EP2072669B1 - Bande pour une machine destinée à la fabrication de matériaux en bande et procédé de fabrication d'une telle bande - Google Patents

Bande pour une machine destinée à la fabrication de matériaux en bande et procédé de fabrication d'une telle bande Download PDF

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Publication number
EP2072669B1
EP2072669B1 EP08161410.9A EP08161410A EP2072669B1 EP 2072669 B1 EP2072669 B1 EP 2072669B1 EP 08161410 A EP08161410 A EP 08161410A EP 2072669 B1 EP2072669 B1 EP 2072669B1
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EP
European Patent Office
Prior art keywords
fibre
web
polymer
contact surface
layer
Prior art date
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Application number
EP08161410.9A
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German (de)
English (en)
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EP2072669A1 (fr
Inventor
Robert Crook
Arved Westerkamp
Hubert Walkenhaus
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
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Voith Patent GmbH
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Publication of EP2072669B1 publication Critical patent/EP2072669B1/fr
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Classifications

    • 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
    • D21F7/083—Multi-layer felts
    • 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
    • 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
    • Y10T442/2861—Coated or impregnated synthetic organic fiber fabric

Definitions

  • the present invention relates to a belt for a machine for producing sheet material, in particular paper or cardboard, and to a method for producing such a belt.
  • a volume according to the generic term of the Claim 1 is made EP1757728A1 known.
  • belts which move the web material to be produced through, for example, press nips formed between two press rolls. Due to the physical load, the web material to be produced is compressed and liquid is pressed out of it. The liquid should be taken up in the band contacting the web material and discharged therefrom. It is basically the objective to design such a band so that it can absorb a high proportion of liquid so that after passing through a press nips, so when relaxing, this liquid does not get back to the surface of the web material and that the surface structure of the Bands, if not desired, does not appear in the surface of the web material to be produced.
  • a belt, in particular press felt, for a machine for producing web material, in particular paper or cardboard comprising a support structure and on a web material contact side of the support structure fiber material with polymer material contained therein, in particular with thermoplastic polyurethane material contained therein which together with fibers of the fibrous material forms a fluid-permeable composite structure by only partially filling and / or bridging the polymeric material between fibers of the fibrous material of the formed voids, with a majority of the polymer material being provided in a volume region near a web material contact surface of the fibrous material. At least 80% of the polymer material is provided in a depth range of 20% of the fiber material starting from the web material contact surface.
  • a permeable composite structure is formed in the region of the web material contact surface by fibers of the fiber material and the polymer material.
  • the fibers are at least partially embedded in the polymer material.
  • the porosity of the composite structure is in this case formed by the polymer material between fibers of the fiber material of the cavities formed only partially filled and / or bridged. This means that the polymer material itself is not porous, such as foamed.
  • the polymer material contained in the fiber material is provided in a region of the fiber material providing near-surface or also essentially a web material contact surface, a predominantly plate-like configuration is formed by this polymer material, which nevertheless allows liquid to pass through.
  • this polymer material in the structure of the fiber material embedded this structure of the fiber material will also be on the web material contact surface in the manner of a microstructure, which on the one hand is not so strong that it appears in the web material to be produced, on the other hand, however, due to the existing irregularity and in connection with the porosity allows much better release of such a band of the web material to be produced.
  • the tape of the invention may comprise a plurality of layers of fibrous material, the bulk of the polymeric material then being provided in the fibrous material layer providing the web material contact surface.
  • the layer of fiber material providing the web material contact surface be finer than an underlying layer of fiber material.
  • the layer of fiber material providing the web material contact surface is constructed with fibers of up to 17 dtex.
  • the term "finer" means that in such a situation, a smaller proportion of cavities is present, as in a coarser position. This can be achieved, for example, by using fibers with a comparatively low dtex value, but on the other hand can also be influenced by the density of such a layer.
  • the polymeric material forms a one-piece and permeable polymer layer.
  • a one-piece and permeable polymer layer is formed, which extends in the region of the web material contact surface in the fiber material and into the fibers of the Fiber material is at least partially embedded.
  • the polymer layer is firmly connected to the fibers.
  • a one-piece polymer layer is to be understood here as meaning a polymer layer which is formed from a single coherent piece.
  • the polymer layer has openings extending therethrough, the openings in the polymer layer being formed by the polymer material forming the polymer layer only partially filling and / or bridging voids formed between fibers of the fiber layer.
  • the fiber material if it is, for example, of polyamide, for example, be dissolved out by means of formic acid.
  • the one-piece and permeable polymer layer forms a permeable composite structure with fibers of the fiber material which provides a high and low-power water drainage capability in operation.
  • the measure b) comprises the provision of several layers of fiber material on the support structure and that the measure c) essentially provides the provision of the polymer material only in a layer providing a sheet material contact surface Fiber material comprises.
  • the fibrous material layer providing the web material contact surface may be finer than an underlying fibrous material layer.
  • the liquid which has passed through the web material contact surface and also contains the polymer material can very quickly move through the coarser structure of the underlying layer, so that the risk of rewetting can be significantly reduced.
  • the measure c) may comprise applying a preferably aqueous dispersion with particulate polymer material from a web material contact side and melting the particulate polymer material. In this case, before the melting, the liquid introduced in connection with the dispersion can be drawn off from the fiber material or support structure.
  • the support structure may be formed, for example, tissue-like or random.
  • the fiber material may be non-woven or felt-like.
  • Fig. 1 is a sectionally and in principle illustrated band generally designated 10.
  • This tape 10 for example, provided in an endless configuration, can be used in a dry section of a paper machine. It has a mechanical load, in particular in the tape longitudinal direction and in the transverse direction of the tape receiving support structure 12.
  • This support structure 12 may be formed for example as a fabric, as a scrim or as a spiral link structure.
  • On a machine contact side 14 of the support structure 12 may be provided a layer 16 of fiber material, so for example a felt layer or a nonwoven layer, which may be connected to the support structure 12, for example by needling.
  • a web material contact side 18, in the illustrated embodiment a total of four layers 20, 22, 24, 26 of fiber material are provided, which may also be non-woven or felt-like. These layers 20, 22, 24, 26 may be fixedly connected to the support structure 12 by needling.
  • a multiplicity of particles 30 are provided of polymer material. Also in the immediately underlying layer 22 of fiber material or in other layers 24, 26 of fiber material such particles 30 may still be present, but a large part, so for example at least half of the particles 30 in the top and the web material contact surface 28 providing position 20 are contained from fiber material.
  • the Fig. 1 shows the inventively constructed band 10 in an intermediate production phase, namely after firmly connecting the various layers 20, 22, 24, 26 and possibly 16 of fiber material to the support structure 12, preferably by needling and also after the introduction of the particles 30 of polymer material .
  • This introduction of the particles 30 can take place in that, after the bonding of the layers 20, 22, 24, 26 of fibrous material to the support structure 12, an aqueous dispersion, for example, in which the particles 30 are contained, is applied to the web material contact surface 28. With this aqueous dispersion, the particles 30 are also registered in the inner volume area, so that in the Fig. 1 recognizable distribution.
  • this layer 20 of fiber material is formed with such a fine structure that, in particular, also in coordination with the size or average size of the particles 30 these are primarily able to remain 20 of fibrous material.
  • this layer 20 of fiber material for example, made of fibers with a relatively low dtex number, for example below 20 dtex, and also comparatively high density, ie high fiber content per unit volume, so that the remaining in this layer 20 of fiber material pores so small are that a majority of the particles 30 are caught in it.
  • the fibers of layer 20 of fibrous material may be formed with a dtex value in the range of 6 to 17, while, for example, the immediately underlying layer 22 of fibrous material may be constructed with fibers having a dtex value in the range of 44.
  • the size distribution of these particles 30 be such that at least 50% of them have a size in the range of 20 to 200 microns.
  • some of the smaller particles can also get into the next layer 22 of fiber material and get caught in the pores there.
  • the density of the particles 30 decreases sharply in the direction of the web material contact surface 28, so that substantially only within the first 30% of the depth, measured from the web material contact surface 28, such particles are present to a relevant extent.
  • At least 80% of the particles 28 are present in the first 20% of the depth. If the layers 22, 24, 26 lying below the first layer 20 of fibrous material are formed with a significantly coarser structure, thus also larger pore volume, then it can be ensured, for example, that the particles 30 emerging beyond the layer 20 are also in these layers and in particular on the support structure 12 is not caught, so that they emerge from the belt 10 together with the withdrawn example by negative pressure, by a blower or by drying liquid.
  • the strip 10 is heated, for example, by passage through two heated rolls, above the melting temperature of the polymer material of the particles 30. Heating in a corresponding heating chamber is also possible.
  • the tape can be heated for example for two minutes to a temperature of about 200 ° C.
  • the melting point of thermoplastic polyurethane material, which can be used for example for the particles 30, is about 187 ° C, while the melting point of the fiber used for the polyamide 6 fibers is about 223 ° C. This means that, although the material of the particles 28 will melt, the fibers of the fiber material will retain their structure.
  • the melting polymer material is then distributed in the porous structure of the fiber material containing it in each case, so that in this particular position, as in Fig.
  • polymer material 32 which, together with fibers of the layer, is a permeable one Composite structure only partially fills and / or bridges voids formed between fibers of the layer by the polymeric material filling (see FIGS. 3 and 4 ).
  • the volume regions of the polymer material 33 resulting from the melting particles communicate with each other to form a structure having a plurality of pores 34 therebetween.
  • the polymer material is in particular also surround the fibers or connect them together in their intersection points, so that in the 3 and 4 recognizable permeable composite structure is obtained from the polymer material and the fiber material embedded in the polymer material.
  • Also recognizable web material contact surface of this plate-like composite of polymer material is a microstructuring by the fibers formed in the polymer material increases. This patterning is too small to be apparent in the web material to be made with such a tape, but facilitates release of the web from the web material, particularly because the composite material providing the web material contact surface has a very large number of open pores.
  • the polymer material disposed in the region of the web material contact surface forms a one-piece and permeable polymer layer.
  • the principles of the invention may be practiced with other embodiments.
  • the number of layers of fiber material could differ from the number shown.
  • thicker layer of fiber material can be ensured by appropriate coordination of the particle size on the one hand and the fineness of the situation on the other hand, that a majority of the particles will accumulate in the near-surface region, so that when melting and re-hardening also the plate-like configuration nevertheless high porosity will result.

Landscapes

  • Nonwoven Fabrics (AREA)
  • Paper (AREA)

Claims (12)

  1. Bande pour une machine de fabrication d'un matériau en feuille continue, en particulier du papier ou du carton, comprenant une structure support (12) et, contre une face de contact (18) avec le matériau en feuille continue de la structure support (12), un matériau fibreux (20, 22, 24, 26), avec un matériau polymère (32) qui y est contenu, en particulier avec un matériau de polyuréthanne thermoplastique (32) qui y est contenu, qui ensemble avec les fibres du matériau fibreux (20, 22, 24, 26) forme une structure composite perméable au fluide, le matériau polymère ne remplissant et/ou ne recouvrant que partiellement des espaces creux formés entre des fibres du matériau fibreux (20, 22, 24, 26), et une majorité du matériau polymère (32) étant prévue dans un espace volumique proche d'une surface de contact (28) avec le matériau en feuille continue du matériau fibreux (20, 22, 24, 26), caractérisée en ce qu'au moins 80 % du matériau polymère (32) sont prévus dans une zone en profondeur de 20 % du matériau fibreux (20, 22, 24, 26), en partant de la surface de contact (28) avec le matériau en feuille continue.
  2. Bande selon la revendication 1, caractérisée en ce que le matériau fibreux (20, 22, 24, 26) comprend un grand nombre de couches (20, 22, 24, 26) en le matériau fibreux, et que la majorité du matériau polymère (32) est prévue dans la couche (20), en le matériau fibreux, réalisant la surface de contact (28) avec le matériau en feuille continue.
  3. Bande selon la revendication 2, caractérisée en ce que la couche (20), en le matériau fibreux, qui réalise la surface de contact (28) avec le matériau en feuille continue, est plus mince qu'une couche (22), en le matériau fibreux, disposée en-dessous.
  4. Bande selon la revendication 2 ou 3, caractérisée en ce que la couche (20), en le matériau fibreux, réalisant la surface de contact (28) du matériau en feuille continue, est constitué de fibres allant jusqu'à 17 dtex.
  5. Bande selon l'une des revendications 1 à 4, caractérisée en ce que le matériau polymère constitue une couche polymère perméable et d'un seul tenant.
  6. Procédé de fabrication d'une bande pour une machine de fabrication d'un matériau en feuille continue, en particulier selon l'une des revendications précédentes, comprenant les mesures suivantes :
    a) la mise à disposition d'une structure support (12),
    b) le fait de prévoir d'un matériau fibreux (20, 22, 24, 26) contre la face de contact (18) du matériau en feuille continue de la structure support (12),
    c) le fait de prévoir un matériau polymère (32), pour l'essentiel seulement dans une zone en volume du matériau fibreux (20, 22, 24, 26), proche d'une face de contact (28) avec le matériau en feuille continue, le matériau polymère formant, ensemble avec les fibres du matériau fibreux (20, 22, 24, 26), une structure composite perméable au fluide, le matériau polymère ne remplissant et/ou ne recouvrant que partiellement des espaces creux formés entre des fibres du matériau fibreux (20, 22, 24, 26), et au moins 80 % du matériau polymère (32) étant prévus dans une zone en profondeur de 20 % du matériau fibreux (20, 22, 24, 26) en partant de la face de contact (28) avec le matériau en bande continue.
  7. Procédé selon la revendication 6, caractérisé en ce que la mesure b) comprend le fait de prévoir plusieurs couches (20, 22, 24, 26) en le matériau fibreux sur la structure support (12), et que la mesure c) comprend le fait de prévoir le matériau polymère (32) pour l'essentiel seulement dans une couche (20) en le matériau fibreux, réalisant une face de contact (28) avec le matériau en feuille continue.
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que la couche (20) en le matériau fibreux, réalisant une face de contact du matériau en feuille continue, est plus mince qu'une couche (22) en le matériau fibreux, disposée en-dessous.
  9. Procédé selon l'une des revendications 6 à 8, caractérisé en ce que la mesure c) comprend l'application d'une dispersion de préférence aqueuse, comprenant un matériau polymère particulaire (30), à partir d'une face de contact (18) du matériau en feuille continue, et la fusion du matériau polymère particulaire (30).
  10. Procédé selon la revendication 9, caractérisé en ce que, avant la fusion, un liquide est extrait du matériau fibreux (20, 22, 24, 26) et de la structure support (12).
  11. Procédé selon l'une des revendications 6 à 10, caractérisé en ce que la structure support est configurée comme un tissu ou une grille.
  12. Procédé selon l'une des revendications 6 à 11, caractérisé en ce que le matériau fibreux est configuré comme un non-tissé ou un feutre.
EP08161410.9A 2007-12-21 2008-07-30 Bande pour une machine destinée à la fabrication de matériaux en bande et procédé de fabrication d'une telle bande Active EP2072669B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1586307P 2007-12-21 2007-12-21

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EP2072669A1 EP2072669A1 (fr) 2009-06-24
EP2072669B1 true EP2072669B1 (fr) 2017-03-08

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EP08161410.9A Active EP2072669B1 (fr) 2007-12-21 2008-07-30 Bande pour une machine destinée à la fabrication de matériaux en bande et procédé de fabrication d'une telle bande

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US (1) US20090186544A1 (fr)
EP (1) EP2072669B1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007055801A1 (de) * 2007-12-21 2009-06-25 Voith Patent Gmbh Band für eine Maschine zur Herstellung von Bahnmaterial und Verfahren zur Herstellung eines derartigen Bands
DE102007055902A1 (de) * 2007-12-21 2009-06-25 Voith Patent Gmbh Band für eine Maschine zur Herstellung von Bahnmaterial
DE102009028215B3 (de) 2009-08-04 2010-09-09 Voith Patent Gmbh Kombination eines Pressfilzes mit einem Presswalzenbezug und/oder einem Saugwalzenbezug für eine Papiermaschine

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199401A (en) * 1979-03-01 1980-04-22 Asten Group, Inc. Felt for papermaking machine
US4781967A (en) * 1987-10-07 1988-11-01 The Draper Felt Company, Inc. Papermaker press felt
US5232768A (en) * 1988-06-09 1993-08-03 Nordiskafilt Ab Wet press fabric to be used in papermaking machine
ATE287471T1 (de) * 2000-02-23 2005-02-15 Voith Fabrics Patent Gmbh Verfahren zur herstellung eines bandes für papiermaschinen
US20050181694A1 (en) * 2002-03-09 2005-08-18 Crook Robert L. Industrial fabrics
FI20020804A0 (fi) * 2002-04-26 2002-04-26 Tamfelt Oyj Abp Järjestely paperikoneen puristinosalla
GB0306769D0 (en) * 2003-03-25 2003-04-30 Voith Fabrics Heidenheim Gmbh Composite press felt
US7455752B2 (en) * 2004-07-22 2008-11-25 Albany International Corp. Semi-permeable fabrics for transfer belt and press fabric applications
JP2006176904A (ja) * 2004-12-21 2006-07-06 Ichikawa Co Ltd 抄紙搬送フェルトおよび該抄紙搬送フェルトを備えた抄紙機のプレス装置
ATE414817T1 (de) * 2005-08-26 2008-12-15 Voith Patent Gmbh Mit fasern vermischte polymerpartikel, methode zur herstellung derselben und daraus hergestellte produkte wie z. b. pressfilze

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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US20090186544A1 (en) 2009-07-23
EP2072669A1 (fr) 2009-06-24

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