EP0778910B1 - Papiermaschinenbespannung - Google Patents

Papiermaschinenbespannung Download PDF

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Publication number
EP0778910B1
EP0778910B1 EP95929947A EP95929947A EP0778910B1 EP 0778910 B1 EP0778910 B1 EP 0778910B1 EP 95929947 A EP95929947 A EP 95929947A EP 95929947 A EP95929947 A EP 95929947A EP 0778910 B1 EP0778910 B1 EP 0778910B1
Authority
EP
European Patent Office
Prior art keywords
machine direction
fabric
direction yarns
yarns
cross
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
EP95929947A
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English (en)
French (fr)
Other versions
EP0778910A2 (de
Inventor
Mark Hodson
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.)
Scapa Group Ltd
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Scapa Group Ltd
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Filing date
Publication date
Application filed by Scapa Group Ltd filed Critical Scapa Group Ltd
Publication of EP0778910A2 publication Critical patent/EP0778910A2/de
Application granted granted Critical
Publication of EP0778910B1 publication Critical patent/EP0778910B1/de
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
    • 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
    • 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 present invention relates to papermakers fabrics and particularly, but not exclusively, to a fabric for use in the dryer section of a papermaking machine.
  • papermaking machines are made up of three sections, namely the forming, pressing and drying sections.
  • a fabric belt is used to transport a continuous paper sheet through the papermaking equipment as the paper is being manufactured.
  • the structure of the fabrics for each section differs, as the requirements of each section of the papermachine are different.
  • a forming fabric must have both a precise permeability which provides the required water drainage and a surface matched to the fibre type being processed, whereas a press fabric must be capable of rapidly absorbing and expelling water while protecting the newly formed paper sheet.
  • Dryer fabrics are designed for heat resistance, high durability in adverse chemical and physical conditions and permeability.
  • Patent application wo 91/19044 describes a papermakers dryer fabric incorporating flat monofilament machine direction yarns interwoven with the cross machine direction yarns in a manner such that floats are provided on the upper and lower surfaces of the fabric.
  • the floats provide a smooth fabric surface.
  • the system of machine direction yarns comprises upper and lower yarns which are vertically stacked in order to control the permeability of the fabric.
  • the machine direction yarns are woven contiguous with each other to reduce the permeability of the fabric and to lock in the machine direction alignment of the stacking pairs of machine direction yarns.
  • a papermakers fabric woven from machine direction yarns and one or more layers of cross-machine direction yarns, the cross-machine direction yarns in at least one of the layers comprising relatively large and small yarns and the machine and cross machine direction yarns being arranged such that the machine direction yarns define outer floats or knuckles on one of the faces of the fabric and inner floats or knuckles below said one face around small cross machine direction yarns in one of the cross machine direction yarn layers, wherein the parts of the machine direction yarns defining the inner floats or knuckles below said one face do not extend to the plane of the obverse face of the fabric, characterized in that the parts of the machine direction yarns defining the inner floats or knuckles below said one face are spaced from the observe face of the fabric by air.
  • all of the layers of cross machine direction yarns comprise relatively large and small yarns.
  • floats are provided by machine direction yarns on both the said one and obverse surfaces of the fabric with all of the inner machine direction floats or knuckles being located within the body of the fabric between the said one and obverse face of the fabric.
  • the fabric of the invention has particular, but not exclusive, application as a dryer fabric.
  • the opposite face of the yarn is insulated by air from heat from a dryer cylinder.
  • air is a better thermal insulation medium than fabric
  • the papermakers fabric of the invention offers exceptional resistance to heat degradation, whilst the increased remoteness of the yarns from the fabric surface increases the resistance to degradation by wear and hydrolysis. This is of upmost importance in the dryer section of a papermachine.
  • the machine direction yarns floating on one face and the machine direction yarns floating on the obverse face of the fabric may be made from the same material or different materials.
  • the same or different materials may be used for the cross machine direction yarns provided at said one face and the obverse face of the fabric and/or within the individual cross machine direction layers.
  • Suitable materials for the machine direction yarns include polyesters, such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyamides, polyphenylene sulphide (PPS), polyetheretherketone (PEEK) or PCTA (copolymers of cyclohexane dimethanol with terephthalic acid and isophthalic acid).
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • PPS polyphenylene sulphide
  • PEEK polyetheretherketone
  • PCTA copolymers of cyclohexane dimethanol with terephthalic acid and isophthalic acid.
  • machine direction yarns on one surface of the fabric do not come into contact with the opposite surface of the fabric in the dryer machine section, machine direction yarns at the paper side of the fabric will not come into contact with the dryer cylinders and will therefore not be subjected to such extreme temperatures.
  • the yarns provided at the opposite surface of the fabric may be chosen to exhibit improved resistance to abrasion and heat.
  • the working life of the fabric may be increased.
  • the cross machine direction weft yarns are typically made from polyester (e.g. PEN, PCTA), PPS, PEEK or combinations thereof.
  • a further novel aspect of the invention is the use of different combination patterns of cross machine direction yarn sizes in order to control permeability.
  • Typical cross machine direction yarn sizes are 0.3mm diameter alternating with 0.6mm, 0.4mm or 0.2mm.
  • WO 91/19044 achieves permeability control by altering the number of machine direction yarns and cross machine direction yarns in the fabric. This is disadvantageous compared with altering the difference between the cross machine direction yarn diameters since it involves time consuming re-setting of the loom.
  • Other alternative methods of permeability control include the insertion of stuffer cross machine direction yarns, altering the number of machine direction yarns, changing the cross machine direction yarn density and utilising non-circular or multifilament cross machine direction and/or machine direction yarns.
  • cross machine direction yarn diameter combinations are 0.5mm and 0.7mm; 0.5mm and 0.8mm; 0.5mm and 0.9mm; and 0.4mm and 0.9mm.
  • the difference in diameter of the cross machine direction yarns is preferably in the range from 0.1mm to 0.6mm.
  • the fabric comprises at least two layers of cross machine direction yarns.
  • Preferably all of the layers of cross machine direction yarns comprise relatively large and small yarns.
  • the large and small yarns are preferably provided in an alternating fashion both in any single cross machine direction yarn layer and vertically in adjacent layers.
  • "Stuffer" cross machine direction yarns are further included in order to control the permeability. These are incorporated by weaving cross machine direction yarns having a large surface area into the fabric. The incorporation of additional yarns would decrease the permeability of the fabric. These additional yarns are preferably profiled yarns.
  • the machine direction yarns of the invention are preferably flat monofilaments preferably having an aspect ratio in the range from 2:1 to 4:1.
  • other profiled (i.e. non-circular cross section) yarns may be used such as triangular yarns.
  • circular cross-section yarns may be used.
  • "D" shaped yarns Such yarns would be arranged such that the curved surface faces into the body of the fabric. The curved surface gives improved resistance to contamination and facilitates easy cleaning of the yarns (using high pressure air/water jets).
  • the fabric may contain different cross sectional sizes and/or shapes of machine direction yarns, for example as an alternative means of keeping certain yarns out of contact with the sheet and/or dryer cylinders.
  • the machine direction yarns float over at least two relatively large cross machine direction yarns and any small cross machine direction yarns therebetween thereby forming a float.
  • the knuckle from the machine direction yarn provided at the opposite surface of the fabric would be formed under a single cross machine direction yarn in the fabric.
  • a fabric 10 comprises a single layer of relatively large and small cross machine direction yarns arranged alternately.
  • a first machine direction yarn 11 extends above two large cross machine direction yarns 12,13 and a small cross machine direction yarn 14 located therebetween so as to form a float.
  • the yarn then passes below a small cross machine direction yarn 15 to form a knuckle and then over a further pair of large cross machine direction yarns 16,17 and a small cross machine direction yarn 18.
  • the majority of the machine direction yarn 11 is thus located at the upper surface of the fabric.
  • the parts of the machine direction yarn 11 forming the knuckles do not extend as far as the lower surface of the fabric.
  • the other machine direction yarns 19 provided at the upper surface of the fabric are arranged in the same manner.
  • the machine direction yarns 20 provided at the lower surface of the fabric float below two large cross machine direction yarns and one small cross machine direction yarn located therebetween. The yarn then extends over a small cross machine direction yarn so as to form a knuckle and then over two further large cross machine direction yarns and an intermediate small cross machine direction yarn.
  • the machine direction yarns provided at the lower surface of the fabric do not therefore extend to the upper surface of the fabric.
  • the fabric is formed into a belt for a paper dryer machine.
  • the yarns on one surface of the fabric support the paper and are typically made from PPS, PEN, PEEK or PCTA which exhibit good resistance to degradation by heat, steam and wear.
  • the yarns at the other surface of the fabric are typically made from polyester which exhibits good resistance to dry heat degradation.
  • Fig.2 shows a further fabric 21 in accordance with the invention having two layers 22,23 of cross machine direction yarns, each layer comprising relatively large and small cross machine direction yarns arranged alternately.
  • the cross machine direction yarns of the two layers are preferably, but not exclusively stacked in a manner such that a small cross machine direction yarn is located above a large cross machine direction yarn and a large cross machine direction yarn is located above a small cross machine direction yarn.
  • a machine direction yarn 24 floats over two large cross machine direction yarns 25,26 at the upper surface and an intermediate small cross machine direction yarn 27.
  • the yarn then passes below a small cross machine direction yarn 28 in the upper layer 22, and a small cross machine direction yarn 29 in the lower layer 23 and a further small cross machine direction yarn in the upper layer 30.
  • the machine direction yarn 24 then repeats this weave pattern along the length of the fabric.
  • the other machine direction yarns 31 at the upper surface are similarly arranged.
  • the machine direction yarns 32,33 provided at the lower surface are arranged in a mirror image to the upper cross machine direction yarns.
  • machine direction yarns defining floats at the base of the fabric do not extend to the upper surface and the machine direction yarns defining floats at the top surface of the fabric do not extend to the lower surface of the fabric.

Claims (16)

  1. Papiermaschinengewebe mit in Maschinenrichtung liegenden Fäden (11, 19, 20, 24, 31 bis 33) und einer oder mehreren Lagen (22, 23) von in Maschinenquerrichtung liegenden Fäden (12 bis 18; 25 bis 30), wobei die in Maschinenquerrichtung liegenden Fäden (12 bis 18; 25 bis 30) in mindestens einer Lage (22, 23) relativ dicke Fäden (12, 13, 16, 17, 25, 26) und relativ dünne Fäden (14, 15, 18, 27 bis 30) aufweisen und die in Maschinenrichtung sowie die in Maschinenquerrichtung liegenden Fäden derart angeordnet sind, daß die in Maschinenrichtung liegenden Fäden (11, 19, 20; 24, 31 bis 33) äußere Flottierungen oder Hügel auf einer Seite des Gewebes und unter dieser Gewebeseite innere Flottierungen oder Hügel um in Maschinenquerrichtung liegende dünne Fäden (14, 15, 18, 27 bis 30) in einer der Lagen (22, 23) von in Maschinenquerrichtung liegenden Fäden bilden, und wobei sich die Abschnitte der in Maschinenrichtung liegenden Fäden (11, 19, 20, 24, 31 bis 33), die unter dieser Gewebeseite die inneren Flottierungen oder Hügel bilden, nicht bis zur Ebene der gegenüberliegenden Gewebeseite erstrecken,
    dadurch gekennzeichnet, daß die Abschnitte der in Maschinenrichtung liegenden Fäden (11, 19, 20, 24, 31 bis 33), welche die inneren Flottierungen oder Hügel unter der einen Gewebeseite bilden, von der Ebene der gegenüberliegenden Gewebeseite durch Luft getrennt sind.
  2. Papiermaschinengewebe nach Anspruch 1,
    wobei alle Lagen (22, 23) von in Maschinenquerrichtung liegenden Fäden (25 bis 30) relativ dicke Fäden (25, 26) und relativ dünne Fäden (27 bis 30) aufweisen.
  3. Papiermaschinengewebe nach Anspruch 1 oder 2,
    wobei in Maschinenrichtung liegende, auf der einen Seite des Gewebes flottierende Fäden (11, 19; 24, 31) aus demselben Material hergestellt sind wie in Maschinenrichtung liegende flottierende Fäden (20; 32, 33) auf der gegenüberliegenden Seite des Gewebes.
  4. Papiermaschinengewebe nach Anspruch 1 oder 2,
    wobei in Maschinenrichtung liegende, auf der einen Seite des Gewebes flottierende Fäden (11, 19, 24, 31) aus unterschiedlichem Material hergestellt sind als in Maschinenrichtung liegende flottierende Fäden (20, 32, 33) auf der gegenüberliegenden Seite des Gewebes.
  5. Papiermaschinengewebe nach einem vorhergehenden Anspruch,
    wobei das Gewebe mehrere Lagen (22, 23) von in Maschinenquerrichtung liegenden Fäden (25 bis 30) aufweist und für die in Maschinenquerrichtung liegenden Fäden (25 bis 30) auf der einen Seite und auf der gegenüberliegenden Seite des Gewebes unterschiedliche Materialien verwendet werden.
  6. Papiermaschinengewebe nach einem vorhergehenden Anspruch,
    wobei in Maschinenrichtung liegende, auf einer Seite des Gewebes flottierende Fäden (11, 19, 24, 31) aus Polyester und in Maschinenrichtung liegende, auf der gegenüberliegenden Seite des Gewebes flottierende Fäden (20, 32, 33) aus PPS, PEN oder PEEK hergestellt sind.
  7. Papiermaschinengewebe nach einem vorhergehenden Anspruch,
    wobei die in Maschinenquerrichtung liegenden relativ dicken Fäden (12, 13, 16, 17; 25, 26) und relativ dünnen Fäden (14, 15, 18; 27 bis 30) eine Differenz im Durchmesser von 0,1 mm bis 0,6 mm aufweisen.
  8. Papiermaschinengewebe nach einem vorhergehenden Anspruch,
    wobei die in Maschinenquerrichtung liegenden relativ dicken Fäden (12, 13, 16, 17; 25, 26) und relativ dünnen Fäden (14, 15, 18, 27 bis 30) in jeder einzelnen Lage (22, 23) von in Maschinenquerrichtung liegenden Fäden wechselweise angeordnet sind.
  9. Papiermaschinengewebe nach einem vorhergehenden Anspruch,
    wobei das Gewebe mehr als eine Lage (22, 23) von in Maschinenquerrichtung liegenden Fäden aufweist und die in Maschinenquerrichtung liegenden relativ dicken Fäden (12, 13, 16, 17, 25, 26) und relativ dünnen Fäden (14, 15, 18, 27 bis 30) benachbarter Lagen (22, 23) in vertikaler Richtung abwechselnd angeordnet sind.
  10. Papiermaschinengewebe nach einem vorhergehenden Anspruch,
    wobei das Gewebe außerdem zusätzliche in Maschinenquerrichtung liegende Füllfäden aufweist.
  11. Papiermaschinengewebe nach Anspruch 10,
    wobei die Füllfäden im Querschnitt nicht kreisförmig sind.
  12. Papiermaschinengewebe nach einem vorhergehenden Anspruch,
    wobei die in Maschinenrichtung liegenden Fäden (11, 19, 20; 24, 31 bis 33) im Querschnitt nicht kreisförmig sind.
  13. Papiermaschinengewebe nach Anspruch 12,
    wobei die in Maschinenrichtung liegenden Fäden (11, 19, 20; 24, 31 bis 33) flache Monofilamente sind, deren Verhältnis Breite zu Höhe zwischen 2:1 und 4:1 liegt.
  14. Papiermaschinengewebe nach Anspruch 12,
    wobei die in Maschinenrichtung liegenden Fäden (11, 19, 20, 24, 31 bis 33) eine D-Form aufweisen, deren Krümmung sich in den Körper des Gewebes hinein erstreckt.
  15. Papiermaschinengewebe nach einem vorhergehenden Anspruch,
    wobei das Gewebe unterschiedliche in Maschinenrichtung liegende Fäden (11, 19, 20, 24, 31 bis 33) mit unterschiedlichen Profilgrößen und/oder Profilformen enthält.
  16. Papiermaschinengewebe nach einem vorhergehenden Anspruch,
    wobei das Gewebe eine Trockenpartie-Bespannung ist.
EP95929947A 1994-09-03 1995-08-24 Papiermaschinenbespannung Expired - Lifetime EP0778910B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9417720 1994-09-03
GB9417720A GB9417720D0 (en) 1994-09-03 1994-09-03 Papermakers fabric
PCT/GB1995/002007 WO1996007789A2 (en) 1994-09-03 1995-08-24 Papermakers fabric

Publications (2)

Publication Number Publication Date
EP0778910A2 EP0778910A2 (de) 1997-06-18
EP0778910B1 true EP0778910B1 (de) 1998-11-18

Family

ID=10760765

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95929947A Expired - Lifetime EP0778910B1 (de) 1994-09-03 1995-08-24 Papiermaschinenbespannung

Country Status (13)

Country Link
EP (1) EP0778910B1 (de)
JP (1) JPH10505138A (de)
KR (1) KR100398475B1 (de)
CN (1) CN1069369C (de)
AT (1) ATE173519T1 (de)
AU (1) AU686006B2 (de)
DE (1) DE69506118T2 (de)
ES (1) ES2126928T3 (de)
FI (1) FI108740B (de)
GB (1) GB9417720D0 (de)
PL (1) PL178196B1 (de)
TW (1) TW360724B (de)
WO (1) WO1996007789A2 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5503196A (en) 1994-12-07 1996-04-02 Albany International Corp. Papermakers fabric having a system of machine-direction yarns residing interior of the fabric surfaces
GB9716932D0 (en) * 1997-08-09 1997-10-15 Scapa Group Plc Fabric seam
US6837275B2 (en) * 2002-11-07 2005-01-04 Albany International Corp. Air channel dryer fabric
JP4263201B2 (ja) * 2006-06-30 2009-05-13 シキボウ株式会社 抄紙用ドライヤーカンバス
US7896034B2 (en) * 2009-03-18 2011-03-01 Voith Patent Gmbh Heat- and corrosion-resistant fabric
CN104611978B (zh) * 2015-01-08 2017-05-17 江苏理文造纸有限公司 一种用于材料复合型纸页干网的旋转辊
CN110023564B (zh) * 2016-11-14 2021-12-21 米伦佐恩有限责任两合公司 织物带

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4423755A (en) * 1982-01-22 1984-01-03 Huyck Corporation Papermakers' fabric
SE431236B (sv) * 1982-12-30 1984-01-23 Gusums Bruk Ab Formeringsvira for pappersmaskiner
AT385533B (de) * 1986-08-04 1988-04-11 Hutter & Schrantz Ag Zweilagiges papiermaschinensieb
JP3655301B2 (ja) * 1990-06-06 2005-06-02 アステンジョンソン・インコーポレーテッド 扁平な縦方向モノフィラメントヤーンを備えた製紙用基布

Also Published As

Publication number Publication date
AU3350695A (en) 1996-03-27
WO1996007789A3 (en) 1996-05-30
KR970704934A (ko) 1997-09-06
KR100398475B1 (ko) 2003-12-31
AU686006B2 (en) 1998-01-29
ES2126928T3 (es) 1999-04-01
WO1996007789A2 (en) 1996-03-14
GB9417720D0 (en) 1994-10-19
DE69506118T2 (de) 1999-05-12
FI108740B (fi) 2002-03-15
FI970826A0 (fi) 1997-02-27
ATE173519T1 (de) 1998-12-15
PL178196B1 (pl) 2000-03-31
CN1157017A (zh) 1997-08-13
DE69506118D1 (de) 1998-12-24
FI970826A (fi) 1997-02-27
PL318886A1 (en) 1997-07-07
EP0778910A2 (de) 1997-06-18
CN1069369C (zh) 2001-08-08
TW360724B (en) 1999-06-11
JPH10505138A (ja) 1998-05-19

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