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
• • 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
  • D21F7/086—Substantially impermeable for transferring fibrous webs
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
  • D01F6/78—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products
  • D01F6/80—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products from copolyamides
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
  • D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
  • D01F6/90—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyamides
• • 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

Definitions

• the invention relates to technical monofilaments made from 100 to 96% by weight of a thread-forming copolyamide (CPA) or a mixed polyamide (MPA) made from 80 to 99% by weight polyamide (PA) 6 and from 1 to 20% by weight one or several polyamides from the group PA 66, PA 12, PA 1 1, with higher softness and improved transverse stability.
• CPA thread-forming copolyamide
• MPA mixed polyamide
• PA polyamide
• PA polyamide
• Knitted fabrics or felting in particular of conveyor belts, classifying fabrics, screen printing fabrics, shaped screen fabrics, press felts and seam press felts, and also press felts or seam press felts for paper production or cellulose production made from the monofilaments.
• thermoplastic polymers The processes for producing monofilaments from thermoplastic polymers are known in principle (cf. Handbuch der Kunststofftechnik II, C. Hauser Verlag, Kunststoff 1986, pages 295-319).
• Fabrics in the forming section consist predominantly of polyesters (hereinafter referred to as PES for short).
• PES polyesters
• PA polyamide
• the base fabrics for the press felts or seam press felts are made almost exclusively from polyamide fibers and monofilaments, preferably from pure PA 6, but also from PA 66.
• a nonwoven layer made of polyamide fibers is then needled onto the monofilament base fabric and mechanically anchored in the base fabric.
• dryer fabrics usually consist of PES monofilament or PAN multifilament.
• PES monofilament or PAN multifilament.
• PAN multifilament The known disadvantages have arisen in the known technical monofilaments, among others.
• the monofilaments are quickly damaged and the strength of the fabric is undesirably reduced.
• the strength of the base fabric after needling is another critical parameter that determines, for example, the service life of the screens or tapes that are produced from the base fabric.
• the known monofilaments made of pure PA and fabric / felts made from them still have an excessive loss of strength after needling, which results in a too short running time or machine life of the felts on the paper machines.
• the object of the invention is therefore to improve the following properties of technical monofilaments:
• the object is achieved according to the invention by new technical monofilaments which are the subject of the invention with a diameter of 0.05 to 1 mm, in particular 0.1 to 0.8 mm, particularly preferably 0.2 to 0.5 mm, the monofilaments are composed of
• the auxiliaries are basically known auxiliaries for the production of fibers and are selected in any combination from the group of
• Extrusion aids or mold release agents in particular salts of C ] 0 - C 22 fatty acids of Ca, Mg or Zn, particularly preferably Mg stearate, Ca stearate, Zn stearate,
• Nucleating agents especially talc or
• coloring additives such as dyes and / or pigments.
• Preferred monofilaments are characterized in that the copolyamides CPA or mixed polyamides MPA from 99 to 85 wt .-% PA 6 and 15 to 1 wt .-% PA 66, preferably from 98 to 90 wt .-% PA 6 and 10 to
• PA 66 preferably in particular from 97 to 93% by weight of PA 6 and 7 to 3% by weight of PA 66, or from 99 to 85% by weight of PA 6 and from 15 to 1% by weight of PA 12, preferably from 98 to 90% by weight of PA 6 and 10 to 2% by weight of PA 12, preferably in particular from 97 up to 93% by weight of PA 6 and 7 to 3% by weight of PA 12,
• Preferred monofilaments are also ternary copolyamides CPA or mixed polyamides MPA made from 98 to 80% by weight of PA 6, from 1 to 19% by weight of PA 66 and from 1 to 19% by weight of PA 12, preferably from 98 to 90% by weight .-% PA 6, from
• PA 6 or from 98 to 80% by weight of PA 6, from 1 to 19% by weight of PA 66 and from 1 to 19% by weight of PA 11, preferably from 98 to 90% by weight of PA 6, from 9 to 1 wt .-% PA 66 and from 9 to 1 wt .-% PA 11 exist.
• Another object of the invention is the use of monofilaments
• CPA thread-forming copolyamide
• MPA mixed polyamide
• Aging stabilizers especially sterically hindered phenols (SGP), aromatic amines or copper salts, especially those of the monovalent
• Extrusion aids or mold release agents in particular salts of C ] 0 - C 22 fatty acids of Ca, Mg or Zn, particularly preferably Mg stearate, Ca stearate, Zn stearate,
• Nucleating agents especially talc or
• coloring additives such as dyes and / or pigments
• the monofilaments are preferably used in so-called technical textiles, such as fabrics and felts for use in industry, e.g. of conveyor belts, classifying fabrics, screen printing fabrics, shaped screen fabrics, press felts and seam press felts, particularly preferably of press felts and seam press felts for paper production or cellulose production.
• technical textiles such as fabrics and felts for use in industry, e.g. of conveyor belts, classifying fabrics, screen printing fabrics, shaped screen fabrics, press felts and seam press felts, particularly preferably of press felts and seam press felts for paper production or cellulose production.
• Monofilaments are preferably used in which the copolyamides CPA or mixed polyamides MPA consist of from 99 to 85% by weight of PA 6 and 15 to 1% by weight of PA 66, preferably from 98 to 90% by weight of PA 6 and 10 to 2 % By weight of PA 66, preferably in particular from 97 to 93% by weight of PA 6 and 7 to 3% by weight of PA 66,
• PA 6 or from 99 to 85% by weight of PA 6 and from 15 to 1% by weight of PA 12, preferably from 98 to 90% by weight of PA 6 and 10 to 2% by weight of PA 12, preferably in particular from 97 up to 93% by weight of PA 6 and 7 to 3% by weight of PA 12,
• PA 6 and 15 to 1% by weight of PA 11 preferably from 98 to 90% by weight of PA 6 and 10 to 2% by weight of PA 11, preferably in particular from 98 to 93 wt .-% PA 6 and 7 to 2 wt .-% PA 11 exist.
• Monofilaments in which ternary copolyamides CPA or mixed polyamides MPA are present are also preferably used, from 98 to 80% by weight of PA 6, from
• PA 66 and PA 12 1 to 19% by weight of PA 66 and from 1 to 19% by weight of PA 12, preferably from 98 to 90% by weight of PA 6, from 9 to 1% by weight of PA 66 and from 9 to 1% by weight.
• the invention further relates to press felts or seam press felts, in particular those which are suitable for the production of paper, produced essentially from monofilaments of the composition mentioned above
• the raw materials for the monofilaments, the above-mentioned CPA or MPA and the auxiliaries are made according to basically known methods (see, for example, Handbuch der Kunststofftechnik II, C Hauser Verlag, Kunststoff 1986, pages 295-319 or according to published patent application DE 4336097), e.g. at a temperature of typically 230 ° C to 330 ° C, melt-extruded from spinnerets, cooled and further processed into monofilaments.
• the monofilaments can be provided with conventional preparations by external application, eg with fatty acid salts or oils
• the new monofilaments and the base fabrics made from them are characterized by permanently improved transverse stability (i.e. increased resistance to mechanical stresses transverse to the monofilament), abrasion resistance, alternating bending resistance (resistance to alternating bending stress of the monofilaments), higher softness, higher residual strength of the monofilaments in the press felt after Needling, better and safer processability of the monofilament to technical fabrics
• the monofilaments according to the invention in particular those made from CPA of the above-mentioned composition, have a significantly higher transverse stability and
• the transverse stability of the monofilaments is determined using a so-called impact test. For this purpose, monofilament bundles are struck against a metal rod at a frequency of 2000 times per minute on a device for testing the mechanical resistance. This stress transverse to the monofilament axis can be correlated with the periodic compressive stress of the felt in the press section of the paper machine.
• the alternating bending strength of the monofilaments is usually determined by a so-called buckling test.
• the resistance of the monofilaments to alternating bending stress is tested, for example, on a permanent bending tester No. 842 from Franck. It has a fixed and a movable clamp. During the bending process, the monofilament is loaded with 10% of the tensile strength and bent 280 x per minute by 2 X 90 °. To determine the number of buckling breaks, the number of bending processes of the monofilament is counted, which are carried out on average until the monofilament breaks.
• the softness of the monofilaments is determined by their bending stiffness.
• copolyamides or polyamides mentioned in Tables 1 to 3 under raw materials were produced in accordance with the procedure according to German published patent application DE 4336097 by melt spinning on a monofilament spinning / stretching installation.
• the respective polymer melt was spun from a spinneret for cooling in a water bath at about 20 to 30 ° C.
• the monofilaments formed were then drawn in hot water at about 85 ° C. and then in hot air and fixed in hot air in a fixing section.
• Table 1 shows monofilaments with a diameter of 0.4 mm (Examples Nos. 1 to 2).
• Table 2 shows monofilaments with a diameter of 0.5 mm (Examples Nos. 3 to 5).
• Table 3 shows monofilaments with a diameter of 0.2 mm (Examples Nos. 6 to 8).
• Examples Nos. 1, 3, 4 and 6 show that the monofilaments according to the invention have a significantly lower bending stiffness and are therefore softer, that they have a higher alternating bending stiffness and that their transverse stability is higher. They show less length loss in the impact test and have both a higher knot strength and a higher loop force than conventional monofilaments made of PA6 (see comparative examples 2, 5, 7 and 8).
• Monofilament diameter 0.50 mm spinning raw materials: CPA 6.6 / 5 + stabilizer or
• Monofilament diameter 0.20 mm spinning raw materials: CPA 6.6 / 5 + stabilizer
• HZKD maximum tensile force expansion

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Artificial Filaments (AREA)
• Woven Fabrics (AREA)
• Paper (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7810836

Family Applications (1)

Country Status (9)

Families Citing this family (6)

Family Cites Families (6)

• 1996
  • 1996-11-07 DE DE19645786A patent/DE19645786A1/de not_active Withdrawn
• 1997
  • 1997-10-27 WO PCT/EP1997/005934 patent/WO1998020200A1/de not_active Application Discontinuation
  • 1997-10-27 JP JP52101198A patent/JP2001503481A/ja active Pending
  • 1997-10-27 KR KR1019990704003A patent/KR20000053080A/ko not_active Application Discontinuation
  • 1997-10-27 EP EP97913180A patent/EP0937174A1/de not_active Withdrawn
  • 1997-10-27 PL PL97333137A patent/PL333137A1/xx unknown
  • 1997-10-27 BR BR9712903A patent/BR9712903A/pt not_active Application Discontinuation
  • 1997-10-27 AU AU50519/98A patent/AU5051998A/en not_active Abandoned
  • 1997-10-27 CZ CZ991648A patent/CZ164899A3/cs unknown

Non-Patent Citations (1)

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