosen so that the diameter of the circular threads is 0.13 mm or less, in particular 0.11 mm or less, or that the flat threads have a width of 0.11 mm or less and that it has a thickness of 0.13 mm or less, in particular 0.11 mm or less, more particularly of 0.08 mm or less.

Ebenso erweist es sich auch als vorteilhaft, wenn die Bespannung ein SSB-Gewebe (SSB = self supporting binder) ist.Likewise, it proves to be advantageous if the fabric is a SSB fabric (SSB = self supporting binder).

Alternativ zu einem Gewebe kann die erfindungsgemäße Bespannung eine Membrane umfassen oder durch eine Membrane gebildet werden. In diesem Fall ist es denkbar, die Faserunterstützungsstellen durch Erhebungen der Membran gebildet werden. Es ist aber auch vorstellbar, dass die Faserunterstützungsstellen durch Flächen einer Membran gebildet werden, wobei zwischen den Flächen Senken oder Bohrungen in der Membran vorhanden sind.As an alternative to a fabric, the fabric according to the invention may comprise a membrane or be formed by a membrane. In this case, it is conceivable that fiber support sites are formed by elevations of the membrane. However, it is also conceivable that the fiber support sites are formed by surfaces of a membrane, wherein between the surfaces of sinks or holes in the membrane are present.

In einer vorteilhaften Ausgestaltung ist vorgesehen, dass die Bespannung oder die Membran auf der der Faserstoffbahn zugewandten Seite als Tragpunkte dienende Erhebungen oder Hügel und im übrigen eine plane Fläche aufweist. Zwischen den Erhebungen kann das aus der Faserstoffsuspension bzw. der Faserstoffbahn herausgesaugte oder herausgepresste Wasser ablaufen. Durch Bohrungen oder durchgehende Öffnungen in der Bespannung bzw. der Membran kann das in der Faserstoffsuspension bzw. der Faserstoffbahn enthaltene Wasser auf die abgewandte Seite ablaufen.In an advantageous embodiment, it is provided that the fabric or the membrane on the side facing the fibrous web as elevations serving elevations or hills and the rest has a flat surface. Between the elevations, the water sucked out of the pulp suspension or the fibrous web or pressed out can drain off. Through holes or through openings in the fabric or membrane, the water contained in the pulp suspension or the fibrous web can run on the opposite side.

Mit Vorteil werden die Erhebungen so hergestellt, dass sie eine Höhe von höchstens 0,08 mm, insbesondere von höchstens 0,06 mm, ganz insbesondere von höchstens 0,04 mm, haben. Die Erhebungen können einen Durchmesser zwischen 0,1 und 0,4 mm haben.Advantageously, the elevations are made so that they have a height of at most 0.08 mm, in particular of at most 0.06 mm, in particular of at most 0.04 mm. The elevations may have a diameter between 0.1 and 0.4 mm.

Eine weitere bevorzugte Ausführungsform der Erfindung sieht vor, dass die Erhebungen einen Durchmesser zwischen 0,1 und 0,4 mm haben.A further preferred embodiment of the invention provides that the elevations have a diameter between 0.1 and 0.4 mm.

Mit Vorteil lässt sich auch eine Bespannung einsetzen, das eine Dicke von 0,7 mm oder weniger hat, insbesondere von weniger als 0,63 mm, ganz insbesondere von weniger als 0,58 mm, hat.It is also advantageous to use a fabric which has a thickness of 0.7 mm or less, in particular less than 0.63 mm, in particular less than 0.58 mm.

Um eine gute Entwässerung der Faserstoffbahn zu gewährleisten, sind Leerräume innerhalb der Bespannung bzw. der Membran vorhanden. Die Anzahl von Leerräumen innerhalb des Gewebes auf der der Faserstoffbahn zugewandten Seite ist in vorteilhafter Weise kleiner oder gleich der Anzahl der Leerräume auf der von der Faserstoffbahn abgewandten Seite.In order to ensure good drainage of the fibrous web, voids are present within the fabric or the membrane. The number of voids within the fabric on the side facing the fibrous web is advantageously less than or equal to the number of voids on the side facing away from the fibrous web.

Zur Erhöhung der Glätte der Bespannung oder der Membran lässt sich vorsehen, dass sie auf ihrer der Faserstoffbahn zugewandten Oberfläche abgeschliffen oder kalandriert ist.To increase the smoothness of the fabric or the membrane can be provided that it is ground or calendered on its surface facing the fibrous web.

Die Erfindung lässt sich sowohl bei einer Bespannung die ein Gewebe umfasst oder durch ein Gewebe gebildet wird, wie auch bei einer Bespannung die eine Membran umfasst oder durch ein Gewebe gebildet wird einsetzen.The invention can be used both in a covering which comprises a fabric or is formed by a fabric, as well as in a fabric comprising a membrane or formed by a fabric.

Die Erfindung bezieht sich ebenfalls auf ein Verfahren zum Herstellen einer Membran, bei dem bzw. der die Erhebungen erfindungsgemäß auf der Oberfläche der Bespannung oder der Membran mittels einer Gussform, insbesondere mittels eines Spritzgussverfahrens, durch ein Bohrverfahren, durch Ablation, insbesondere Laserablation, durch Erodieren, insbesondere durch Funkenerodieren, erzeugt werden.The invention also relates to a method for producing a membrane, wherein the surveys according to the invention on the surface of the fabric or the membrane by means of a mold, in particular by means of an injection molding process, by a drilling process, by ablation, in particular laser ablation, by erosion , in particular by spark erosion, are generated.

Ebenso betrifft die Erfindung auch ein Verfahren zum Erzeugen einer Faserstoffbahn, insbesondere einer Papierbahn, die für den Tiefdruck geeignet ist. Hierbei wird ein Gapformer (Siebformer) eingesetzt, bei dem entweder das Obersieb oder das Tragsieb oder beide Siebe aus einer Bespannung gemäß der Erfindung hergestellt sind. Die Faserstoffbahn wird mit einer Geschwindigkeit von 1600 m/min oder mehr, insbesondere von 1700 m/min oder mehr, ganz insbesondere von 1800 m/min oder mehr, produziert.Likewise, the invention also relates to a method for producing a fibrous web, in particular a paper web, which is suitable for gravure printing. Here, a Gapformer (Siebformer) is used, in which either the top wire or the support wire or both wires are made of a fabric according to the invention. The fibrous web is produced at a speed of 1600 m / min or more, more preferably 1700 m / min or more, more preferably 1800 m / min or more.

Nachstehend wird die Erfindung in Ausführungsbeispielen näher erläutert. Es zeigen:

Fig. 1
eine Siebpartie in einer schematischen Darstellung,
Fig. 2
eine perspektivische Draufsicht auf ein Sieb und
Fig. 3, 4
Schnittansichten zweier verschiedener Siebe.
The invention will be explained in more detail in exemplary embodiments. Show it:
Fig. 1
a wire section in a schematic representation,
Fig. 2
a top perspective view of a sieve and
Fig. 3, 4
Sectional views of two different sieves.

Ein Doppelsiebformer 1 (Fig. 1) umfasst ein Tragsieb 2 und ein Obersieb 3, zwischen denen in einer Doppelsiebstrecke 4 eine Faserstoffbahn aus einer in einem Stoffauflauf 5 zugeführten Faserstoffsuspension eine Faserstoffbahn erzeugt wird. An dem Obersieb 3 umschlingt eine Formierwalze 6 mit einer Saugzone 7, während das Tragsieb 2 über eine gegenüberliegende Umlenkwalze 8 geführt wird. Auf der Seite des Tragsiebs 2 ist im Bereich der Doppelsiebstrecke 4 eine Saugeinrichtung 9 mit zwei Saugzonen 10, 11 angeordnet. Der Saugeinrichtung 9 liegen Leisten 12, 13, 14 gegenüber. Auf der Seite des Obersiebs 3 eine Saugeinrichtung 15 mit Saugzonen 16, 17 und 18 angebracht.A twin-wire former 1 (FIG. 1) comprises a support wire 2 and a top wire 3, between which a fibrous web is produced in a twin-wire section 4 from a pulp suspension fed into a headbox 5 into a fibrous web. At the top wire 3 wraps a forming roller 6 with a suction zone 7, while the support wire 2 is guided over an opposite guide roller 8. On the side of the support 2, a suction device 9 with two suction zones 10, 11 is arranged in the region of the twin-wire section 4. The suction device 9 are strips 12, 13, 14 opposite. On the side of the upper wire 3, a suction device 15 with suction zones 16, 17 and 18 attached.

Das Tragsieb 2 wird am Ende der Doppelsiebstrecke 4 über eine Siebsaugwalze 19 mit zwei Saugzonen 20, 21 geführt. Anschließend bewegt sich das Tragsieb 2 an zwei Flachsaugern 22, 23 vorbei. Das Obersieb 3 wird über eine Umlenkwalze 25 weitergeführt.The support wire 2 is guided at the end of the twin-wire section 4 via a wire suction roller 19 with two suction zones 20, 21. Subsequently, the strainer 2 moves past two flat suction cups 22, 23. The upper wire 3 is continued via a guide roller 25.

Das Tragsieb 2 und das Obersieb 3 sind beispielsweise aufgebaut, wie in Fig. 2 dargestellt ist. Auf der Faserstoffbahn zugewandten Fläche 26 sind Erhebungen 27 vorhanden, die eine Höhe von beispielsweise 0,07 mm haben. Zwischen den Erhebungen 27 sind innerhalb der Fläche 26 Bohrungen 28 vorhanden, durch die von der Faserstoffbahn abgegebenes Wasser hindurchtritt und abgeführt wird. Optional kann vorgesehen sein, dass, wie in der Fig. 2 und Fig. 3 angedeutet ist, die Erhebungen im Mittenbereich Senken 31 hat. Die Senken 31 könnten alternativ auch das Tragsieb 2 oder das Obersieb 3 durch greifende Bohrungen sein.The support wire 2 and the top wire 3 are constructed, for example, as shown in Fig. 2. On the fibrous web-facing surface 26 elevations 27 are present, which have a height of, for example, 0.07 mm. Between the elevations 27 26 holes 28 are provided within the surface, passes through the water discharged from the fibrous web and is discharged. Optionally, it may be provided that, as indicated in FIGS. 2 and 3, the elevations have depressions 31 in the center region. Alternatively, the depressions 31 could also be the support sieve 2 or the upper sieve 3 through cross-sectional bores.

Die Erhebungen 27 haben eine plateau- oder kuppenförmige Ausbildung (vgl. Fig. 3). Das Sieb 2 oder 3 besteht entweder aus einem einzigen Material, oder es ist aus einer mit einer Beschichtung 29 versehenen Unterlage 30 aufgebaut. Die Unterlage 30 besteht aus einem Kunststoff und kann mit Fäden in CD und/ oder MD Richtung, die miteinander verwoben oder nicht verwoben sein können, verstärkt sein. Das Sieb 2 oder 3 hat eine Durchlässigkeit zwischen 40 cfm und 1500 cfm.The elevations 27 have a plateau or dome-shaped design (cf., Fig. 3). The sieve 2 or 3 is either made of a single material, or it is composed of a provided with a coating 29 pad 30. The pad 30 is made of a plastic and may be reinforced with threads in CD and / or MD direction, which may be interwoven or not interwoven. Sieve 2 or 3 has a permeability between 40 cfm and 1500 cfm.

Die Beschichtung 29 kann mittels verschiedener Verfahren auf die Unterlage aufgebracht werden, beispielsweise durch ein Gieß-, insbesondere ein Spritzgießverfahren. Anschließend lassen sich die Zwischenräume zwischen den Erhebungen 27, die verbleiben sollen, durch verschiedene Verfahren abtragen. Alternativ lässt sich auch durch eine auf eine Walze aufgebrachte Schablone eine Oberfläche auf der Beschichtung herstellen, die die gewünschte Anzahl von Erhebungen 27 aufweist, oder die Membran wird als ganze durch Ziehen zwischen Walzen hergestellt.The coating 29 can be applied to the substrate by various methods, for example by a casting, in particular an injection molding. Subsequently, the spaces between the elevations 27, which should remain, can be removed by various methods. Alternatively, a stencil applied to a roller may also be used to produce a surface on the coating having the desired number of protuberances 27, or the membrane may be fabricated as a whole by drawing between rollers.

Claims (14)

Bespannung (2, 3) zum Fördern einer Faserstoffbahn in einer Maschine zur Herstellung der Faserstoffbahn, insbesondere für den Einsatz in einem Spaltformer (Gapformer) einer Maschine zur Herstellung einer Faserstoffbahn,
dadurch gekennzeichnet,
dass die Bespannung (2, 3) auf der der Faserstoffbahn zugewandten Seite 1400/cm2 oder mehr, bevorzugt 1500/cm2 oder mehr, ganz besonders bevorzugt 1600/cm2 oder mehr und am meisten bevorzugt 1700/cm2 oder mehr Faserunterstützungsstellen aufweist.Covering (2, 3) for conveying a fibrous web in a machine for producing the fibrous web, in particular for use in a gap former of a machine for producing a fibrous web,
characterized,
that the covering (2, 3) on the side facing the fibrous web page 1400 / cm 2 or more, preferably at 1500 / cm 2 or more, quite particularly preferably 1600 / cm 2 or more and most preferably 1700 / cm 2 or more fiber support points , Bespannung (2, 3) nach Anspruch 1,
dadurch gekennzeichnet,
dass die Faserunterstützungsstellen durch Fadenkreuzungspunkte eines Gewebes von Fäden, die in Maschinenrichtung und in Querrichtung verlaufen, gebildet werdenCovering (2, 3) according to claim 1,
characterized,
in that the fiber support points are formed by crosshairs of a fabric of yarns extending in the machine direction and in the transverse direction Bespannung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass die Fäden einen kreisförmigen oder gegenüber der von ihnen gebildeten Ebene der Bespannung einen flachen oder abgeflachten, insbesondere elliptischen Querschnitt haben.Fabric according to claim 1 or 2,
characterized,
in that the threads have a flat or flattened, in particular elliptical cross-section, a circular or plane of the covering formed by them. Bespannung (2, 3) zum Fördern einer Faserstoffbahn in einer Maschine zur Herstellung einer Faserstoffbahn, umfassend ein Gewebe von Fäden, die in Maschinenrichtung und in Querrichtung verlaufen, insbesondere nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
dass der Durchmesser der kreisrunden Fäden 0,13 mm oder weniger, insbesondere 0,11 mm oder weniger, beträgt oder dass die flachen Fäden eine Breite von 0,11 mm oder weniger haben und dass sie eine Stärke von 0,13 mm oder weniger, insbesondere von 0,11 mm oder weniger, ganz insbesondere von 0,08 mm oder weniger aufweisen.Covering (2, 3) for conveying a fibrous web in a machine for producing a fibrous web, comprising a fabric of threads running in the machine direction and in the transverse direction, in particular after one of claims 1 to 3,
characterized,
that the diameter of the circular threads is 0.13 mm or less, in particular 0.11 mm or less, or that the flat threads have a width of 0.11 mm or less and that they have a thickness of 0.13 mm or less, in particular of 0.11 mm or less, more particularly of 0.08 mm or less. Bespannung (2, 3) zum Fördern einer Faserstoffbahn in einer Maschine zur Herstellung der Faserstoffbahn, umfassend ein Gewebe von Fasern, die in Maschinenrichtung und in Querrichtung verlaufen, insbesondere nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
dass die Bespannung (2, 3) ein SSB-Gewebe (SSB = self stitched binding) ist.A fabric (2, 3) for conveying a fibrous web in a machine for producing the fibrous web, comprising a fabric of fibers which extend in the machine direction and in the transverse direction, in particular according to one of claims 1 to 4,
characterized,
that the covering (2, 3) an SSB fabric (SSB = self stitched binding) is. Bespannung (2, 3) nach Anspruch 1,
dadurch gekennzeichnet,
dass die Bespannung eine Membran umfasst und dass die Faserunterstützungsstellen durch Erhebungen der Membran gebildet werden.Covering (2, 3) according to claim 1,
characterized,
that the covering comprises a membrane and that the fiber support sites are formed by elevations of the membrane. Bespannung (2, 3), insbesondere nach Anspruch 6,
dadurch gekennzeichnet,
dass sie auf der der Faserstoffbahn zugewandten Seite als Tragpunkte dienende Erhebungen (27) oder Hügel und im übrigen eine plane Fläche aufweist.Covering (2, 3), in particular according to claim 6,
characterized,
that it has on the side facing the fibrous web as supporting points elevations (27) or hills and otherwise has a flat surface. Bespannung (2, 3), insbesondere nach einem der Ansprüche 6 bis 7,
dadurch gekennzeichnet,
dass die Erhebungen (27) eine Höhe von höchstens 0,08 mm, insbesondere von höchstens 0,06 mm, ganz insbesondere von höchstens 0,04 mm, haben.Covering (2, 3), in particular according to one of claims 6 to 7,
characterized,
that the elevations (27) have a height of at most 0.08 mm, in particular of at most 0.06 mm, in particular of at most 0.04 mm. Bespannung (2, 3) nach einem der Ansprüche 6 bis 8,
dadurch gekennzeichnet,
dass die Erhebungen einen Durchmesser zwischen 0,1 und 0,4 mm haben.Covering (2, 3) according to one of claims 6 to 8,
characterized,
that the elevations have a diameter between 0.1 and 0.4 mm. Bespannung (2, 3) nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet,
dass die Bespannung (2, 3) eine Dicke von 0,7 mm oder weniger hat, insbesondere von weniger als 0,63 mm, ganz insbesondere von weniger als 0,58 mm.Covering (2, 3) according to one of claims 1 to 9,
characterized,
mm that the covering (2, 3) mm a thickness of 0.7 or less, in particular of less than 0.63 mm, quite particularly of less than 0.58. Bespannung (2, 3) nach einem der Ansprüche 1 bis 11,
dadurch gekennzeichnet,
die Anzahl von Leerräumen innerhalb des Gewebes auf der der Faserstoffbahn zugewandten Seite kleiner oder gleich der Anzahl der Leerräume auf der von der Faserstoffbahn abgewandten Seite ist.Covering (2, 3) according to one of claims 1 to 11,
characterized
the number of voids within the fabric on the side facing the fibrous web is less than or equal to the number of voids on the side facing away from the fibrous web. Bespannung (2, 3), insbesondere nach einem der Ansprüche 1 bis 11,
dadurch gekennzeichnet,
dass sie auf ihrer der Faserstoffbahn zugewandten Oberfläche abgeschliffen oder kalandriert ist.Covering (2, 3), in particular according to one of claims 1 to 11,
characterized,
that it is ground or calendered on its surface facing the fibrous web. Verfahren zum Herstellen einer Bespannung (2, 3) nach einem der Ansprüche 1 bis 12,
dadurch gekennzeichnet,
dass die Erhebungen auf der Oberfläche der Bespannung (2, 3) oder der Membran mittels einer Gussform, insbesondere mittels eines Spritzgussverfahrens, durch ein Bohrverfahren, durch Ablation, insbesondere Laserablation, durch Erodieren, insbesondere durch Funkenerodieren, erzeugt werden.Method for producing a covering (2, 3) according to one of Claims 1 to 12,
characterized,
in that the elevations are produced on the surface of the covering (2, 3) or the membrane by means of a casting mold, in particular by means of an injection molding process, by a drilling process, by ablation, in particular laser ablation, by erosion, in particular by spark erosion. Verfahren zum Erzeugen einer Faserstoffbahn, insbesondere einer Papierbahn, die für den Tiefdruck geeignet ist, mit einer Bespannung (2, 3) nach einem der Ansprüche 1 bis 12, die in einem Gapformer (Siebformer) eingesetzt wird,
dadurch gekennzeichnet,
dass die Faserstoffbahn mit einer Geschwindigkeit von 1600 m/min oder mehr, insbesondere von 1700 m/min oder mehr, ganz insbesondere von 1800 m/min oder mehr, produziert wird.Method for producing a fibrous web, in particular a paper web which is suitable for gravure printing, with a covering (2, 3) according to one of claims 1 to 12, which is used in a gap former (screen former),
characterized,
is that the fiber web at a speed of 1600 m / min or more, in particular 1700 m / min or more, very particularly from 1800 m / min or more, is produced.
EP20050106908 2004-09-15 2005-07-27 Paper machine clothing Not-in-force EP1637645B1 (en)

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DE502005003060D1 (en) 2008-04-17
US20060063451A1 (en) 2006-03-23
ATE388267T1 (en) 2008-03-15
EP1637645B1 (en) 2008-03-05
US7491297B2 (en) 2009-02-17
ES2302132T3 (en) 2008-07-01
EP1637645A3 (en) 2006-06-07

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