EP1573124B1 - Trockensieb - Google Patents

Trockensieb Download PDF

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Publication number
EP1573124B1
EP1573124B1 EP03811004A EP03811004A EP1573124B1 EP 1573124 B1 EP1573124 B1 EP 1573124B1 EP 03811004 A EP03811004 A EP 03811004A EP 03811004 A EP03811004 A EP 03811004A EP 1573124 B1 EP1573124 B1 EP 1573124B1
Authority
EP
European Patent Office
Prior art keywords
yarns
wire
web
machine
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
EP03811004A
Other languages
English (en)
French (fr)
Other versions
EP1573124A1 (de
Inventor
Rauno Enqvist
Teuvo Ahonen
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.)
Metso Fabrics PMC Oy
Original Assignee
Tamfelt Oyj 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 Oyj AB filed Critical Tamfelt Oyj AB
Publication of EP1573124A1 publication Critical patent/EP1573124A1/de
Application granted granted Critical
Publication of EP1573124B1 publication Critical patent/EP1573124B1/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
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths

Definitions

  • the invention relates to a drying wire which comprises a backside surface and a web-side surface and which is woven of several machine-direction yarns and several cross-machine direction yarns, the yarns being monofilaments and the wire further comprising on the web-side surface several cross-machine direction yarns which differ from the rest of the wire yarns, the wire is a 1.5-layer structure, and the web-side surface is provided, upon weaving, with additional cross-machine direction yarns; which have an easily shapable structure.
  • the drying section of a paper machine utilizes drying wires with which a paper web to be dried is conveyed through the drying section.
  • the fabric structure of the drying wire is formed of high-temperature and moisture resistant yarns by using weaves that are appropriate for the purpose.
  • spun cross-machine direction yarns are arranged, according to the prior art, on the web-side surface.
  • Present smooth-surface drying wires are multilayer structures having a high cross-machine direction yarn density. Manufacturing such drying wires is expensive. The cost of the present wires is further increased because the structures have a lot of expensive spun yarn.
  • such drying wires are relatively thick, which causes draw between the web and the wire.
  • US-A-5 449 548 discloses an industrial fabric including fibers with thin fins, which fill the fabric and reduce the porosity of the fabric.
  • JP-A-3059189 discloses a fabric including yarns coated by synthetic resin.
  • An object of the present invention is to achieve a novel and an improved drying wire.
  • the drying wire according to the invention is characterized in that the additional yarns are arranged to cover the spaces formed between machine-direction yarns on the web-side surface substantially completely, and that the additional yarns are of meltable fibre, which are shaped on the surface of the wire by means of heat treatment.
  • the drying wire is a 1.5-layer structure where the monofilament cross-machine direction yarns are arranged to run on the backside surface of the wire and where there are additional cross-machine direction yarns that differ from the rest of the yarns running on the web side surface of the wire.
  • the additional cross-machine direction yarns are easily shapable, being shaped during the weaving, in a heat treatment and/or during use in such a way that they can become wider in the direction of the wire surface, whereby they fill the spaces between machine-direction yarns on the web-side surface substantially completely.
  • An advantage of the invention is that owing to the shapable additional yarns, the web-side surface of the wire has an extremely large contact area. This is because the additional yarns fill the spaces on the web-side surface of the wire. In addition, the monofilament machine-direction yarns form, relative to the area, a large number of contact points on the web-side surface. Thus, the heat transfers well from the wire to the web, and the drying is efficient. Further, an advantage of the invention is that a 1.5-layer fabric has significantly fewer yarns than a multilayer fabric, and therefore it is less expensive to manufacture. In addition, fewer expensive additional yarns than previously are needed for the structure according to the invention. Yet another advantage is that the wire according to the invention has the desired surface properties immediately after the weaving. Thus, the wire needs not necessarily be ground smooth, calendered or given an intensive shrinking treatment. In this way, the manufacturing may be quicker and the manufacturing costs smaller. Furthermore, no shrinkable or other special yarns need to be used in the basic weave.
  • the starting point for the basic structure is a 3-shed weave, in which case each machine-direction yarn runs in the basic weave over two basic cross-machine direction yarns and further under one basic cross-machine direction yarn.
  • the machine-direction yarn runs over three cross-machine direction yarns and under three cross-machine direction yarns.
  • the essential idea of an embodiment of the invention is that the dimensions of the yarns relative to each other are arranged in such a way that the structure is asymmetric.
  • the additional cross-machine direction yarns running on the web side are of spun yarn.
  • Spun yarn is flexible and shapes up well on the wire surface both during weaving and when it is subjected to pressing forces during use. Due to the effect of pressing forces, the structure of spun yarns can expand in the direction of the wire surface.
  • the contact area of the wire surface may be extremely large, up to nearly 100%, depending on the pressing force. Despite the large contact area, the number of contact points is also large.
  • the essential idea of an embodiment of the invention is that the proportion of the additional yarns on the web-side surface is less than 60% of the area.
  • the wire is less expensive to manufacture.
  • the wire remains clean for a long time.
  • the essential idea of an embodiment of the invention is that the proportion of the additional yarns is preferably between 30 and 60%.
  • the cross-machine direction yarns of the backside surface of the wire are flat monofilaments.
  • Flat yarns support the wire structure in the direction of its surface.
  • the surface of the backside surface may be smoother when flat yarns are used, compared with the use of round yarns, and therefore the wire carries less air with it.
  • the wire has good aerodynamic properties and good runnability in a paper machine.
  • the thickness of the wire is less than 1.5 mm. Owing to the wire being thin and having an asymmetric structure, the draw between the wire and the web in a paper machine can be small. Thus, detrimental stretching of the web and/or wearing of the wire can be avoided.
  • the essential idea of an embodiment of the invention is that the contact area of the monofilaments on the web side in the wire is 40% or more, and at the same time, the number of contact points of the monofilaments is 30 points/cm 2 or more.
  • Such a wire has a good heat transfer capacity.
  • the additional yarns are hydrophilic.
  • the web-side surface of the wire is appropriately hydrophilic and smooth, the web is well pressed adhered to the wire surface, owing to which the runnability of the wire is good.
  • Figure 1 shows a cross-section of a wire according to the invention.
  • the wire comprises a backside surface A which is against the paper machine and a web-side surface B which is against the web to be dried.
  • the wire is run in the running direction MD of the paper machine. Further, the cross-direction of the paper machine is indicated in the figure as CMD.
  • the wire is a 1.5-layer structure formed by weaving from machine-direction yarns 1 and cross-machine direction yarns 2.
  • the weave has a 3-shed structure.
  • the machine-direction yarns 1 run over two cross-machine direction yarns 2 and further under one cross-machine direction yarn 2, continuing then according to the same pattern. All machine-direction yarns 1 in the fabric run according to the same weave pattern.
  • adjacent machine-direction yarns 1 always have a shift of one cross-machine direction yarn in the same direction or in a different direction.
  • the web-side surface B is provided, upon weaving with additional cross-machine direction yarns 3, which may be of spun yarn.
  • Spun yarn shapes up well in the space between machine-direction yarns 1 on the surface of the wire.
  • the material of spun yarns may be, for instance, polyacrylonitrile (PAN) and/or aramid.
  • the additional yarns 3 are of meltable fibre, the heat treatment after weaving causing the additional yarns 3 to shape up on the surface of the wire.
  • suitable twisted yarn, multifilament and/or multi-component yarn may be used as additional yarns 3.
  • additional yarns 3 are relatively easily shapable yarns which shape up due to weaving forces and/or pressing forces during the use of the paper machine in such a way that they fill the spaces between machine-direction yarns 1 on the web-side surface substantially completely, whereby a large contact area is achieved.
  • the original cross-section of the additional yarns 3 may be flat or round.
  • the machine-direction yarns 1 may be monofilaments and their material may be polyethylene terephthalate (PET), polyamide (PA), polyphenylene sulphide (PPS), polyether ether ketone (PEEK), polycyclohexylenedimethylene terephthalate (PCTA) or polyethylene naphthalene (PEN).
  • PET polyethylene terephthalate
  • PA polyamide
  • PPS polyphenylene sulphide
  • PEEK polyether ether ketone
  • PCTA polycyclohexylenedimethylene terephthalate
  • PEN polyethylene naphthalene
  • the cross-section of the machine-direction yarns 1 may be flat, in which case a large contact surface is achieved.
  • the cross-machine direction yarns 2 running on the backside surface A of the wire may also have a flat cross-section.
  • the cross-section of flat yarns may be oval or rectangular with rounded edges.
  • Flat yarns are, as known, rigid in one
  • the wire may be thin. In empirical tests it has been observed that preferably the thickness of the wire is less than 1.5 mm, particularly preferably less than 1.3 mm. Further, it has been observed that the air permeance of the wire may be even less than 1 000 m 3 /m 2 h. However, the air permeance is preferably in the range of 1 000 to 3 000 m 3 /m 2 h.
  • Figure 2 shows the web-side surface of the drying wire according to the invention. Between machine-direction yarns 1, there are empty spaces 4, which are filled by additional yarns 3. Since the additional yarns 3 are easily shapable, they fill the empty spaces 4 substantially completely. As seen from the figure, the wire surface has a large contact area. On the other hand, the machine-direction yarns 1 form a large number of contact points on the web-side surface.
  • the proportion of additional yarns on the web-side surface is too high, the wire surface may become too hydrophilic. If the wire surface is too wet, dirt sticks easily to it and the wire may be clogged prematurely. In addition, the wire surface is rougher, which also contributes to the sticking of dirt. In the invention, the proportion of additional yarns on the surface is less than 60% of the area, and no such problems have been observed.
  • drying wire according to the invention may, in some cases, have a two-shed, four-shed or six-shed structure.

Landscapes

  • Woven Fabrics (AREA)
  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
  • Amplifiers (AREA)

Claims (10)

  1. Ein Trockensieb, das umfasst eine Rückseiteoberfläche (A) und eine Gewebeseiteoberfläche (B) und das gewoben ist aus mehreren Garnen (MD) (1) in Maschinenrichtung und mehreren Garnen (CMD) (2), die in Querrichtung zur Maschinenrichtung liegen, wobei die Garne (1, 2) Monofilamente sind und das Sieb weiter auf der Gewebeseitenoberfläche (B) mehrerer Garne in Querrichtung der Maschinenrichtung umfasst, die sich von dem Rest der Siebgarne unterscheiden, das Sieb eine 1,5-Lagenstruktur ausweist und die Gewebeseiteoberfläche (B) beim Weben mit zusätzlichen quer zur Maschinenrichtung liegenden Garnen versehen wird, die eine leicht formbare Struktur haben, dadurch gekennzeichnet, dass die zusätzlichen Garne (3) so angeordnet sind, dass sie die Zwischenräume (4), die zwischen den in der Maschinenrichtung liegenden Garnen (1) auf der Gewebeseiteoberfläche (B) gebildet- sind, vollständig abdecken und dass die zusätzlichen Garne (3) aus schmelzbaren Fasern bestehen, die auf der Oberfläche des Siebs mittels Wärmebehandlung geformt sind.
  2. Trockensieb nach Anspruch 1, dadurch gekennzeichnet, dass die Garne (1), welche in Maschinenrichtung liegen, im Basisgewebe so angeordnet sind, dass sie über zwei Garnen (2), welche quer zur Maschinenrichtung liegen, und unter einem Garn (2), das in Querrichtung zur Maschinenrichtung liegt, angeordnet sind, und zwar so, dass sie kontinuierlich das gleiche Muster bilden.
  3. Trockensieb nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Dimensionen der Garne relativ zueinander so angeordnet sind, dass die Struktur des Trockensiebs asymmetrisch ist.
  4. Trockensieb nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Garne (1), welche in Maschinenrichtung liegen, flache Monofilamente sind, und dass die Garne (2), welche quer zur Maschinenrichtung, auf der Rückseite der Oberfläche liegen, flache Monofilamente sind.
  5. Trockensieb nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, das der Anteil der zusätzlichen Garne (3) auf der gewebeseitigen Oberfläche (B) weniger als 60 % der gesamten Fläche beträgt.
  6. Trockensieb gemäß einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Anteil der zusätzlichen Garne (3) auf der gewebeseitigen Oberfläche (B) zwischen 30 und 60 % ist.
  7. Trockensieb nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Dicke des Siebes weniger als 1,5 mm ist.
  8. Trockensieb nach mindestens einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Dicke des Siebes weniger als 1,3 mm ist.
  9. Trockensieb nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zusätzlichen Garne (3) hydrophil sind.
  10. Trockensieb entsprechend mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Garne (1), welche in Maschinenrichtung liegen, Monofilamente sind;
    dass die Berührungsfläche der Monofilamente in der gewebeseitigen Oberfläche (B) des Siebs 40% oder mehr ist und
    dass gleichzeitig die Anzahl der Kontaktpunkte der Monofilamente auf der gewebeseitigen Oberfläche (B) 30 Punkte/cm2 oder mehr ist.
EP03811004A 2002-11-12 2003-11-11 Trockensieb Expired - Lifetime EP1573124B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20022018 2002-11-12
FI20022018A FI112514B (fi) 2002-11-12 2002-11-12 Kuivatusviira
PCT/FI2003/000854 WO2004044313A1 (en) 2002-11-12 2003-11-11 Drying wire

Publications (2)

Publication Number Publication Date
EP1573124A1 EP1573124A1 (de) 2005-09-14
EP1573124B1 true EP1573124B1 (de) 2007-09-26

Family

ID=8564927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03811004A Expired - Lifetime EP1573124B1 (de) 2002-11-12 2003-11-11 Trockensieb

Country Status (7)

Country Link
EP (1) EP1573124B1 (de)
AT (1) ATE374284T1 (de)
AU (1) AU2003276320A1 (de)
DE (1) DE60316598T2 (de)
ES (1) ES2291748T3 (de)
FI (1) FI112514B (de)
WO (1) WO2004044313A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI116911B (fi) * 2004-08-04 2006-03-31 Tamfelt Oyj Abp Kuivatusviira
DE102007041412B3 (de) * 2007-08-31 2009-03-05 Klaus Bloch Filtergewebe für ein Brauereimaischefilter
DE202015103812U1 (de) * 2015-07-20 2015-08-12 Heimbach Gmbh & Co. Kg Trockensieb, damit ausgestattete Trockenpartie einer Papiermaschine sowie Verwendung des Trockensiebes in dieser Trockenpartie

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI832191L (fi) * 1982-09-30 1984-03-31 Huyck Corp Pappermaskinstyg, som har oeppna maskor utformande traodar
JP2696253B2 (ja) * 1989-07-20 1998-01-14 大和紡績株式会社 抄紙用ドライヤーカンバス
US5449548A (en) * 1994-11-28 1995-09-12 Bowen, Jr.; David Table, reduced permeability papermaker's fabrics containing fibers with fins designed to distort at lower force levels by having a reduced cross sectional area within the fin

Also Published As

Publication number Publication date
AU2003276320A1 (en) 2004-06-03
FI20022018A0 (fi) 2002-11-12
ATE374284T1 (de) 2007-10-15
ES2291748T3 (es) 2008-03-01
EP1573124A1 (de) 2005-09-14
DE60316598D1 (de) 2007-11-08
WO2004044313A1 (en) 2004-05-27
DE60316598T2 (de) 2008-07-03
FI112514B (fi) 2003-12-15

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