WO2004072368A1 - Ruban de toile - Google Patents

Ruban de toile Download PDF

Info

Publication number
WO2004072368A1
WO2004072368A1 PCT/AT2004/000009 AT2004000009W WO2004072368A1 WO 2004072368 A1 WO2004072368 A1 WO 2004072368A1 AT 2004000009 W AT2004000009 W AT 2004000009W WO 2004072368 A1 WO2004072368 A1 WO 2004072368A1
Authority
WO
WIPO (PCT)
Prior art keywords
threads
elastic
tape according
fabric tape
fabric
Prior art date
Application number
PCT/AT2004/000009
Other languages
German (de)
English (en)
Inventor
Harald Reiterer
Raphael Gruber
Klaus Haiden
Original Assignee
Huyck Austria Ges.M.B.H.
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 Huyck Austria Ges.M.B.H. filed Critical Huyck Austria Ges.M.B.H.
Publication of WO2004072368A1 publication Critical patent/WO2004072368A1/fr

Links

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

  • the invention relates to a fabric tape for drainage machines, consisting of a base fabric made of longitudinal and transverse threads.
  • Such fabric belts are used, for example, as sieve belts, as are described in the applicant's EP 0 864 775 A1.
  • these fabric tapes are used in drainage technology, in particular for pulp dewatering machines or very generally for sludge dewatering.
  • water is dewatered in most cases, the term “dewatering” should not be interpreted restrictively, since other liquids can also be the subject of "dewatering”.
  • Fabric belts in the form of such sieve belts and dewatering or press felts are mainly used in continuously running pulp drainage systems and paper machines.
  • the main task of these felts is to absorb water that escapes from the pulp or paper web during a pressing process.
  • This pressing process takes place in a gap, the so-called (press) nip, which is created by pressing two or more pairs of rollers together or a roller and a press shoe.
  • These systems can be single or double felted, i.e. H. the pulp or paper web either runs between two felts (top and bottom felt) or between a felt and a roller in the press nip and is compressed and pressed out there. The pressed water is absorbed by the felts and later released on a suction device.
  • An object of the invention is to provide a fabric tape with which effective dewatering while reducing the rewetting effect is possible. This object is achieved with a fabric tape mentioned at the outset in that, according to the invention, it contains highly elastic transverse and / or longitudinal threads which are at least partially formed from an elastic material.
  • the amount of water squeezed out and absorbed by the felt is, in addition to many other influences, very much influenced by the felt itself, its structure and construction, and represents a decisive criterion for the efficiency of the pulp or paper drainage system.
  • highly elastic components in the base fabric of the Felts result in an elastic-dynamic behavior of the felt construction during the pressing and relief process, which has a positive influence on the dewatering of the cellulose or paper web.
  • the elastic components result in a stronger compacting of the felt in the press ip, an increase in the contact area in the press nip (wider nip) and an increase in the drainage speed due to the lower internal volume and reduction of the open pores in the base fabric during the press phase.
  • the recovery of the elastic components creates a vacuum on the product side, which causes an additional suction effect of the felts and thus an improvement in the drainage performance when leaving the press nip.
  • these elastic components in the felt cause pressure and vibration damping properties which have a positive influence on the running behavior of the felt, especially at high line speeds.
  • the elastic material is a thermoplastic elastomer.
  • the elastic threads can also consist of a mixture of the elastic material with non-elastic materials, whereby the strength of the fabric can be increased and the elastic threads themselves also become absorbent.
  • the fabric tape can be produced easily if the longitudinal and / or transverse threads are monofilaments and / or monofilament threads. Easy processing in terms of weaving technology is ensured if the elastic threads have a round cross section.
  • the diameter of the elastic threads is typically between 0.2 m and 0.9 mm.
  • the non-elastic threads are made of polyamide.
  • At least one layer of longitudinal threads is formed in the fabric from elastic threads.
  • the elasticity can be increased if two layers of elastic cross threads are separated by a layer of non-elastic cross threads.
  • the fabric band is needled with hydrophilic fibers and points in the area of its product side Surface at least a hydrophobic fine fiber layer.
  • the water from the cell web is pressed through the hydrophobic fiber layer into the fabric band at the comparatively high pressures in the press nip, where it is absorbed. After leaving the press nip, the water then "flows back" out of the felt prevented by the water-repellent fiber layer or at least reduced, since the pressures in the felt are not high enough to push the water through the fine fiber layer again in large quantities.
  • a firm, mechanically stable connection results when the hydrophobic fine fiber layer is needled to the base fabric / hydrophilic fibers.
  • the hydrophobic fibers are made of polypropylene. It is particularly advantageous if the fine fiber layer is a fiber fabric.
  • a non-woven fabric is required for an even fiber layer in the felt and results in a homogeneous felt structure.
  • an anti-rewetting barrier made of non-woven fabric basically does not represent a foreign body in the felt and can be produced using existing needle technology.
  • the hydrophobic fine fiber layer is arranged directly on the surface or immediately below one or a few product-side layers of hydrophilic fibers. This ensures that the fine fiber layer is as close as possible to the cellulose web. In addition, a lot of free felt volume is available for water storage under the fine fiber layer, and such a cover with a polyamide fiber layer also protects the fine fiber layer from mechanical wear.
  • hydrophilic fibers consist of polyamide.
  • FIG. 1 shows a fabric tape according to the invention with the cellulose web placed thereon in the unloaded state
  • FIG. 2 shows the fabric tape according to the invention with the cellulose web from FIG. 1 placed thereon in the loaded state
  • FIG. 3 shows the fabric tape according to the invention with the cellulose web according to FIG. 1 placed on it in a relaxed state
  • FIG. 5 shows the fabric tape according to the invention with the cellulose web from FIG. 5 placed on it in the loaded state
  • 6 shows the fabric tape according to the invention with the cellulose web placed thereon according to FIG. 4 in a relaxed state
  • FIG. 8 shows the fabric tape according to the invention with the cellulose web from FIG. 7 placed thereon in the loaded state
  • FIG. 9 shows the fabric tape according to the invention with the cellulose web from FIG. 7 in a relaxing state
  • FIG. 10 shows the fabric tape according to the invention with the cellulose web placed thereon according to FIG. 7 in the unloaded state.
  • Fig. 1 shows a cross section of a felt (needled fabric tape) according to the invention, which can be used in dewatering machines.
  • a felt needleled fabric tape
  • an upper, endless and a lower, endless felt circulate in a dewatering machine, with a layer of the mass to be dewatered (cellulose) being located between the upper and lower felt.
  • This three-layer structure namely upper sieve belt - pulp - lower sieve belt, runs on the dewatering machine in the viewing direction, i.e. H. towards normal in the drawing, through the gap of one or more pairs of rollers.
  • the sieve belt consists of a basic fabric, which like every fabric has weft and warp threads.
  • the screen belt 100 shown consists of a fabric belt 101, which is composed of a base fabric, which is formed from transverse threads 1 and as weft threads from longitudinal threads 2, 3, 4.
  • This base fabric is needled with fine fibers 102, which are preferably made of polyamide or a similar water-absorbing material. Furthermore, such fine fibers are still connected to this base fabric 101 on the side facing the product 200 to be dewatered in the form of a non-woven fabric 103.
  • the transverse threads 1 consist of polyamide monofilaments or polyamide threads, whereby mixtures of monofilaments and threads can also form the base fabric.
  • longitudinal threads 2, 4 are now also formed from such polyamide threads, as shown from a 6-ply thread.
  • monofilaments or other threads can also be used here.
  • the base fabric as can be seen in the drawing, now contains threads 3 which are at least partially formed from an elastic material. It is particularly advantageous if this elastic material is a thermoplastic elastomer which has highly elastic properties and is therefore particularly suitable for the invention.
  • the elastic threads 3 in the transverse direction are elastic.
  • the middle layer of longitudinal threads 3 in the 3-layer base fabric consists of such elastic threads.
  • these are elastic monofilaments, for example made of a thermoplastic elastomer.
  • threads can also be used that either contain elastic components (for example a 6-fold thread made of 2 elastomer and 4 polyamide threads), or are made entirely of elastomer (for example a 4-fold Thread made of 4 elastomer threads).
  • the entire middle layer consists of such elastic threads 3.
  • the other threads of the layer are not elastic.
  • only the uppermost, product-side layer of longitudinal threads is formed from elastic threads.
  • the arrangement of the elastic threads ie which of the threads is elastic, can be selected relatively freely depending on the field of application, the contact pressures used, etc. It is also conceivable that the entire base fabric is formed from such elastic threads. It can also be provided that only transverse threads or also longitudinal and transverse threads are formed from elastic threads. As a rule, however, sieve belts with a relatively high tensile force are applied in the dewatering machines.
  • an arrangement as in the drawing, in which non-elastic threads are also provided in the fabric is advantageous, since these non-elastic threads can absorb the tensile forces and so on there is no undesired deformation of the fabric tape in the direction of the tensile forces.
  • non-elastic transverse and longitudinal threads 1, 2, 4 of the screen belt are made of polyamide, for example, as already mentioned, but also polyester or mixtures of these materials, and can be monofilaments or threads.
  • the elastic threads in the fabric are achieved so that during the pressing process, as is shown schematically in FIG. 2, the felt is more compacted, i. H. the felt is compressed more, and there is an increase (broadening) of the contact area of the felt with the cellulose web. Furthermore, the open areas or pores of the base fabric 101 are reduced in size, which leads to a reduction in the inner volume of the felt 201 fabric. These effects mean that the drainage rate is increased, which means that the cell web is better drained.
  • the elastic components in the felt give it pressure and vibration damping properties, which gives the felt better running behavior, especially at high running speeds of the drainage system.
  • the elastic threads have a round cross section, the diameter is generally between 0.2 mm and 0.9 mm.
  • the non-elastic threads have diameters of, for example, 0.5 or 1.5 mm; in the case of a twisted thread, the dimensions are also in this range, the individual monofilaments of the threads typically having a diameter of 0.1 to 0 , 4 mm.
  • cross sections other than circular are also possible, although the circular shape enables simple processing in terms of weaving technology.
  • FIGS. 4-6 show a further embodiment, as already briefly mentioned above, in which the uppermost, product-side layer of longitudinal threads consists of elastic threads 3 ', while the layers below contain threads 2', 4 'made of a non-elastic material ,
  • An advantage of this embodiment consists in a possible intensification of the “suction effect”, since the relaxation of the elastic monofilaments and thus the vacuum that occurs are closer to the cellulose web.
  • FIGS. 7-10 also show a fabric tape similar to that from FIG. 1, the fabric tape additionally having at least one hydrophobic fine fiber layer 104 in the area of its surface on the product side, this preferably extending over the extent of the total surface extension.
  • a firm, mechanically stable connection results when the hydrophobic fine fiber layer is needled to the base fabric / hydrophilic fibers.
  • the fine fiber layer is a non-woven fabric.
  • a non-woven fabric is required for an even fiber layer in the felt and results in a homogeneous felt structure.
  • an anti-rewetting barrier made of non-woven fabric basically does not represent a foreign body in the felt and can be produced using existing needle technology.
  • the hydrophobic fine fiber layer is arranged directly on the product-side surface or immediately below one or a few product-side layers of hydrophilic fibers. This ensures that the fine fiber layer is as close as possible to the cellulose web. In addition, a lot of free felt volume is available for water storage under the fine fiber layer, and such a cover with a polyamide fiber layer also protects the fine fiber layer from mechanical wear.
  • hydrophilic fibers consist of polyamide.

Landscapes

  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Woven Fabrics (AREA)

Abstract

L'invention concerne un ruban de toile destiné à des machines d'égouttage et constitué d'un tissu de base à fils longitudinaux (2, 3, 4) et transversaux (1). Le ruban de toile selon l'invention contient des fils transversaux et/ou longitudinaux élastiques qui sont formés au moins partiellement à partir d'un matériau élastique.
PCT/AT2004/000009 2003-02-12 2004-01-15 Ruban de toile WO2004072368A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA215/2003 2003-02-12
AT2152003 2003-02-12

Publications (1)

Publication Number Publication Date
WO2004072368A1 true WO2004072368A1 (fr) 2004-08-26

Family

ID=32854881

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT2004/000009 WO2004072368A1 (fr) 2003-02-12 2004-01-15 Ruban de toile

Country Status (1)

Country Link
WO (1) WO2004072368A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007027909A2 (fr) 2005-09-02 2007-03-08 Albany International Corp. Courroie aiguilletee presentant une epaisseur et une elasticite elevees
WO2007079029A2 (fr) * 2005-12-29 2007-07-12 Albany International Corp. Courroie en caoutchouc de silicone elastique
WO2010141319A1 (fr) 2009-06-05 2010-12-09 Albany International Corp. Tissu ultra-résilient
WO2012100161A1 (fr) 2011-01-21 2012-07-26 Albany International Corp. Tissu ultra-résilient et son procédé de fabrication
CN101960063B (zh) * 2007-12-28 2013-06-19 阿尔巴尼国际公司 可压缩的回弹性工业织物
US9352530B2 (en) 2013-03-15 2016-05-31 Albany International Corp. Industrial fabric comprising an extruded mesh and method of making thereof
US9545773B2 (en) 2013-03-15 2017-01-17 Albany International Corp. Pad comprising an extruded mesh and method of making thereof
US10588375B2 (en) 2007-12-28 2020-03-17 Albany International Corp. Ultra-resilient pad
US10590571B2 (en) 2007-12-28 2020-03-17 Albany International Corp. Ultra-resilient pad
WO2021244779A1 (fr) * 2020-06-02 2021-12-09 Voith Patent Gmbh Bande élastique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1455843A (en) * 1973-01-31 1976-11-17 Scapa Porritt Ltd Paper makers wet felts
US4323622A (en) * 1977-11-21 1982-04-06 Albany International Corp. High-elasticity press felt
US5508094A (en) * 1991-12-18 1996-04-16 Albany International Corp. Press fabrics for paper machines
GB2332916A (en) * 1997-12-31 1999-07-07 Scapa Group Plc Papermaking press felt with elastomer fibre layer
EP1167622A1 (fr) * 2000-06-19 2002-01-02 Ichikawa Co.,Ltd. Feutre pour papeterie

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1455843A (en) * 1973-01-31 1976-11-17 Scapa Porritt Ltd Paper makers wet felts
US4323622A (en) * 1977-11-21 1982-04-06 Albany International Corp. High-elasticity press felt
US5508094A (en) * 1991-12-18 1996-04-16 Albany International Corp. Press fabrics for paper machines
GB2332916A (en) * 1997-12-31 1999-07-07 Scapa Group Plc Papermaking press felt with elastomer fibre layer
EP1167622A1 (fr) * 2000-06-19 2002-01-02 Ichikawa Co.,Ltd. Feutre pour papeterie

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007027909A3 (fr) * 2005-09-02 2007-06-07 Albany Int Corp Courroie aiguilletee presentant une epaisseur et une elasticite elevees
WO2007027909A2 (fr) 2005-09-02 2007-03-08 Albany International Corp. Courroie aiguilletee presentant une epaisseur et une elasticite elevees
WO2007079029A2 (fr) * 2005-12-29 2007-07-12 Albany International Corp. Courroie en caoutchouc de silicone elastique
WO2007079029A3 (fr) * 2005-12-29 2007-08-23 Albany Int Corp Courroie en caoutchouc de silicone elastique
US9222208B2 (en) 2005-12-29 2015-12-29 Albany International Corp. Elastic silicone rubber belt
US10588375B2 (en) 2007-12-28 2020-03-17 Albany International Corp. Ultra-resilient pad
CN101960063B (zh) * 2007-12-28 2013-06-19 阿尔巴尼国际公司 可压缩的回弹性工业织物
US10590571B2 (en) 2007-12-28 2020-03-17 Albany International Corp. Ultra-resilient pad
US10590568B2 (en) 2007-12-28 2020-03-17 Albany International Corp. Ultra-resilient fabric
US10590569B2 (en) 2007-12-28 2020-03-17 Albany International Corp. Ultra-resilient fabric
WO2010141319A1 (fr) 2009-06-05 2010-12-09 Albany International Corp. Tissu ultra-résilient
WO2012100161A1 (fr) 2011-01-21 2012-07-26 Albany International Corp. Tissu ultra-résilient et son procédé de fabrication
EP2993263A1 (fr) 2011-01-21 2016-03-09 Albany International Corp. Tissu ultra-élastique
US8535484B2 (en) 2011-01-21 2013-09-17 Albany International Corp. Ultra-resilient fabric and method of making thereof
KR101845272B1 (ko) 2013-03-15 2018-04-04 알바니 인터내셔널 코포레이션 압출 메시를 포함하는 산업용 포 및 이의 제조 방법
US10041210B2 (en) 2013-03-15 2018-08-07 Albany International Corp. Industrial fabric comprising an extruded mesh and method of making thereof
US10173391B2 (en) 2013-03-15 2019-01-08 Albany International Corp. Pad comprising an extruded mesh and method of making thereof
US9545773B2 (en) 2013-03-15 2017-01-17 Albany International Corp. Pad comprising an extruded mesh and method of making thereof
US9352530B2 (en) 2013-03-15 2016-05-31 Albany International Corp. Industrial fabric comprising an extruded mesh and method of making thereof
US10786970B2 (en) 2013-03-15 2020-09-29 Albany International Corp. Pad comprising an extruded mesh and method of making thereof
US10934663B2 (en) 2013-03-15 2021-03-02 Albany International Corp. Industrial fabric comprising an extruded mesh and method of making thereof
WO2021244779A1 (fr) * 2020-06-02 2021-12-09 Voith Patent Gmbh Bande élastique

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