EP1601834B1 - Dryer wire - Google Patents

Dryer wire Download PDF

Info

Publication number
EP1601834B1
EP1601834B1 EP04714343A EP04714343A EP1601834B1 EP 1601834 B1 EP1601834 B1 EP 1601834B1 EP 04714343 A EP04714343 A EP 04714343A EP 04714343 A EP04714343 A EP 04714343A EP 1601834 B1 EP1601834 B1 EP 1601834B1
Authority
EP
European Patent Office
Prior art keywords
yarns
wire
grooves
dryer
longitudinal yarns
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.)
Expired - Lifetime
Application number
EP04714343A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1601834A1 (en
Inventor
Rauno Enqvist
Jari Stalhammar
Marja Ojanen
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.)
Valmet Fabrics Oy
Original Assignee
Tamfelt Oy AB
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 Tamfelt Oy AB filed Critical Tamfelt Oy AB
Publication of EP1601834A1 publication Critical patent/EP1601834A1/en
Application granted granted Critical
Publication of EP1601834B1 publication Critical patent/EP1601834B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths

Definitions

  • the invention relates to a dryer wire: which comprises a back surface and a surface facing the web to be dried; which has been woven from a plurality of machine direction longitudinal yarns and a plurality of cross machine direction transverse yarns; where the cross section of the longitudinal yarns is flat; and where longitudinal yarns are arranged in at least a first layer and a second layer, which are one on top of the other (e.g. see: document WO-A-0188260).
  • a dryer section of a paper machine employs dryer wires, by means of which a paper web to be dried is guided through the dryer section.
  • the weave of a dryer wire is formed from yarns that sustain high temperatures and moisture using suitable weave structures.
  • the dryer wires also carry air with them, which may cause problems during the run in high-speed paper machines, in particular.
  • the aerodynamic properties of existing wires have proven inadequate in some situations.
  • the object of the invention is to provide a new and improved dryer wire.
  • the dryer wire of the invention is characterized in that at least one surface of the wire is provided with a plurality of machine direction grooves and that at least some of the longitudinal yarns travelling in the first layer are arranged to partly overlap the longitudinal yarns travelling in the second layer, the total width of the partly overlapping yarns being greater than that of a single longitudinal yarn.
  • the invention is based on the idea that at least one surface of the wire is provided with a plurality of longitudinal grooves. Furthermore, longitudinal yarns of the overlapping layers are arranged to partly overlap each other, which makes the structure denser.
  • An advantage of the invention is that the air carried in the wire can be controlled well since the grooves guide airflows in the longitudinal direction of the wire.
  • the wire has good aerodynamic properties, and consequently, the runability of the wire is good.
  • the wire runability is further improved by the fact that the longitudinal yarns arranged to overlap each other make the wire structure denser, and thus the wire may have a relatively low air permeability.
  • High-speed paper machines, in particular, require a dense structure.
  • the grooves the drying capacity of the wire may be better than earlier.
  • a further advantage is that the cleaning of the wire becomes easier since at least some of the water sprays of a typical injection device also hit the grooves, and thus the water sprays can also act on the dirt stuck onto the wire surface from below.
  • an advantage is that the grooves are empty and have a shape which prevents dirt from sticking to them easily. Thanks to the basic structure of the wire according to the invention, the wire is also wear resistant and stable in use.
  • the depth of the grooves is substantially equal at least to the thickness of the longitudinal yarns that travel on the surface provided with grooves.
  • the grooves are distinct and sufficiently large for guiding airflows.
  • the cross section of the grooves has the shape of a substantially sharp-angled letter U. It is easy to remove dirt from a groove of this shape.
  • the groove is free from yarns that could hinder the airflow, in which case the airflow passing in the groove is not subjected to significant turbulence.
  • the basic idea of an embodiment of the invention is that at least the transverse yarns are made of a material that shrinks considerably in heat and that the wire has been treated thermally after weaving to provide the wire surface with machine direction grooves.
  • the basic idea of an embodiment of the invention is that the surface of the transverse yarns has been treated with a friction reducing substance before weaving.
  • the basic idea of an embodiment according to the invention is that longitudinal yarns are provided in two layers and that the cover ratio formed by the longitudinal yarns is less than 80%.
  • the basic idea of an embodiment according to the invention is that the air permeability of the dryer wire is less than 5000 m 3 /m 2 h.
  • the wire comprises longitudinal grooves both on the back surface and on the surface facing the web to be dried.
  • Figure 1 illustrates a dryer wire of the invention, which has been woven from a plurality of machine direction MD longitudinal yarns 1 and a plurality of cross machine direction CMD transverse yarns 2, 3 and 4.
  • the wire comprises a back surface (A) and a surface (B) facing the web to be dried.
  • the longitudinal yarns 1 may have the cross section of a flat monofilament, having the shape of a rectangle with rounded edges or an oval shape, for example.
  • the flat yarn refers to a yarn with a greater dimension in the width direction than in the height direction.
  • the transverse yarns 2 to 4 may have the cross section of round monofilaments. Alternatively, flat transverse yarns may be used or the transverse yarns may be made of 'soft yarn', which may shape up during the manufacture.
  • the longitudinal yarns may be made of polyethylene terephthalate (PET), polyamide (PA), polyphenylenesuplhide (PPS), polyether etherketone (PEEK), polymethylene cyclohexylene terephthalate (PCTA) or polyethylene naphthalate (PEN).
  • PET polyethylene terephthalate
  • PA polyamide
  • PPS polyphenylenesuplhide
  • PEEK polyether etherketone
  • PCTA polymethylene cyclohexylene terephthalate
  • PEN polyethylene naphthalate
  • the transverse yarns 2 to 4 may be made of one of the above-mentioned materials.
  • the longitudinal yarns 1 travelling on the wire surface A may be arranged in a plurality of groups formed by at least two longitudinal yarns 1. Seen in the cross machine direction CMD of the wire, the longitudinal yarns 1 are substantially against each other in the groups. In that case, there are machine direction MD grooves 5 between these yarn groups. Grooves 5 may be provided only on one surface of the wire or alternatively on its both surfaces. The grooves 5 can be formed during weaving. The groove 5 formation can be influenced by selecting a certain weave structure for the wire, certain materials for the yarns or certain settings for the weaving machine. In the weave structure of the wire according to the invention, the number of longitudinal yarns 1 may be relatively scarce in relation to the width of the longitudinal yarns 1, which facilitates the formation of grooves 5.
  • grooves 5 may be influenced by applying an abnormally high tension to the longitudinal yarns 1 during weaving. This generates cross forces in the wire to be woven, pulling the longitudinal yarns 1 so that they will overlap.
  • the tension on longitudinal yarns 1 may be over 10 kN/m, preferably over 15 kN/m.
  • the surface of the transverse yarns 2 to 4 may have been made slippery so that the longitudinal yarns 1 move easier due to the influence of the weaving forces, enabling the formation of the grooves 5.
  • a material with a small friction coefficient can be selected as the material for the transverse yarns 2 to 4 or the transverse yarns 2 to 4 may be alternatively treated with a friction reducing material before weaving, such as polytetrafluoroethene (PTFE).
  • PTFE polytetrafluoroethene
  • the outer surface of the transverse yarns 2 to 4 may be coated with a friction reducing material or it may be treated by spraying the transverse yarns with a friction reducing material, for example.
  • the groove 5 formation can be influenced by selecting a material that shrinks considerably in heat for the transverse yarns 2 to 4.
  • the wire can be treated thermally, in which case the shrinking of the transverse yarns 2 to 4 may intensify the groove 5 formation.
  • the thermal treatment may stabilize the wire structure since the yarns attach better to each other and form yarn floats.
  • the wire comprises longitudinal yarns 1 in two overlapping and adjacent layers.
  • Longitudinal yarns 1a travelling on the back surface A of the wire and longitudinal yarns 1 b travelling on the surface B facing the web partly overlap by a predetermined distance M.
  • the distance M is clearly shorter than the width P of the longitudinal yarns 1a and 1b.
  • the total width N of the longitudinal yarns 1 a and 1b is always greater than the width of a single longitudinal yarn 1 a or 1 b.
  • the longitudinal yarns 1a and 1b of different layers are arranged to partly overlap, the resulting structure is dense.
  • the air permeability of the wire can be rendered sufficiently small so that the wire is also suitable for use in high-speed paper machines.
  • the air permeability of a dryer wire may be less than 5000 m 3 /m 2 h.
  • the weave structure of the wire can be selected so that the transverse yarns 2, 3 and 4 keep the longitudinal yarns 1 firmly in the partly overlapping position described above.
  • the weave structure may be selected so that the wire will be stable in a paper machine.
  • Figure 2 further shows that the cross section of the grooves 5 may have the shape of a sharp-angled letter U. This shape is illustrated with line 6 in the figure.
  • airflows are not subjected to significant turbulence.
  • dirt does not easily stick to this kind of groove.
  • the grooves on the wire surface intensify drying.
  • the cross section of the longitudinal yarns 1 is oval, for example, the cross section of the grooves 5 differs from that shown in Figure 2. Nevertheless, the grooves 5 may be deep and the bottom of the grooves 5 flat. Thus airflows can easily pass along the grooves 5 in this case, too.
  • the width L of the grooves 5 is at least 0.4 mm and their depth S at least 0.2 mm.
  • the weave structure of the wire may differ from those illustrated in Figures 1 and 2.
  • longitudinal yarns may be arranged into groups of three longitudinal yarns instead of two yarns, for instance.
  • longitudinal and transverse yarns may be in arranged in several layers.

Landscapes

  • Woven Fabrics (AREA)
  • Paper (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Drying Of Solid Materials (AREA)
EP04714343A 2003-02-26 2004-02-25 Dryer wire Expired - Lifetime EP1601834B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20030290A FI113070B (fi) 2003-02-26 2003-02-26 Kuivatusviira
FI20030290 2003-02-26
PCT/FI2004/000100 WO2004076742A1 (en) 2003-02-26 2004-02-25 Dryer wire

Publications (2)

Publication Number Publication Date
EP1601834A1 EP1601834A1 (en) 2005-12-07
EP1601834B1 true EP1601834B1 (en) 2007-04-11

Family

ID=8565723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04714343A Expired - Lifetime EP1601834B1 (en) 2003-02-26 2004-02-25 Dryer wire

Country Status (5)

Country Link
EP (1) EP1601834B1 (fi)
AT (1) ATE359394T1 (fi)
DE (1) DE602004005835T2 (fi)
FI (1) FI113070B (fi)
WO (1) WO2004076742A1 (fi)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2424227A (en) * 2005-03-16 2006-09-20 James Harrison Woven papermaking fabric
FI128025B (fi) 2017-03-24 2019-08-15 Valmet Technologies Oy Teollisuuskangas

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1761092B2 (de) * 1968-04-02 1976-06-10 Kerber, Heinz, 6731 Weidenthal Genadelter nass- bzw. trockenfilz fuer papier- und zellstoffmaschinen
US4382987A (en) * 1982-07-30 1983-05-10 Huyck Corporation Papermaker's grooved back felt
CA2083211C (en) * 1992-11-09 1996-07-09 Robert W. Legge Papermaker felt
FI107550B (fi) * 2000-05-18 2001-08-31 Tamfelt Oyj Abp Kuivatusviira

Also Published As

Publication number Publication date
DE602004005835T2 (de) 2007-09-06
WO2004076742A1 (en) 2004-09-10
FI113070B (fi) 2004-02-27
ATE359394T1 (de) 2007-05-15
EP1601834A1 (en) 2005-12-07
DE602004005835D1 (de) 2007-05-24
FI20030290A0 (fi) 2003-02-26

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