EP1305472A1 - Bande sans fin - Google Patents

Bande sans fin

Info

Publication number
EP1305472A1
EP1305472A1 EP01980227A EP01980227A EP1305472A1 EP 1305472 A1 EP1305472 A1 EP 1305472A1 EP 01980227 A EP01980227 A EP 01980227A EP 01980227 A EP01980227 A EP 01980227A EP 1305472 A1 EP1305472 A1 EP 1305472A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
endless belt
adhesive areas
adhesive
press felt
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Withdrawn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
EP01980227A
Other languages
German (de)
English (en)
Inventor
Thomas Augscheller
Ulrich Begemann
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 Paper 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
Priority claimed from DE10037367A external-priority patent/DE10037367A1/de
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1305472A1 publication Critical patent/EP1305472A1/fr
Withdrawn legal-status Critical Current

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
    • D21F7/006—Cutting the edges of the paper-web
    • 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

Definitions

  • the invention relates generally to an endless belt, in particular felt or screen, for a machine for producing and / or finishing a paper, cardboard, tissue or other fibrous web.
  • It relates, inter alia, to a compressible, water-absorbing and endless press felt for use in press sections for dewatering paper, cardboard, tissue or other fibrous webs, and to a method for producing the same, and also to a forming wire of a former for forming a machine for producing a paper , Cardboard, tissue or other fibrous web, which transfers the fibrous web to a subsequent machine unit and continues the edge strips of the fibrous web separated before the transfer of the fibrous web also after the transfer of the fibrous web, and finally a dryer fabric of a dryer section of a machine for the manufacture and / / or finishing a paper, cardboard, tissue or other fibrous web which guides the fibrous web and partially wraps around at least one heated rotating drying cylinder, the fibrous web coming into contact with the drying cylinder.
  • the fiber web is dewatered and formed in the former, and is guided by at least one forming wire.
  • the forming wire is permeable to air and water and usually passes the fibrous web to a press felt of a subsequent press section for further dewatering of the fibrous web.
  • the fibrous web formed in the former is generally wider than necessary, since only the homogeneously formed middle part of the fibrous web is treated further in the following machine unit. Therefore, before the transfer of the fibrous web, the edge strips are cut off using a water jet.
  • the fibrous web To dry the fibrous web, it is guided in drying groups in the dryer section, generally supported by a dryer fabric, over guide rollers and heated drying cylinders.
  • the fibrous web comes into contact with the smooth surface of the drying cylinders. Because of the resulting adhesion of the fibrous web to the drying cylinder, the fibrous web tends to run with the drying cylinder when the drying wire is removed. This is particularly problematic when the fibrous web has a high moisture content, ie at the beginning of the dryer section.
  • the dryer groups are designed to be very short at the beginning of the dryer section and trains, i.e. differential speeds, are built up between the dryer groups. This is not only complex, but also strains the fibrous web.
  • An object of the invention is therefore to improve the guidance of the fibrous web on the press felt with simple means. Another object of the invention is to ensure that the edge strips adhere to the forming wire even after the middle part has been transferred, even at high machine speeds. Finally, the invention has for its object to counteract the adhesion of the fibrous web to the drying cylinder with the simplest possible means.
  • the endless belt in question has increased adhesion in adhesive regions which run opposite the edge regions of the fibrous web.
  • the object arising with respect to the press felt was therefore achieved in that the press felt has increased adhesion in adhesive areas which run opposite the edge areas of the fibrous web. This leads to improved adhesion of the edge areas and thus also the entire fibrous web to the press felt.
  • the adhesive areas can cause qualitative differences in the edge areas of the fibrous web, this is irrelevant since the edge areas are generally separated in the subsequent machine units anyway. To achieve good adhesion, it is also sufficient from the aspect of minimizing the bleed if the adhesive areas of the press felt each cover an edge area of the fibrous web with a width of between 2 and 25 cm.
  • the press felt can have increased air permeability in adhesive areas which run opposite the edge areas of the fibrous web.
  • the reduced flow resistance improves the effectiveness of suction devices on the edge regions of the fibrous web, the suction devices being arranged, for example in the form of suction boxes or suction rolls, on the side of the press felt opposite the fibrous web.
  • the press felt can be designed like a sieve in the adhesive areas and / or have larger pores.
  • One way to increase the adhesion of the press felt is to coat or soak the press felt in the adhesive area at least on the side in contact with the fibrous web with a polymer, preferably polyurethane or polyamide.
  • a polymer preferably polyurethane or polyamide.
  • the adhesive area is treated with a liquid polymer and, after it has cured, aftertreated, in particular ground and / or embossed.
  • the press felt in the adhesive area has at least on the surface touching the fibrous web of fine nonwoven fibers than between the adhesive areas, the diameter of which is preferably less than 27 micrometers and / or has chemically treated nonwoven fibers.
  • the press felt in Adhesion area at least on the surface contacting the fibrous web, has a larger number of nonwoven fibers than on the surface between the adhesion areas.
  • the thickness of the press felt in the adhesive area in the loaded state should deviate from the thickness between the adhesive areas by a maximum of 1 mm, preferably a maximum of 0.5 mm. This limits the impact on the quality of the fibrous web, especially the edge areas.
  • the problem arising with respect to the forming wire is achieved accordingly in that the forming wire has increased adhesion in adhesive areas which run opposite the edge areas of the fibrous web. This leads to an improved adhesion of the edge strips to the forming wire, so that there is little scrapping.
  • the forming wire has a lower air permeability in the adhesive areas than in the main area in between.
  • the forming wire should even be air-impermeable in the adhesive areas. This makes rear ventilation more difficult and thus detachment of the edge strips.
  • the forming wire should be filled with a polymer, preferably polyurethane, in the adhesive areas. Adhesion can also be increased in that the forming wire has a smooth surface in the adhesive areas on the side facing the fibrous web.
  • the adhesive areas do not have to cover the entire width of the edge strips.
  • At least one scraper and / or water and / or air nozzle should be assigned to the adhesive areas after the transfer of the fibrous web to remove the edge strips from the adhesive areas.
  • the former is formed by two forming screens, usually arranged one above the other, between which the fibrous web runs, only one, preferably the forming screen, which transfers the fibrous web to the next machine unit, should have adhesive areas. This is generally the lower forming wire.
  • the problem arising with respect to the dryer fabric is achieved in that the dryer fabric has increased adhesion in adhesive areas which run opposite the edge areas of the fibrous web.
  • the knowledge was taken into account that in particular the edge areas of the fibrous web adhere more strongly to the drying cylinder. It is therefore sufficient to arrange adhesive areas opposite the edges of the fibrous web.
  • the adhesive areas of the dryer fabric should each cover an edge area of the fibrous web with a width of 30 to 100 mm.
  • the dry sieve has a smooth surface in the adhesive areas on the side facing the fibrous web. On its own or in combination with the smooth surface, it is also possible for the dry sieve to have less air permeability in the adhesive areas than in the main area in between.
  • the adhesive areas should preferably even be air-impermeable.
  • This design of the adhesive areas is made possible in particular by filling the dryer fabric in the adhesive areas with a polymer, preferably polyurethane.
  • Dryer screens designed in this way should be used in particular in dryer groups in the dryer section in which only one side of the fibrous web comes into contact with heated drying cylinders. This is essentially due to the fact that in these dryer groups the fibrous web does not have to be transferred between dryer fabrics.
  • the invention should be explained in more detail below on the basis of various exemplary embodiments with reference to the drawing; in this show:
  • Fig. 3 shows a cross section through a forming wire with fibrous web
  • Fig. 4 shows a cross section through the edge of a dryer fabric.
  • FIG. 1 in which a cross section through the edge of a press felt 2 is shown.
  • a press felt 2 is used in addition to a suction of the leading press felt 2 or above all on its own, which has increased adhesion in adhesive areas 3, which run in relation to the edge areas 4 of the fibrous web 1. Since this is usually associated with a changed surface structure in the adhesive area 3 of the press felt 2, impairments in the quality of the fibrous web 1 in the edge area 4 cannot be ruled out. However, for good adhesion of the fibrous web 1 to the press felt 2, it is sufficient if the adhesive regions 3 of the press felt 2 each cover an edge region 4 of the fibrous web 1 with a width of approximately 10 to 15 cm. Since these edge areas 4 are cut off anyway in subsequent units of the paper machine, at the latest when winding up, this impairment of the quality has no consequences.
  • the surface of the press felt 2 which comes into contact with the fibrous web 1 is coated in the adhesive region 3, which here extends to the end of the press felt 2, with polyurethane.
  • the polyurethane also penetrates into the press felt 2.
  • the coating with the polymer 5 can cause the press felts
  • the adhesion in the adhesive area 3 can also be improved in that the press felt 2 in the adhesive area
  • the fibrous web 1 touching surface has finer nonwoven fibers than between the adhesive areas 3, the diameter of which is preferably less than 27 ⁇ m and / or has chemically treated nonwoven fibers and / or the press felt 2 in the adhesive area 3 at least on the fibrous web 1 touching surface has a greater number of nonwoven fibers than on the surface between the adhesive areas 3. This also leads to a changed surface structure in the adhesive areas 3 of the press felt 2.
  • FIGS. 2 and 3 a schematic cross section through an end region of a former or a partial step through a former screen 13 with a fibrous web 11 is shown.
  • the former of a paper machine for dewatering and forming the fibrous web 11, that is to say specifically the paper web here, is formed by two superimposed, continuously rotating forming screens 13, 18, between which the fibrous web 11 lies.
  • the forming wires 13, 18 guided over guide rollers 21 are separated from one another at the end of the forming device, the fibrous web 11 running with the lower forming wire 13.
  • edge strips 12 are then separated from the homogeneous part of the fibrous web 11 by means of water jet nozzles 22.
  • the fibrous web 11 is then taken over by a press felt 19 of the following press section which wraps around a suction guide roller 20 for further dewatering.
  • the lower former 13 has adhesive areas 14 with increased adhesion compared to the edge strips 12.
  • the adhesive areas 14 of the forming wire 13 are filled with polyurethane. While the main area 15 of the forming wire 13 is air-permeable for dewatering the fibrous web 11, the adhesive areas 14 are air-impermeable. In addition, the surface of the adhesive areas 14 facing the edge strips 12 is smooth. Both measures result in the edge strips 12 adhering securely to the forming wire 13 even after the fibrous web 11 has been released.
  • FIG. 4 in which a cross section through the edge of a dryer fabric 22 is shown.
  • the fibrous web 21 runs for drying in the single-tier dryer group of a dryer section from the dryer fabric 22, alternately over guide rollers and heated, rotating dryer cylinders 23, whereby it comes into contact with the dryer cylinders 23.
  • the drying wire 2 In order to be able to guide the fibrous web 21 relatively easily and safely away from the drying cylinder 23 after the partial wrapping, the drying wire 2 has an increased adhesion in adhesive areas 24 which run opposite the edge areas of the fibrous web 21.
  • the dryer fabric 22 is filled with polyurethane in the adhesive areas 24.
  • the adhesive areas 24 are not only airtight, but also smooth in relation to the fibrous web 21.
  • the edge regions of the fibrous web 21 tend to adhere to the smooth drying cylinder 23, it is sufficient if the adhesive regions 24 each cover an edge region of the fibrous web 21 with a width between 30 and 100 mm. LIST OF REFERENCE NUMBERS

Landscapes

  • Paper (AREA)

Abstract

Bande sans fin, en particulier, feutre ou toile, destinée à une machine de fabrication et/ou d'ennoblissement d'une bande continue de papier, carton, tissu ou autre matière fibreuse (1, 11, 21) présentant un pouvoir adhésif accru dans les zones d'adhérence (3, 14, 24) s'étendant vis-à-vis des zones marginales (4, 12) de la bande continue de matière fibreuse (1, 11, 21).
EP01980227A 2000-07-31 2001-07-31 Bande sans fin Withdrawn EP1305472A1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE10037367A DE10037367A1 (de) 2000-07-31 2000-07-31 Pressfilz
DE10037367 2000-07-31
DE20107846U 2001-05-09
DE20107844U DE20107844U1 (de) 2000-07-31 2001-05-09 Trockensieb
DE20107846U DE20107846U1 (de) 2000-07-31 2001-05-09 Formersieb
DE20107844U 2001-05-09
PCT/EP2001/008866 WO2002010510A1 (fr) 2000-07-31 2001-07-31 Bande sans fin

Publications (1)

Publication Number Publication Date
EP1305472A1 true EP1305472A1 (fr) 2003-05-02

Family

ID=27213981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01980227A Withdrawn EP1305472A1 (fr) 2000-07-31 2001-07-31 Bande sans fin

Country Status (2)

Country Link
EP (1) EP1305472A1 (fr)
WO (1) WO2002010510A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI110133B (fi) * 2000-12-18 2002-11-29 Tamfelt Oyj Abp Menetelmä puristinhuovan valmistamiseksi ja puristinhuopa
FI20020804A0 (fi) 2002-04-26 2002-04-26 Tamfelt Oyj Abp Järjestely paperikoneen puristinosalla

Family Cites Families (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
US3652390A (en) * 1970-02-10 1972-03-28 Kimberly Clark Co Papermaking drainage fabric and stock inlet combination for producing even edged paper web
US4784190A (en) * 1980-10-16 1988-11-15 Huyck Corporation Dryer fabric having longitudinal zones of different permeability
US5397438A (en) * 1990-07-06 1995-03-14 Valmet Paper Machinery, Inc. Method and device for reduction and equalization of transverse shrinkage of paper in single-wire draw in a drying section
SE504975C2 (sv) * 1995-09-08 1997-06-02 Albany Int Corp Torkvira

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0210510A1 *

Also Published As

Publication number Publication date
WO2002010510A1 (fr) 2002-02-07

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 20040807