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WO1998019860A1 - Garnitures de machine a papier fabriquees en ptfe expanse - Google Patents

Garnitures de machine a papier fabriquees en ptfe expanse Download PDF

Info

Publication number
WO1998019860A1
WO1998019860A1 PCT/US1997/019725 US9719725W WO9819860A1 WO 1998019860 A1 WO1998019860 A1 WO 1998019860A1 US 9719725 W US9719725 W US 9719725W WO 9819860 A1 WO9819860 A1 WO 9819860A1
Authority
WO
WIPO (PCT)
Prior art keywords
expanded ptfe
machine
article
paper
filaments
Prior art date
Application number
PCT/US1997/019725
Other languages
English (en)
Inventor
John M. Hawes
Terry J. Kaminski
Original Assignee
Albany International Corp.
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 Albany International Corp. filed Critical Albany International Corp.
Priority to AU50050/97A priority Critical patent/AU5005097A/en
Priority to BR9706907A priority patent/BR9706907A/pt
Priority to JP10521562A priority patent/JPH11512157A/ja
Priority to NZ330820A priority patent/NZ330820A/xx
Priority to EP97912995A priority patent/EP0996540A4/fr
Publication of WO1998019860A1 publication Critical patent/WO1998019860A1/fr
Priority to NO983031A priority patent/NO983031L/no

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • 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

Definitions

  • This invention relates to paper machine clothing suitable for use in the forming, pressing or drying sections of a paper making machine. More particularly, it relates to such fabrics made from monofilaments of synthetic polymer resins, specifically expanded PTFE.
  • the modern papermaking machine is in essence a device for removing water from the paper furnish, which is a slurry of papermaking constituents.
  • the water is removed sequentially in three stages or sections of the machine.
  • the first section also known as the forming section
  • the furnish is deposited on a moving forming wire and water is drained through the wire to leave a paper sheet or web having a solids content of about 18 to 25 percent by weight .
  • the formed web is carried into a wet press felt section and passed through one or more nip presses on a moving press felt to remove sufficient water to form a sheet having a solids content of 36 to 50 percent by weight.
  • endless belts are employed in the various sections to carry the sheet or web of paper.
  • endless belts there are a wide variety of forms of the endless belts, some fabricated from metal and others from textile material such as cotton, cotton and asbestos, asbestos and synthetic fibrous or filamentous materials. The selection of a given material is dependent to some degree upon the use to which the fabric will be put, i.e., as a forming fabric, dryer felt, etc.
  • One form of belt which has been used extensively as a forming wire in the forming section of the papermaking machine is one fabricated from an open weave of synthetic, polymeric resin monofilaments .
  • Such fabrics generally perform well in the forming section although there are certain limitations.
  • the relatively open weaves particularly when run at highest speeds, lack dimensional stability. This shortens the overall life of the forming wire which is subject to abrasion as it shifts in position on the machine.
  • the relatively open weaves are less than fully supportive of the furnish fibers deposited on the wire.
  • the fiber and sheet supporting properties of a wire should be increased without significant decrease of water removal through drainage .
  • Press fabrics operate in the press section of the paper making machine.
  • the paper sheet is transported by the press fabric and the sheet and fabric are pressed between the nip of the press rolls, which exerts enormous pressure on the sheet and fabric, thereby dewatering the sheet by pressing out the liquid.
  • temperatures in this section of the machine are relatively high.
  • the press fabric generally consists of a base layer and a batt layer of staple fibers needled to the base. Synthetic materials have become the norm, with polyamide being a particularly favored material.
  • Dryer fabrics or "dryer screens" employed in the paper making industry have, traditionally, been formed from a variety of materials such as poly (ethylene terephthalate) , polyphenylene sulfide and polypropylene. Each material has different properties and pricing.
  • An important property for any material used as a dryer screen in a paper making machine is that the material should have good hydrolytic stability and good dimensional stability.
  • Polypropylene is the cheapest material presently available; it has excellent hydrolytic stability, but poor dimensional stability at elevated temperature, and as a result it has only limited use.
  • Poly (ethylene terephthalate) PET is moderately priced, has exceptional dimensional stability and reasonable hydrolytic stability.
  • Poly (ethylene terephthalate) is the predominant material currently used in the market place and in most cases, the hydrolytic stability of poly (ethylene terephthalate) can be improved by the addition of carbodiimide stabilizers.
  • Polyphenylene sulfide has excellent dimensional and hydrolytic stability, but is extremely high priced, is more difficult to work, and tends to suffer from brittle fracture problems in the crystalline state due to normal flexing experienced on the paper machine.
  • the present invention is an article of paper making machine clothing suitable for use in the forming, pressing or drying sections of a paper making machine wherein the article is comprised of a fibre structure constructed of yarns of expanded poly (tetrafluoro ethylene) ("expanded PTFE").
  • Expanded PTFE is a material available from W.L. Gore and Associates, Inc., Newark DE, USA. As described in U.S. Patent No. 3,953,566, expanded PTFE is a highly porous material characterized by a microstructure of nodes interconnected by fibrils. The disclosure of the '566 patent is incorporated herein by reference. The material, in addition to its high porosity, exhibits high tensile strength.
  • Figure 1 shows the results of an abrasion test performed on the preferred embodiment .
  • Figures 2a-2d show SEM's of the filament used in the preferred embodiment.
  • Figures 3a-3b show the degree of abrasion for the prior art .
  • Figures 4a-4b show the degree of abrasion for the preferred embodiment.
  • Figures 5a-5b show the degree of abrasion for the prior art .
  • Figures 6a-6b show the degree of abrasion for the preferred embodiment .
  • paper machine clothings comprised of expanded PTFE filaments provide industrial fabrics that exhibit excellent abrasion resistance, contamination resistance, and crease resistance.
  • Tensile properties of expanded PTFE woven goods equal or exceed that of currently available polyesters or polyamides .
  • the enhanced tensile properties relative to these other materials are believed to improve the dimensional stability of the fabrics.
  • the use of expanded PTFE monofilaments allows higher use temperatures, up to 288°C, than temperatures at which conventional materials could be used.
  • Forming wires constructed according to the invention may be fabricated from an all monofilament fabric which provide an exceptionally smooth surface to contact the paper sheet. A maximum degree of support is achieved. As a result, relatively mark free paper product is obtained, while the desired advantages of an all monofilament fabric are retained, such as an efficient degree of water drainage.
  • the structure of the fabrics and the wires of the invention is such that a greater dimensional stability is achieved in both the machine and cross- machine directions. This reduces yarn abrasion and increases operating life. The overall operating life of the forming fabric is significantly increased over prior art fabric .
  • paper machine clothing in accordance with the present invention is its potential use in high temperature sections of a paper making machine, in particular dryer fabrics and dryer screen fabrics, since the material from which it is made is not readily hydrolyzed. That is, it exhibits good resistance to hydrolysis.
  • PTFE is known to be a highly inert, water repellant material.
  • paper machine clothings constructed of expanded PTFE can be used in all sections of the paper making machine.
  • the forming section it is possible to form an open weave using monofilament materials which allow for adequate support of the solid materials in the furnish and yet allow sufficient dewatering to produce a coherent sheet preparatory to pressing.
  • the pressing section by providing both the support layer and at least a portion of the surface layer of the pressing fabric in accordance with the present invention, pressing fabrics much more tolerant of high temperature operation are produced.
  • the invention is concerned not only with the production of paper machine clothing (PMC) materials which may be of woven or spiral or of other suitable monofilament structures, in which monofilaments may extend in both the machine direction and the cross direction of the fabric, but also include other PMC structures .
  • PMC paper machine clothing
  • Such material may be used to produce PMC fabrics comprised of staple, multifilament, and/or monofilament fibres.
  • Typical range of sizes of monofilaments used in press fabrics and dryer fabrics are 0.20 mm - 1.27 mm in diameter or the equivalent mass in cross- section in other cross-section shapes, e.g. square or oval .
  • Industrial applications may use monofilaments up to 3.8 m .
  • Filaments of expanded PTFE can be formed by helically winding expanded PTFE sheet material. See U.S. Patent No. 5,281,475, the disclosure of which is incorporated herein by reference.
  • Filaments are woven into paper machine belts according to conventional weaving techniques.
  • the type of weave and density thereof will depend on the type of paper and papermaking operation for which the belt is to be used.
  • Single layer and multilayered constructions are suitable, and when formed of a woven construction, the fabrics may be woven endless or in flat form. The following examples demonstrate the advantages of the present invention.
  • a woven single layer fabric was constructed of expanded PTFE monofilaments (obtained from W.L. Gore & Associates) as the shute yarns and Hoescht 906Y polyethylene terephthalate material as the warp yarns.
  • the woven fabric was a 62 x 46 five harness single layer straight twill fabric woven with 0.30 mm monofilament shute in a 2x3 configuration.
  • a woven fabric containing 0.30 mm Hoescht 906Y HMW PET monofilament as warp and shute was prepared in the same configuration as the expanded PTFE containing fabric.
  • the coefficient of friction of the woven samples was calculated from the force needed to drag a steel plate over the samples, with the test being performed in the machine direction. The friction values obtained were 50% lower for the expanded PTFE material on both the short and long warp knuckle sides. It was observed that the expanded PTFE samples felt very slippery. Friction Values
  • the fabric samples described above were tested for abrasion resistance.
  • the samples were tested with the long shute knuckle down to maximize the exposure of the expanded PTFE to the wear cylinder.
  • a force transducer was used to measure the force exerted on the fabric during the test .

Landscapes

  • Paper (AREA)
  • Woven Fabrics (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Artificial Filaments (AREA)

Abstract

La présente invention se rapporte à un élément de garniture de machine à papier utilisable dans les sections de formage, de pressage et de séchage d'une machine de fabrication du papier, ledit élément de garniture étant composé d'une structure fibreuse fabriquée à partir de fils de polytétrafluoréthylène expansé ('PTFE' expansé).
PCT/US1997/019725 1996-11-01 1997-10-29 Garnitures de machine a papier fabriquees en ptfe expanse WO1998019860A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU50050/97A AU5005097A (en) 1996-11-01 1997-10-29 Paper machine clothings constructed of expanded ptfe
BR9706907A BR9706907A (pt) 1996-11-01 1997-10-29 Tecidos para máquina de papel construídos a partir de ptfe expandido
JP10521562A JPH11512157A (ja) 1996-11-01 1997-10-29 延伸したｐｔｆｅで構成された抄紙機織物
NZ330820A NZ330820A (en) 1996-11-01 1997-10-29 Paper machine belt constructed of expanded PTFE (polytetrafluoroethylene)
EP97912995A EP0996540A4 (fr) 1996-11-01 1997-10-29 Garnitures de machine a papier fabriquees en ptfe expanse
NO983031A NO983031L (no) 1996-11-01 1998-06-29 Papirmaskinduk

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74288896A 1996-11-01 1996-11-01
US08/742,888 1996-11-01

Publications (1)

Publication Number Publication Date
WO1998019860A1 true WO1998019860A1 (fr) 1998-05-14

Family

ID=24986654

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/019725 WO1998019860A1 (fr) 1996-11-01 1997-10-29 Garnitures de machine a papier fabriquees en ptfe expanse

Country Status (11)

Country Link
EP (1) EP0996540A4 (fr)
JP (1) JPH11512157A (fr)
KR (1) KR19990076931A (fr)
AU (1) AU5005097A (fr)
BR (1) BR9706907A (fr)
CA (1) CA2241818A1 (fr)
ID (1) ID19726A (fr)
NO (1) NO983031L (fr)
NZ (1) NZ330820A (fr)
WO (1) WO1998019860A1 (fr)
ZA (1) ZA979813B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2698459A4 (fr) * 2011-04-11 2014-11-12 Nippon Filcon Kk Armure à deux couches pour tissu non tissé

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953566A (en) * 1970-05-21 1976-04-27 W. L. Gore & Associates, Inc. Process for producing porous products
US4162190A (en) * 1974-04-29 1979-07-24 Scapa-Porritt Limited Paper makers wet felts

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4359501A (en) * 1981-10-28 1982-11-16 Albany International Corp. Hydrolysis resistant polyaryletherketone fabric

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953566A (en) * 1970-05-21 1976-04-27 W. L. Gore & Associates, Inc. Process for producing porous products
US4162190A (en) * 1974-04-29 1979-07-24 Scapa-Porritt Limited Paper makers wet felts

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0996540A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2698459A4 (fr) * 2011-04-11 2014-11-12 Nippon Filcon Kk Armure à deux couches pour tissu non tissé

Also Published As

Publication number Publication date
KR19990076931A (ko) 1999-10-25
NO983031D0 (no) 1998-06-29
JPH11512157A (ja) 1999-10-19
BR9706907A (pt) 1999-07-20
EP0996540A1 (fr) 2000-05-03
ID19726A (id) 1998-07-30
ZA979813B (en) 1998-05-22
CA2241818A1 (fr) 1998-05-14
EP0996540A4 (fr) 2000-08-30
NO983031L (no) 1998-09-01
NZ330820A (en) 2000-08-25
AU5005097A (en) 1998-05-29

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