US3724191A - Treatment of synthetic yarns - Google Patents

Treatment of synthetic yarns Download PDF

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Publication number
US3724191A
US3724191A US00097969A US3724191DA US3724191A US 3724191 A US3724191 A US 3724191A US 00097969 A US00097969 A US 00097969A US 3724191D A US3724191D A US 3724191DA US 3724191 A US3724191 A US 3724191A
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US
United States
Prior art keywords
yarn
guide means
over
twist
heat transfer
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Expired - Lifetime
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US00097969A
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English (en)
Inventor
N Hooper
T Gurnshaw
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TMM RES Ltd
TMM Research Ltd
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TMM Research Ltd
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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
    • 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

  • ABSTRACT Watkins Attorney-Watson, Cole, Grindle & Watson [57] ABSTRACT
  • the yarn is advanced over a heat transfer element by the passage of the yarn at one end or at each end of the element over guide means which causes a reversal of the direction of travel of the yarn over the element and a transfer of the yarn from a path in contact with one side of the element to a path in contact with the other side of the element and which is stationarily arranged or arranged in operation to revolve at a speed less than that of the contacting traveling yarn.
  • the yarn upon leaving the element is twisted by twisting means with the twist running back to the yarn passing over the element beyond the guide means or beyond at least the last contacted guide means.
  • apparatus for treating a synthetic yarn comprising a heat transfer element over which the yarn is passed, in contact therewith, twisting means to impart twist to said yarn upon leaving said element, and yarn guide means at one end or at each end of said element over which the yarn is caused to pass and which causes a reversal of the direction of travel of the yarn.
  • said yarn guide means or each of said yarn guide means being stationary or being arranged in operation to revolve at a speed less than that of the contacting travelling yarn, whereby twist imparted to the yarn runs back to the yarn passing over the element beyond the guide means or beyond at least the last contacted guide means.
  • a method of treating a synthetic yarn comprising the steps of advancing said yarn over a heat transfer element by the passage of the yarn at one end or at each end of said element over guide means which causes a reversal of the direction of the travel of the yarn over the element and a transfer of the yarn from a path in contact with one side of the element'to a path in contact with the other side of the element and which is stationarily arranged or arranged in operation to revolve at a speed less than that of the contacting travelling yarn, and using means to impart to said yarn upon leaving the element a twist which runs back to the yarn passing over the element beyond the guide means or beyond at least the last-contacted guide means.
  • FIG. 1 is a schematic front elevation of crimping apparatus according to a first embodiment of the invention
  • FIG. 2 is a side elevation of part of the apparatus shown in FIG. 1
  • FIG. 3 is a schematic side elevation of part of a yarn crimping apparatus according to a second embodiment of the invention
  • FIG. 4 is a schematic front elevation of crimping ap paratus according to a third embodiment of the invention, with parts thereof shown in section, and
  • FIG. 5 is a side elevation of the apparatus shown in FIG. 4.
  • a continuous filament yarn Y of synthetic material is forwrde'd by feed rollers 1 and 2 to a heater 3 over one side of which the yarn passes downwardly to a stationary guide pin 4, round which the yarn passes in a circumferential groove formed in the pin.
  • the yarn is passed in contact with the other side of the heater 3 upwardly to a stationary guide pin 5 round which the yarn passes in a circumferential groove formed in the pin.
  • the yarn then again passes in contact with the said one side of the heater 3 and on leaving the latter passes through a false-twisting device 6, from which it is taken-up by delivery rollers 7 and 8.
  • the device 6 may be a friction twister of the bush type, as shown, or any of the known rotating false twist tubes.
  • the twist inserted by the false-twisting device 6 runs back into the heating zone provided by the heater 3 and it has been found that contrary to what was previously believed the twist runs past the guide pins 4, 5 provided that the path of yarn contact with the guide pins 4, 5 is not too long and that the pins 4, 5 are held stationary or allowed to rotate at a speed less than the speed of the contacting yarn. If the guide pin 5 is caused to rotate at the speed of the yarn, the passage of twist over the pin is hindered.
  • the effective heating of the yarn by the heater 3 can be varied to suit the processing conditions required by varying the number of passes which the yarn makes over the heater 3.
  • the yarn Y is guided over the two sides of the heater 3 by guide pins 4 and 5 and twist is imparted to the yarn in the same manner by a false-twisting device 6.
  • the driven rollers 9 and 10 are however replaced by freely rotating pairs of rollers 11, 11' and 12, 12 which serve to prevent the yarn from fouling the edges of the heater.
  • a very narrow double sided heater may be used having grooved guides immediately adjacent each end of the heater to provide the required reversing of the yarn path and the separation of them over the heater.
  • a continuous undrawn filament yarn Y of 20 denier nylon 6 is fed by rollers (not shown) to a draw pin 13 around which the yarn is wrapped once, whereafter it is wrapped around a draw roller assembly 14' situated about three feet away from the pin 13, thus creating a draw zone between the draw pin 13 and the draw assembly 14.
  • the latter consists of a driven draw roller 15 and a separator 16 to produce the required number of wraps.
  • a rubber cott roller 17 is spring-loaded against the draw roller 15 to nip the final yarn wrap for a purpose which will hereinafter be described.
  • the draw ratio is 3.2 to l.
  • the drawn yarn Y passes at a speed of about 500 m.p.mt from the draw roller 15 to the heater 3, which is 600 mm. long, and over one side thereof downwardly to a guide pin 4 round which the yarn passes in a circumferential groove formed in the pin.
  • the pin 4 is driven at about rpm. from a pulley 18 engaged by a driving belt 181. From the guide pin 4 the yarn passes in contact with the other side of the heater 3 which is maintained at about 183 C and then upwardly to a guide pin 5 which is also driven by the belt 181 at about 5 r.p.m., and around which the yarn passes in a circumferential groove formed in the pin.
  • the pins 4 and 5 are driven at 5 rpm. in the direction of the contacting travelling yarn Y.
  • the yarn Y then again passes in contact with said one side of the heater 3 and on leaving the latter passes at an angle of about 85 through the entrance of a first twisting bush 19 situated 70 cm. from the heater.
  • the yarn passes through the first bush 19 diagonally and leaves it to enter a second bush 20 in series with the first bush.
  • the yarn Y takes a diagonal path through the second bush 20 and leaves it at an exit angle of about 65.
  • Each of the bushes I9 and 20 is mounted in highspeed bearings (not shown) and the bushes are driven by a common belt 21 in opposite directions, which mutually assists in imparting false twist to the yarn Y running through them due to the reversed yarn path.
  • the bushes 19 and 20 consist'of steel cylinders 191 and 201 with insert rings 192, 193 and 202, 203 of polyurethane.
  • the rings areof quadrant-section presenting an outwardly flared entrance and exit for the yarn.
  • the yarn Y is drawn to the optimum ratio entirely in the draw zone.
  • the yarn Y may be advanced over the heater 3 to the delivery rollers 7 and 8 with up to 7 percent underfeed or with up to 7 percent overfeed.
  • Crimping apparatus permits the use of a short heater and the apparatus may therefore be made very compact.
  • the period for which the yarn remains in contact with the heater is even at high speeds, long enough to heat the yarn sufficiently and the apparatus can therefore be used for treating heavy denier yarn where there is more yarn per unit length to heat up.
  • Yarns from 1S-200 denier can be texturized by the apparatus described in the third embodiment.
  • higher throughputs of yarn are acceptable particularly with the crimping apparatus hereinbefore described with reference to FIGS. 4 and 5, which utilizes a pair of false twist bushes in series for imparting twist to the yarn.
  • the second bush in this embodiment puts in less twist than the first bush and in practice the throughput rates are determined by the rate at which twist can be inserted.
  • a method of treating a synthetic yarn comprising the steps of advancing said yarn over a heat transfer element, reversing the direction of travel of the yarn over the element with guide means and transferring the yarn from a path in contact with one side of the element to a path in contact with the other side of the element, maintaining the linear speed of advancement of the yarn at a rate which is relatively-greater than the linear speed of the portions of the glide means which are in instantaneous contact with the travelling yarn, and then imparting-to said yarn, as it leaves the element, twist which runs back to the yarn passing over the element beyond at least the last contacted guide means.
  • a method as claimed in claim 7 wherein the partial drawing of the yarn is performed by underfeeding the yarn by up to 7 percent over the heat transfer element to driven delivery rollers situated beyond the twisting means.
  • a method as claimed in claim 1 further comprising the step of preventing twist from running forwardly of the twisting means by situating a peg beyond the twisting means and wrapping the yarn around the peg.
  • the yarn is a polyester yarn such as polyethylene terephthalate or a polyamide such as nylon.
  • Apparatus for treating a synthetic yarn comprising a heat transfer element over which the yarn is passed in contact therewith, twisting means arranged to impart twist to said yarn upon leaving said element and yarn guide means at at least one end of said element over which the yarn is caused to pass and which causes a reversal of the direction of travel of the yarn over the heat element and the transfer of the yarn from a path in contact with one side of the element to a path in contact with the other side of the element, means for advancing the yarn over said guide means at a linear speed of advancement which is relativelygreater than the linear speed of the portions of said yarn guide means which are in instantaneous contact with the travelling yarn, whereby twist imparted to the yarn runs drivable roller is situated between at least one guide means and an adjacent end of the element for assisting the movement of the yarn over the heat transfer element.
  • Apparatus as claimed in claim 14 wherein said twisting means comprises a rotary false twist bush for imparting false twist to the yarn passing therethrough.
  • said twisting means comprises a pair of rotary false twist bushes for successively imparting false twist to the yarn which passes first to one of the bushes and then to the other.
  • Apparatus as claimed in claim 18 wherein the yarn drawing means comprises a draw roller assembly around which the yarn forms a plurality of wraps and a nip roller which cooperates with the draw roller assembly to nip one of the yarn wraps and prevents twist in the yarn running back to the draw zone.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US00097969A 1969-12-16 1970-12-14 Treatment of synthetic yarns Expired - Lifetime US3724191A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB61237/69A GB1280168A (en) 1969-12-16 1969-12-16 Improvements in the treatment of synthetic yarns

Publications (1)

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US3724191A true US3724191A (en) 1973-04-03

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US00097969A Expired - Lifetime US3724191A (en) 1969-12-16 1970-12-14 Treatment of synthetic yarns

Country Status (6)

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US (1) US3724191A (ja)
CH (3) CH547878A (ja)
DE (1) DE2061795A1 (ja)
FR (1) FR2073849A5 (ja)
GB (1) GB1280168A (ja)
NL (1) NL7017897A (ja)

Cited By (7)

* 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
US3938307A (en) * 1973-04-02 1976-02-17 Platt International Limited Drawing and texturing by false twist crimping of synthetic textile filament
US3938314A (en) * 1974-05-10 1976-02-17 E. I. Du Pont De Nemours And Company False-twist texturing process with hollow friction twist tubes
US3971201A (en) * 1974-08-16 1976-07-27 Barmag Barmer Maschinenfabrik Aktiengesellschaft False-twist crimping machine
US3971200A (en) * 1974-03-06 1976-07-27 Leesona Corporation Process and apparatus for continuous heat setting of carpet yarns
US4030278A (en) * 1970-10-08 1977-06-21 Bayer Aktiengesellschaft Highly elastic crimp yarn
US5755086A (en) * 1994-11-25 1998-05-26 Maschinenfabrik Rieter Ag Arrangement of draw texturing machines for synthetic fibers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2184075A1 (en) * 1972-05-10 1973-12-21 Platt International Ltd Textured yarn having two multifilament strands - which are combined after false twisting and heated to modify the crimp
JPS5021567B2 (ja) * 1972-10-30 1975-07-24

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3449898A (en) * 1967-10-10 1969-06-17 Nippon Rayon Kk Heater for yarn twister
US3460215A (en) * 1967-02-20 1969-08-12 Rieter Ag Maschf Relaxation apparatus for a draw winder for synthetic threads
US3491524A (en) * 1967-02-17 1970-01-27 Nippon Rayon Kk Apparatus for false twisting filaments of thermoplastics fibers
US3535866A (en) * 1968-02-29 1970-10-27 Nippon Rayon Kk Process and apparatus for producing crimped yarns

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3491524A (en) * 1967-02-17 1970-01-27 Nippon Rayon Kk Apparatus for false twisting filaments of thermoplastics fibers
US3460215A (en) * 1967-02-20 1969-08-12 Rieter Ag Maschf Relaxation apparatus for a draw winder for synthetic threads
US3449898A (en) * 1967-10-10 1969-06-17 Nippon Rayon Kk Heater for yarn twister
US3535866A (en) * 1968-02-29 1970-10-27 Nippon Rayon Kk Process and apparatus for producing crimped yarns

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030278A (en) * 1970-10-08 1977-06-21 Bayer Aktiengesellschaft Highly elastic crimp yarn
US3910027A (en) * 1972-12-05 1975-10-07 Bayer Ag Process for the simultaneous stretch texturing of filament yarn
US3938307A (en) * 1973-04-02 1976-02-17 Platt International Limited Drawing and texturing by false twist crimping of synthetic textile filament
US3971200A (en) * 1974-03-06 1976-07-27 Leesona Corporation Process and apparatus for continuous heat setting of carpet yarns
US3938314A (en) * 1974-05-10 1976-02-17 E. I. Du Pont De Nemours And Company False-twist texturing process with hollow friction twist tubes
US3971201A (en) * 1974-08-16 1976-07-27 Barmag Barmer Maschinenfabrik Aktiengesellschaft False-twist crimping machine
US5755086A (en) * 1994-11-25 1998-05-26 Maschinenfabrik Rieter Ag Arrangement of draw texturing machines for synthetic fibers

Also Published As

Publication number Publication date
DE2061795A1 (de) 1971-06-24
CH547878A (ja) 1974-04-11
NL7017897A (ja) 1971-06-18
GB1280168A (en) 1972-07-05
FR2073849A5 (ja) 1971-10-01
CH539145A (de) 1973-08-31
CH1864970A4 (ja) 1973-11-15

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