US3846966A - Twisting of textile filaments - Google Patents

Twisting of textile filaments Download PDF

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Publication number
US3846966A
US3846966A US00301107A US30110772A US3846966A US 3846966 A US3846966 A US 3846966A US 00301107 A US00301107 A US 00301107A US 30110772 A US30110772 A US 30110772A US 3846966 A US3846966 A US 3846966A
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US
United States
Prior art keywords
yarn
twist
deformable
imparting
hardness
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Expired - Lifetime
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US00301107A
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English (en)
Inventor
G Peacock
A Dobson
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Platt International Ltd
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Platt International Ltd
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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
    • D02G1/04—Devices for imparting false twist
    • D02G1/08—Rollers or other friction causing elements

Definitions

  • a method of false twisting synthetic filament yarn wherein the yarn runs in a path in which itcontacts in succession two moving deformable twistimparting surfaces of different hardnesses to false twist the yarn.
  • a false twisting arrangement for synethetic filament yarn comprising two deformable twist imparting surfaces of different hardnesses which, in use, are contacted in succession by a running synthetic filament yarn and are'so arranged to move to impart false twist to the yarn.
  • FIG. 1 is a front elevation of a false twist unit
  • FIG. 2 is a section on the lines lI-II of FIG. 1, showing a first form of false twist arrangement according to the invention
  • FIG. 3 is a cross-sectional view of a second form of false twist arrangement according to the invention.
  • the false twist unit comprises a frame 2 which rotatably supports upper and lower rotary twist bushes 4 and 8 respectively.
  • the bushes 4, 8 are each provided with a pulley portion 3 and are'arranged to be driven in mutually opposite directions by a belt drive 5 which passes round the pullies 3, a motor drive pulley 7 and a spring loaded jockey pulley 19 and is driven by a motor 1.
  • the bushes 4 and S' are formed as hollow steel cylinders 11 and are provided with annular rebates at their ends which receive deformable polyurethane rings 6a, 6b, 6c, 6d each of quadrant section and 80 arranged that their curved surfaces form shaped mouths for the bushes.
  • the Shore hardness of the ring 612 is 2 greater than that of ring 6a, that of ring 6c 2 greater than that of ring 6b and that of ring 6a 2 greater than that .of ring 6c.
  • the rings 6a, 6b, 6c, 6d are colour coded according to theirhardness for easy identification.
  • Each hollow steel cylinder 11 is mounted in an air bearing which, as best seen in FIG. 2, comprises three annular metal rings 10, 12, 13 which surround the hollow metal cylinder 11.
  • the radial walls 14 of the middle ring 12 are roughened to provide a passage for air to pass from a radially outer annular chamber 15 to aradially inner annular gap between the cylinder 11 and the rings 10, 12, 13.
  • Air is supplied to the chamber 15 from a source of air under pressure through pipes 16 in the frame 2.
  • the front of the frame 2 is covered by a plate 30 which is provided with two holes which the twist bushes 4, 8.
  • thermoplastic continuous filament yarn 17 is drawn through the two twist bushes 4 and 8 in the direction indicated by the arrow 9 in FIG. 2.
  • the yarn 17 is at its lowest tension as it enters the upper twist bush 4 and contacts the surface of the least hard ring 6a.
  • the tension''d yarn 17 deforms the surface of the ring 60 and friction between the surface of the ring 6a and the yarn 17 inserts twist into the yarn 17 which the second hardest and thefinally contacted surface register with place.
  • the yarn passes diagonally across the second busy 8 to contact the surface of the hardest ring 6d before leaving the second bush 8.
  • the tension of the yarn 17 increases as it'passes through'the two twist bushes 4 and 8 and the yarn 17 is at maximum tension as it leaves the'lower bush 8.
  • the upper and lower twist bushes 20, 21 are rotatably mounted in the frame 22in the manner described with reference to FIGS. land 2.
  • FIGS. 1 and 2 and to FIG. 3 bear. the same reference numerals are not-described in detail.
  • the upper and lower bushes 20, 21 are'formedas hollow steel cylinders 23 which receive cylindrical deformable polyurethane sleeves 24a, 24b. whose wall thickness increases axiallyfrom the ends to an axially central portion of maximum thickness.
  • the Shore-hard ness of the upper sleeve 24a is less than the Shore hardness of the lower sleeve 24b.
  • the two twist bushes 20, 21 are rotated in mutually opposite directions by the belt drive 5.
  • a thermoplastic continuous filament yarn 25 is drawnv through the two twist bushes 20, 21 in thedirection indicated by the arrow 26.
  • the yarn 25 is at its lowest tension as it enters the upper twist bush 20 and contacts the less hard sleeve 24a.
  • the friction between the insert 24a and the yarn 25 inserts twist in to the yarn 25 which hen Pas lx. across he. 1 21 29 t onta the surface of the less hard sleeve 24a where twist is also inserted.
  • the yarn 25 passes diagonally across the second bush 21 to contact the surface of the harder sleeve 24b once again to insert twist.
  • the tension of the yarn 25 increases as it 'passes through the twist bushes 20, 21 and the yarn is at maximum tension as it leaves the lower bush 21.
  • each sleeve 24a, 24b may be formed in two cylindrical parts which are in end-toend abutment.
  • the parts are preferably of differing hardness and arranged so that the first surface of the upper sleeve 24a contacted by the yarn 25 is the least hard surface, the next contacted surface the third hardest, the first contacted surface of the lower sleeve 24b,
  • deformable twist imparting-surfaces mounted otherwise.
  • deformable twist imparting surfaces of different hardnesses may be mounted on the peripheries of two stacks of rotatable discs arranged with their axes parallel.
  • the discs rotate in mutually opposite directions with the yarn following a serpentine path in contact alternately with the peripheries of the two stacks of discs.
  • deformable twist-imparting surfaces described above with reference to the drawings are made of deformable polyurethane. It will be appreciated, however, that other deformable materials such as rubber and suitable elastomers may also be used.
  • twist assembly described with reference to the drawings is particularly suitable for incorporation in a texturing machine as described in British Patent Application No. 61237/69.
  • a method of false twisting a running synthetic filament yarn comprising the step of contacting the running yarn in succession with two moving deformable twist-imparting surfaces of different hardness to false twist the yarn, the second contacted surface. being of greater hardness than the first contacted surface.
  • a false twisting arrangement for synthetic filament yarn comprising two deformable twist-imparting surfaces of different hardness, the yarn contacting the less hard surface before contacting the harder surface and drive means for moving said surfaces to false twist the yarn.
  • rotary twisting element comprises a twist bush and wherein the deformable twist-imparting surfaces comprise a ring at each end of the bush which, in use, contacts a yarn running through the bush.
  • each ring is of uniform hardness throughout.
  • rotary twisting element comprises a twist bush and wherein the further deformable twist imparting surfaces comprises two further rings one at each end of the bush and which, in use, contact the yarn running through the bush.
  • each ring is formed of an elastomeric. material.
  • each ring is of quadrant cross-section.
  • each rotary twisting element comprises a twist bush and wherein each deformable friction imparting surface is formed as an annular sleeve mounted in the bush which contacts the yarn running through the bush.
  • each sleeve is cylindrical with a wall thickness which increases from the ends of the sleeve to a maximum thickness at the axial mid-point of the sleeve.
  • a method of false twisting a running synthetic filament yarn comprising the steps of contacting the running yarn in succession with two moving deformable twist-imparting surfaces of different hardness to false twist the yarn, and arranging the yarn to apply a greater force to the harder of the two surfaces and a lesser force to the less hard of the two surfaces.
  • a false twisting arrangement for a running synthetic filament yarn comprising two deformable twist-v imparting surfaces of different hardness positioned with the running yarn contacting the less hard surface with'less force and the harder surface with greater force, and drive means for moving said surfaces to false twist the running yarn.
US00301107A 1971-10-29 1972-10-26 Twisting of textile filaments Expired - Lifetime US3846966A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5045471A GB1395888A (en) 1971-10-29 1971-10-29 Twisting of textile filaments

Publications (1)

Publication Number Publication Date
US3846966A true US3846966A (en) 1974-11-12

Family

ID=10455950

Family Applications (1)

Application Number Title Priority Date Filing Date
US00301107A Expired - Lifetime US3846966A (en) 1971-10-29 1972-10-26 Twisting of textile filaments

Country Status (7)

Country Link
US (1) US3846966A (fr)
JP (1) JPS4850052A (fr)
CH (1) CH557897A (fr)
DE (1) DE2252923A1 (fr)
FR (1) FR2158023B1 (fr)
GB (1) GB1395888A (fr)
IT (1) IT970809B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948034A (en) * 1973-04-27 1976-04-06 Imperial Chemical Industries Limited False twisting filamentary yarns
US4034548A (en) * 1974-05-10 1977-07-12 Bayer Aktiengesellschaft Process for the production of stretch-textured yarns with improved properties

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936570A (en) * 1956-11-16 1960-05-17 British Nylon Spinners Ltd Twisting of textile filaments
US2936567A (en) * 1955-07-19 1960-05-17 British Nylon Spinners Ltd Twisting of textile filaments
US3066473A (en) * 1960-03-23 1962-12-04 Maeda Yutaka Apparatus and method for imparting twist and crimp to textile yarns
US3535866A (en) * 1968-02-29 1970-10-27 Nippon Rayon Kk Process and apparatus for producing crimped yarns
US3537250A (en) * 1968-07-05 1970-11-03 Alexander W P Mackintosh Means for imparting twist to yarns
US3656288A (en) * 1966-09-03 1972-04-18 Klinger Mfg Co Ltd False twist texturizing method and apparatus
US3656290A (en) * 1970-02-19 1972-04-18 Spinner Oy Curling sleeve

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3035397A (en) * 1957-01-07 1962-05-22 Hindley Brothers Ltd Belt false twisting apparatus for crimping of textile yarns
US3451206A (en) * 1967-01-26 1969-06-24 Alexander W P Mackintosh Machines for imparting twist to yarns

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936567A (en) * 1955-07-19 1960-05-17 British Nylon Spinners Ltd Twisting of textile filaments
US2936570A (en) * 1956-11-16 1960-05-17 British Nylon Spinners Ltd Twisting of textile filaments
US3066473A (en) * 1960-03-23 1962-12-04 Maeda Yutaka Apparatus and method for imparting twist and crimp to textile yarns
US3656288A (en) * 1966-09-03 1972-04-18 Klinger Mfg Co Ltd False twist texturizing method and apparatus
US3535866A (en) * 1968-02-29 1970-10-27 Nippon Rayon Kk Process and apparatus for producing crimped yarns
US3537250A (en) * 1968-07-05 1970-11-03 Alexander W P Mackintosh Means for imparting twist to yarns
US3656290A (en) * 1970-02-19 1972-04-18 Spinner Oy Curling sleeve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948034A (en) * 1973-04-27 1976-04-06 Imperial Chemical Industries Limited False twisting filamentary yarns
US4034548A (en) * 1974-05-10 1977-07-12 Bayer Aktiengesellschaft Process for the production of stretch-textured yarns with improved properties

Also Published As

Publication number Publication date
JPS4850052A (fr) 1973-07-14
IT970809B (it) 1974-04-20
CH557897A (de) 1975-01-15
GB1395888A (en) 1975-05-29
FR2158023A1 (fr) 1973-06-08
FR2158023B1 (fr) 1975-01-03
DE2252923A1 (de) 1973-05-10

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