WO2013182629A1 - Procédé de production d'une bande de feutre perméable sans fin - Google Patents

Procédé de production d'une bande de feutre perméable sans fin Download PDF

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Publication number
WO2013182629A1
WO2013182629A1 PCT/EP2013/061661 EP2013061661W WO2013182629A1 WO 2013182629 A1 WO2013182629 A1 WO 2013182629A1 EP 2013061661 W EP2013061661 W EP 2013061661W WO 2013182629 A1 WO2013182629 A1 WO 2013182629A1
Authority
WO
WIPO (PCT)
Prior art keywords
nonwoven layer
carrier substrate
nonwoven
felt belt
welded
Prior art date
Application number
PCT/EP2013/061661
Other languages
German (de)
English (en)
Inventor
Robert Eberhardt
Michael Straub
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 WO2013182629A1 publication Critical patent/WO2013182629A1/fr

Links

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
    • D21F7/10—Seams thereof

Definitions

  • the two ends of the felt belt are connected with a pintle.
  • the area of the plug wire seam differs from the rest of the carrier substrate and has less anchoring possibilities for needled nonwoven layers. This often manifests itself in a lower durability of the felt in the seam area.
  • melt fiber webs have been introduced over the plug wire seam, which melt during heat setting of the felt and bond the nonwoven fibers in the seam area.
  • other materials than those from which the usual non-woven fibers are used. A connection of the melt fiber web to the remaining nonwoven fibers is given, but this connection is relatively weak.
  • the invention has for its object to provide a method by which an endless permeable felt belt of better quality, especially in the seam area can be produced and which is intended for use as a covering within a paper machine.
  • the invention is also based on the object of specifying a correspondingly produced endless belt.
  • the formed plug wire seam of the carrier substrate of the felt belt is covered with at least one nonwoven layer, the nonwoven layer being applied in a region designated as a welding region by means of laser transmission welding.
  • felts can thus be produced which, for the first time, have a permeability that is comparable to the rest of the structure of the felt and, as a result, later do not form any markings in the seam area.
  • polyamide nonwovens can be welded onto the base substrate or the carrier substrate in the seam area.
  • felts with uniform materials, preferably polyamide 6 (PA6) and / or polyamide 6.6 (PA6.6), i. consist so-called staple fiber fleece.
  • PA6 polyamide 6
  • PA6.6 polyamide 6.6
  • staple fiber fleece i. consist so-called staple fiber fleece.
  • other nonwoven materials are also conceivable.
  • the fiber adhesion of further needled nonwoven layers can thus be increased.
  • a fusion and thus excellent bonding of the fibers takes place with one another.
  • the at least one nonwoven layer is applied to the side of the carrier substrate which faces the paper web inside the paper machine.
  • the at least one nonwoven layer is also applied to the side of the carrier substrate, which is opposite to the paper web within the paper machine. This means that at least one nonwoven layer is present on both sides of the basic structure.
  • the said nonwoven layer may be made from only one nonwoven strip or from only one needled nonwoven layer or a combination of nonwoven strips and patted nonwoven layer.
  • the method according to the invention makes it possible to firmly bond a nonwoven layer to the carrier substrate in the seam area, and the nonwoven fibers can even be welded onto the loop loops, which as a rule consist of monofilaments.
  • This also makes possible an excellent bonding of further nonwoven layers in the further felt structure and allows a reproducible felt production with stable permanent seam areas of substantially comparable structure (i.e., the seam area to the remaining felt).
  • One possibility for welding nonwoven layers to the carrier substrate by means of transmission welding is to coat the carrier substrate in the region to be welded at least superficially with a laser absorber.
  • the thread-containing carrier substrate is coated by a transfer printing roll. Preference is given to coating superficial, fabric heels having heels.
  • the carrier substrate threads may be made absorber-containing at least in the region to be welded.
  • the pintle for the pigtail seam is preferably not designed laser-absorbing. After needling or placing the at least one nonwoven layer to be welded (nonwoven layers and / or nonwoven strips), they are welded onto the carrier substrate by passing over them by means of a preferably provided NIR laser in the wavelength range between 800-1200 nm.
  • a diode laser with a wavelength of 940 nm can be used.
  • line lasers with a roll optics are particularly suitable for this purpose.
  • Such a laser produces a laser line which is passed through a transparent pressure roller and is focused below the pressure roller. It is thus possible to combine pressure and laser energy in one line.
  • the seam region to be welded can be run over with this laser arrangement and leads to a welding of the nonwoven layer and carrier substrate.
  • a particular advantage of the method according to the invention is that the absorber-containing yarns are only superficially heated by the laser transmission welding process and thus largely retain their mechanical properties.
  • Such a felt tape is produced by applying further nonwoven layers and / or other textile fabrics, for example polyurethane nonwoven (MeltSlow) or polyamide nonwoven fabric, etc. If desired, coatings can subsequently be applied.
  • the invention will be explained in more detail with reference to an embodiment.
  • FIGS. 1 to 4 show seam regions produced according to the invention for the continuous production of a felt belt.
  • FIG. 1 shows a partial area of a felt belt 1, which consists of a carrier substrate 2. To make it endless, it is hingedly connected at its two ends 3 and 4 with a pintle 5, so that now a pigtail 6 is formed.
  • This formed wire 6 is, in order to avoid in particular dewatering marks to cover with at least one nonwoven layer 7 or even needled.
  • the nonwoven layer 7 is applied in a region designated as the welding region 8 by means of a laser transmission welding process or connected to the carrier substrate. It can be seen in FIG. 1 that the nonwoven layer 7 in the form of a nonwoven strip 7a is applied to the upper side 2a of the carrier substrate 2. This is the side which later faces the paper, board or other fibrous web W to be produced inside the paper machine. By applying the nonwoven strip 7a, a permeability difference caused by the seam structure in the carrier substrate 2 is compensated.
  • a first nonwoven layer 7b is applied to the upper side 2a of the carrier substrate 2 before or after the needling. This is shown in FIG. It is also possible to apply the first nonwoven layer 7b additionally on the underside 2b of the carrier substrate, as shown in FIG.
  • the underside 2b is that side of the carrier substrate 2 which later faces the fibrous web W inside the paper machine.
  • FIG. 4 shows a further variant in which a combination of nonwoven strips 7a and nonwoven layer 7b is produced. It can be seen in FIG. 4 that directly above the plug-in wire seam 6, that is to say on the upper side 2 a of the carrier substrate 2, the nonwoven strip 7 a is located and above it the nonwoven layer 7 b is welded around the seam 6 in a wider area 8 a. The area 8a adjoins the welding area 8, in which the nonwoven strip is welded.
  • the nonwoven layer 7a and the nonwoven layer 7b are made of a polymeric material, i. Polyamide 6 (PA 6) or polyamide 6.6 (PA 6.6).
  • the carrier substrate is at least superficially coated in the region 8 to be welded with a laser absorber, not shown, and in this case the fabric rollings lying superficially on the carrier substrate 2 are coated via a transfer printing roll likewise not shown.
  • the threads of the carrier substrate 2 are designed to be absorber-containing at least in the region 8 to be welded.
  • the plug wire 5 for the plug wire seam 6 is preferably not carried out laser absorbing.
  • the at least one nonwoven layer 7 or the nonwoven layers 7b and / or nonwoven strips 7a to be welded they are welded onto the carrier substrate 2 by passing over them by means of an NIR laser in the wavelength range between 800-1200 nm.
  • an NIR laser in the wavelength range between 800-1200 nm.
  • a line laser with a roll optics as offered by the company Leister / Switzerland. This laser generates a laser line which is passed through a transparent pressure roller and is focused below the pressure roller. It is thus possible to combine pressure and laser energy in one line.
  • the welding region 8, ie the region in which the nonwoven layer is welded onto the carrier substrate 2, is run over by the laser arrangement.

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  • Paper (AREA)

Abstract

L'invention concerne un procédé de production d'une bande de feutre (1) perméable sans fin conçue pour être utilisée comme habillage à l'intérieur d'une machine à papier. Selon ledit procédé, les deux extrémités (3, 4) de la bande de feutre (1) présentant un substrat support (2) sont reliées entre elles à la manière d'une charnière par un fil à crochets (5) et forment ainsi une couture à fil à crochets (6). Selon l'invention, la couture à fil à crochets (6) formée du substrat support (2) de la bande de feutre (1) est recouverte par au moins une couche de non-tissé (7), ladite couche de non-tissé étant appliquée par soudage par transmission laser dans une zone qualifiée de zone de soudage (8).
PCT/EP2013/061661 2012-06-06 2013-06-06 Procédé de production d'une bande de feutre perméable sans fin WO2013182629A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012209526 2012-06-06
DE102012209526.8 2012-06-06

Publications (1)

Publication Number Publication Date
WO2013182629A1 true WO2013182629A1 (fr) 2013-12-12

Family

ID=48577048

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/061661 WO2013182629A1 (fr) 2012-06-06 2013-06-06 Procédé de production d'une bande de feutre perméable sans fin

Country Status (1)

Country Link
WO (1) WO2013182629A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755260A (en) * 1985-09-13 1988-07-05 Ichikawa Woolen Textile Co., Ltd. Method for producing felt for paper making
WO2011127594A1 (fr) * 2010-04-16 2011-10-20 Astenjohnson, Inc. Élément de couture filamentaire pour un tissu industriel et tissu industriel cousu en utilisant l'élément
WO2012055690A1 (fr) * 2010-10-27 2012-05-03 Voith Patent Gmbh Toile sans fin étirée

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755260A (en) * 1985-09-13 1988-07-05 Ichikawa Woolen Textile Co., Ltd. Method for producing felt for paper making
WO2011127594A1 (fr) * 2010-04-16 2011-10-20 Astenjohnson, Inc. Élément de couture filamentaire pour un tissu industriel et tissu industriel cousu en utilisant l'élément
WO2012055690A1 (fr) * 2010-10-27 2012-05-03 Voith Patent Gmbh Toile sans fin étirée

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