EP1662038A1 - Toile de séchage - Google Patents

Toile de séchage Download PDF

Info

Publication number
EP1662038A1
EP1662038A1 EP04104188A EP04104188A EP1662038A1 EP 1662038 A1 EP1662038 A1 EP 1662038A1 EP 04104188 A EP04104188 A EP 04104188A EP 04104188 A EP04104188 A EP 04104188A EP 1662038 A1 EP1662038 A1 EP 1662038A1
Authority
EP
European Patent Office
Prior art keywords
strip
drying
strips
transition
fibrous web
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Withdrawn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
EP04104188A
Other languages
German (de)
English (en)
Inventor
Torben Schlieckau
Andreas Hosemann
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
Priority to EP04104188A priority Critical patent/EP1662038A1/fr
Publication of EP1662038A1 publication Critical patent/EP1662038A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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 to a dryer fabric of a machine for producing or refining paper, board or tissue according to the preamble of patent claim 1.
  • a fibrous web is dried in the dryer section of a paper, board or tissue machine.
  • the fibrous web is brought into contact with heated drying cylinders of the dryer section.
  • the close contact between the drying cylinders and the fibrous web is mediated by a drying wire which presses the fibrous web to the drying cylinders.
  • a dryer fabric usually consists of a fabric belt with high gas or air permeability. Due to the high gas or air permeability, it is possible to carry away moisture evaporating from the fibrous web through the dryer fabric. Furthermore, holding the fibrous web on the dryer fabric is made possible by generating negative pressure on the side of the dryer fabric (running side) facing away from the fibrous web, whereby the fibrous web is "sucked" to the dryer fabric as a result of the air permeability of the dryer fabric.
  • Modern drying sections usually have a slalom web guide - often referred to as a single-row dryer section - on.
  • the fibrous web is guided in a slalom line, usually alternately on drying cylinders and preferably acted upon by vacuum guide rollers.
  • the fibrous web is only on the drying wire.
  • a negative pressure is generated by the arranged on the running side of the dryer fabric web stabilizers, whereby the fibrous web is "sucked” in the web stabilizers to the dryer fabric.
  • the gap between the web stabilizers and the dryer fabric must be sealed from the ambient air.
  • Air knives which are air nozzles exiting through the air at high speed, sealed.
  • the dryer fabric Since the dryer fabric is wider than the fibrous web passed through the dryer fabric, the dryer fabric is not covered by the fibrous web over its entire width. Rather, the fibrous web comes to the dryer fabric to form a common overlap region to the plant, with a portion of the dryer fabric (free area) is not covered by the fibrous web.
  • the free area of the dryer fabric here comprises the two edge strips which laterally delimit the dryer fabric.
  • the object of the present invention is to propose a drying wire, in which a lifting or folding over the edges of the fibrous web is prevented.
  • the generic dryer fabric has a central strip and parallel to this and the drying wire in its width limiting edge strips.
  • the fibrous web on the dryer fabric to form an overlap region comprising the central region, can be brought to bear.
  • a free region is formed, which comprises the two edge strips of the dryer fabric.
  • the edge strips which are wider than the usual edge regions for bonding the threads of the dryer fabric, have a lower air permeability than the center strip.
  • the invention is therefore based on the idea of creating a dryer fabric in which at least the edge strips of the free area are less permeable to air than the center strip covered with the fibrous web. As a result, the averaged over the free area air permeability is significantly reduced.
  • the invention thus reduces or collapses the Negative pressure in the edge region of the fibrous web prevented since the air permeability in the free area of the dryer fabric is greatly reduced.
  • a preferred embodiment of the invention provides that the edge strips are completely air-impermeable.
  • An additional reduction in the air permeability of the free area of the dryer fabric can be achieved by the entire free area is formed by the reduced in their air permeability edge strips.
  • the fibrous web to be dried in the dryer section of a paper, board or tissue machine undergoes inter alia a shrinkage in its width during the drying process.
  • a relative lateral offset between the drying wire and the fibrous web can not be prevented during transport through the dryer section.
  • Both the shrinkage of the width of the fibrous web and the relative lateral offset between the dryer fabric and the fibrous web can result in regions of the dryer fabric which have a high air permeability not being covered by the fibrous web.
  • the overlapping area of the dryer fabric has transition strips which laterally delimit it and which have a lower air permeability than the center strip.
  • an edge region of the fibrous web can be brought to bear on one of the transition strips.
  • the width of the two transition strips is designed so that at least the shrinkage or the lateral offset are kept.
  • edge strips of the free area have a different air permeability than the rest of the free area.
  • An embodiment which is particularly easy to realize in terms of production provides that the free area and the transition strips have the same reduced air permeability.
  • the edge strips have another, i. usually denser weave than the median strip.
  • the tissue in the region of the edge strips, in contrast to the median strip is glued and / or gummed and / or welded.
  • the free area is formed by the edge strips, this naturally means that the entire free area has a different weave or is glued, gummed or welded.
  • the dryer fabric has the previously described transition stripes, its reduced air permeability can also be realized by having the transition stripes have a weave other than the median strip and / or by gluing, resinifying or welding the transition stripes.
  • the dryer fabric can also be formed by a perforated tape.
  • the perforation in particular the perforated surface of the edge strips influencing the air permeability of the strip, and optionally also the transition strip, should differ from the perforation of the center strip.
  • At least the running side of the edge strip and / or the transition strip of the dryer fabric has a smooth surface.
  • the efficiency of the air knife seal can be further increased because the formation of boundary air layers and vortices is reduced by the smooth surface of the dryer fabric.
  • FIG. 1 shows, in a cross-sectional view in section, an inventive dryer fabric (1), which is guided through a web stabilizer (2) in a dryer section. Furthermore, a section of a portion of the fabric on the dryer fabric (1) brought to the plant fibrous web (3) is shown.
  • FIG. 1 the transport direction V of the dryer fabric runs perpendicular to the plane of the drawing.
  • the dryer fabric (1) can be seen in the illustration of Figure 1, approximately only on its half width. A representation of the dryer fabric (1) over its entire width is shown in FIG. 2.
  • the dryer fabric 1 of the present embodiment is formed in its width, from left to right, by an edge strip 4, an adjoining transition strip 5 and an adjoining the transition strip 5 center strip 6.
  • the fibrous web 3 comes on the dryer fabric 1 only in sections, forming an overlap region and a free area to the plant.
  • the entire free area is formed by the edge strip 4. Furthermore, the edge region 12 of the fibrous web 3 comes on the transition strip 5 to the plant.
  • the edge strip 4 and the transition strip 5 have a lower air permeability than the center strip 6.
  • the edge strip 4 and the transition strip 5 have the same air permeability.
  • a negative pressure 7 is generated on the side of the dryer fabric 1 facing away from the fibrous web 3, the so-called running side 9, so that the fibrous web 3 is sucked against the dryer fabric 1.
  • the interior of the web stabilizer 2 is for this purpose subjected to negative pressure, wherein on the, the running side 9 facing surface of the web stabilizer 2, via communicating with the interior of the web stabilizer 2 nozzles 8, the negative pressure 7 is generated.
  • the reduced air permeability of the edge strip 4 ensures that no air can be sucked in via the free area not covered by the fibrous web 1.
  • the reduced air permeability of the transition strip 5 ensures that even with shrinkage of the width of the fibrous web 3 or lateral offset of the fibrous web 3 relative to the dryer fabric 1, no air can be sucked through the thus formed and not covered with the fibrous web 1 area.
  • an air jet exits at high speed via a nozzle 10 arranged laterally on the web stabilizer 2.
  • the lateral sealing can also be done mechanically, for example with a felt.
  • FIG. 2 shows a longitudinal section of the dryer fabric (1) according to the invention in plan view.
  • the dryer fabric (1) is shown over its entire width.
  • the dryer fabric (1) has a central strip (6) which extends parallel to the transport direction V of the dryer fabric.
  • the median strip is bounded on both sides by parallel to this extending transition strip (5).
  • At each transition strip (5) is followed by the drying wire (1) in its width final edge strip (4) with edge (11).

Landscapes

  • Paper (AREA)
EP04104188A 2004-10-06 2004-10-06 Toile de séchage Withdrawn EP1662038A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04104188A EP1662038A1 (fr) 2004-10-06 2004-10-06 Toile de séchage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04104188A EP1662038A1 (fr) 2004-10-06 2004-10-06 Toile de séchage

Publications (1)

Publication Number Publication Date
EP1662038A1 true EP1662038A1 (fr) 2006-05-31

Family

ID=36204593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04104188A Withdrawn EP1662038A1 (fr) 2004-10-06 2004-10-06 Toile de séchage

Country Status (1)

Country Link
EP (1) EP1662038A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8241464B2 (en) 2008-02-01 2012-08-14 Albany International Corp. Papermaking clothing defining a width of a paper web and associated system and method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867766A (en) * 1967-12-22 1975-02-25 Huyck Corp Dryer fabric for a papermaking machine
US4537658A (en) * 1982-09-30 1985-08-27 Scapa Inc. Papermakers fabric constructed of extruded slotted elements
US4784190A (en) * 1980-10-16 1988-11-15 Huyck Corporation Dryer fabric having longitudinal zones of different permeability
DE20107844U1 (de) * 2000-07-31 2001-07-26 Voith Paper Patent Gmbh Trockensieb

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867766A (en) * 1967-12-22 1975-02-25 Huyck Corp Dryer fabric for a papermaking machine
US4784190A (en) * 1980-10-16 1988-11-15 Huyck Corporation Dryer fabric having longitudinal zones of different permeability
US4537658A (en) * 1982-09-30 1985-08-27 Scapa Inc. Papermakers fabric constructed of extruded slotted elements
DE20107844U1 (de) * 2000-07-31 2001-07-26 Voith Paper Patent Gmbh Trockensieb

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8241464B2 (en) 2008-02-01 2012-08-14 Albany International Corp. Papermaking clothing defining a width of a paper web and associated system and method
US8758568B2 (en) 2008-02-01 2014-06-24 Albany International Corp. Papermaking clothing defining a width of a paper web and associated system and method

Similar Documents

Publication Publication Date Title
DE102006062235A1 (de) Verfahren und Vorrichtung zur Trocknung einer Faserstoffbahn
DE3328162A1 (de) Papiermaschine
AT403385B (de) Zwei-sieb-zylindertrockner
WO2012095251A1 (fr) Habillage perforé de type feuille muni d'un bord résistant au déchirement
DE4009287B4 (de) Verfahren und Vorrichtung zum Trocknen einer feuchten Papierbahn in einer Papiermaschinen-Trockenpartie
DE3715551A1 (de) Verfahren zum verringern des flatterns der bahnraender einer papierbahn sowie papiermaschine zum durchfuehren des verfahrens
EP1013820A2 (fr) Tissu composite pour la fabrication du papier comportant au moins trois couches
EP1662038A1 (fr) Toile de séchage
EP2712958A1 (fr) Dispositif et procédé de fabrication d'une bande de matière
EP4150150B1 (fr) Habillage et procédé de production d'un tel habillage
WO2019007561A1 (fr) Habillage et procédé de fabrication pour ledit habillage
DE10341183A1 (de) Trockensieb
EP2809520B1 (fr) Dispositif d'une presse rotative à imprimer pour le traitement d'une ou de plusieurs bandes continues imprimées et procédé de formation d'un faisceau plié dans le sens de la longueur
DE3715554C2 (fr)
DE19538149A1 (de) Verfahren und Stoffauflauf für eine Papier- oder Kartonmaschine zur Herstellung einer mindestens dreischichtigen Bahn
EP3475481B1 (fr) Toile pour une machine de fabrication d'une bande de matériau fibreux et procédé de fabrication d'une telle toile
EP3433420B1 (fr) Dispositif et procédé de fabrication d'une bande de matière fibreuse multicouche
DE19654434A1 (de) Maschine zur Herstellung einer kontinuierlichen Materialbahn
WO2008101865A1 (fr) Bande de presse
EP1075568B1 (fr) Machine et procede permettant de fabriquer une bande de tissu fibreux multicouche
DE102005044014A1 (de) Verfahren zum Einbau eines Transferbandes in eine Papiermaschine
DE10259379A1 (de) Trockenpartie einer Papier- oder Kartonmaschine
WO2015091095A1 (fr) Ruban textile pour machine de production de bandes de matière fibreuse
EP2205792B1 (fr) Formeur à double toile
WO2007033877A1 (fr) Habillage pour machine a papier

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL HR LT LV MK

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: VOITH PATENT GMBH

17P Request for examination filed

Effective date: 20061130

17Q First examination report despatched

Effective date: 20070109

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20070522