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

Process for the production of moderately elastic crimp yarns Download PDF

Info

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
Authority
US
United States
Prior art keywords
false
stretching
twist
filaments
stage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US58820A
Inventor
Herbert Scherzberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Application granted granted Critical
Publication of US3685276A publication Critical patent/US3685276A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • DTEXTILES; PAPER
    • D02YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02GCRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02Producing 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
    • D02G1/0206Producing 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
    • D02G1/0226Producing 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.

Landscapes

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

Abstract

A process for the continuous production of moderately elastic crimp yarn from unstretched synthetic filaments by false-twist crimping, wherein the unstretched synthetic filaments are initially fully stretched under heat with a slight false-twist, after which they are subjected in the same operation to falsetwist crimping under heat in the opposite direction and wound up under relaxation. Stretching is carried out at stretching ratios of from 1:3 to 1:6 and at temperatures of from 80* to 180* C.

Description

United States Patent Scherzberg 1 1 Aug. 22, 1972 [54] PROCESS FOR THE PRODUCTION OF MODERATELY ELASTIC CRIMP YARNS [72] Inventor: Herbert Scherzberg, Dormagen,
Germany [73] Assignee: Farbenfabriken Bayer Aktiengesellschaft, Leverkusen, Germany [22] Filed: July 28, 1970 [21] Appl. No.1 58,820
[30] Foreign Application Priority Data Aug. 7, 1969 Germany "P 19 40 183.3
521 U.S.C1. ..57/157TS [51] Int. Cl. ..D02g 1/02 [58] Field of Search ..57/140, 34 HS, 157, 157 TS, 57/157 MS, 36, 51; 28/72 [56] References Cited UNITED STATES PATENTS 3,503,201 3/1970 Sherzberg et a1 ..57/157 3,543,505 12/1970 Stutz ..57/157 3,318,083 5/1967 Gilchrist ..57/34 X 3,137,119 6/1964 Crouzet ..57/157 3,041,814 7/1962 Held ..57/34 Primary ExaminerDonald E. Watkins Attorney-Plurrnley & Tyner [5 7] ABSTRACT 7 Claims, 2 Drawing Figures PATENTED M1822 1972 sum 2 or z INVENTOR.
HE-RBE RT SCHERZ BE RG PROCESS FOR THE PRODUCTION OF MODERATELY ELASTIC CRIMP YARNS 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.
It is known in connection with synthetic filaments that, to produce moderately elastic crimp yarns by the false-twist method for use in the manufacture of outer clothing, the elasticity of the highly elastic crimp yarns can be reduced by subsequent heat treatment of the filament optionally in the presence of tension.
It is also known that in cases where unstretched synthetic material is used the stretching operation 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. Finally, it is also known that 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 processes in which crimp elasticity is subsequently reduced have when effecting reducing without tension in strands, muffs or winding rings the disadvantage of a considerable increase in production costs through a series of additional operations, Furthermore, in cases where elasticity is reduced in the presence of tension in the moving filament or even in the bobbin, they have the disadvantage of high residual shrinkage which has an adverse effect upon finishing and dyeing insofar as it is not possible to obtain optimum make-up widths or, in the case of textured fabrics, for example relief fabrics, to obtain the full structure or texture because the fabric undergoes excessive shrinkage when washed during dyeing and has to be subsequently stretched under excessive tension over the tenter frame during finishing. In addition to these disadvantages affecting subsequent reduction of elasticity, there is the further disadvantage in cases where stretching is combined with crimping that, with the yarn thicknesses in excess of 90 den which are required for outer clothing, an irregular yarn is obtained because the outer capillary filaments are stretched to a greater extent and crimped to a lesser extent than the inner capillary filaments due to the high twist required for crimping during the stretching operation.
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. Twisting 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.).
Accordingly, 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. In this second stage, 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. In the second stage, 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.
What we claim is:
1. A process for the continuous production of crimp yarn from synthetic filaments wherein the synthetic filaments are:
I. fully stretched under heating at temperatures of above 80 C with a false-twist of below 2,000 false twist per meter;
II. subjected without further stretching in the same working stage to false-twist crimping under heat at temperatures of above C in the opposite direction; and
[I]. wound up under relaxation.
2. A process as claimed in claim 1, wherein stretching is carried out at a stretching ratio of from 1 :3 to 1:6.
3. A process as claimed in claim 1, wherein the stretching is carried out at a temperature of from 80 to C.
4. A process as claimed in claim 1, wherein the degree of twisting in stage (1) is from 1,000 to 2,000 false-twists per meter.
5. A process as claimed in claim 1, wherein the degree of twisting in stage (II) is from 1,500 to 3,000 false-twiste per meter.
6. A process as claimed in claim I, wherein the synthetic filaments are filaments of a high molecular weight polyamide.
7. A process as claimed in claim 1, wherein the synthetic filaments are filaments of a high molecular weight linear polyester.

Claims (7)

1. A process for the continuous production of crimp yarn from synthetic filaments wherein the synthetic filaments are: I. fully stretched under heating at temperatures of above 80* C with a false-twist of below 2,000 false twist per meter; II. subjected without further stretching in the same working stage to false-twist crimping under heat at temperatures of above 120* C in the opposite direction; and III. wound up under relaxation.
2. A process as claimed in claim 1, wherein stretching is carried out at a stretching ratio of from 1:3 to 1:6.
3. A process as claimed in claim 1, wherein the stretching is carried out at a temperature of from 80* to 180* C.
4. A process as claimed in claim 1, wherein the degree of twisting in stage (1) is from 1,000 to 2,000 false-twists per meter.
5. A process as claimed in claim 1, wherein the degree of twisting in stage (II) is from 1,500 to 3,000 false-twiste per meter.
6. A process as claimed in claim 1, wherein the synthetic filaments are filaments of a high molecular weight polyamide.
7. A process as claimed in claim 1, wherein the synthetic filaments are filaments of a high molecular weight linear polyester.
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 (en) 1969-08-07 1969-08-07 Process for the production of moderately elastic crimped yarns

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 (en)
AT (1) AT320130B (en)
BE (1) BE754453A (en)
CH (1) CH497552A (en)
DE (1) DE1940183A1 (en)
FR (1) FR2056747A5 (en)
GB (1) GB1325046A (en)
NL (1) NL7011298A (en)

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

Similar Documents

Publication Publication Date Title
US3438193A (en) Composite yarn and its manufacturing method
US3596459A (en) Process of producing a nonstretch or low-stretch composite yarn of super high bulkiness
US3991548A (en) Composite yarns
US2711627A (en) Method of producing composite yarn
US3540204A (en) Method for manufacturing an improved elastic yarn covered with multifilament
US3807162A (en) Covered elastic yarn
US3175351A (en) Method for making bulked continuous filament yarns
US3921382A (en) Method of making a covered elastic yarn
US3115744A (en) Process for the manufacture of crimped yarn
US3380244A (en) Core-spun elastic yarn product and process
US3685276A (en) Process for the production of moderately elastic crimp yarns
JP4547792B2 (en) Polyester false twist covered elastic yarn and method for producing the same
US3423924A (en) Method of false-twisting thermoplastic yarn
US3608295A (en) Highly elasticized fibrous composite and a method for manufacturing the same
US3698177A (en) Texturizing yarn, process and product
US3611701A (en) Process for the production of dyed crimped yarns
US3365875A (en) Composite elastic yarns
US3382658A (en) Apparatus for manufacturing textured filament yarns
US3579764A (en) Process for producing textured yarns
US3483690A (en) Bulky plied yarn
US3653198A (en) Method for manufacturing a plied yarn
US3503201A (en) Process for the production of elastic crimped filaments
US3774388A (en) Method for producing synthetic torque yarns
US3025661A (en) Coiled textile strand and method of producing same
US3399524A (en) Process for the preparation of low torque crimped textile yarn