EP1659217A1 - Bande porteuse pour machine à papier, en particulier feutre de presse - Google Patents

Bande porteuse pour machine à papier, en particulier feutre de presse Download PDF

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Publication number
EP1659217A1
EP1659217A1 EP20050109313 EP05109313A EP1659217A1 EP 1659217 A1 EP1659217 A1 EP 1659217A1 EP 20050109313 EP20050109313 EP 20050109313 EP 05109313 A EP05109313 A EP 05109313A EP 1659217 A1 EP1659217 A1 EP 1659217A1
Authority
EP
European Patent Office
Prior art keywords
fibers
paper machine
layer
paper
machine clothing
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Withdrawn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
EP20050109313
Other languages
German (de)
English (en)
Inventor
Dr. Georg Kleiser
Achim Lesmeister
Hubert Walkenhaus
Bob Crook
Hans Ragvald
Ralf Burbaum
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Voith Fabrics Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH, Voith Fabrics Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1659217A1 publication Critical patent/EP1659217A1/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Withdrawn legal-status Critical Current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
    • D21F7/086—Substantially impermeable for transferring fibrous webs
    • 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.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/682—Needled nonwoven fabric

Definitions

  • the invention relates to a paper machine clothing, in particular a press felt for the press section of a paper machine, according to the preamble of patent claim 1.
  • a conveyor belt for a paper machine which has on its paper-side surface a layer of at least two fibers with different surface properties.
  • This paper-side layer has hydrophilic and hydrophobic areas to improve the release properties of the tape from the paper web.
  • the additional surface with the at least two different fibers is ground smooth in a suitable manner, the fibers being partially exposed on the surface and giving them a certain, so-called micro-roughness.
  • Such a conveyor belt represents, for example, a papermachine clothing according to the preamble of patent claim 1.
  • such fabrics have on their paper-side surface fibers which form, for example, loops on the surface or lay flat on the surface.
  • Such loops or flat-lying fibers can impair the quality of the paper produced in the paper machine due to moldings in the paper, especially if these indentations or indentations later lead to missing points on the paper during printing of the paper, for example by gravure printing.
  • permeable drainage structures such as, for example, a dryer fabric, which preferably comes to the iron set in the press section of a paper machine, impressions on the paper surface should, however, be avoided.
  • a good separation of the screen from the paper web should be possible, especially in high-speed paper machines for graphic papers.
  • the invention has for its object to provide a papermachine fabric of the type mentioned, with which a high paper quality can be achieved and in which in particular impressions are prevented on the paper web.
  • Another object of the invention is to propose a paper machine clothing with improved paper removal properties.
  • the generic papermachine clothing which may in particular be a press felt, has a carrier layer on which at least sections of fibers with exposed fiber ends are arranged.
  • the fibers form a contact surface on which a paper web can be brought to rest.
  • the paper machine clothing according to the invention is characterized in that the contact surface is formed essentially by the exposed fiber ends.
  • the contact surface on a uniform and level level to the paper web and the dimensions of each contact point is kept as small as possible from the fabric to the paper web.
  • this results in a high number of support or support points on the paper-side surface of the fabric, which just because of their high number and each small surface does not press into the paper web.
  • fiber formations or indentations are usually the reason that printing dots are missing in the finished product, for example, a gravure printed graphic paper such as a newspaper page, due to the non-uniform texture of the paper web. Due to the high number of relatively small contact points thus results in a very uniform and uniform surface of the paper machine clothing, so for example a press felt, and thus an equally uniform surface of the paper web, which thus has a very high quality.
  • the ability to easily remove the paper web from the papermachine fabric, for example when transferring the paper web to another fabric significantly improved by a large number of relatively small contact points coming into contact with the paper web contact surface.
  • the carrier layer has a surface to which the fibers extend at an angle ( ⁇ ) between 45 and 90 °.
  • the fibers extend substantially perpendicular to the surface of the carrier layer.
  • a bonding layer is arranged on the surface of the carrier layer, in which the fibers are partially ei n-bedded.
  • the fibers are preferably embedded in the carrier layer by needling and the binding layer is arranged in a completely penetrating manner.
  • the binding system serves to anchor the fibers and can at the same time contribute to the paper machine clothing as a whole having the required permeability or, in general, the desired technical properties, such as, for example, the compression resistance, the durability, the chemical resistance or the void volume. This can be done by using additional materials or materials having a lower melting point than, for example, the carrier layer and / or the fibers. This can also be done by adding a liquid / suspension-type binding system.
  • the fiber ends are less than 1 mm, preferably less than 0.5 mm, particularly preferred less than 0.3 mm and more than 15 ⁇ m above the surface of the carrier layer or the bonding layer. It follows that the fiber ends ultimately slightly beyond the surface of the fabric to the outside, ie towards the paper web. As a result of the multiplicity of fiber ends, numerous contact points for the paper web on the clothing, ie, for example, for the press felt, ultimately result in a somewhat "hedgehog-like" surface of the paper machine clothing. In any case, the indentations of the cross section of each exposed fiber end are smaller than imprints of flat-lying fibers.
  • the fiber ends are less than ten times the fiber diameter, preferably less than five times, more preferably less than three times the fiber diameter over the surface of the carrier layer or the binder layer.
  • These relations may also be important for the reduction of web-side indentations.
  • the relation between the amount of protrusion of the fiber across the surface of the fabric relative to the fiber diameter and the planarity of the fibers in the prior art may be critical. According to the invention, this relationship is critically important for fiber diameter> 3 dtex. Fibers with a fineness ⁇ 3 dtex need not follow this relationship due to the fact that they can not induce web boarding which affects later printing on the paper.
  • the bonding layer is softer than the fiber material and preferably made of a thermoplastic elastomer educated. This ensures flexibility, which helps to reduce indentations on the paper. But it is also possible that the bonding layer is formed similarly hard or harder than the fiber material in dependence on the structure of the complete structure of the papermachine fabric.
  • a papermachine fabric 1 but in particular not exclusively a press film for the press section of a paper machine not shown in detail, is shown schematically in a perspective, partial view.
  • the x-axis shown in FIG. 1 extends in the longitudinal direction of the papermachine fabric 1, hereinafter also referred to briefly as covering, the y-axis extends in the transverse direction of the fabric and the z-axis extends in the direction of the height or the thickness of the fabric ,
  • the x-axis therefore corresponds to the machine direction, also called machine direction, the y-axis corresponds to the cross machine direction.
  • the paper machine clothing 1 may also be a so-called smoothing belt or an impermeable conveyor belt, for example with the desired release properties of the paper web not shown in detail.
  • the paper machine clothing 1 has a carrier layer 2, in which fibers 3, for example. Needled are embedded. Also for anchoring the fibers 3, a bonding layer 6 is provided, in which the fibers are partially embedded.
  • the Fibers 3 with their exposed fiber ends 5 form a contact surface 7 for a paper web, not shown.
  • the contact surface 7 is formed by the exposed fiber ends 5 of the fibers 3.
  • the present embodiment shows that the fibers extend substantially perpendicular to the surface 4 of the carrier layer 2 or to the covering 1.
  • the paper machine clothing 1 can, as indicated above, have a permeable drainage structure and therefore represent in particular a press felt.
  • the backing layer 2 may be, for example, a so-called woven or nonwoven base substrate having the required mechanical properties, such as sufficient tensile strength in the machine direction and transversely thereto (see x, y axes in FIG. 1).
  • the fibers 3 may have a uniform or a different diameter and a uniform or a different shape, the same or different chemical, thermal and mechanical properties.
  • FIG. 1 For the sake of clarity, only a few fibers are shown in FIG. 1. It is clear that the papermachine fabric 1 in practice has numerous fibers and also numerous substantially vertically projecting fiber ends 5. This is illustrated in a perspective, schematic, partial view of the papermachine fabric 1 in FIG. 2, which ultimately results in a densely packed, somewhat "hedgehog-like" surface structure of the fabric.
  • the fiber ends 5 are usually less than 1 mm, preferably less than 0.5 mm, more preferably less than 0.3 mm and more than 15 microns over the surface 4 of the carrier layer 2 or the bonding layer 6 before. It has also proven useful that the fiber ends 5 project less than ten times the fiber diameter, preferably less than five times, more preferably less than three times the fiber diameter over the surface 4 of the carrier layer 2 or the binding layer 6.
  • the dense juxtaposition of the individual fiber ends is also apparent from the fact that in a preferred embodiment of the invention for fibers with a fineness of about 3.3 dtex 250,000 to 325,000 fibers per cm 2 and fibers with a fineness of about 6.7 dtex 125,000 to 200,000 per cm 2 of the carrier layer or the binding layer are arranged.
  • the aforementioned bonding layer 6 is usually softer than the fibrous material and preferably formed from a thermoplastic elastomer.
  • the portions of the fibers exposed above the desired stick-out height may be removed from the surface of the clothing by mechanical, thermal or chemical methods.
  • One possible mechanical method is, for example, the grinding or cutting off of the protruding fiber ends 5.
  • the release properties of the relevant papermachine fabric from the paper web not shown in more detail can be adjusted by modifying the fiber diameter and by mixing different fiber diameters.
  • the fibers are treated so that they are not electrically conductive. Then the ends are statically charged, so that they are approximately vertical. This process could also be done during the application of the tie layer.
  • the carrier layer may comprise a so-called bonding layer. But it is also possible that the fabric has only a carrier layer.
  • papermachine clothing should also be understood to mean a clothing production of tissue paper, cardboard or pulp.

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  • Paper (AREA)
EP20050109313 2004-11-22 2005-10-07 Bande porteuse pour machine à papier, en particulier feutre de presse Withdrawn EP1659217A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200410056319 DE102004056319A1 (de) 2004-11-22 2004-11-22 Papiermaschinenbespannung

Publications (1)

Publication Number Publication Date
EP1659217A1 true EP1659217A1 (fr) 2006-05-24

Family

ID=35385413

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050109313 Withdrawn EP1659217A1 (fr) 2004-11-22 2005-10-07 Bande porteuse pour machine à papier, en particulier feutre de presse

Country Status (3)

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US (1) US20060180292A1 (fr)
EP (1) EP1659217A1 (fr)
DE (1) DE102004056319A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009034383B4 (de) * 2009-07-23 2014-02-13 Siemens Aktiengesellschaft Pressfilz und dessen Verwendung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2271295A (en) * 1939-01-10 1942-01-27 Drycor Felt Company Belting for use as paper felt, industrial felt, pulp felt, drier felt, and the like
FR2088877A5 (en) * 1970-04-28 1972-01-07 Cofpa Woven endless paper web dehydrating screen with flocculated surface
EP0151705A2 (fr) * 1984-02-09 1985-08-21 J.J. Marx GmbH Bande à chaînons pour machines à papier
US4746546A (en) * 1985-03-26 1988-05-24 Asten Group, Inc. Method of forming endless wire belt for paper machines or the like
DE29706427U1 (de) * 1997-04-10 1997-06-05 Huyck-Austria Ges.M.B.H., Gloggnitz Biegsames Band, insbesondere zum Einsatz in Papiermaschinen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US630573A (en) * 1899-01-24 1899-08-08 Robert R Smith Fabric.
JPS6177324A (ja) * 1984-09-21 1986-04-19 Toshiba Corp 金属薄膜の形成方法
EP0195835B1 (fr) * 1985-03-26 1991-02-27 Asten Group, Inc. Bande de tamisage sans fin pour machines à papier ou similaires

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2271295A (en) * 1939-01-10 1942-01-27 Drycor Felt Company Belting for use as paper felt, industrial felt, pulp felt, drier felt, and the like
FR2088877A5 (en) * 1970-04-28 1972-01-07 Cofpa Woven endless paper web dehydrating screen with flocculated surface
EP0151705A2 (fr) * 1984-02-09 1985-08-21 J.J. Marx GmbH Bande à chaînons pour machines à papier
US4746546A (en) * 1985-03-26 1988-05-24 Asten Group, Inc. Method of forming endless wire belt for paper machines or the like
DE29706427U1 (de) * 1997-04-10 1997-06-05 Huyck-Austria Ges.M.B.H., Gloggnitz Biegsames Band, insbesondere zum Einsatz in Papiermaschinen

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Publication number Publication date
DE102004056319A1 (de) 2006-05-24
US20060180292A1 (en) 2006-08-17

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