US3564833A - Friction false twisting - Google Patents

Friction false twisting Download PDF

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Publication number
US3564833A
US3564833A US792981*A US3564833DA US3564833A US 3564833 A US3564833 A US 3564833A US 3564833D A US3564833D A US 3564833DA US 3564833 A US3564833 A US 3564833A
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US
United States
Prior art keywords
twist
yarn
friction false
false twisting
pin
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
US792981*A
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English (en)
Inventor
Roy Spencer Holliss
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Application granted granted Critical
Publication of US3564833A publication Critical patent/US3564833A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D02G1/0266—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 false-twisting machines

Definitions

  • Such twist bleeding which is randomly distributed within yarn from one processing position, and between yarns from different processing positions, is evident as an undesirable short-term flashiness (dark streaks) in the resultant fabric, e.g. a weft-knitted fabric.
  • the amount of twist trapping is critical, because too little will not assist in overcoming the defect of twist bleeding while too much can have the effect of virtually eliminating the bulk from the yarn.
  • a twist barrier comprising a stationary pin is so positioned with respect to the outlet end of a friction false twist tube with which the yarn being false twisted makes frictional contact and to guide means around or through which the yarn is withdrawn from said twist tube, that the yarn may be partially wrapped around said pin with an arc of contact therewith of between 45 and 180 and that contact with said pin is made by the yarn immediately after it has left contact with said outlet end of said twist tube.
  • the invention also provides an apparatus for operating the above process of friction false twisting.
  • the stationary pin is cylindrical and has a hard wear-resistant surface. Ceramic, bright chrome and matt chrome surfaces have proved satisfactory.
  • the stationary pin should be positioned as closely to the outer periphery of the outlet end of the twist tube as is possible consonant with remaining free from contact therewith and with allowing threading-up of the twist tube and pin to be accomplished readily. A distance of as little' as inch has proved satisfactory; but even as close a distance as 3 inches has proved to be relatively ineffective in minimising twist bleeding.
  • the diameter of a cylindrical pin is not too critical, within the range of realistic diameters; but a small diameter, for example inch, is preferred to a larger one, for example inch.
  • EXAMPLE I being composed of polyurethane having a inch inner diameter, flaring to an outer diameter of 2 inches, and short hardness 92 and 88 respectively.
  • the heater upstream of the twist tube was at a temperature of 225 C., and the yarn was positively fed into and withdrawn from the twist zone by draw rolls and take-out rolls, respectively, so as to underfeed the yarn through the zone at an underfeed of 3.3% and a concomitant tension of 19 grams.
  • the tension downstream of the twist tube was 50 grams.
  • a stationary, cylindrical matt chrome pin of inch diameter was positioned at a distance of inch from the outer periphery of the polyurethane end-portion of the twist tube, such that the yarn made an arc of contact of 90 around it end route to the take-out roll.
  • the yarn so produced was satisfactorily bulked and gave no indication of twist bleeding, as evinced by fiashiness, when made into a weft-knitted fabric.
  • the yarn so produced was satisfactorily bulked and gave no indication of twist bleeding, as evinced by flashiness, when made into a weft-knitted fabric.
  • yarns Y and Y are led slightly separated away from a heater (not shown and by which the twist is set) through guides 1, 3 to the inlet end of two contra-rotating twist tubes 5, 7. As indicated, the yarns pass diagonally through the hollow twist tubes, making contact at each end thereof with a bush of polyurethane, the outlet ones of which are shown at 9, 11.
  • a twist barrier comprising a stationary cylindrical pin is so positioned at a distance of the order of inch from the periphery of the outlet end of a friction false twist tube with which the yarn being false twisted makes frictional contact and to guide means around or through which the yarn is withdrawn from said twist tube that the yarn may be partially wrapped around said pin with an arc of contact therewith of between and References Cited UNITED STATES PATENTS 2,936,570 5/1960 Arthur et al. 5777.4X 3,154,906 11/1964 Van Assendelft et a1. 5777,4X 3,204,396 9/1965 Poster at al. 5734 3,330,104 7/1967 Dunwoody 57-512 3,439,485 4/1969 Lloyd 57-34 DONALD E. WATKINS, Primary Examiner

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US792981*A 1968-01-30 1969-01-22 Friction false twisting Expired - Lifetime US3564833A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4777/68A GB1212393A (en) 1968-01-30 1968-01-30 Improvements in or relating to friction false twisting

Publications (1)

Publication Number Publication Date
US3564833A true US3564833A (en) 1971-02-23

Family

ID=9783624

Family Applications (1)

Application Number Title Priority Date Filing Date
US792981*A Expired - Lifetime US3564833A (en) 1968-01-30 1969-01-22 Friction false twisting

Country Status (12)

Country Link
US (1) US3564833A (de)
AT (1) AT313124B (de)
BE (1) BE727695A (de)
BR (1) BR6906009D0 (de)
CA (1) CA922182A (de)
CH (2) CH134869A4 (de)
DE (1) DE1904614A1 (de)
ES (1) ES363098A1 (de)
FR (1) FR2000984A1 (de)
GB (1) GB1212393A (de)
IE (1) IE32865B1 (de)
NL (1) NL6901157A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756006A (en) * 1970-02-19 1973-09-04 Bayer Ag False-twist arrangement
US3875734A (en) * 1972-02-08 1975-04-08 Dupeuble Jean Claude Friction false twisting device
CN107326485A (zh) * 2017-07-24 2017-11-07 重庆天泽新材料有限公司 一种初捻机生产并捻纱用分纱器及其使用方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010022446B4 (de) 2010-06-01 2015-05-07 Thomas Pfisterer Doppelschlagwerk für Teppichklopfmaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756006A (en) * 1970-02-19 1973-09-04 Bayer Ag False-twist arrangement
US3875734A (en) * 1972-02-08 1975-04-08 Dupeuble Jean Claude Friction false twisting device
CN107326485A (zh) * 2017-07-24 2017-11-07 重庆天泽新材料有限公司 一种初捻机生产并捻纱用分纱器及其使用方法

Also Published As

Publication number Publication date
BR6906009D0 (pt) 1973-05-31
GB1212393A (en) 1970-11-18
IE32865B1 (en) 1973-12-28
FR2000984A1 (de) 1969-09-19
NL6901157A (de) 1969-08-01
CH508748A (de) 1971-02-26
AT313124B (de) 1974-02-11
IE32865L (en) 1969-07-30
DE1904614A1 (de) 1970-08-13
ES363098A1 (es) 1970-11-16
CA922182A (en) 1973-03-06
BE727695A (de) 1969-07-30
CH134869A4 (de) 1971-02-26

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