US3685276A - Process for the production of moderately elastic crimp yarns - Google Patents

Process for the production of moderately elastic crimp yarns Download PDF

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Publication number
US3685276A
US3685276A US58820A US3685276DA US3685276A US 3685276 A US3685276 A US 3685276A US 58820 A US58820 A US 58820A US 3685276D A US3685276D A US 3685276DA US 3685276 A US3685276 A US 3685276A
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United States
Prior art keywords
false
stretching
twist
filaments
stage
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Expired - Lifetime
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US58820A
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English (en)
Inventor
Herbert Scherzberg
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Bayer AG
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Bayer AG
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Publication date
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    • 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
    • D02G1/0226—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 multiple false-twisting

Definitions

  • This invention relates to a continuous process for the production of a moderately elastic crimp yarn from unstretched synthetic filaments by the false-twist method.
  • unstretched synthetic material can be combined with the crimping operation and the elasticity of the highly elastic crimp yarn similarly reduced by a subsequent heat treatment so that it can be used in the manufacture of outer clothing.
  • unstretched synthetic material can be stretched under heat in two stages and given a false twist in opposite directions during stretching.
  • This yarn can either be moderately elastic, for example for use in the manufacture of outer clothing, or highly elastic, for example for use in the production of sports clothing, depending both upon the temperature and the degree of twist during the stretching operations in the two stages.
  • the false-twist crimping process together with the stretching operation carried out under heat in two stages, accompanied by false-twisting in opposite directions, does not have the disadvantage of the occurrence of different capillary lengths.
  • the yarn is regular without any tendancy towards twisting, although it does have the disadvantage of high residual shrinkage because stretching also occurs in the second stage.
  • a continuous process for the production of a moderately elastic crimp yarn from unstretched synthetic filaments by the false-twist method has now been found in which the unstretched synthetic filaments are initially subjected to continuous full stretching under heat under a slight false-twist, immediately afterwards are subjected to false-twist crimping under heat in the opposite direction and when wound up in the absence of tension.
  • the machine settings, the temperature and the twist in the two treatment stages are maintained so that after stretching in the first stage the stretched yarn shows limited crimp elasticity, for example in the S-direction, and after the second stage shows the required higher crimp elasticity in the opposite direction, for example in Z-direction, with minimal residual shrinkage.
  • twists in the opposite direction during stretching in the first stage obviates the disadvantage of irregularities in the yarn which accumulate and also eliminates any tendency towards twisting in the completed crimp yarn.
  • the twists and temperatures of the two stages are adapted to one another so that, instead of being reduced, the crimp elasticity is increased. (See FIGS. 1 and 2 curve I shrinkage due to crimping, curve 11 shrinkage, curve III shrinkage in steam, according to Melliand Textilber. 5/66, pages 493 et seq.).
  • the yarn is continuously stretched under heat in a first stage with a slight false-twist and then in another stage is crimped under heat to the required crimp elasticity.
  • the yarn is simultaneously subjected to higher false twisting in the opposite direction.
  • the first-stage stretching is carried out with the stretching ratios normally used for synthetic filaments 1:3 to 1:6) at temperatures of from to 180 C. Twisting in the first stage can be carried out for example with a mechanical twister.
  • the degree of twisting in the first stage should amount to from 1,000 to 2,000 false twists per meter.
  • false-twist crimping is carried out with twists from 1 ,500 to 3,000 false twists per meter for deniers of from 200 to 50 dtex at temperatures of from to 180 C.
  • the lead is advantageously between 2 and 8 percent and the relaxation during winding between 5 and 15 percent.
  • This process represents an advance in that by virtue of the process it is possible to obtain a moderately elastic crimp yarn with minimal residual shrinkage without any tendency towards twisting in a single operation from an unstretched material. Filaments of high molecular weight polyamides and high molecular weight linear polyesters are particularly suitable for the process.
  • the process is easy to carry out.
  • the fabrics can be uniformly dyed because the ring and spindle rail movements which occur during texturing from cops can no longer occur because the material is continuously stretched, treated and wound up to cylindrical cheeses.
  • EXAMPLE 1 A filament of poly-e-caprolactam dtex with 18 individual filaments) is stretched in a ratio of 1:3.14 in a heating tube at a temperature of C and by means of a twister has 1,400 false twists per meter (T/m) imparted to it in the S-direction during stretching. It is then subjected to false-twist crimping in the Z-direction in the same operation in a false-twist crimping stage under the usual texturing conditions (2,200 twists at C), the lead mounting to 2 percent. The filament thus stretched and crimped in two stages is wound up under 12 percent relaxation. The yarn obtained is used for a circular knit fabric dyed and finished individually. The crimped filament has a crimp shrinkage of from 30 to 35 percent, shrinkage of 14 percent and a residual shrinkage of approximately 3 percent. It has no tendency towards twisting and can be processed like a monofilament.
  • EXAMPLE 2 For use in the production of ladies stockings, a polye-caprolactam filament (40 dtex with nine individual filaments) is stretched in a ratio of 123.14 at 120 C, initially twisted in the S-direction with 1,800 twists per meter, crimped in a second stage in the conventional manner by the false-twist method with 3,000 twists in the Z-direction at 160 C and with a 2 percent lead and then wound up under 8 percent relaxation.
  • the filament thus produced has a crimp shrinkage of around 50 percent and a residual shrinkage of 4 percent.
  • the filament has no tendency towards twisting and can be processed like a monofilament in the welt.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US58820A 1969-08-07 1970-07-28 Process for the production of moderately elastic crimp yarns Expired - Lifetime US3685276A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691940183 DE1940183A1 (de) 1969-08-07 1969-08-07 Verfahren zur Herstellung von maessig elastischen Kraeuselgarnen

Publications (1)

Publication Number Publication Date
US3685276A true US3685276A (en) 1972-08-22

Family

ID=5742165

Family Applications (1)

Application Number Title Priority Date Filing Date
US58820A Expired - Lifetime US3685276A (en) 1969-08-07 1970-07-28 Process for the production of moderately elastic crimp yarns

Country Status (8)

Country Link
US (1) US3685276A (de)
AT (1) AT320130B (de)
BE (1) BE754453A (de)
CH (1) CH497552A (de)
DE (1) DE1940183A1 (de)
FR (1) FR2056747A5 (de)
GB (1) GB1325046A (de)
NL (1) NL7011298A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816994A (en) * 1973-04-11 1974-06-18 Burlington Industries Inc False-twist texturing process with improved feed yarns and feed rates
US3910027A (en) * 1972-12-05 1975-10-07 Bayer Ag Process for the simultaneous stretch texturing of filament yarn

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041814A (en) * 1960-07-07 1962-07-03 Heberlein Patent Corp Apparatus for producing crimped yarn
US3137119A (en) * 1961-06-14 1964-06-16 Chavanoz Moulinage Retorderie Process for the production of high bulk yarns
US3318083A (en) * 1963-05-10 1967-05-09 Klinger Mfg Co Ltd Process for false twist-crimping yarn
US3503201A (en) * 1967-06-06 1970-03-31 Bayer Ag Process for the production of elastic crimped filaments
US3543505A (en) * 1968-02-20 1970-12-01 Heberlein Patent Corp Process for relaxing internal tensions of textured synthetic yarns

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041814A (en) * 1960-07-07 1962-07-03 Heberlein Patent Corp Apparatus for producing crimped yarn
US3137119A (en) * 1961-06-14 1964-06-16 Chavanoz Moulinage Retorderie Process for the production of high bulk yarns
US3318083A (en) * 1963-05-10 1967-05-09 Klinger Mfg Co Ltd Process for false twist-crimping yarn
US3503201A (en) * 1967-06-06 1970-03-31 Bayer Ag Process for the production of elastic crimped filaments
US3543505A (en) * 1968-02-20 1970-12-01 Heberlein Patent Corp Process for relaxing internal tensions of textured synthetic yarns

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910027A (en) * 1972-12-05 1975-10-07 Bayer Ag Process for the simultaneous stretch texturing of filament yarn
US3816994A (en) * 1973-04-11 1974-06-18 Burlington Industries Inc False-twist texturing process with improved feed yarns and feed rates

Also Published As

Publication number Publication date
GB1325046A (en) 1973-08-01
AT320130B (de) 1975-01-27
BE754453A (fr) 1971-01-18
NL7011298A (de) 1971-02-09
CH497552A (de) 1970-10-15
DE1940183A1 (de) 1971-03-04
FR2056747A5 (de) 1971-05-14

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