Classifications

• • 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
  • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
  • D01F6/66—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyethers
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
  • D02G3/46—Sewing-cottons or the like
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/06—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyethers
  • D10B2331/061—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyethers polyetherketones, polyetheretherketones, e.g. PEEK
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2929—Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]

Definitions

• the invention relates to sewing thread made from at least one multifilament thread, the twisted individual filaments of which consist of a thermoplastic material.
• Sewing threads made from aromatic polyamide have a higher temperature resistance.
• their production is quite complex; in addition, their mechanical properties are determined by the manufacturing process (solution spinning), so that they are variable only within narrow limits and cannot be adapted to changing requirements. In addition, they are very difficult to dye. Such sewing threads have therefore not become very important in practice.
• melted polyether ketones can be spun into fibers and then stretched.
• a suitable spinning process is e.g. in EP-A-202 082.
• the multifilament yarns obtained have a wide range of properties.
• the individual titer is between 2.8 and 100 denier (corresponding to 2.5 to 90 dtex) and the elongation at break can be 15 to 200%.
• sewing threads can be produced from such fibers and which multifilament threads are particularly well suited for this.
• the invention was based on the task of developing sewing threads based on thermoplastic which have tear strength, elongation at break and dyeability equal to polyester and are also hydrolysis and solvent resistant and allow high sewing speeds even with modern sewing machines.
• thermoplastic is a polyether ketone and the multifilament yarn has a single filament titer (according to DIN 53 830) of 1.0 to 10 dtex, an elongation at break (according to DIN 53 815) of 3 to 30% and a boiling shrinkage ( according to DIN 53 866) of less than 10%.
• the sewing threads according to the invention have good mechanical properties, such as tensile strength, modulus of elasticity and elongation at break, and low shrinkage, and also excellent resistance to acids, alkalis and solvents.
• the good heat resistance which allows high sewing speeds, is particularly advantageous.
• Suitable thermoplastics are polyether ketones, preferably high molecular weight polymers with a relative viscosity, measured 0.5% in 96% sulfuric acid at 25 ° C. of more than 1.0, preferably more than 1.3.
• Preferred polyether ketones are those with the structural units Copolymers are also suitable in which up to 50% of the -CO groups by -SO2 groups or by are replaced.
• multifilament yarns are particularly suitable for the production of sewing threads which have a single filament titer (according to DIN 53 830) between 1.0 and 10, in particular between 1.5 and 6 dtex and their elongation at break (according to DIN 53 815) 3 to 30%, in particular 5 to 20%.
• the tensile strength of the yarn should preferably be between 4 and 10 cN / dtex.
• Their shrinkage, measured in boiling water according to DIN 53 866, should be less than 10%, preferably less than 2%.
• the heat shrinkage at 180 ° C. should preferably be below 20%, in particular below 8%.
• the multifilament yarns preferably consist of 10 to 1000, in particular 20 to 300 individual filaments.
• the multifilament yarns are preferably drawn immediately after the spinning process, the drawing ratio advantageously being between 1.5 and 5.
• the multifilaments can also be brought to the required high strengths and low elongation at break values in a rapid spinning process using high winding speeds.
• the sewing threads according to the invention are produced in the usual way from these multifilament threads.
• a twisted multifilament thread can already be used as a sewing thread.
• the direction of rotation S / Z is preferred for pre-twisting and untwisting.
• the ratio of ⁇ to ⁇ from front is expediently chosen so that the finished sewing yarn is balanced and curl-free.
• the twist (according to DIN 53 832) is defined by the equation where T / m means the turns per m.
• the sewing threads according to the invention can receive the usual processing preparations during the spinning process, for example lubricants such as mineral oils, ester oils and alkylene oxide adducts; Emulsifiers such as soaps and ionic or non-ionic surfactants; also antistatic agents such as phosphoric acid esters of ethoxylated fatty alcohols and ethoxylated fatty acid derivatives. They can also be subsequently equipped with paraffins, paraffin waxes or silicone waxes to improve the sliding properties.
• lubricants such as mineral oils, ester oils and alkylene oxide adducts
• Emulsifiers such as soaps and ionic or non-ionic surfactants
• antistatic agents such as phosphoric acid esters of ethoxylated fatty alcohols and ethoxylated fatty acid derivatives.
• paraffins, paraffin waxes or silicone waxes to improve the sliding properties.
• a particular advantage of using polyether ketone fibers is that the sewing threads can also be processed without heat equipment.
• the melt spinning apparatus consisted of a single-shaft extruder with 3 el. Heated heating zones, an electrically heated spinneret with 30 holes with a diameter of 0.4 mm, spinning pump (gear type), post-heating zone, blow chute and winding device.
• the heating zones of the extruder and the spinning head were set to a temperature such that the melt reached a temperature of 415 ° C.
• the throughput was 1.6 kg / h.
• the threads passed through an electrically heated reheater and an air-operated blowing shaft. They were drawn off at a winding speed of 850 m / min and then stretched in a ratio of 1: 3.0, the feed godet of the stretching device being heated to a temperature of 130 ° C. and the heating plate in the stretching field being heated to 250 ° C.
• the threads had the following properties: Total titer 109/30 dtex Single titer 3.6 dtex Tensile strength 5.4 cN / dtex Elongation at break 11.4% Boiling shrink 0.5% Hot air shrinkage 3.5% E-module 45.1 cN / dtex 2.
• a polyether ketone with the repeating units and a relative solution viscosity of 1.98 was spun in the apparatus described in Example 1.
• the temperature of the melt was 375 ° C
• the spinneret had 30 holes each 0.3 mm in diameter and the winding speed was 700 m / min at a throughput of 1.2 kg / h.
• the spun threads were then hot drawn in a ratio of 1: 2.9 at temperatures of 160 or 210 ° C and then had the following properties: Total titer 110/30 dtex Single titer 3.7 dtex
• a multifilament yarn according to example A2 is wound in parallel on a high-speed winding machine on disc spools.
• 3 of these disc spools are plugged onto the upper level of a thread-twisting-machine and first provided with a pre-wire in the S direction.
• the 3 twisted multifilament yarns are folded and twisted three times in the Z direction by means of a ring spindle.
• 530 turns per meter 3 Z, corresponding to ⁇ out 100, were selected for the subsequent unwrapping.
• the sewing thread can be dyed using the customary dyeing processes, but at an elevated temperature in the range from 180 ° to 200 ° C.
• this colored sewing thread is exceptionally good due to the high melting point of 334 ° C for polyether ketone and a maximum temperature for continuous loading of 250 ° C. This would make it possible to dispense with special sewing thread equipment. For reasons of better sliding properties when pulling through the thread guide elements of the sewing machine and when pulling into the material, we recommend additional equipment.
• silicone-containing waxes or emulsions are applied to the dyed sewing thread via a net roller or other known finishing methods for sewing threads, e.g. Equipment used in the dyeing machine.
• the sewing thread produced by this method has excellent sewing properties compared to conventional sewing thread. It was found in a sewing test that the sewing thread according to the invention has twice the length of the seam until breakage compared to polyester filament threads. The significantly better thermal and sewing properties are complemented by excellent hydrolysis resistance and resistance to chemicals, e.g. Hydrochloric acid, sulfuric acid, nitric acid, potassium hydroxide solution and trichlorethylene.
• chemicals e.g. Hydrochloric acid, sulfuric acid, nitric acid, potassium hydroxide solution and trichlorethylene.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Artificial Filaments (AREA)
• Materials For Medical Uses (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (3)

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Family Applications (1)

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• 1989
  • 1989-03-30 DE DE3910258A patent/DE3910258A1/de not_active Withdrawn
• 1990
  • 1990-03-26 DE DE90105692T patent/DE59004573D1/de not_active Expired - Lifetime
  • 1990-03-26 EP EP90105692A patent/EP0390025B1/de not_active Expired - Lifetime
  • 1990-03-26 CA CA002013085A patent/CA2013085A1/en not_active Abandoned
  • 1990-03-26 ES ES90105692T patent/ES2049360T3/es not_active Expired - Lifetime
  • 1990-03-26 AT AT90105692T patent/ATE101664T1/de not_active IP Right Cessation
  • 1990-03-28 US US07/501,790 patent/US5133178A/en not_active Expired - Fee Related
  • 1990-03-28 JP JP2077130A patent/JPH02277836A/ja active Pending
  • 1990-03-29 AU AU52350/90A patent/AU5235090A/en not_active Abandoned
  • 1990-03-30 KR KR1019900004311A patent/KR970010725B1/ko active IP Right Grant

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