EP2072675A2 - Bande pour une machine destinée à la fabrication de matériau en bande - Google Patents

Bande pour une machine destinée à la fabrication de matériau en bande Download PDF

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Publication number
EP2072675A2
EP2072675A2 EP20080166851 EP08166851A EP2072675A2 EP 2072675 A2 EP2072675 A2 EP 2072675A2 EP 20080166851 EP20080166851 EP 20080166851 EP 08166851 A EP08166851 A EP 08166851A EP 2072675 A2 EP2072675 A2 EP 2072675A2
Authority
EP
European Patent Office
Prior art keywords
polymer material
layer
fibers
web
fiber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20080166851
Other languages
German (de)
English (en)
Other versions
EP2072675A3 (fr
Inventor
Arved Westerkamp
Robert Eberhardt
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
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 filed Critical Voith Patent GmbH
Publication of EP2072675A2 publication Critical patent/EP2072675A2/fr
Publication of EP2072675A3 publication Critical patent/EP2072675A3/fr
Withdrawn legal-status Critical Current

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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
    • 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]
    • 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]
    • Y10T442/3146—Strand material is composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material

Definitions

  • the present invention relates to a belt for a machine for producing web material, in particular paper or cardboard, and to a machine for producing and / or treating a fibrous web.
  • the endless belts used, for example, in press sections of paper machines move together with the web material to be produced through one or more press nips, where, on the one hand, the web material is compacted, on the other hand, liquid is pressed out of it by the pressing together of two rollers with the interposition of the belt and the web material to be produced becomes.
  • the pressed-out liquid should be removed with or through the band.
  • this band it is necessary to provide this band with a structure suitable for receiving the liquid permeable or voided structure.
  • such a structure is of course also subject to the pressing load occurring in the region of a press nip, so that the risk of material fatigue due to the constant compression and relaxation or the permeability and thus the available cavities over the service life can decrease sharply.
  • this object is achieved by a belt for a machine for producing web material, in particular paper or cardboard, which is permeable to a fluid and which comprises an elastomer polymer material whose total weight accounts for more than 50% , preferably has more than 60% of the total weight of the band.
  • the invention provides that the total weight of the elastomeric polymer material contained in the band has a proportion of more than 50%, preferably more than 60%, of the total weight of the band.
  • the high weight fraction of elastomeric polymer material in the belt provides a belt with high wear resistance, durable void volume and high damping capacity.
  • the tape according to the invention comprises a support structure and at least one layer of fiber material, wherein fibers of the one or more layers of fiber material and / or the support structure are at least partially embedded in the elastomeric polymer material.
  • a band is still due to the very high weight fraction of elastomeric polymer material in the band associated with the fact that fibers of the fiber layer and / or the support structure are at least partially embedded in the elastomeric polymer material permanent constant void volume provided. Furthermore, a very high vibration damping is achieved by the very high weight fraction of elastomeric polymer material, which is firmly connected to fibers of at least one fiber layer and / or with the support structure. Furthermore, due to the very high weight fraction of elastomeric polymer material in the belt, the machine side wear and paper side fiber loss can be significantly reduced because the elastomeric polymer material significantly better bonds the fibers of the fiber layer containing it and the polymer material can provide a wear volume.
  • a preferred embodiment of the invention provides that the proportion of the weight of the polymer material in the total weight of the strip in the thickness direction of the strip varies locally.
  • the proportion of the weight of the polymer material in the total weight of the strip in the thickness direction of the belt may be locally constant.
  • the elastomeric polymer material comprises a first elastomeric polymer material which at least partially covers fibers of the at least one layer with a film.
  • the first elastomeric polymeric material may comprise elastomeric polyurethane.
  • the first polymer material is an elastomeric polyurethane.
  • the first polymer material may in this case, for example, in the form of an aqueous Dispersion of particulate, in particular fine particulate, first polymer material are applied in the at least one layer of fiber material. Subsequently, the dispersion introduced into the fiber layer is deprived of liquid, whereby the film covering the fibers is formed from the first polymer material. This means that the fibers of the at least one fiber layer covering film substantially, in particular completely, is formed by the liquid is withdrawn from the particulate polymer dispersion (from the other polymer material) and the polymer particles form a film forming on the fibers.
  • aqueous dispersions are known, for example, under the name "witcobond polymer dispersion" and are obtained, for example, from Baxenden Chemicals Ltd. distributed in England.
  • At least a portion of the fibers of the at least one layer of fibrous material may be coated with multiple film layers of first polymeric materials. It is conceivable in this connection that at least some of the several film layers have mutually different properties. These different properties may, for example, result from mutually different first polymer materials which are used for the respective film layers.
  • the fiber of the first polymer material covering at least one fiber layer may be most preferred to a depth of 10% to 100%, preferably to a depth of 30% to 100% to a depth of 50% to 100%, based on the total thickness of the strip.
  • the elastomeric polymeric material may include second elastomeric polymeric material which forms a permeable composite structure with fibers of the at least one layer in that only partial voids are filled and / or bridged by the polymeric material formed between fibers of that layer.
  • the fibrous material layer containing the second polymeric material may be, for example, the fibrous material layer providing the web material contact surface.
  • the second polymer material is introduced in particle form in preferably aqueous dispersion in the at least one layer of fiber material and subsequently melted.
  • the permeable composite structure comprising the second polymer material is formed by melting the second polymer material after its introduction into the at least one layer of fibrous material, attaching itself to the fibers and subsequently solidifying the molten polymer material adhesively to the fibers.
  • liquid may preferably be removed from the at least one layer of fiber material, such as, for example, drawn off before the melting of the particulate second polymer material.
  • the second elastomeric polymer material preferably forms a one-piece and permeable polymer layer.
  • a one-piece and permeable polymer layer is formed, which extends in the position of fiber material and are at least partially embedded in the fibers of the layer of fiber material.
  • the polymer layer is in this case firmly connected to the fibers, which embeds them at least in sections.
  • 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 polymer layer is permeable to fluid, it is preferred that this polymeric material be impermeable to fluid itself.
  • the permeability of the polymer layer in the context of the present embodiment is rather formed by the fact that the polymer material only partially fills and / or bridges voids which are formed between fibers of the layer of fiber material.
  • the one-piece and fluid-permeable polymer layer forms a permeable composite structure with fibers of the fiber layer which provides a high and poorly compacted water drainage capability in operation.
  • the polymer layer extends over the entire length and the entire width of the layer of fiber material.
  • the polymer layer thus forms an independent layer in the position of fiber material. It is thereby provided a tape which has constant properties over its width, such as, for example, dewatering performance, return capability and the like has.
  • the polymer layer extends over the entire length and only part of the width of the layer of fiber material. It is conceivable in this context, for example., In the position of fiber material in the region of the respective longitudinal edge to arrange a polymer layer which extends only over a portion of the width of the layer of fiber material. It is also conceivable that the polymer layer extends only in the region of the middle of the layer of fiber material and in the region of the two longitudinal edges of the layer of fiber material no polymer layer is arranged.
  • the polymer layer is elastically compressible.
  • the polymer layer may have a hardness in the range of 50 to 97 Shore A.
  • the second polymer material is an elastomeric polyurethane, in particular a thermoplastic elastomeric polyurethane.
  • the polymer layer has a thickness in the range of about 0.05 mm to about 1.5 mm, preferably about 0.05 mm to about 1.0 mm.
  • the polymer layer may extend over the entire thickness of the layer of fibrous material or, alternatively, for the polymer layer to extend only over part of the thickness of the layer of fibrous material.
  • a preferred embodiment of the invention provides that in at least one of the layers of fiber material, both the first and the second elastomeric polymer material is arranged.
  • the effects generated by the two polymer materials interact.
  • the fibers or at least part of them are coated with the further film-forming polymer material and are thereby supported or stiffened in their structure.
  • this coating can form a crosslinking of the individual fibers with one another, so that, taking into account the elastic properties of the polymer material intended for the coating, a significantly better return characteristic can be combined with reduced material fatigue.
  • a permeable composite structure forming polymer material which bridges and / or fills cavities between the already fibers of at least one fiber layer, the water absorption and Abriostage this location can be adjusted.
  • the second polymer material is preferably at least partially, in particular completely, attached to portions of the fibers which are already coated with the film forming first polymer material.
  • the polymer material forming the first polymer material acts as a bonding agent between the second polymer material and the fibers of the at least one fiber layer, whereby the connection of the second polymer material to the fibers of the fiber layer is significantly improved.
  • the fibers are coated with the intended first polymer material, for example by application of a film-forming polymer dispersion and subsequent drying or removal of the liquid medium. Only then is the order of the, preferably particulate second polymer material. If the process is conducted so that the second polymer material in places of the fibers As a result of a drying and reflow process, a bond of the second polymeric material with the already polymer-coated fibers forms a permeable, highly elastic composite structure for web transport in the web-forming machine we
  • Another development of the invention provides that the at least one layer of fiber material which contains the first and the second polymer material after the two polymer materials have been applied are compressed using pressure and / or temperature. As a result, precompaction and / or smoothing of this layer is achieved.
  • At least some of the fibers of the at least one fiber layer are glued together at fiber crossing and / or fiber contact locations by the first polymeric material forming the film.
  • the bonding of the fibers of the layer forms a coherent network of interconnected fibers. This fiber network contributes significantly to the elastic properties and the recovery capability of the at least one layer of fibrous material.
  • the fiber having the film-coating first polymer material has a higher melting point than that, in particular the one-piece and permeable polymer layer forming second polymer material.
  • the second polymer material after the fibers have already been coated with the film of the first polymer material without adversely affecting the film coating the fibers in the heating required to melt the starting material for the second polymeric material.
  • the fiber of the first polymer material, at least partially covering the fibers, preferably has a thickness in the range from 1 ⁇ m to 20 ⁇ m.
  • first polymer material and the second polymer material have mutually different elastic properties.
  • the first polymer material in particle form may have a smaller particle size than the second polymer material in particle form.
  • At least 50% of the particles of the fine particulate first polymer material have a size in the range from 2.0 nm to 10 ⁇ m. It is conceivable in this context that all particles of the fine particulate further polymer material have a size of not more than 10 .mu.m, in particular of not more than 2 .mu.m.
  • the layer providing the web material contact surface of the band may contain at least the second polymer material, wherein the second polymer material is preferably arranged in the area of the web material contact surface so that the permeable composite structure provides the web material contact surface.
  • the second polymer material forms a one-piece and permeable polymer layer, it extends in the region of the web material contact surface and provides large local area elements, whereby significantly lower local pressure differences are produced on the web material contact surface as the strip according to the invention passes through a press nip than in the case of an uncoated web material contact surface providing fiber layer. This has a particularly positive effect on a uniform and mark-free drainage of the paper web in the press nip.
  • the second polymer material In order to influence only the web material contact surface of the band without its volume range, it makes sense if the second polymer material, starting from the web material contact surface to a depth of 10% to 50%, preferably to a depth of 10% to 30%, especially preferably to a depth of 10% to 20% based on the total thickness of the strip. As a result, essentially only the web material contact surface is influenced by the second polymer material.
  • the layer of fibrous material containing the second polymer material provides a machine contact surface of the tape and in particular if the second polymer material is arranged in the region of the machine contact surface so that the permeable composite structure provides the machine contact surface of the tape.
  • the layer of fiber material which provides the machine contact surface of the strip contains the first and / or second polymer material.
  • the containing the second polymer material layer of fiber material between a web material contact surface providing layer of fiber material and the Carrying structure is arranged.
  • a further embodiment of the invention provides that in at least one of the layers of fiber material, either only the first elastomeric polymer material or only the second elastomeric polymer material is arranged.
  • a further development of the invention further provides that a layer of fibrous material, which is arranged between the layer of fiber material providing the web material contact surface and the support structure, contains at least the first polymer material.
  • a layer of fiber material containing at least the first polymer material may in particular be one which is arranged between a layer of fiber material providing the web material contact surface and the support structure.
  • the support structure may be fabric-like or random. It is also conceivable in this connection that the carrying structure comprises or is formed from a one-piece polymeric lattice structure, as is the case for example in the US Pat EP0285376 is described. In general, any textile surface structure which is suitable as a load-bearing support structure is conceivable.
  • the at least one layer of fiber material is preferably formed as a nonwoven layer.
  • all of the layers of fiber material of the band are formed as nonwoven layers.
  • the strip according to the invention may comprise at least one layer of fiber material, in particular nonwoven layer, whose fibers are at least partially, in particular completely, built up from thermoplastic polyurethane are.
  • a structure is, for example, in the German patent application with the application number 10 2007 000 578.6 described. The disclosure of the application 10 2007 000 578.6 is hereby incorporated into the present application.
  • the strip may comprise at least one non-textile layer of, for example, a cast or formed membrane or lattice structure containing or consisting of one or more vulcanized thermoplastic elastomers.
  • a non-textile layer of, for example, a cast or formed membrane or lattice structure containing or consisting of one or more vulcanized thermoplastic elastomers.
  • a non-textile lattice structure which comprises thermoplastic polyurethane as matrix material with spherical glass material embedded therein, or is constructed from it.
  • a non-textile lattice structure is conceivable which comprises thermoplastic polyurethane as matrix material with spherical glass material embedded therein, or is constructed from it.
  • Such a structure is, for example, in the German patent application with the application number 10 2007 000 563.8 described. The disclosure of the application 10 2007 000 563.8 is hereby incorporated into the present application.
  • a structure is conceivable in which a substrate of a plurality of threads provided as a flat structure is coated with at least two layers of coating material, wherein at least two of the layers of the coating material have different properties.
  • at least one of the layers can be constructed from an elastomeric polymer material.
  • the tape may have a thickness of 4mm or less, preferably 3.5mm or less, more preferably 2.8mm or less. Due to the small thickness of the band, the nip geometry is only very slightly influenced by the press nip as the band passes through.
  • the object is achieved by a machine for producing and / or processing a fibrous web, in particular paper, board or tissue web with a press section in which the fibrous web is dewatered, wherein the press section comprises a maximum of two press nips and the Material web is dewatered in at least one of the two press nips by means of at least one fluid-permeable band containing elastomeric polymer material whose total weight in relation to the total weight of the band is more than 50%, preferably more than 60%.
  • the band comprises in particular a support structure and at least one layer of fiber material, wherein the elastomeric polymer material at least partially embeds fibers of one or more of the layers and / or the support structure.
  • the press section has only a single press nip, so that the entire dewatering is accomplished by only one press pulse.
  • the one single press nip can be formed in particular by a shoe press.
  • At least one, preferably both press jackets of the press nips have a groove extending in the machine direction.
  • a particularly preferred embodiment therefore provides that the machine operates at a web speed of 1600 m / min or more, preferably 1800 m / min or more, more preferably 2000 m / min.
  • Band 1 comprises several layers of fiber material formed as nonwoven layers 2-5 and a support structure 6 formed as a fabric.
  • the tape further comprises according to the invention an elastomeric polymer material, the total weight of which in the tape has a content of more than 50%, preferably more than 60% of the total weight of the tape.
  • the elastomeric polymer material comprises only a first and a second polymer material. Both the first and the second elastomeric polymer material is an elastomeric polyurethane.
  • the uppermost of the nonwoven layers 2 provides the web material contact surface 7 of the belt 1 and comprises fibers 11 having a denier in the range of about 3.3 to 6.7 dtex.
  • the fibers are in the present case formed from PA.
  • the second elastomeric polymer material is contained in the region of the web material contact surface 7, in which fibers of the nonwoven layer 2 are at least partially embedded.
  • the second elastomeric polymer material with fibers of the uppermost nonwoven layer 2 forms a permeable composite structure in that the second polymer material partially fills and / or bridges cavities formed between fibers of this layer 2.
  • the second elastomeric polymer material forms a one-piece and permeable polymer layer 8, which is arranged in the uppermost nonwoven layer 2.
  • the polymer layer 8 in this case has a thickness in the range of about 0.05 mm to about 1.5 mm, preferably about 0.05 mm to about 1.0 mm.
  • the second polymer material has a weight ratio of 1: 1 to the nonwoven layer 2.
  • the nonwoven layer 2 providing the web material contact surface 7 of the band 1 contains at least the second polymer material.
  • the upper middle nonwoven layer 3 comprises fibers 12 having a denier in the range of about 17dtex.
  • the fibers are in the present case formed from PA.
  • the first elastomeric polymer material is contained, in which fibers of the nonwoven layer 3 are completely embedded.
  • the first elastomeric polymer material in this case forms a film 9, which at least partially covers the fibers of the nonwoven layer 3.
  • the first polymer material has to Nonwoven layer 3 a weight ratio of 1: 2.
  • the lower middle nonwoven layer 4 comprises fibers 13 with a titer in the range of about 44dtex.
  • the fibers are in the present case formed from PA.
  • the first elastomeric polymer material is contained, in which fibers of the nonwoven layer 4 are completely embedded.
  • the first elastomeric polymer material in this case forms a film 9 which at least partially covers the fibers of the nonwoven layer 4.
  • the first polymer material has a weight ratio of 1: 2 to the nonwoven layer 4.
  • the nonwoven layers 3, 4 arranged between the nonwoven layer 2 providing the sheet material contact surface 7 and the support structure 6 contain at least the first polymer material.
  • the nonwoven layers 3, 4, which are arranged between the nonwoven layer 2 providing the web material contact surface 7 and the support structure 6, have a larger titer than the nonwoven layer 2 providing the web material contact surface 7.
  • the lowermost of the nonwoven layers 5 provides the machine contact surface 10 of the belt 1 and comprises fibers 15 having a denier in the range of about 44dtex.
  • the fibers are in the present case formed from PA.
  • the first elastomeric polymer material is contained, in which fibers of the nonwoven layer 5 are completely embedded.
  • the first elastomeric polymer material in this case forms a film 9 which at least partially covers the fibers of the nonwoven layer 5.
  • the first polymer material has a weight ratio of 1: 1.5 to the nonwoven layer 5.
  • the first polymer material extends over the entire thickness of the respective nonwoven layer, whereas the polymer layer 8 only extends over a part of the thickness of the uppermost nonwoven layer 2 extends.
  • the first elastomeric polymer material is included, which covers the threads 14 of the support structure 6 with a film 9 at least partially.
  • the nonwoven layers contain either only the first elastomeric polymer material or only the second elastomeric polymer material. Further, the proportion of the weight of the polymer material to the total weight of the band varies locally in the thickness direction of the band 1.
  • first and second polymeric materials themselves are impermeable to fluid.
  • the FIG. 2 shows a machine according to the invention for the production and / or processing of a fibrous web, in particular paper, board or tissue web with a press nip 20 comprising only a single press nip 16 in which a paper web 19 is dewatered.
  • the in the FIG. 2 The machine shown is designed to operate at a web speed of 1600m / min or more, preferably 1800m / min or more, more preferably 2000m / min.
  • the paper web 19 is sandwiched by the press nip 20 between two of the FIG. 1 known press felts 1, 1 'out and dewatered by this.
  • the press nip 20 is formed by a shoe press which has an upper conventional press roll 17 and a lower press roll 18 formed as a shoe press roll.
  • Each press cover 21, 22 of the two press rolls 17, 18 in this case has a groove extending in the machine direction (MD).

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  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Nonwoven Fabrics (AREA)
EP20080166851 2007-12-21 2008-10-17 Bande pour une machine destinée à la fabrication de matériau en bande Withdrawn EP2072675A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710055902 DE102007055902A1 (de) 2007-12-21 2007-12-21 Band für eine Maschine zur Herstellung von Bahnmaterial

Publications (2)

Publication Number Publication Date
EP2072675A2 true EP2072675A2 (fr) 2009-06-24
EP2072675A3 EP2072675A3 (fr) 2013-05-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080166851 Withdrawn EP2072675A3 (fr) 2007-12-21 2008-10-17 Bande pour une machine destinée à la fabrication de matériau en bande

Country Status (3)

Country Link
US (1) US8152964B2 (fr)
EP (1) EP2072675A3 (fr)
DE (1) DE102007055902A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011015386A1 (fr) 2009-08-04 2011-02-10 Voith Patent Gmbh Combinaison d'un feutre de presse avec un revêtement de cylindre compresseur et/ou un revêtement de cylindre aspirant pour une machine à papier
EP2678471B1 (fr) 2011-02-23 2018-03-14 Voith Patent GmbH Section de presse d'une machine à fabriquer une bande de matière fibreuse

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Publication number Priority date Publication date Assignee Title
DE102007055864A1 (de) 2007-12-19 2009-06-25 Voith Patent Gmbh Transportband und Verfahren zu seiner Herstellung
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
DE102008043917A1 (de) 2008-11-20 2010-05-27 Voith Patent Gmbh Pressfilz und Verfahren zu seiner Herstellung
US10358745B1 (en) * 2016-08-29 2019-07-23 Tintoria Piana U.S., Inc. Method of chemical treatment for loose fibers
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US8152964B2 (en) 2012-04-10
DE102007055902A1 (de) 2009-06-25
EP2072675A3 (fr) 2013-05-15
US20090199988A1 (en) 2009-08-13

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