EP1637647A1 - Procédé de fabrication d'une habillage de machines à papier - Google Patents

Procédé de fabrication d'une habillage de machines à papier Download PDF

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Publication number
EP1637647A1
EP1637647A1 EP05106918A EP05106918A EP1637647A1 EP 1637647 A1 EP1637647 A1 EP 1637647A1 EP 05106918 A EP05106918 A EP 05106918A EP 05106918 A EP05106918 A EP 05106918A EP 1637647 A1 EP1637647 A1 EP 1637647A1
Authority
EP
European Patent Office
Prior art keywords
polymer material
basic structure
deposited
polymer
melted
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Withdrawn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
EP05106918A
Other languages
German (de)
English (en)
Inventor
Ian Sayers
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 EP1637647A1 publication Critical patent/EP1637647A1/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Withdrawn legal-status Critical Current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
    • 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

Definitions

  • This invention relates to the production of clothing such as forming fabrics, press felts, dryer fabrics and other industrial fabrics, such as transfer tapes, for a machine for producing and / or further processing fibrous webs, in particular paper, board, pulp or tissue.
  • Paper is usually produced by introducing a paper fiber suspension onto a forming fabric or between two forming fabrics in the forming section and subsequently dewatering it successively. Subsequently, the thus formed fibrous web is passed with a dry content of about 1% for further dewatering by means of press felts through the press section and then by means of dryer fabrics through the dryer section of the paper machine. In the case of tissue paper machines, the paper web is, for example, transferred from the press felt to a Yankee drying cylinder and then creped.
  • EP 0 367 739 describes applying to the surface of a press felt a thin layer of polymer foam.
  • a method for producing a papermachine fabric with a basic structure in which polymer material is deposited on the basic structure is proposed, which is characterized in that powdered and electrically charged polymer material are uniformly deposited on a free surface of the basic structure by means of electrical attraction and the polymer material is subsequently thermally and / or chemically activated, so that the polymer material bonds firmly to the basic structure.
  • the charged powdered polymer material is attracted to the free surface of the base structure, wherein the attraction at those areas of the surface on which no polymer material is deposited is greater than in those areas on which polymer material is already deposited. This leads to the uniform deposition of the polymer material on the entire surface.
  • the need to deposit the polymer particles by means of a carrier medium such as, for example, in a suspension is unnecessary by the deposition by means of electrical attraction. As a result, the cost of production are significantly reduced.
  • the deposition of the powdered polymeric material may be affected by the magnitude of the electrical charge, i. Depending on its charge, the polymer material is attracted to the basic structure to a different extent and thus also deposited.
  • the polymer material is not agglomerated, so that each polymer particle is substantially the same size and this is assigned the same charge.
  • the polymer material to be deposited is treated in such a way that it forms a cloud of non-agglomerated polymer powder.
  • a corresponding possibility of such a treatment may be to fluidize the powdery polymer material and at the same time to charge it electrically with ionized air.
  • the charged polymer particles contribute to the electric field between the polymer particles and the surface of the basic structure. The process is described in US 5,094,883.
  • the charged and powdered polymer material is deposited when all of the surface exposed to the polymer material is at the same electrical potential. This creates an equipotential surface on which it is particularly easy to control the polymer material in a controlled and uniform manner deposit.
  • the type of deposition and / or the type of thermal and / or chemical activation may influence whether or not the polymer material completely or partially covers the surface of the basic structure, whether the polymer material penetrates into the basic structure or not. Accordingly, preferred embodiments of the invention provide for the polymer material to be deposited and / or activated such that it covers the base structure closed. Furthermore, the polymer material is deposited and / or activated so that it does not cover the basic structure closed.
  • the invention provides that by selecting the deposition and / or activation parameters, the particle size distribution of the powdery polymer material can be influenced.
  • the method according to the invention finds use for depositing powdery polymer material on a base structure which is a nonwoven layer with fibers.
  • the polymeric material is preferably deposited and / or activated to provide a layer containing fibers and a polymer-fiber matrix.
  • a layer is particularly suitable as a paper side of a press felt having a smooth surface with high water absorption capacity with high wear resistance.
  • the polymer material is deposited and / or activated in such a way that the permeability is almost not lowered by the polymer-fiber matrix. This is accomplished primarily by depositing the powdered and electrically charged polymeric material such that it attaches substantially only along the fibers.
  • polymer material is used in the process according to the invention which is thermoplastic and / or thermosetting.
  • the thermoplastic polymer material may be one containing polyester and / or polyester urethane and / or polyurethane.
  • the polymer material can be applied in such a way that successively several layers of polymer material are applied.
  • the polymer material is deposited and / or activated in such a way that the polymer material of each layer and / or different layers different particle sizes and / or different melting points and / or different degrees of hardness.
  • polymer material having a particle size between 0.1 and 600 microns, preferably with a particle size between 1 and 300 microns, more preferably in the range between 20 and 150 microns use.
  • the thermal activation is preferably effected by radiation.
  • the chemical activation is preferably effected by reactants.
  • the polymer material melts and / or chemically reacts by the thermal and / or chemical activation and / or undergoes a phase transformation.
  • a covering is to be protected, which was produced by the method according to the invention.
  • FIG. 1 shows an apparatus 1 for carrying out the method according to the invention for producing a papermachine clothing 2.
  • the paper machine clothing 2 has a basic structure 3 with a free surface 4, on which powdered polymer material 5 is to be deposited.
  • the apparatus 1 has a separation chamber 6, an activation space 9 and two rollers 7 and 8 for transporting the paper machine clothing 2 of endless design (shown interrupted in FIG. 1).
  • the powdery polymer material 5 is first deposited in the separation chamber 6 on the surface 4 of the basic structure 3 of the paper machine clothing 2, before it thermally in the subsequently formed as a heating space activation space 9 is activated and merged in the present case with the basic structure 2.
  • the separation chamber 6 has an air inlet opening 11, through which air 12 is introduced into the separation chamber 6.
  • the introduced air 12 is passed through an air-permeable electrode 13, which is held at a high electrical potential by means of a high-voltage device 14 (for example 0-90 kV).
  • the introduced air 12 is ionized when passing through the electrode 13.
  • the ionized air 16 is passed through an air-permeable plate 15 with high flow resistance in a container in which the powdered polymer material 5 is located.
  • the air-permeable plate 15 can optionally be moved by a mechanism, for example. Shaken.
  • the powdery polymer material 5 is electrically charged.
  • the pulverulent polymer material 5 is swirled in such a way that a cloud 18 of non-agglomerated and electrically charged pulverulent polymer material is formed.
  • the fabric 2 For depositing the electrically charged and pulverulent polymer material 5, the fabric 2 is transported through the cloud 18, whereby the polymer material 5 is uniformly deposited on the free surface 4 of the basic structure 3 by means of electrical attraction.
  • the entire surface 4 exposed to the polymer material 5 in the deposition chamber 6 is at the same electrical potential.
  • Part of the cloud 18 is conveyed out of the separation chamber 6 via a suction line 19.
  • the fabric 2 After the polymer material 5 is deposited on the free surface 4, is the fabric 2 then transported into the activation space 9, where the polymer material 5 is thermally activated by means of radiant heat, so that the polymer material 5 firmly connects to the basic structure 3.

Landscapes

  • Nonwoven Fabrics (AREA)
  • Paper (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
EP05106918A 2004-09-17 2005-07-27 Procédé de fabrication d'une habillage de machines à papier Withdrawn EP1637647A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004045087A DE102004045087A1 (de) 2004-09-17 2004-09-17 Verfahren zur Herstellung einer Papiermaschinenbespannung

Publications (1)

Publication Number Publication Date
EP1637647A1 true EP1637647A1 (fr) 2006-03-22

Family

ID=35447999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05106918A Withdrawn EP1637647A1 (fr) 2004-09-17 2005-07-27 Procédé de fabrication d'une habillage de machines à papier

Country Status (3)

Country Link
US (1) US20060068119A1 (fr)
EP (1) EP1637647A1 (fr)
DE (1) DE102004045087A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4981745A (en) * 1989-05-26 1991-01-01 Lefkowitz Leonard R Forming fabric for papermaking
US5094883A (en) * 1989-04-17 1992-03-10 Georgia Tech Research Corporation Flexible multiply towpreg and method of production therefor
EP0786551A1 (fr) * 1996-01-25 1997-07-30 CONRAD MUNZINGER & CIE AG Procédé pour la fabrication d'une bande de matériau
EP0987366A2 (fr) * 1998-09-14 2000-03-22 Jwi Ltd Feutre de presse à essorage amélioré
WO2004083500A2 (fr) * 2003-03-21 2004-09-30 Voith Fabrics Patent Gmbh Tissus industriels

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL294399A (fr) * 1962-06-22
US4594286A (en) * 1985-05-07 1986-06-10 Graniteville Company Coated fabric
GB8717729D0 (en) * 1987-07-27 1987-09-03 Bonar Carelle Ltd Non-woven materials

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5094883A (en) * 1989-04-17 1992-03-10 Georgia Tech Research Corporation Flexible multiply towpreg and method of production therefor
US4981745A (en) * 1989-05-26 1991-01-01 Lefkowitz Leonard R Forming fabric for papermaking
EP0786551A1 (fr) * 1996-01-25 1997-07-30 CONRAD MUNZINGER & CIE AG Procédé pour la fabrication d'une bande de matériau
EP0987366A2 (fr) * 1998-09-14 2000-03-22 Jwi Ltd Feutre de presse à essorage amélioré
WO2004083500A2 (fr) * 2003-03-21 2004-09-30 Voith Fabrics Patent Gmbh Tissus industriels

Also Published As

Publication number Publication date
DE102004045087A1 (de) 2006-03-23
US20060068119A1 (en) 2006-03-30

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