EP2072669B1 - Belt for a production machine for sheet material and method for manufacturing such a belt - Google Patents

Belt for a production machine for sheet material and method for manufacturing such a belt 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
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EP08161410.9A
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German (de)
French (fr)
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EP2072669A1 (en
Inventor
Robert Crook
Arved Westerkamp
Hubert Walkenhaus
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP2072669A1 publication Critical patent/EP2072669A1/en
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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.

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  • Nonwoven Fabrics (AREA)
  • Paper (AREA)

Description

Die vorliegende Erfindung betrifft ein Band für eine Maschine zur Herstellung von Bahnmaterial, insbesondere Papier oder Karton, sowie ein Verfahren zur Herstellung eines derartigen Bandes.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.

Ein Band gemäss dem Oberbegriff des
Anspruchs 1 ist aus EP1757728A1 bekannt.A volume according to the generic term of the
Claim 1 is made EP1757728A1 known.

Beispielsweise in Trockensektionen von Papiermaschinen werden Bänder eingesetzt, welche das zu fertigende Bahnmaterial durch beispielsweise zwischen zwei Presswalzen gebildete Pressnips hindurch bewegen. Durch die physikalische Belastung wird das zu fertigende Bahnmaterial komprimiert und es wird Flüssigkeit aus diesem herausgepresst. Die Flüssigkeit soll in dem das Bahnmaterial kontaktierende Band aufgenommen und über dieses abgeführt werden. Es ist grundsätzlich also die Zielsetzung, ein derartiges Band so zu gestalten, dass es einen hohen Flüssigkeitsanteil so aufnehmen kann, dass nach dem Durchlauf eines Pressnips, also beim Entspannen, diese Flüssigkeit nicht wieder zurück an die Oberfläche des Bahnmaterials gelangt und dass die Oberflächenstruktur des Bands, sofern dies nicht gewünscht ist, sich nicht in der Oberfläche des zu fertigenden Bahnmaterials abzeichnet. Hierzu ist es beispielsweise bekannt, ein derartiges Band an seiner Oberfläche mit dünnen Materiallagen zu überziehen, die, um einen Flüssigkeitsdurchtritt zu ermöglichen, mit einer Vielzahl an Öffnungen versehen sind. Die Herstellung derartiger Bänder ist sehr aufwendig und führt oftmals zu einer ungenügenden Wasserabführeigenschaft sowie auch zu einer Markierungsneigung.For example, in dry sections of paper machines, belts are used 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. For this purpose, it is known, for example, to cover such a band on its surface with thin layers of material which, in order to allow a passage of liquid, are provided with a multiplicity of openings. The production of such bands is very complicated and often leads to an insufficient Wasserabführeigenschaft and also to a tendency to mark.

Es ist die Aufgabe der vorliegenden Erfindung, ein Band für eine Maschine zur Herstellung von Bahnmaterial, insbesondere Papier oder Karton, sowie ein Verfahren zur Herstellung eines derartigen Bands vorzusehen, mit welchen bei guter Flüssigkeitsabführeigenschaft die Markierung des zu fertigenden Bahnmaterials weitestgehend ausgeschlossen werden kann.It is the object of the present invention to provide a belt for a machine for producing web material, in particular paper or cardboard, and a method for producing such a belt, with which, with good liquid removal property, the marking of the web material to be produced can be largely excluded.

Erfindungsgemäß wird diese Aufgabe gelöst durch ein Band, insbesondere Pressfilz, für eine Maschine zur Herstellung von Bahnmaterial, insbesondere Papier oder Karton, umfassend eine Tragestruktur und an einer Bahnmaterialkontaktseite der Tragestruktur Fasermaterial mit darin enthaltenem Polymermaterial, insbesondere mit darin enthaltenem thermoplastischem Polyurethanmaterial welches zusammen mit Fasern des Fasermaterials eine für Fluid permeable Verbundstruktur bildet, indem das Polymermaterial zwischen Fasern des Fasermaterials des gebildete Hohlräume nur teilweise füllt und/oder überbrückt, wobei ein Großteil des Polymermaterials in einem einer Bahnmaterialkontaktfläche des Fasermaterials nahen Volumenbereich vorgesehen ist. Dabei sind wenigstens 80% des Polymermaterials in einem Tiefenbereich von 20% des Fasermaterials ausgehend von der Bahnmaterialkontaktfläche vorgesehen.According to the invention this object is achieved by 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.

Mit anderen Worten wird im Bereich der Bahnmaterialkontaktfläche durch Fasern des Fasermaterials und das Polymermaterial eine permeable Verbundstruktur gebildet. Hierbei sind die Fasern in das Polymermaterial zumindest teilweise eingebettet. Die Porosität der Verbundstruktur wird hierbei dadurch gebildet, indem das Polymermaterial zwischen Fasern des Fasermaterials der gebildeten Hohlräume nur teilweise füllt und/oder überbrückt. Dies bedeutet, dass das Polymermaterial selbst nicht porös, wie bspw. geschäumt, ist.In other words, 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. Here, 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.

Da bei dem erfindungsgemäß aufgebauten Band das in dem Fasermaterial enthaltene Polymermaterial in einem oberflächennahen bzw. auch im Wesentlichen eine Bahnmaterialkontaktfläche bereitstellenden Bereich des Fasermaterials vorgesehen ist, ist durch dieses Polymermaterial eine überwiegend plattenartige Konfiguration gebildet, die gleichwohl Flüssigkeit durchtreten lässt. Da dieses Polymermaterial in die Struktur des Fasermaterials eingebettet ist, wird diese Struktur des Fasermaterials sich auch an der Bahnmaterialkontaktfläche nach Art einer Mikrostrukturierung abzeichnen, die einerseits zwar nicht so stark ist, dass sie sich im zu fertigenden Bahnmaterial abzeichnet, die andererseits jedoch aufgrund der vorhandenen Unregelmäßigkeit und in Verbindung mit der Porosität ein deutlich besseres Freigeben eines derartigen Bandes von dem zu fertigenden Bahnmaterial ermöglicht.Since, in the band constructed according to the invention, 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. As 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.

Das erfindungsgemäße Band kann eine Mehrzahl von Lagen aus Fasermaterial umfassen, wobei dann der Großteil des Polymermaterials in der die Bahnmaterialkontaktfläche bereitstellenden Lage aus Fasermaterial vorgesehen ist.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.

Um in Verbindung mit dem Polymermaterial die gewünschte Hohlraumstruktur und mithin auch die gewünschte Flüssigkeitsaufnahmeeigenschaft noch effizienter bereitstellen zu können, wird weiter vorgeschlagen, dass die die Bahnmaterialkontaktfläche bereitstellende Lage aus Fasermaterial feiner ist, als eine darunter liegende Lage aus Fasermaterial. Beispielsweise kann vorgesehen sein, dass die die Bahnmaterialkontaktfläche bereitstellende Lage aus Fasermaterial mit Fasern mit bis zu 17 dtex aufgebaut ist. Es sei in diesem Zusammenhang darauf hingewiesen, dass im Sinne der vorliegenden Erfindung der Ausdruck "feiner" bedeutet, dass in einer derartigen Lage ein geringerer Anteil an Hohlräumen vorhanden ist, als in einer gröberen Lage. Dies kann beispielsweise durch Einsatz von Fasern mit vergleichsweise geringem dtex-Wert erreicht werden, andererseits aber auch beeinflusst werden durch die Dichte einer derartigen Lage.In order to be able to provide the desired cavity structure, and therefore also the desired liquid absorption property, more efficiently in conjunction with the polymer material, it is further proposed that the layer of fiber material providing the web material contact surface be finer than an underlying layer of fiber material. For example, it may be provided that the layer of fiber material providing the web material contact surface is constructed with fibers of up to 17 dtex. It should be noted in this context that for the purposes of the present invention, 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.

Vorzugsweise bildet das Polymermaterial eine einstückige und permeable Polymerschicht aus. Mit anderen Worten wird eine einstückige und permeable Polymerschicht gebildet, die sich im Bereich der Bahnmaterialkontaktfläche im Fasermaterial erstreckt und in die Fasern des Fasermaterials zumindest teilweise eingebettet ist. Die Polymerschicht ist hierbei fest mit den Fasern verbunden.Preferably, the polymeric material forms a one-piece and permeable polymer layer. In other words, 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.

Unter einer einstückigen Polymerschicht ist hierbei eine Polymerschicht zu verstehen, die aus einem einzigen zusammenhängenden Stück gebildet ist. Zur Bereitstellung der Permeabilität weist die Polymerschicht sich durch diese erstreckende Öffnungen auf, wobei die Öffnungen in der Polymerschicht dadurch gebildet sind, indem das die Polymerschicht bildende Polymermaterial zwischen Fasern der Faserlage gebildete Hohlräume nur teilweise füllt und/oder überbrückt. Zum Nachweis der Einstückigkeit der permeablen Polymerschicht kann das Fasermaterial, wenn dieses bspw. aus Polyamid ist, bspw. mittels Ameisensäure herausgelöst werden.A one-piece polymer layer is to be understood here as meaning a polymer layer which is formed from a single coherent piece. To provide the permeability, 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. To demonstrate the integrity of the permeable polymer layer, the fiber material, if it is, for example, of polyamide, for example, be dissolved out by means of formic acid.

Die einstückige und permeable Polymerschicht bildet mit Fasern des Fasermaterials eine permeable Verbundstruktur, die ein hohes und sich im Betrieb wenig kompaktierendes Wasserdrainagevermögen bereitstellt. Dadurch, dass das Polymermaterial eine einstückige Polymerschicht ausbildet, kann sich das Polymermaterial bei Einwirkung von Scherkräften oder Hochdruckwasserstrahl deutlich schwerer aus dem Fasermaterial lösen, als dies bei Polymermaterial der Fall ist, welches in dem Fasermaterial nur eine Vielzahl unzusammenhängender Polymeragglomerate bildet.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 fact that the polymer material forms a one-piece polymer layer, the polymer material can significantly harder to solve from the fiber material under the action of shear forces or high pressure water jet, as is the case with polymer material, which forms in the fiber material only a variety of discontinuous polymer agglomerates.

Die eingangs genannte Aufgabe wird weiter gelöst durch ein Verfahren zur Herstellung eines Bands für eine Maschine zur Herstellung von Bahnmaterial, insbesondere nach einem der vorangehenden Ansprüche, umfassend die Maßnahmen:

  1. a) Bereitstellen einer Tragestruktur,
  2. b) Vorsehen von Fasermaterial an einer Bahnmaterialkontaktseite der Tragestruktur,
  3. c) Vorsehen von Polymermaterial im Wesentlichen nur in einem einer Bahnmaterialkontaktfläche nahen Volumenbereich des Fasermaterials, wobei das Polymermaterial zusammen mit Fasern des Fasermaterials eine permeable Verbundstruktur bildet, indem das Polymermaterial zwischen Fasern des Fasermaterials die gebildeten Hohlräume nur teilweise füllt und/oder überbrückt.
The above-mentioned object is further achieved by a method for producing a belt for a machine for producing web material, in particular according to one of the preceding claims, comprising the measures:
  1. a) providing a carrying structure,
  2. b) providing fiber material on a web material contact side of the support structure,
  3. c) providing polymer material substantially only in a volume range of the fiber material which is close to a web material contact surface, the polymer material together with fibers of the fiber material forms a permeable composite structure in that the polymer material between fibers of the fiber material only partially fills and / or bridges the cavities formed.

Um die gewünschte Schichtung in einfacher Weise erhalten zu können, wird weiter vorgeschlagen, dass die Maßnahme b) das Vorsehen mehrerer Lagen aus Fasermaterial an der Tragestruktur umfasst und dass die Maßnahme c) das Vorsehen des Polymermaterials im Wesentlichen nur in einer eine Bahnmaterialkontaktfläche bereitstellenden Lage aus Fasermaterial umfasst.In order to be able to obtain the desired layering in a simple manner, it is further proposed that 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.

Die die Bahnmaterialkontaktfläche bereitstellende Lage aus Fasermaterial kann feiner sein, als eine darunter liegende Lage aus Fasermaterial. Dies führt dazu, dass durch die die Bahnmaterialkontaktfläche bereitstellende und auch das Polymermaterial enthaltende Lage hindurchgetretene Flüssigkeit sich sehr schnell durch die gröbere Struktur der darunter liegende Lage hindurchbewegen kann, so dass die Gefahr einer Rückbefeuchtung deutlich vermindert werden kann.The fibrous material layer providing the web material contact surface may be finer than an underlying fibrous material layer. As a result, 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.

Die Maßnahme c) kann das Aufbringen einer vorzugsweise wässrigen Dispersion mit partikelartigem Polymermaterial von einer Bahnmaterialkontaktseite und das Aufschmelzen des partikelartigen Polymermaterials umfassen. Dabei kann vor dem Aufschmelzen die in Verbindung mit der Dispersion eingeführte Flüssigkeit aus dem Fasermaterial bzw. Tragestruktur abgezogen werden.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.

Die Tragestruktur kann beispielsweise gewebeartig oder gelegeartig ausgebildet sein. Das Fasermaterial kann vliesartig bzw. filzartig ausgebildet sein.The support structure may be formed, for example, tissue-like or random. The fiber material may be non-woven or felt-like.

Die vorliegende Erfindung wird nachfolgend mit Bezug auf die beiliegenden Figuren detailliert beschrieben. Es zeigt:

Fig. 1
eine Prinzip-Schnittansicht eines erfindungsgemäß aufgebauten Bandes;
Fig. 2
eine prinzipartige Draufsicht auf eine Bahnmaterialkontaktfläche des Bandes der Fig. 1;
Fig. 3
eine Elektronenmikroskopaufnahme einer Bahnmaterialkontaktfläche eines erfindungsgemäß aufgebauten Bandes;
Fig. 4
eine weitere Elektronenmikroskopaufnahme einer Bahnmaterialkontaktfläche mit anderer Oberflächenstrukturierung.
The present invention will be described below in detail with reference to the accompanying drawings. It shows:
Fig. 1
a principle sectional view of a band constructed according to the invention;
Fig. 2
a principle-like plan view of a web material contact surface of the band Fig. 1 ;
Fig. 3
an electron micrograph of a web material contact surface of a band constructed according to the invention;
Fig. 4
another electron micrograph of a web material contact surface with a different surface structuring.

In Fig. 1 ist ein im Schnitt und prinzipartig dargestelltes Band allgemein mit 10 bezeichnet. Dieses beispielsweise in Endloskonfiguration bereitgestellte Band 10 kann in einer Trockensektion einer Papiermaschine eingesetzt werden. Es weist eine die mechanische Belastung insbesondere in Bandlängsrichtung und in Bandquerrichtung aufnehmende Tragestruktur 12 auf. Diese Tragestruktur 12 kann beispielsweise als Gewebe, als Gelege oder auch als Spiral-Link-Struktur ausgebildet sein. An einer Maschinenkontaktseite 14 der Tragestruktur 12 kann eine Lage 16 aus Fasermaterial vorgesehen sein, also beispielsweise eine Filzlage oder eine Vlieslage, die mit der Tragestruktur 12 beispielsweise durch Vernadeln verbunden sein kann. An einer Bahnmaterialkontaktseite 18 sind in der dargestellten Ausgestaltungsform insgesamt vier Lagen 20, 22, 24, 26 aus Fasermaterial vorgesehen, welche ebenfalls vlies- bzw. filzartig ausgebildet sein können. Auch diese Lagen 20, 22, 24, 26 können mit der Tragestruktur 12 durch Vernadeln fest verbunden sein.In 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. On 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.

Man erkennt, dass vor allem in der eine Bahnmaterialkontaktfläche 28 bereitstellenden Lage 20 aus Fasermaterial eine Vielzahl von Partikeln 30 aus Polymermaterial vorgesehen sind. Auch in der unmittelbar darunter liegenden Lage 22 aus Fasermaterial bzw. in weiteren Lagen 24, 26 aus Fasermaterial können derartige Partikel 30 noch vorhanden sein, wobei jedoch ein Großteil, also beispielsweise zumindest die Hälfte der Partikel 30 in der obersten und die Bahnmaterialkontaktfläche 28 bereitstellenden Lage 20 aus Fasermaterial enthalten sind.It can be seen that, especially in the layer 20 of fiber material providing a web material contact surface 28, 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.

Die Fig. 1 zeigt das erfindungsgemäß aufgebaute Band 10 in einer Zwischenproduktionsphase, und zwar nach dem festen Verbinden der verschiedenen Lagen 20, 22, 24, 26 und ggf. 16 aus Fasermaterial mit der Tragestruktur 12, vorzugsweise durch Vernadeln und auch nach dem Einbringen der Partikel 30 aus Polymermaterial. Dieses Einbringen der Partikel 30 kann dadurch erfolgen, dass nach dem Verbinden der Lagen 20, 22, 24, 26 aus Fasermaterial mit der Tragestruktur 12 eine beispielsweise wässrige Dispersion, in welcher die Partikel 30 enthalten sind, auf die Bahnmaterialkontaktfläche 28 aufgebracht wird. Mit dieser wässrigen Dispersion werden die Partikel 30 auch in den Innenvolumenbereich eingetragen, so dass sich die in der Fig. 1 erkennbare Verteilung ergibt. Um dafür zu sorgen, dass ein Großteil dieser Partikel 30 im oberflächennahen Bereich, also primär der Lage 20 aus Fasermaterial, verbleibt, ist die Lage 20 mit derart feiner Struktur ausgebildet, dass insbesondere auch unter Abstimmung auf die Größe bzw. mittlere Größe der Partikel 30 diese primär in der Lage 20 aus Fasermaterial bleiben. Hierzu wird also diese Lage 20 aus Fasermaterial beispielsweise aus Fasern mit vergleichsweise geringer dtex-Zahl, beispielsweise unter 20 dtex, und auch vergleichsweise hoher Dichte, also hohem Faseranteil pro Volumeneinheit, bereitgestellt, so dass die in dieser Lage 20 aus Fasermaterial verbleibenden Poren so klein sind, dass ein Großteil der Partikel 30 sich darin verfängt. Die Fasern der Lage 20 aus Fasermaterial können mit einem dtex-Wert im Bereich von 6 bis 17 ausgebildet sein, während beispielsweise die unmittelbar darunter liegende Lage 22 aus Fasermaterial mit Fasern mit einem dtex-Wert im Bereich von 44 aufgebaut sein kann. Dabei kann die Größenverteilung dieser Partikel 30 so sein, dass wenigstens 50% derselben eine Größe im Bereich von 20 bis 200 µm aufweisen. Einige der kleineren Partikel können selbstverständlich auch in die nächste Lage 22 aus Fasermaterial gelangen und sich dort in den Poren verfangen. Die Dichte der Partikel 30 nimmt jedoch in Richtung von der Bahnmaterialkontaktfläche 28 stark ab, so dass im Wesentlichen nur innerhalb der ersten 30% der Tiefe, gemessen ausgehend von der Bahnmaterialkontaktfläche 28, derartige Partikel in relevantem Ausmaß vorhanden sind. Vorzugsweise sind in den ersten 20% der Tiefe mindestens 80% der Partikel 28 vorhanden. Werden die unter der ersten Lage 20 aus Fasermaterial liegenden Lagen 22, 24, 26 mit deutlich gröberer Struktur, also auch größerem Porenvolumen ausgebildet, so kann beispielsweise dafür gesorgt werden, dass die über die Lage 20 hinaustretenden Partikel 30 sich auch in diesen Lagen und insbesondere auf der Tragestruktur 12 nicht verfangen, so dass sie zusammen mit der beispielsweise durch Unterdruck, durch ein Gebläse oder durch Trocknen abgezogenen Flüssigkeit wieder aus dem Band 10 austreten.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. In order to ensure that a large part of these particles 30 remains in the near-surface region, ie primarily the layer 20 of fiber material, the layer 20 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. For this purpose, therefore, 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. In this case, 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. Of course, some of the smaller particles can also get into the next layer 22 of fiber material and get caught in the pores there. However, 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. Preferably, 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.

Nach dem Einbringen der Partikel 30 wird das Band 10 beispielsweise durch den Hindurchlauf durch zwei erwärmte Walzen erwärmt, und zwar über die Schmelztemperatur des Polymermaterials der Partikel 30. Auch das Erwärmen in einer entsprechenden Heizkammer ist möglich. Dabei kann das Band beispielsweise zwei Minuten lang auf eine Temperatur von ungefähr 200°C erwärmt werden. Der Schmelzpunkt von thermoplastischem Polyurethanmaterial, das beispielsweise für die Partikel 30 eingesetzt werden kann, liegt bei etwa 187°C, während der Schmelzpunkt der für das Fasermaterial eingesetzten Polyamid 6 Fasern bei etwa 223°C liegt. Dies bedeutet, dass zwar das Material der Partikel 28 aufschmelzen wird, die Fasern des Fasermaterials jedoch ihre Struktur beibehalten werden. Das aufschmelzende Polymermaterial verteilt sich dann in der porösen Struktur der dieses jeweils enthaltenden Lage aus Fasermaterial, so dass sich in dieser jeweiligen Lage, wie in Fig. 2 veranschaulicht, Polymermaterial 32 bilden wird, welches zusammen mit Fasern der Lage eine permeable Verbundstruktur bildet indem das Polymermaterial Hohlräume, die zwischen Fasern der Lage gebildet sind, nur teilweise füllt und/oder überbrückt (siehe Figuren 3 und 4). Die durch die aufschmelzenden Partikel entstehenden Volumenbereiche des Polymermaterials 33 stehen miteinander in Verbindung und bilden eine Struktur mit einer Vielzahl von Poren 34 dazwischen. Das Polymermaterial wird insbesondere auch die Fasern umgeben bzw. diese in deren Kreuzungspunkten miteinander verbinden, so dass die in den Fig. 3 und 4 erkennbare permeable Verbundstruktur aus dem Polymermaterial und dem in das Polymermaterial eingebetteten Fasermaterial erhalten wird. An der in den Fig. 3 und 4 auch erkennbaren Bahnmaterialkontaktfläche dieses plattenartigen Verbundes von Polymermaterial besteht eine Mikrostrukturierung durch die Fasern in dem Polymermaterial gebildeten Erhöhungen. Diese Strukturierung ist zu klein, um sich in dem mit einem derartigen Band herzustellenden Bahnmaterial abzuzeichnen, erleichtert jedoch das Loslösen des Bandes von dem Bahnmaterial, insbesondere auch dadurch, da die die Bahnmaterialkontaktfläche bereitstellende Verbundstruktur eine sehr große Anzahl offener Poren hat.After the particles 30 have been introduced, 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. In this case, 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. 2 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. At the in the 3 and 4 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.

In der vorliegenden Ausführungsform bildet das im Bereich der Bahnmaterialkontaktfläche angeordnete Polymermaterial eine einstückige und permeable Polymerschicht aus.In the present embodiment, the polymer material disposed in the region of the web material contact surface forms a one-piece and permeable polymer layer.

Es ist selbstverständlich, dass die Prinzipien der Erfindung auch mit anderen Ausgestaltungen realisiert sein können. So könnte beispielsweise die Anzahl der Lagen aus Fasermaterial von der gezeigten Anzahl abweichen. Auch bei nur einer beispielsweise dickeren Lage aus Fasermaterial kann durch entsprechende Abstimmung der Partikelgröße einerseits und der Feinheit der Lage andererseits dafür gesorgt werden, dass ein Großteil der Partikel sich im oberflächennahen Bereich ansammeln wird, so dass beim Aufschmelzen und Wiederverhärten sich ebenfalls die plattenartige Konfiguration mit gleichwohl hoher Porosität ergeben wird.It is to be understood that the principles of the invention may be practiced with other embodiments. For example, the number of layers of fiber material could differ from the number shown. Even with only one example, 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.

Claims (12)

  1. Belt for a machine for producing web material, in particular paper or board, comprising a carrier structure (12) and, on a web-material contact side (18) of the carrier structure (12), fibre material (20, 22, 24, 26) containing polymer material (32), in particular containing thermoplastic polyurethane material (32), which, together with fibres of the fibre material (20, 22, 24, 26), forms a composite structure that is permeable to fluid in that the polymer material only partially fills and/or bridges cavities formed between fibres of the fibre material (20, 22, 24, 26), and a majority of the polymer material (32) is provided in a volume region close to a web-material contact surface (28) of the fibre material (20, 22, 24, 26), characterized in that at least 80% of the polymer material (32) is provided in a depth range of 20% of the fibre material (20, 22, 24, 26) starting from the web-material contact surface (28).
  2. Belt according to Claim 1,
    characterized in that the fibre material (20, 22, 24, 26) comprises a plurality of fibre-material layers (20, 22, 24, 26), and in that the majority of the polymer material (32) is provided in the fibre-material layer (20) that provides the web-material contact surface (28).
  3. Belt according to Claim 2,
    characterized in that the fibre-material layer (20) that provides the web-material contact surface (28) is finer than an underlying fibre-material layer (22).
  4. Belt according to Claim 2 or 3,
    characterized in that the fibre-material layer (20) that provides the web-material contact surface (28) is constructed from fibre material having fibres having up to 17 dtex.
  5. Belt according to one of Claims 1 to 4,
    characterized in that the polymer material forms an integral and permeable polymer layer.
  6. Method for producing a belt for a machine for producing web material, in particular according to one of the preceding claims, comprising the measures of:
    a) providing a carrier structure (12),
    b) providing fibre material (20, 22, 24, 26) on a web-material contact side (18) of the carrier structure (12),
    c) providing polymer material (32) substantially only in a volume region, close to a web-material contact surface (28), of the fibre material (20, 22, 24, 26), wherein the polymer material, together with fibres of the fibre material (20, 22, 24, 26), forms a composite structure that is permeable to fluid in that the polymer material only partially fills and/or bridges cavities formed between fibres of the fibre material (20, 22, 24, 26), and at least 80% of the polymer material (32) is provided in a depth range of 20% of the fibre material (20, 22, 24, 26) starting from the web-material contact surface (28).
  7. Method according to Claim 6,
    characterized in that measure b) comprises the provision of several fibre-material layers (20, 22, 24, 26) on the carrier structure (12), and in that measure c) comprises the provision of the polymer material (32) substantially only in a fibre-material layer (20) that provides a web-material contact surface (28).
  8. Method according to Claim 6 or 7,
    characterized in that the fibre-material layer (20) that provides a web-material contact surface is finer than an underlying fibre-material layer (22).
  9. Method according to one of Claims 6 to 8,
    characterized in that measure c) comprises the application of a preferably aqueous dispersion with particle-like polymer material (30) from a web-material contact side (18) and the melting of the particle-like polymer material (30).
  10. Method according to Claim 9,
    characterized in that, prior to the melting operation, liquid is extracted from the fibre material (20, 22, 24, 26) and the carrier structure (12).
  11. Method according to one of Claims 6 to 10,
    characterized in that the carrier structure is formed in the manner of a woven fabric or laid fabric.
  12. Method according to one of Claims 6 to 11,
    characterized in that the fibre material is formed in the manner of a nonwoven or felt.
EP08161410.9A 2007-12-21 2008-07-30 Belt for a production machine for sheet material and method for manufacturing such a belt Active EP2072669B1 (en)

Applications Claiming Priority (1)

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

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EP2072669A1 EP2072669A1 (en) 2009-06-24
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EP (1) EP2072669B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007055801A1 (en) * 2007-12-21 2009-06-25 Voith Patent Gmbh Belt for a machine for producing web material and method for producing such a belt
DE102007055902A1 (en) * 2007-12-21 2009-06-25 Voith Patent Gmbh Tape for a machine for the production of web material
DE102009028215B3 (en) 2009-08-04 2010-09-09 Voith Patent Gmbh Combination of a press felt with a press roll cover and / or a suction roll cover for a paper machine

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
EP1127976B1 (en) * 2000-02-23 2005-01-19 Voith Fabrics Patent GmbH Process for producing a papermachine belt
US20050181694A1 (en) * 2002-03-09 2005-08-18 Crook Robert L. Industrial fabrics
FI20020804A0 (en) * 2002-04-26 2002-04-26 Tamfelt Oyj Abp Arrangement in the paper machine press section
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 (en) * 2004-12-21 2006-07-06 Ichikawa Co Ltd Conveyor felt for papermaking, and press device of paper machine having the conveyor felt for papermaking
ATE414817T1 (en) * 2005-08-26 2008-12-15 Voith Patent Gmbh POLYMER PARTICLES MIXED WITH FIBERS, METHOD FOR PRODUCING THE SAME AND PRODUCTS MADE THEREFROM, SUCH AS PRESSED FELT

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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