US3200467A - Process of crimping and setting textile strands - Google Patents

Process of crimping and setting textile strands Download PDF

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Publication number
US3200467A
US3200467A US294990A US29499063A US3200467A US 3200467 A US3200467 A US 3200467A US 294990 A US294990 A US 294990A US 29499063 A US29499063 A US 29499063A US 3200467 A US3200467 A US 3200467A
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United States
Prior art keywords
setting
strands
crimping
chamber
strand
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Expired - Lifetime
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US294990A
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English (en)
Inventor
Iwnicki Kurt
David B Miller
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British Nylon Spinners Ltd
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British Nylon Spinners 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
    • D02G1/12—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes
    • D02G1/125—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes including means for monitoring or controlling yarn processing

Definitions

  • various measures may be taken to control the conditions of stutter-box crimping, so that, for instance, the crimp frequency may be maintained at a uniform value or the amount of crimped strand Within the stuffer-box may be maintained at a uniform value.
  • both the uniformity of crimp and the uniformity of setting are of great importance, as any variations of either along a yarn or tow are likely to lead to visually observable streaks and other undesirable markings when the yarns or tows are further processed into knitting yarns, fabrics, or articles of clothing.
  • a process for crimping textile strands in a stutter-box crimper in which process the strands are crimped and the crimp is set whilst the crimped strands are under pressure, is characterised in that the back pressure exerted on a strand at the successive instants of crimping is maintained constant by a continuous and automatic control of such pressure effective at a location intermediate of the point of crimping and the point of initiation of pressure on the strand within the stutter-box, and in that the crimp is set whilst the strand is under pressure within the stulfer-box.
  • the rate or amount of withdrawal of the strand from the stutter-box is correlated with the rate or amount of feed, so that the amount of strand material within the stutter-box is maintained constant and hence the time during which the strand is undergoing the setting treatment is likewise kept constant.
  • Such correlation may be achieved by a control of the rate or amount of feed, or by a control of the rate or amount of withdrawal, of the strand.
  • Setting may be effected by heat alone or by heat in combination with moisture.
  • the duration of the setting treatment can be extended, compared with that normally employed, because of the divorcing of the pressure-controlling function from that of pressure initiation, which allows for the use of a long setting zone in the stutferbox in which zone the strand material is under pressure the whole time.
  • the fact of having a long column of strand material under pressure is not deleterious to good crimping so long as the pressure at the actual point of crimping is kept under constant control at a location near to that point, i.c. nearer to it than the point at which the pressure was initiated, which latter point will normally be at the point of discharge of the strand from the stuffenbox.
  • the conditions do not have to be so severe as are sometimes required with existing staffer-box crimping processes.
  • Less severe conditions say a setting temperature of C. for heavy denier yarns of polyhexamethylene adipamide, when imposed over the allowable extended period of setting, will lead to thoroughly set crimp in the yarns.
  • Shorter, more intensive, setting treatments are Wes) prone to be incompletely enective on the strand material in the middle of the stutter-box, as the outer portions of strand material act as heat insulators for the middle portion; or else the outer portions may even be damaged owing to excessive heat from the surfaces of the staffer-box in contact with them.
  • FIGURE 1 is a front elevational view of said crimper, shown partly in section where cut away; and FIGURE 2 is a side view, partly in section, of the apparatus of FIGURE 1.
  • the compression chamber is divided into a relatively short crimping zone and a relatively long setting Zone, and the end-portion of the chamber, comprising the setting Zone, is mounted for limited movement in its lengthwise direction relative to the other end-portion comprising the crimping zone.
  • the apparatus comprises nip rolls 1, 2 each of which is driven in the directions shown by the arrows in FIGURE 1.
  • the drive is transmitted from endless bands 3, 4 (FIGURE 2) through pulley-wheels 5, 6 and gearbox 7.
  • yarns Y converge at guide 9 before being led around a portion of the periphery of feed roll 11 pivotally mounted on arm 13 and held in contact with the periphery of nip roll 2 by means of weight 15 on the end of arm 13.
  • Nip rolls 1, 2 form the entry to the crimping zone endportion which is further bounded by front wall 17, back wall 19 and side walls 21, 22.
  • Side walls 21, 22 have extensions 23, 24 at their lower ends which fit into the mouth of the setting zone end-portion, to be described below.
  • the setting zone end-portion consists of a rectangular cross section setting chamber 25 the main length of which is enclosed within a heater jacket 27.
  • the end-portion is mounted on flexible steel spring cantilever arms 28, 29; and it is loaded, to be urged upwardly towards contact with the crimping zone end-portion, by means of weights 31 hung on the end of strand 33 passed around pulley wheel 35.
  • the discharge end of the chamber 25 is restricted by means of hinged flap 37 adjustably fixed in a desired position by means of screw 39.
  • the front and back walls of the chamber are heated by electrical resistance heaters 41, 42, and the spaces 43, 44 within the jacket 27 may be filled with heat-insulating material.
  • the crimped yarn Y is positively withdrawn from the setting chamber 25 around pin 45 by wind-up means (not shown).
  • the point of discharge from the setting zone is restricted so as to initiate the back pressure on the strand material within the compression chamber as a whole; and the actual pressure on the material within the crimping zone end-portion is controlled at a uniform value by reason of the load applied to the movable setting zone end-portion and tending to force said end-portion in the direction contrary to the direction of travel of the crimped strand through the crimper, which load is effective on the crimped strand material at the dividing line between the two end-portions.
  • the limited movement of the setting zone end-portion can be utilised to activate means for varying the rate or amount of feed or the rate or amount of withdrawal of the strand to or from the crimper, so that the amount of strand within the crimper is maintained constant.
  • Crimping pressure will be constant over limited movement of the setting zone end-portion since it is substantially independent, within the limits afforded by such movement, of the amount of yarn in the stutter-box.
  • the control of pressure at the point of crimping i.e. at the point where the strand is first discharged from the nip of the nip rolls, is effected at a location only a short distance from said point, being only separated therefrom by the length of the 4 crimping zone end-portion, which may be as little as an inch or two.
  • One way in which the amount of strand within the crimper can be maintained constant is by an electromechanical system, activated by movement of the setting zone end-portion, effective on the crimped strand after its withdrawal from the crimper to vary its tension.
  • an electromechanical system activated by movement of the setting zone end-portion, effective on the crimped strand after its withdrawal from the crimper to vary its tension.
  • the initiation of back pressure by the restriction discharge end of the setting zone end-portion can very simply be effected by extending the front wall inwardly towards the back wall near to the point of discharge, instead of by the hinged flap.
  • the amount of restriction need be enforced in the width of the discharge end in the plane perpendicular to the plane of the nip rolls, to bring about the exertion of pressure backwardly along the mass of crimped strand material right to the point of crimping.
  • the amount of restriction need not, in fact, amount to any restriction at all in crosssectional area of the discharge end of the setting zone compared with that of its input end, supposing that there is some divergence of the side walls of the setting zone end-portion.
  • the process of the invention has been proved to lead to uniformly crimped and uniformly crimp-set yarns of multifilamcnt polyhexamethylene adipamide.
  • three such yarns of 1040 denier/ 68 filaments each have been crimped together in a stutter-box whose crimping zone was some 4 inches in length and fixedly mounted immediately above a movably mounted setting zone some 12 inches in length, the front and back walls of the setting zone end-portion being heated by electrical resistance heaters thereon to 180 C. when the yarns were forwarded to the crimper at a little under 1000 feet/minute and wound-up at 900 feet/minute.
  • the movable setting zone end-portion was loaded with a weight of 9 lbs.
  • the tensioning device assumed the higher of its two settings, so as to remove less yarn from the crimper in unit time and allow the pressure to build up in the setting zone end-portion.
  • the tension settings were determined empirically and they were such, being grams and 300 grams for the yarns concerned, to allow for a variation in thickness of the crimped yarn bundle of some 5%, which provides a close enough control of the amount of yarn within the crimper.
  • steps comprising: forcing the strands from between nip rolls into a confined fixed compression chamber to subject them to back pressure for imparting crimp to them substantially at the point where the strands are discharged from the rolls; setting the crimp thus imparted to the strands by mainmo es?
  • steps comprising: forcing the strands from between nip rolls into a confined fixed compression chamber to subject them to back pressure for imparting crimp to them substantially at the point where the strands are discharged from the rolls; setting the crimp thus imparted to the strands by maintaining the crimped strands under pressure and passing them from the compression chamber to a setting chamber Where heat is supplied to the strands; initiating said back pressure by yieldingly resisting emergence of the strands from the setting chamber; and continuously and automatically controlling the pressure which is effective at a location intermediate the point of crimping and the point of initiating the back pressure in a manner to maintain the back pressure constant in the compression chamber and to hold the strands in the setting chamber under pressure during a longer period than that for which the strands are held in the compression chamber thereby maintaining uniformity of crimping and

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Load-Bearing And Curtain Walls (AREA)
US294990A 1962-07-19 1963-07-15 Process of crimping and setting textile strands Expired - Lifetime US3200467A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB27713/62A GB964909A (en) 1962-07-19 1962-07-19 Improvements in or relating to the crimping and setting of textile strands

Publications (1)

Publication Number Publication Date
US3200467A true US3200467A (en) 1965-08-17

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Application Number Title Priority Date Filing Date
US294990A Expired - Lifetime US3200467A (en) 1962-07-19 1963-07-15 Process of crimping and setting textile strands

Country Status (8)

Country Link
US (1) US3200467A (sv)
AT (1) AT261103B (sv)
BE (1) BE635206A (sv)
CH (1) CH442602A (sv)
ES (1) ES290118A1 (sv)
GB (1) GB964909A (sv)
NO (1) NO115305B (sv)
SE (1) SE326519B (sv)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408377A (en) * 1977-07-25 1983-10-11 Barmag Barmer Maschinenfabrik Ag Stuffing chamber texturizing process
US4462143A (en) * 1982-03-12 1984-07-31 Allied Corporation Method for controlling texture level in a moving cavity texturing process
US5943748A (en) * 1997-09-15 1999-08-31 American Suessen Corporation Adapter device for fiber processing unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2865080A (en) * 1953-10-28 1958-12-23 Du Pont Method and apparatus for crimping and relaxing filaments
US3009310A (en) * 1958-02-03 1961-11-21 Us Rubber Co Article and method of producing the same
US3023481A (en) * 1958-11-25 1962-03-06 Scragg & Sons Yarn crimping apparatus
US3046633A (en) * 1959-03-16 1962-07-31 Chori Co Ltd Apparatus for producing crimped thermoplastic synthetic yarns
US3058167A (en) * 1956-12-24 1962-10-16 Bancroft & Sons Co J Crimping apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2865080A (en) * 1953-10-28 1958-12-23 Du Pont Method and apparatus for crimping and relaxing filaments
US3058167A (en) * 1956-12-24 1962-10-16 Bancroft & Sons Co J Crimping apparatus
US3009310A (en) * 1958-02-03 1961-11-21 Us Rubber Co Article and method of producing the same
US3023481A (en) * 1958-11-25 1962-03-06 Scragg & Sons Yarn crimping apparatus
US3046633A (en) * 1959-03-16 1962-07-31 Chori Co Ltd Apparatus for producing crimped thermoplastic synthetic yarns

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408377A (en) * 1977-07-25 1983-10-11 Barmag Barmer Maschinenfabrik Ag Stuffing chamber texturizing process
US4462143A (en) * 1982-03-12 1984-07-31 Allied Corporation Method for controlling texture level in a moving cavity texturing process
US5943748A (en) * 1997-09-15 1999-08-31 American Suessen Corporation Adapter device for fiber processing unit

Also Published As

Publication number Publication date
ES290118A1 (es) 1963-12-16
CH442602A (de) 1967-05-13
DE1435352A1 (de) 1969-05-08
NO115305B (sv) 1968-09-16
BE635206A (sv)
GB964909A (en) 1964-07-29
SE326519B (sv) 1970-07-27
AT261103B (de) 1968-04-10

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