EP0161579B1 - 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
EP0161579B1
EP0161579B1 EP19850105288 EP85105288A EP0161579B1 EP 0161579 B1 EP0161579 B1 EP 0161579B1 EP 19850105288 EP19850105288 EP 19850105288 EP 85105288 A EP85105288 A EP 85105288A EP 0161579 B1 EP0161579 B1 EP 0161579B1
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EP
European Patent Office
Prior art keywords
monofilament
fabric
polyphenylene sulphide
dryer fabric
dryer
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
EP19850105288
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German (de)
English (en)
Other versions
EP0161579A2 (fr
EP0161579A3 (en
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
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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
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
    • 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. Furthermore the present invention relates to monofilaments suitable for use in such fabrics.
  • 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 night.
  • 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.
  • the present invention also comprises a monofilament as set forth in claim 12 and a synthetic fabric made therefrom. Further advantageous embodiments of the invention are defined in the subordinate class.
  • 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 steam 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 compatability, resistance to heat degradation during extrusion.
  • the woven dryer fabric of the present invention has a warp count preferably in the range of 25 to 80 strands per inch (2.5 cm).
  • Warp strands are made by 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" (0.32 to 1.27 mm). 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 fibreglass.
  • 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)

Claims (19)

1. Toile de séchage pour l'utilisation dans une section de séchage d'une machine à papier, dans laquelle au moins les composants de la toile suivant la direction de la machine sont des monofilaments faits de poly(sulfure de phénylène) ou d'un mélange de poly(sulfure de phénylène) avec un polyamide 66 stabilisé en température, ledit polyamide 66 étant présent dans la plage de jusqu'à 20% en poids environ.
2. Toile de séchage selon la revendication 1, dans laquelle ledit poly(sulfure de phénylène) est mélangé avec environ 6% en poids de polyamide 66 stabilisé en température.
3. Toile de séchage selon la revendication 1, dans laquelle lesdits composants suivant la direction de la machine sont des brins de chaîne d'une toile de séchage tissée.
4. Toile de séchage selon la revendication 3, dans laquelle lesdits brins de chaîne sont des brins de chaîne aplatis ayant une section transversale substantiellement rectangulaire avec le grand axe du rectangle étendu dans le plan de ladite toile.
5. Toile de séchage selon la revendication 4, dans laquelle ladite toile de séchage tissée possède des brins de chaîne aplatis ayant une section transversale substantiallement rectangulaire avec un rapport d'aplatissement entre 1,5:1 et 2,5:1.
6. Toile de séchage selon la revendication 1, dans laquelle lesdits composants suivant la direction de la machine comportent une pluralité d'enroulements hélicoïdaux liés ensemble par des broches.
7. Toile de séchage selon la revendication 6, dans laquelle le monofilament desdits enroulements hélicoïdaux possède une section transversale substantiellement rectangulaire vu suivant la direction de la machine avec le grand axe du rectangle étendu dans le plan de ladite toile.
8. Toile de séchage selon la revendication 7, dans laquelle ladite section transversale a un rapport d'aplatissement entre 1,1:1 et 2,5:1.
9. Toile de séchage selon la revendication 1, dans laquelle lesdits monofilaments sont faits de poly(sulfure de phénylène) et d'un additif qui confère de la dureté au monofilament tout en conservant la résistance à l'hydrolyse propre au poly(sulfure de phénylène), ledit additif possédant des caractéristiques de viscosité de fusion supérieure à celle du poly(sulfure de phénylène) aux températures d'extrusion, de résistance à la dégradation thermique aux températures d'extrusion, et de compatibilité chimique avec le poly(sulfure de phénylène), et dans laquelle IequeI additif est présent en globules discrets allongés avec le grand axe desdits globules parallèles à l'axe du monofilament.
10. Toile de séchage selon la revendication 9, dans laquelle lesdits globules ne sont pas liés aux frontières extérieures du monofilament.
11. Toile de séchage selon la revendication 3, dans laquelle ladite toile possède un compte en chaîne dans la gamme de 25 à 80 brins par 2,54 cm (par inch).
12. Un monofilament fait d'un mélange de poly(sulfure de phénylène) et d'un additif, ledit additif conférant une dureté augmentée au monofilament résultant sans réduire sensiblement sa résistance à l'hydrolyse, ledit additif étant ajouté au poly(sulfure de phénylène) dans la plage de 1 % à 20% en poids et possédant les caractéristiques de
- viscosité supérieure à celle du poly(sulfure de phénylène) aux températures d'extrusion;
- résistance à la dégradation pendant l'extrusion;
- compatibilité chimique avec le poly(sulfure de phénylène);
- être présent dans le monofilament en petits globules allongés discrets, avec le grand axe desdits globules parallèles à l'axe du monofilament.
13. Monofilament selon la revendication 12, dans lequel l'additif est un polyamide 66 stabilisé en température.
14. Monofilament selon la revendication 13, dans lequel le polyamide 66 stabilisé en température représente environ 6% en poids du poly(sulfure de phénylène).
15. Monofilament selon la revendication 12, ayant une section transversale substantiellement rectangulaire avec un rapport d'axe entre 1,1 à 1 et 3 à 1.
16. Monofilament selon la revendication 15, avec un rapport d'axe d'environ 2 à 1.
17. Monofilament selon la revendication 15, ayant une dimension de grand axe dans la plage 0,32 à 1,27 mm (0,0125 à 0,050 inches).
18. Monofilament selon une quelconque des revendications précédentes 12 à 17, dans ledit lesdits globules discrets ne sont pas liés aux frontières extérieures du monofilament.
19. Toile industrielle synthétique comprenant une toile tissée à partir de monofilaments, ou une toile composée d'un pluralité de monofilaments enroulés en hélice et liés ensemble par des broches, dans laquelle lesdits monofilaments comprennent des monofilaments selon l'une des revendications 12 et 13.
EP19850105288 1984-05-01 1985-04-30 Toile de séchage comprenant des fils de chaîne en polyphénylène sulphide extrudable au fondu Expired - Lifetime EP0161579B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US60582584A 1984-05-01 1984-05-01
US72766585A 1985-04-26 1985-04-26
US727665 1991-07-09
US605825 2009-10-26

Publications (3)

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

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EP19850105288 Expired - Lifetime 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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4141139A1 (de) * 1991-12-13 1993-06-17 Voith Gmbh J M Siebgewebe fuer eine papiermaschine

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3601565A1 (de) * 1986-01-21 1987-07-23 Bayer Ag Verfahren zur herstellung von spiralsieben
US4748077A (en) * 1987-05-19 1988-05-31 Shakespeare Company Novel monofilaments, fabrics thereof and related process
US4862926A (en) * 1988-10-14 1989-09-05 Asten Group, Inc. Shaped monofilament coil seam and fabrics
US5240763A (en) * 1989-05-12 1993-08-31 Asten Group, Inc. Dimensionally stable papermakers fabric
US5137601A (en) * 1991-06-26 1992-08-11 Wangner Systems Corporation Paper forming fabric for use with a papermaking machine made of PPT fibers
US5464685A (en) * 1994-03-25 1995-11-07 Asten, Inc. Textile dryer apparatus having an improved textile dryer fabric
CA2748789A1 (fr) * 2011-08-15 2013-02-15 Derek Chaplin Embossage de tissu comprenant des ensembles de fils de chaine
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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4149571A (en) * 1978-03-03 1979-04-17 Huyck Corporation Papermaking fabrics
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
US4370375A (en) * 1981-04-20 1983-01-25 E. I. Du Pont De Nemours And Company Abrasion-resistant monofilament with molybdenum disulfide useful in the formation of papermaking belts
JPS5818497A (ja) * 1981-07-17 1983-02-03 イ−・アイ・デユポン・デ・ニモアス・アンド・カンパニ− 製紙用ベルト

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4141139A1 (de) * 1991-12-13 1993-06-17 Voith Gmbh J M Siebgewebe fuer eine papiermaschine

Also Published As

Publication number Publication date
EP0161579A2 (fr) 1985-11-21
DE3575960D1 (de) 1990-03-15
FI851691A0 (fi) 1985-04-29
FI85738C (fi) 1992-05-25
CA1261989A (fr) 1989-09-26
EP0161579A3 (en) 1986-08-13
FI851691L (fi) 1985-11-02
FI85738B (fi) 1992-02-14

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