US3543505A - Process for relaxing internal tensions of textured synthetic yarns - Google Patents

Process for relaxing internal tensions of textured synthetic yarns Download PDF

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Publication number
US3543505A
US3543505A US799676A US3543505DA US3543505A US 3543505 A US3543505 A US 3543505A US 799676 A US799676 A US 799676A US 3543505D A US3543505D A US 3543505DA US 3543505 A US3543505 A US 3543505A
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Prior art keywords
yarn
twist
twisting
yarns
heat
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Expired - Lifetime
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US799676A
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English (en)
Inventor
Otto Titus Stutz
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Heberlein Patent Corp
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Heberlein Patent Corp
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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 treatment of synthetic yarns, and more particularly, to a process for relaxing tensions in such yarns which have been textured by high-twisting same, setting same while in the high twisted condition, untwisting and again heating same.
  • my invention a process for relaxing internal tensions in synthetic textile yarns which have been textured by temporary high-twisting and heat setting while in the high-twisted state, and the clasticity of which has been reduced by a second heat treatment, characterized in that the yarn is submitted to a further temporary high-twisting but in a direction opposite to that of the first high-twisting and without further heat treatment.
  • the second temporary high-twist may be imparted while the yarn is in stretched condition.
  • the amount of stretch is selected such that no slip occurs in the twister while breakage is kept to a minimum.
  • the process of the present invention is especially suitable for the treatment of textured synthetic multifilament yarns consisting of polyamides, e.g. polyhexamethylene adipamide (nylon 66) or of condensates of epsilon-aminocaproic acid or of ll-aminoundecanoic acid (nylon 6), and of polyesters (polyethylene glycol terephthalate), materials of vinylic base (polyacrylonitrile), or polyolefines. Yarns having total titers of between and 200 denier are preferred.
  • FIG. 1 is a schematic represenation of equipment which may be employed to perform the process of the invention in one of its aspects;
  • FIG. 2 is a schematic representation of equipment which may be employed to perform the process in another of its aspects.
  • the texturization of the yarns may be effected on one of the known false-twist machines.
  • the second heat-setting may be continuously effected directly following the falsetwist operation by using a false-twisting device in which a second-heating device has been provided following the twist imparter.
  • the second heat setting may also be effected in such a way that the yarns are wound onto spools under reduced tension after the false-twist operation and steamed under pressure in an autoclave.
  • the further temporary high-twisting effected following the second heat treatment may also be effected continuously in direct continuation of the first false-twist operation and of the further heat-setting.
  • the yarn 2 coming from the bobbin 1 subsequently runs through a first pair of delivery rollers 3, a heating device 4, a false twist imparter 5 which twists the yarn back through the heating device 4, a second pair of delivery rollers 6, a second heating device 7, a third pair of delivery rollers 8, a second twist imparter 9, a fourth pair of delivery rollers 10 and finally reaches the windup device 11.
  • the heating devices 4 and 7 preferably consist of heated contact surfaces, the twist imparters 5 and 9 rotate in opposite directions, and the rotating speed of the pair of delivery rollers 8 is approximately 10 to 15 percent lower than the speed of the pair of delivery rollers 6, so that the yarn can shrink accordingly during the second heat-setting.
  • the second heat-setting is efiected by steaming of the yarn bobbins in an autoclave, it is useful to combine the second temporary high-twisting with a winding operation, i.e., to effect the second false-twist operation on a winding frame.
  • the textured yarns 14 and 15 having been delivered from the spools 12, 13, one of which has been temporarily high-twisted in S direction and the other in Z direction may be fed to the false-twist imparters 17, 18, which are driven in opposite direction by means of the belt 16, i.e., the twist imparter 17 in Z direction and the twist-imparter 18 in S direction.
  • the tWo yarns 14 and 15 are then separately wound onto the bobbins 19 and 20, respectively.
  • either a twist imparter used in the usual false-twist texturing machines such as a twist tube or a friction twist imparter may be used.
  • the thread-forwarding means of the machine are thus arranged that the yarn undergoes a 2 percent shrinkage during false-twisting and heat-setting.
  • the yarn is then wound up by feeding to the windup device at a speed which exceeds the peripheral speed of the same by 20 percent. Thereafter, the yarn is steamed in the wound-up state in an autoclave at a pressure of approximately 2.5 atmospheres gauge.
  • the yarn is then temporarily high-twisted to 2750 turns per meter by means of a second false-twist device, the thread-feeding devices of the machine being so arranged that the yarn undergoes stretching of ap proximately 3.5 percent.
  • the so treated yarn presents a reduced elasticity and simultaneously the internal tensions are substantially fully relaxed.
  • a multifilament yarn consisting of polyethylene glycol terephthalate having a titer of 150 denier, consisting of 30 filaments and having an initial twist of 15 to 20 turns per meter in S direction, is temporarily high-twisted to approximately 2000 turns per meter in Z direction by means of the false-twist device shown in FIG. 1, i.e., by means of the twist-imparter 5, and heat-set in the hightwisted state during 0.65 second by hot air contained in the heating device 4. During false-twisting and heat setting, shrinkage of the yarn by approximately 4 percent takes place. The yarn is then subjected to a second heatsetting at 190 C.
  • the yarn is temporarily high-twisted to 2400 turns per meter in S direction, whereby the thread-forwarding devices 8 and are so arranged that the yarn undergoes stretching of approximately 4 percent.
  • the thus obtained textured yarn presents reduced elasticity and simultaneously the internal tensions are substantially fully relaxed.
  • EXAMPLE III A :multifilament yarn consisting of nylon 66 having a titer of approximately 100 denier, consisting of 34 filaments and having an initial twist of approximately between and turns per meter Z is treated by means of a false-twist device according to FIG. 1, wherein a first temporary high-twisting up to 2600 turns per meter and a first heat-setting by hot air of 210 C. is eifected under shrinkage of the yarn by approximately 2 percent. The second heat setting of the yarn is effected by means of the contact surface 7 heated to 225 0, whereby the yarn undergoes shrinkage of approximately 12 percent. The yarn is then subjected to a second high-twisting operation to 2.800 turns per meter in Z direction thereby undergoing a stretch of approximately 9 percent. The thus obtained textured yarn presents reduced elasticity and simultaneously the internal tensions are substantially fully relaxed.
  • a process for the relaxation of the internal tensions of synthetic textile yarns which have been textured by temporary high-twisting and heat-setting in the hightwisted state, the elasticity of which has been reduced by a subsequent second heat-setting operation characterized in that the textile yarn is subjeced, after the temporary high-twisting, to a further temporary high-twisting in opposite direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US799676A 1968-02-20 1969-02-17 Process for relaxing internal tensions of textured synthetic yarns Expired - Lifetime US3543505A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH239468A CH483504A (de) 1968-02-20 1968-02-20 Verfahren zum Ausgleich des inneren Spannungszustandes bei einem texturierten synthetischen Textilgarn

Publications (1)

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US3543505A true US3543505A (en) 1970-12-01

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US799676A Expired - Lifetime US3543505A (en) 1968-02-20 1969-02-17 Process for relaxing internal tensions of textured synthetic yarns

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US (1) US3543505A (en))
BE (1) BE728073A (en))
CH (2) CH239468A4 (en))
DE (1) DE1908174A1 (en))
ES (1) ES363444A1 (en))
FR (1) FR2002253A1 (en))
GB (1) GB1217124A (en))
NL (1) NL6901688A (en))

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3685276A (en) * 1969-08-07 1972-08-22 Bayer Ag Process for the production of moderately elastic crimp yarns
US3777469A (en) * 1971-08-03 1973-12-11 R Spurgeon Texturing yarns by false twisting
US3826075A (en) * 1970-12-19 1974-07-30 Teijin Ltd Process for producing a bulky yarn
US4263778A (en) * 1978-06-13 1981-04-28 Fiber Industries, Inc. Stabilized stretch yarns for stretch wovens
US4803835A (en) * 1986-03-25 1989-02-14 Andre Varga Method for modifying a yarn
US20090258744A1 (en) * 2003-01-07 2009-10-15 Forbo Siegling, Llc Belt

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2475922A (en) * 1945-02-07 1949-07-12 Stockly Johann Process and device for producing wool-like rayon filaments
US3091912A (en) * 1957-04-19 1963-06-04 Leesona Corp Method of processing stretch yarn and yarns produced thereby
US3137119A (en) * 1961-06-14 1964-06-16 Chavanoz Moulinage Retorderie Process for the production of high bulk yarns
US3165881A (en) * 1960-02-03 1965-01-19 Moncuit Yves De Production of high bulk yarns
US3166881A (en) * 1963-07-22 1965-01-26 Chavanoz Moulinage Retorderie Apparatus and process for the manufacture of highly crimped yarns by false twist
US3318083A (en) * 1963-05-10 1967-05-09 Klinger Mfg Co Ltd Process for false twist-crimping yarn
US3367096A (en) * 1965-06-07 1968-02-06 Alamance Ind Inc Apparatus for false-twisting and plying yarns
US3438190A (en) * 1967-08-29 1969-04-15 Allied Chem Nontorque bulk yarn and process of forming same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2475922A (en) * 1945-02-07 1949-07-12 Stockly Johann Process and device for producing wool-like rayon filaments
US3091912A (en) * 1957-04-19 1963-06-04 Leesona Corp Method of processing stretch yarn and yarns produced thereby
US3165881A (en) * 1960-02-03 1965-01-19 Moncuit Yves De Production of high bulk yarns
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
US3166881A (en) * 1963-07-22 1965-01-26 Chavanoz Moulinage Retorderie Apparatus and process for the manufacture of highly crimped yarns by false twist
US3367096A (en) * 1965-06-07 1968-02-06 Alamance Ind Inc Apparatus for false-twisting and plying yarns
US3438190A (en) * 1967-08-29 1969-04-15 Allied Chem Nontorque bulk yarn and process of forming same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3685276A (en) * 1969-08-07 1972-08-22 Bayer Ag Process for the production of moderately elastic crimp yarns
US3826075A (en) * 1970-12-19 1974-07-30 Teijin Ltd Process for producing a bulky yarn
US3777469A (en) * 1971-08-03 1973-12-11 R Spurgeon Texturing yarns by false twisting
US4263778A (en) * 1978-06-13 1981-04-28 Fiber Industries, Inc. Stabilized stretch yarns for stretch wovens
US4803835A (en) * 1986-03-25 1989-02-14 Andre Varga Method for modifying a yarn
US20090258744A1 (en) * 2003-01-07 2009-10-15 Forbo Siegling, Llc Belt

Also Published As

Publication number Publication date
CH483504A (de) 1969-09-15
GB1217124A (en) 1970-12-31
BE728073A (en)) 1969-08-07
CH239468A4 (en)) 1969-09-15
FR2002253A1 (en)) 1969-10-17
ES363444A1 (es) 1970-12-16
DE1908174A1 (de) 1969-09-11
NL6901688A (en)) 1969-08-22

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