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
  • D02G1/0206—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 by false-twisting

Definitions

• this problem is resolved by imparting to the yarn a reduced temporary twist, and by effecting heat-setting at least 55 C. below the melting temperature of the fiber material.
• the temporary twist may be between 20 and 30 percent lower than calculated according to the formula where T is the number of twists and D is the denier number of the yarn, and the heat-setting treatment may be effected at a temperature situated between 55 and 70 C. below the melting point of the fiber material.
• the process of the present invention is particularly suitable for texturing multifilament yarns, the single filaments of which present a multilobal, e.g., a trilobal cross-section, and which consist of polyamides, particularly poly hexamethylene adipamide (polyamide 66).
• the process is, however, also suitable for yarns, the single filaments of which present other non-circular cross-sections and which consist of other synthetic thermoplastic materials, such as e.g., polyesters, particularly poly ethylene glycol terephtalate, polyacrylonitrile or polypropylene.
• the process of this invention may be practiced by means of an ordinary false-twist device such as is used for the texturing of textile yarns. Examples of such devices are disclosed in US. Pat. Nos. 3,l42,953;
• one yarn which has been temporarily twisted in S direction is ply-twisted with a yarn which has been temporarily twisted in Z direction and ply-yam is knitted on knitting machines.
• yarns of relatively coarse titers it is, however, also possible to knit alternatively S and Z twisted yarns on knitting machines.
• a multifilament yarn of poly hexamethylene adipamide, denier, consisting of 20 filaments with a trilobal cross-section was temporarily high-twisted to 2300 twists per meter by means of a false-twist device, exposed to hot air of 190 C. for 0.5 seconds and cooled before entering the false-twist spindle.
• a yarn so-treated and false-twisted in S direction and a yarn so-treated and false-twisted in Z direction were plytwisted with turns per meter.
• a textured yarn was obtained, the original high lustre of which has been conserved to a great extent in spite of the texturing treatment.
• a multifilament yarn of poly hexamethylene adipamide, denier, consisting of 34 filaments with trilobal cross-section was temporarily high-twisted to 2,000 turns per meter in S direction by means of a false-twist device and exposed to hot air of I90 C. for approximately 0.5 seconds in the high-twisted condition and cooled before entering the twist imparter of the false-twist device.
• a multifilament yarn of poly hexamethylene adipamide, 40 denier, consisting of l3 filaments of a circular cross-section was given a false-twist of 3,900 turns per meter in 2 direction, this yarn being passed through hot air of 220 C. in the high-twisted condition of approximately 0.5 seconds and then cooled.
• the two thus-textured yarns were ply-twisted with 60 turns per meter in 8 direction.
• a combination yarn with a boucle-like appearance was obtained, permitting the obtaining of interesting fashion effects on goods knitted therefrom.
• EXAMPLE 3 A multifilament yarn of poly ethylene glycol terephtalate, denier, consisting of 44 filaments of a trilobal cross-section, was temporarily high-twisted, by means of a false-twist device, to 1,700 turns per meter and exposed to hot air of 195 C. for approximately 0.5 seconds. One half of the quantity of yarn to be processed was twisted in S direction and the other in Z direction. The thus-obtained textured yarn presents intense lustre. Yarns temporarily twisted in S and Z direction may be knitted alternatively on a knitting machine.

Landscapes

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

Applications Claiming Priority (1)

Publications (1)

Family

ID=4219006

Family Applications (1)

Country Status (7)

Cited By (8)

Citations (4)

• 1970
  • 1970-02-09 CH CH180570A patent/CH519036A/de not_active IP Right Cessation
  • 1970-02-09 CH CH180570D patent/CH180570A4/xx unknown
• 1971
  • 1971-01-11 NL NL7100308A patent/NL7100308A/xx unknown
  • 1971-01-21 US US108607A patent/US3698177A/en not_active Expired - Lifetime
  • 1971-01-22 BE BE761905A patent/BE761905A/xx unknown
  • 1971-02-09 ZA ZA710805A patent/ZA71805B/xx unknown
  • 1971-02-09 FR FR7104275A patent/FR2078376A5/fr not_active Expired
  • 1971-04-19 GB GB2092971A patent/GB1334806A/en not_active Expired

Patent Citations (5)

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