EP0161579A2 - Toile de séchage comprenant des fils de chaîne en polyphénylène sulphide extrudable au fondu - Google Patents

Toile de séchage comprenant des fils de chaîne en polyphénylène sulphide extrudable au fondu Download PDF

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Publication number
EP0161579A2
EP0161579A2 EP85105288A EP85105288A EP0161579A2 EP 0161579 A2 EP0161579 A2 EP 0161579A2 EP 85105288 A EP85105288 A EP 85105288A EP 85105288 A EP85105288 A EP 85105288A EP 0161579 A2 EP0161579 A2 EP 0161579A2
Authority
EP
European Patent Office
Prior art keywords
fabric
polyphenylene sulphide
monofilament
dryer
dryer fabric
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.)
Granted
Application number
EP85105288A
Other languages
German (de)
English (en)
Other versions
EP0161579A3 (en
EP0161579B1 (fr
Inventor
Samuel M. Baker
F. Brian Best
Girish M. Bhatt
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.)
Jwi Ltd
Original Assignee
Jwi Ltd
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 Jwi Ltd filed Critical Jwi Ltd
Publication of EP0161579A2 publication Critical patent/EP0161579A2/fr
Publication of EP0161579A3 publication Critical patent/EP0161579A3/en
Application granted granted Critical
Publication of EP0161579B1 publication Critical patent/EP0161579B1/fr
Expired 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
    • 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
    • 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
    • D21F1/0072—Link belts

Definitions

  • the present invention relates to fabrics made of synthetic materials and particularly, but not exclusively, for use in dryer sections of papermaking machines involving high temperature.
  • 4,290,209 discloses the use of rectangular cross-section warp strands having a flattening ratio of about 2:1, whereby the resulting fabric acquires superior properties of distortion resistance and surface smoothness, along with more desirable permeability and elastic modulus. None of these improved fabrics, however, are suitable for high temperature applications, again because of the inherent tendency of the polymers normally used to degrade and lose strength.
  • U.S. 4,359,501 discloses an industrial fabric, for use in applications involving elevated temperatures, comprised of melt-extrudable polyaryletherketone monofilament strands. This material, however, suffers the major disadvantage of being so costly that the woven end product is not economically attractive to the specific paper mill end-users already identified.
  • the present invention is directed towards solving these problems.
  • the present invention provides a dryer fabric for use in a dryer section of a paper machine wherein at least the machine direction components of the fabric are monofilaments made from polyphenylene sulphide or a blend of polyphenylene sulphide with heat-stabilized polyamide 66 with the polyamide 66 being present in the range of up to about 20% by weight.
  • polyphenylene sulphide is blended with about 6% by weight of heat-stabilized polyamide 66.
  • the dryer fabric comprises a plurality of interwoven warp and weft strands wherein at least the warps are monofilaments made from polyphenylene sulphide or a blend of polyphenylene sulphide with heat-stabilized polyamide 66 the warp strands having an essentially rectangular cross-section with the long axis of the rectangle lying in the plane of the fabric.
  • the dryer fabric comprises a multiplicity of helical coils connected together by hinge pins wherein at least the helical coils are made from polyphenylene sulphide or a blend of polyphenylene sulphide with heat-stabilized polyamide 66.
  • the dryer fabric comprises a multiplicity of helical coils connected together by hinge pins wherein at least the helical coils are made from polyphenylene sulphide or a blend of polyphenylene sulphide with heat-stabilized polyamide 66 and wherein the helical coils have an essentially rectangular cross-section when viewed in the machine direction with the long axis of the rectangle lying in the plane of the fabric.
  • Monofilaments of the type described above can also be used to advantage in other industrial applications where hydrolysis is encountered.
  • Fig. 1 there is schematically illustrated a sub-section of a typical dryer section in a papermaking machine (not shown).
  • the top tier dryer cylinders are generally indicated at 10 and the bottom tier at 11.
  • the paper web 13 passes in a serpentine fashion over the top and bottom dryer cylinders as shown.
  • An endless top fabric 14 holds the paper web 13 tightly against the upper cylinders 10 as it passes partially around the first upper cylinder, around a felt roll 15, partially around the remaining top cylinders 10 and around the other intervening felt rolls 15, then around return roll 16, passing over guide and tensioning rolls 24 and 23 respectively, and then over other return rolls 16 before it passes again over the first dryer cylinder to complete the cycle.
  • an endless bottom fabric 18 holds the paper web 13 tightly against the lower dryer cylinders 11 as it passes around these and the intervening bottom felt rolls 19, return rolls 21, tensioning roll 25, guide roll 26, and other return rolls 21, substantially as shown.
  • Polyphenylene sulphide is a linear high molecular weight polymer having the repeating unit and is available commercially under the registered trademark RYTON from Phillips Chemical Corporation. While priced at a fraction of the material of U.S. 4,359,501, pure polyphenylene sulphide of the present invention is difficult to extrude. It is also lacking in "toughness" required for industrial weaving.
  • Table 1 shows the results of a test with the percent retained tensile strength of a polyphenylene sulphide strand exposed to saturated ateam at 130°C in a pressure vessel (24 gauge psi) for a period of eight days, along with a polyester monofilament strand of the same size.
  • Table 2 shows test results for the same materials when exposed to saturated steam at 150°C.
  • the material can only be extruded with difficulty in monofilament form in the size range commonly used in dryer fabrics. Also during weaving the pure material is subject to frequent warp breakages due to its lack of toughness and is prone to scraping in the loom heddles and reed dents, all of which renders pure polyphenylene sulphide difficult for heavy industrial weaving.
  • the means by which the additive improves toughness while preserving hydrolysis resistance is not entirely known, but the successful monofilaments are characterized by having the additive material present in small, discrete, elongated globules with the long axis parallel to the axis of the monofilament. These discrete globules are not connected to each other or to the outer boundaries of the monofilament, and are thus protected from the harsh environment of the end use application of the filament.
  • the melt viscosity of the added material must be higher than the melt viscosity of polyphenylene sulphide at the extrusion temperature and the amount of additive must be limited.
  • Another factor to consider in choosing the additive is that it must not degrade during extrusion when it is temporarily exposed to the temperature required to melt the polyphenylene sulphide, the range being 285°c to 315°C.
  • Some additives which satisfy the above mentioned requirements do not form globules because they are chemically incompatible with polyphenylene sulphide and react in unsuitable ways.
  • heat-stabilized polyamide 66 is the only additive to polyphenylene sulphide which successfully imparts the quality of toughness to the resultant monofilament while preserving hydrolysis resistance.
  • Other materials may be found which can also impart the same quality to the blend.
  • Some factors which are important in choosing additives are: a higher viscosity at extrusion temperature than polyphenylene sulphide, chemical compatibility, resistance to heat degradation during extrusion.
  • Figs. 2 and 2A depict a plain weave dryer fabr: 30 representative of a single-layer dryer fabric used in the papermaking industry.
  • numeral 31 denotes consecutive warp strands made from polyphenylene sulphide or a blend of polyphenylene sulphide and polyam 66 flattened to an essentially rectangular cross-section and numeral 32 represents consecutive weft strands.
  • each warp strand 31 passes over a first weft strand 32, under the second weft strand, over the third and so on.
  • the adjacent warp strand passes under the first weft, over the second, under the third and so on.
  • Figs. 3 and 3A depict a four-shaft eight-repeat duplex-weave dryer fabric 40, which is a type commonly used in the papermaking industry.
  • numerals 41, 42, 43 and 44 are consecutive warp strands, made from polyphenylene sulphide or a blend of polyphenylene sulphide and polyamide 66, flattened to an essentially rectangular cross-section. The weft is paired in two layers and numbered 48 to 57 as shown.
  • a warp strand 41 passes in sequence over a pair of weft strands 50-51, between the next pair 52-53, under the third pair 54-55, between the fourth pair 56-57, and so on.
  • next consecutive warp strand 42 passes between the first pair of weft strands 50-51, over the second pair, between the third pair and under the fourth pair.
  • third and fourth consecutive warp strands 43 and 44 are woven commencing under and between the first pair of weft strands respectively.
  • Fig. 4 depicts the essentially rectangular cross-section of the polyphenylene sulphide or polyphenylene sulphide/polyamide blend warp strands.
  • Such strands may be produced by rolling round monofilament strands, or by slitting film, or, in the preferred embodiment by melt-extruding through a specially shaped die.
  • the flatness ratio a:b of the preferred embodiment shown in Fig. 4 is 2:1 and is preferably between 1.5:1 and 2.5:1 for the woven dryer fabric embodiments.
  • Figs. 5 and 5A depict a spiral construction dryer felt 60 comprising a plurality of helical S-coils 61 joined together with adjacent Z-coils 62 by means of hinge pins 63.
  • the designations 's' and 'Z' indicate the direction of twist, following the convention in the textile industry.
  • the coils 61, 62. are wound using polyphenylene sulphide or polyphenylene sulphide/polyamide blend strand material of essentially rectangular cross-section with a flatness ratio a:b of 2:1 as shown in this preferred embodiment. In this construction a range of flatness ratios between 1.1:1 and 2.5:1 can be used.
  • the woven dryer fabric of the present invention has a warp count preferably in the range of 25 to 80 strands per inch.
  • Warp strands are made from polyphenylene sulphide or a blend of polyphenylene sulphide and polyamide 66.
  • the flattened warp strands of the invention will have major axis measurements in the range of 0.0125" to 0.050". With respect to weft it is not intended to limit the material utilized to monofilaments. Since in the fabric of the invention the weft strands are non- loadbearing, other materials resistant to high temperature and hydrolytic degradation may be utilized, for example composite strands incorporating asbestos or fiberglass.
  • the dryer fabric of spiral construction which is another embodiment of the invention, utilizes helical coils made from polyphenylene sulphide or a blend of polyphenylene sulphide and heat-stabilized polyamide 66 up to 20% by weight of polyamide 66.
  • Hinge pins may be made from the same material or alternatively from other temperature resistant materials such as the composite constructions already mentioned.

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  • Paper (AREA)
  • Woven Fabrics (AREA)
  • Artificial Filaments (AREA)
EP19850105288 1984-05-01 1985-04-30 Toile de séchage comprenant des fils de chaîne en polyphénylène sulphide extrudable au fondu Expired EP0161579B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US60582584A 1984-05-01 1984-05-01
US605825 1984-05-01
US72766585A 1985-04-26 1985-04-26
US727665 1991-07-09

Publications (3)

Publication Number Publication Date
EP0161579A2 true EP0161579A2 (fr) 1985-11-21
EP0161579A3 EP0161579A3 (en) 1986-08-13
EP0161579B1 EP0161579B1 (fr) 1990-02-07

Family

ID=27085066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850105288 Expired EP0161579B1 (fr) 1984-05-01 1985-04-30 Toile de séchage comprenant des fils de chaîne en polyphénylène sulphide extrudable au fondu

Country Status (4)

Country Link
EP (1) EP0161579B1 (fr)
CA (1) CA1261989A (fr)
DE (1) DE3575960D1 (fr)
FI (1) FI85738C (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0230228A2 (fr) * 1986-01-21 1987-07-29 Bayer Ag Procédé pour la fabrication d'une bande constituée de spirales et bande constituée de spirales obtenue selon ce procédé
EP0292186A2 (fr) * 1987-05-19 1988-11-23 Shakespeare Company Monofilaments, procédé pour leur fabrication et tissus préparés à partir de ces monofilaments
EP0364066A1 (fr) * 1988-10-14 1990-04-18 Asten Group Inc. Jonction des extrémités du tissu d'une machine à papier
EP0425641A1 (fr) * 1989-05-12 1991-05-08 Asten Group Inc. Toile indeformable de fabrication de papier
EP0520162A1 (fr) * 1991-06-26 1992-12-30 Wangner Systems Corporation Toile pour la fabrication de papier contenant des monofilaments et des fibres de téréphtalate de polypropylène
US5464685A (en) * 1994-03-25 1995-11-07 Asten, Inc. Textile dryer apparatus having an improved textile dryer fabric
WO2013023276A1 (fr) * 2011-08-15 2013-02-21 Astenjohnson, Inc. Tissu de gaufrage comprenant des ensembles de fils de chaîne
CN107988669A (zh) * 2018-01-15 2018-05-04 苏州耐德新材料科技有限公司 一种改性聚苯硫醚缝纫线制备方法及其复合的滤袋缝纫线

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4141139C2 (de) * 1991-12-13 1995-08-31 Voith Gmbh J M Siebgewebe für eine Papiermaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2418826A1 (fr) * 1978-03-03 1979-09-28 Huyck Corp Tissus pour la fabrication de papier
US4267227A (en) * 1980-01-11 1981-05-12 Albany International Corp. Press fabric resistant to wad burning
US4290209A (en) * 1978-05-17 1981-09-22 Jwi Ltd. Dryer fabric
EP0063380A2 (fr) * 1981-04-20 1982-10-27 E.I. Du Pont De Nemours And Company Monofilament résistant à l'abrasion et contenant du bisulfure de molybdène
EP0070708A2 (fr) * 1981-07-17 1983-01-26 E.I. Du Pont De Nemours And Company Courroies pour papeterie fabriquées de filaments polymériques mis en fusion

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2418826A1 (fr) * 1978-03-03 1979-09-28 Huyck Corp Tissus pour la fabrication de papier
US4290209A (en) * 1978-05-17 1981-09-22 Jwi Ltd. Dryer fabric
US4267227A (en) * 1980-01-11 1981-05-12 Albany International Corp. Press fabric resistant to wad burning
EP0063380A2 (fr) * 1981-04-20 1982-10-27 E.I. Du Pont De Nemours And Company Monofilament résistant à l'abrasion et contenant du bisulfure de molybdène
EP0070708A2 (fr) * 1981-07-17 1983-01-26 E.I. Du Pont De Nemours And Company Courroies pour papeterie fabriquées de filaments polymériques mis en fusion

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0230228A3 (fr) * 1986-01-21 1989-07-26 Bayer Ag Procédé pour la fabrication d'une bande constituée de spirales et bande constituée de spirales obtenue selon ce procédé
EP0230228A2 (fr) * 1986-01-21 1987-07-29 Bayer Ag Procédé pour la fabrication d'une bande constituée de spirales et bande constituée de spirales obtenue selon ce procédé
EP0292186B1 (fr) * 1987-05-19 1994-03-23 Shakespeare Company Monofilaments, procédé pour leur fabrication et tissus préparés à partir de ces monofilaments
EP0292186A2 (fr) * 1987-05-19 1988-11-23 Shakespeare Company Monofilaments, procédé pour leur fabrication et tissus préparés à partir de ces monofilaments
EP0364066A1 (fr) * 1988-10-14 1990-04-18 Asten Group Inc. Jonction des extrémités du tissu d'une machine à papier
EP0425641A1 (fr) * 1989-05-12 1991-05-08 Asten Group Inc. Toile indeformable de fabrication de papier
EP0425641A4 (en) * 1989-05-12 1991-10-16 Asten Group Inc. Dimensionally stable papermakers fabric
US5240763A (en) * 1989-05-12 1993-08-31 Asten Group, Inc. Dimensionally stable papermakers fabric
EP0520162A1 (fr) * 1991-06-26 1992-12-30 Wangner Systems Corporation Toile pour la fabrication de papier contenant des monofilaments et des fibres de téréphtalate de polypropylène
US5464685A (en) * 1994-03-25 1995-11-07 Asten, Inc. Textile dryer apparatus having an improved textile dryer fabric
US5562968A (en) * 1994-03-25 1996-10-08 Asten, Inc. Textile dryer fabric
WO2013023276A1 (fr) * 2011-08-15 2013-02-21 Astenjohnson, Inc. Tissu de gaufrage comprenant des ensembles de fils de chaîne
CN107988669A (zh) * 2018-01-15 2018-05-04 苏州耐德新材料科技有限公司 一种改性聚苯硫醚缝纫线制备方法及其复合的滤袋缝纫线

Also Published As

Publication number Publication date
EP0161579A3 (en) 1986-08-13
FI85738C (fi) 1992-05-25
DE3575960D1 (de) 1990-03-15
FI851691A0 (fi) 1985-04-29
EP0161579B1 (fr) 1990-02-07
FI851691L (fi) 1985-11-02
FI85738B (fi) 1992-02-14
CA1261989A (fr) 1989-09-26

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