Classifications

• • 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
  • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
  • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
  • D02G1/0286—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist characterised by the use of certain filaments, fibres or yarns
• • 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
  • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
  • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist

Definitions

• This invention relates to a process for the production of bulked yarns of thermoplastic high polymers by heating and twisting, thermoplastic high polymers which contain crystal nucleating agents being used.
• bulked yarn of thermoplastic high polymers for example polyamides
• the yarn coming from the supply package passes over a tfeed roller, then through a treatment zone in which it is subjected to a wet treatment and/or a heat treatment, then through the twist head of the false-twist machine and finally to a delivery roller.
• the yarn is in a highly twisted condition shortly after leaving the feed roller and is untwisted again immediately after the twist head.
• thermoplastic high polymer yarn particularly polyamide yarn
• Yarn made in this way has greater extensibility and higher hulk than yarn which has been crimped [by prior art methods.
• Woven or knitted fabrics which have bee-n made from yarn cn'mped in accordance with this invention have a particularly warm handle.
• the process according to this invention may be carried out by conventional methods on a false-twist device.
• the false-twist device may consist for example substantially of a supply package, heating zone, a false-twist head and a take-up package.
• crystal nucleating agents which may advantageously be used in amounts of 0.05 to 1% by weight: plastics whose melting point is higher than that of the thermoplastic from which the yarn is made, nylon 22 (polyethylenediamine oxalate), pigments in finely divided condition or dyes.
• plastics whose melting point is higher than that of the thermoplastic from which the yarn is made
• nylon 22 polyethylenediamine oxalate
• pigments in finely divided condition or dyes e.g., polyethylenediamine oxalate
• crystal-forming substances conventionally used in the pro- :duction of polyamides having fine crystalline structure by extrusion may also be used.
• Suitable synthetic high molecular weight polymers of which the yarn may consist are polyamides, particularly nylon 6 polycaprolactam. Saturated polyesters or polypropylene are also suitable.
• Bulked yarn prepared according to this invention is 3,434,278 Patented Mar. 25, 1969 particularly suitable for the production of extensible knitted and woven goods.
• EXAMPLE 1 A polyamide yarn having a relative viscosity of 2.6 and a total denier of 70 has a false twist inserted at the rate of 4120 turns per meter at 185 C. and is then doubled with a similarly treated yarn twisted in the opposite direction to 140 total denier at turns per meter. The product has a crimp rigidity of 65.1%.
• EXAMPLE 2 A 70 denier polyamide yarn having a relative viscosity of 2.6 is passed at 180 C. through a false-twist machine to insert a twist of 3800 turns per meter and is then doubled at 80 turns with a similarly treated yarn which has been twisted in the opposite direction.
• the product has a crimp rigidity of 67.6%. Practically the same crimp rigidity (68.9%) is obtained when 0.1% of a crystal nucleating agent (nylon 22) is added to the textile raw material, under otherwise identical conditions, but the effect is obtained at only 3300 turns per meter. This represents an increase in rate of production in the ratio of about 1.2: 1.
• EXAMPLE 3 A 60 denier polyester yarn consisting of 12 filaments has a false-twist inserted at the rate of 3160 turns per meter at 225 C. and is then doubled with a similarly treated yarn twisted in the opposite direction to total denier at 80 turns per meter.
• the yarn thus obtained has a residual extensibility to the fully extended condition of 3.1%.
• a similarly treated yarn made from a raw material to which 0.3% of magnesium oxide has been added as crystal nucleating agent prior to spinning is capable of extension by 3.6% beyond its extension at a load of 0.025 g./ den.
• a process 'for production of crimped, thermoplastic rpolycaprolactam yarn by heating and then twisting polyamide multifilament yarn wherein the filaments are polycaprolactam filaments containing, as a crystal nucleating agent, 0.051% of polyethylenediaimine oxalate.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Artificial Filaments (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6980490

Family Applications (1)

Country Status (6)

Cited By (2)

Citations (9)

• 1964
  • 1964-12-24 DE DE1964B0079896 patent/DE1232702C2/de not_active Expired
• 1965
  • 1965-12-16 CH CH1736165A patent/CH477574A/de not_active IP Right Cessation
  • 1965-12-17 NL NL656516517A patent/NL142463B/xx unknown
  • 1965-12-20 US US515171A patent/US3434278A/en not_active Expired - Lifetime
  • 1965-12-21 FR FR43068A patent/FR1460481A/fr not_active Expired
  • 1965-12-23 GB GB54517/65A patent/GB1125148A/en not_active Expired

Patent Citations (9)

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