US3685273A - Method and apparatus for false twisting textile yarns and product obtained thereby - Google Patents

Method and apparatus for false twisting textile yarns and product obtained thereby Download PDF

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Publication number
US3685273A
US3685273A US23418A US3685273DA US3685273A US 3685273 A US3685273 A US 3685273A US 23418 A US23418 A US 23418A US 3685273D A US3685273D A US 3685273DA US 3685273 A US3685273 A US 3685273A
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United States
Prior art keywords
thread
annular
rotating
frictional surface
guide arms
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Expired - Lifetime
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US23418A
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English (en)
Inventor
Jacques Neveux
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Moulinage et Retorderie de Chavanoz SA
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Moulinage et Retorderie de Chavanoz SA
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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
    • D02G1/04—Devices for imparting false twist
    • D02G1/08—Rollers or other friction causing elements

Definitions

  • the new thread according to the invention is particularly useful for the manufacture of millinery articles, but, of course, its application is not limited to a single kind of use.
  • this double false twisting can also be combined with a third texturing operation, for example by inversion of twisting.
  • twisting processes of false twisting in continuous lead to a thread with residual torsion couple, generally called twisting," or thread with torque effect, which expressions shall be used below.
  • These threads can be used by alternating, during knitting, the rows of threads of twisting couple of opposite directions, which in certain cases has the advantage of imparting to the articles thus obtained a very great elasticity, while the threads themselves are relatively not very elastic.
  • false twisting in the same direction is meant that the two operations of twisting and of untwisting of each of the false twistings are respectively in the same direction.
  • the two false twistings have cumulative effects, whereas in the case where the false twistings are in opposite directions, they have effects with the tendency to undo each other, particularly in the case of an even number of false twistings of opposite directions, the torque effects created by each false twisting operation cancelling each other.
  • thermoplastic textile thread is textured by means of an annular friction surface in rotation about a fixed axis, this process being characterized in that the thread is put consecutively in contact with at least two points of the friction surface.
  • the thread is subjected to at least two operations of false twisting in opposite directions or in same direction.
  • the points of contact of the thread with the friction surface can be situated at any point of said surface, but
  • the length of thread included between the points of twisting by friction depends on the operating condi tions, such as the speed of supply of the thread, nature of the thread, temperature of the thermic treatment ahead of the twisting spindle. This length depends also on the effect desired, produced by a slight cooling of the thread occuring during its passage through two points offalse twisting.
  • this distance can be variable, so as to modify the effect produced on the thread, or the thread can be cooled, for example by an intermittent jet of cold air between the two operations of false twisting.
  • the thread traverses 2n times the annular space limited by the friction surface in rotation, n being a whole number which can be equal to zero.
  • a new multifilament textured thread is obtained which is also part of the invention, having a threedimensional texture and a strong power of elastic return, characterized in that this multifilament has an open structure, i.e., the component filaments are separate, the cohesion of the multifilament being due solely to the hooking of the different filaments and not to a common twisting.
  • this thread can be without torque effect, i.e., it has a stable configuration in the free state, without tendency to snarl, or on the contrary it can have a torque" effect and therefore a tendency to twist when in the free state.
  • the process of the invention can apply to any multifilament thread generally used in classical texturing, such as thread with a small number of filaments, as is the case for threads intended for the manufacture of hosiery, or threads with a fairly large number of filaments such as those intended for normal applications of millinery or weaving.
  • the process according to the invention can be executed by means of a device of falsetwisting by friction.
  • this device of false twisting by friction comprises at least one annular surface of friction in rotation over itself about a fixed axis, whose faces for the entrance and outlet of the thread in the annular space defined by this surface are blended together, this annular surface being in contact at at least two points with a thread moving under tension, and is characterized in that this friction surface is associated with means to guide the thread in the annular space.
  • This false twisting spindle can be formed by a revolving tube driven in rotation, this tube having a hollowed terminal part covered on the inside by a ring made of a material with a high coefficient of friction, and the guiding means can be formed by a device including guiding arms staggered with respect to one another by a certain angle, these guiding arms sliding in a fixed tube and each having an eyelet for the passage of the thread.
  • entrance face of the thread in the annular space is meant the face which the thread traverses when it penetrates for the first time in this annular space.
  • outlet face is the face which the thread traverses when it comes out for the last time from this annular space.
  • annular surface of friction is circular.
  • the false twisting spindle is formed by a revolving tube, driven in rotation for example by a belt.
  • This tube has a hollowed terminal part, covered on the inside by a ring made of a material with high coefficient of friction but not abrasive, such as reinforced elastomer or a ceramic based on aluminum or titanium oxide.
  • the means for guiding the thread in the annular space are formed by several guiding arms staggered with respect to one another by a certain angle, and having at one end an eyelet for the passage of the thread.
  • the guiding arms can slide inside a fixed hollow tube so that, in the rest position, they are situated outside the hollow space of the spindle so as to facilitate the threading of the thread.
  • the guiding arms are held in position with respect to one another by means of an elastic element, or a stop, or a ramp, or any equivalent means.
  • these guiding anns can be mounted on a simple or multiple element sliding inside the central shaft of the spindle, particularly inside the annular space.
  • These arms can be mounted dissymmetrically and can be of different lengths, so as to provide for example different arcs of contact during the two operations of false twisting.
  • these arms having an adjustable position.
  • the spooling device is of any known type, but must allow high receiving speeds going up to L000 m/min. corresponding to speeds of production of the thread according to the invention.
  • FIG. 1 represents a general false twisting device.
  • FIGS. 2 and 3 give a detailed view of a spindle of false twisting by friction and of means to guide the thread through said spindle in the case of two false twistings in opposite directions.
  • FIG. 4 is a detailed view of a spindle identical to that illustrated in FIGS. 2 and 3, but associated with guiding means guiding the thread through said spindle in the case of two false twistings in the same direction.
  • FIG. 5 illustrates an example of execution according to which the thread traverses a friction ring driven peripherally.
  • a thread 1 drawn from a spool 2 passes over guides 3 and 4, then through a belt feeder 5 before being directed by a guide 6 into a heating chamber 7 where it is heated thermically.
  • the thread is textured in the device 8 according to the invention before traversing a guiding eyelet 9 and a second belt feeder 10, then being directed by guides 11 and 12 over a spooling device comprising a thread guide 13 moving to-and-fro, a winding spool 14 as well as a pressure roll 15.
  • the texturing device 8 (See FIGS. 2 and 3) is formed by a friction ring 16 mounted in a spindle l7, driven in rotation by means of a device which is not represented.
  • the guiding means are formed by two arms 18 and 19 with eyelets 20 and 21 for the passage of the thread. These two arms can slide inside the hollow tube 22.
  • Suitable jet means may be suitably positioned adjacent the yarn path to provide an intermittent jet of cold air to the thread to cool the same between the two operations of false twisting, as aforementioned.
  • the thread is guided so as to have an S trajectory inside the spindle 17.
  • the thread 1 at its outlet from the heating chamber, downstream of the guide 23 passes successively over the friction ring 16 then in an eyelet 25 in the angled arm 26, and in an eyelet 27 in arm 28, the eyelet 27 being situated ahead of the spindle with respect to the friction ring.
  • the thread is subjected on ring 16 to a second false twisting in the same direction, before being guided out of the annular space by an eyelet 29 and a return guide 30 carried by a third sliding arm 31.
  • Such an arrangement allows to keep the same spindle, therefore the same general device, with the same production speeds as in the previous case.
  • a spindle with peripheral drive such as illustrated in FIG. 5, where at the outlet of eyelet 27 the thread is subjected to a second false twisting, then is recalled directly by coming out through the opposite face of the annular surface.
  • the spindle is formed by a friction ring 32 arranged in a tube 33, mounted rotating on a roller 34 and driven by its periphery, for example by a belt passing in a throat 35
  • a friction ring 32 arranged in a tube 33, mounted rotating on a roller 34 and driven by its periphery, for example by a belt passing in a throat 35
  • EXAMPLE 1 Using a spindle according to FIGS. 2 and 3, comprising a friction ring of inside diameter equal to 28 mm, made of reinforced elastomer material, one treats a thread of polyhexamethylene adipamide (nylon 66) 22 dtex/3 filaments of initial twisting 12 turns per meter (twisting Z) according to the following operating conditions:
  • a skein of thread is made which is immersed in the relaxed state for 10 minutes in water kept at 65 C.
  • This skein is then rinsed, drained for 1 minute and dried in an oven for l0 minutes at 65 C.
  • the skein is then suspended for 5 minutes in a laboratory where the temperature is to 22 C and the humidity is 65 to 70 percent.
  • the skein is subjected for 2 minutes to a load of 0.225 g/dtex, a length L is thus measured, then the previous load is replaced with a second load of 0.0018 g/dtex, and a second length L is measured.
  • a skein is made of three turns on a float of 3 meter perimeter, then a weight of 4.8 kg is suspended to this skein. Then the skein is suspended, it is allowed to become stabilized, and it is unwound counting the number of turns.
  • EXAMPLE 2 This example is identical to the first one as to the operating conditions, except for the temperature of the oven which is 180 C, but here one uses a thread of polycaprolactam (nylon 6) 22 dtex/3 filaments.
  • the resistance of the thread obtained is of 4.5 g/dtex and its elasticity is 1 l0 percent, and its torque effect is equal to zero.
  • EXAMPLE 3 This example is identical to Example 2 except that the friction ring is of ceramic.
  • the resistance of the thread is 3.6 g/dtex and its elasticity is 108 percent, and
  • EXAMPLE 4 The same texturing device equipped with a spindle according to Example 1 is used, but a polyethylene terephthalate thread 22 dtex/4 filaments is treated according to the following operating method:
  • EXAMPLE 5 The operating conditions remain identical to those of the previous example except that the thread is guided according to the device of FIG. 4, the thread being subjected to two false twistings in the same direction.
  • the thread obtained has a break resistance of 4.5 g/dtex, and elasticity of 176 percent and a torque effect of turns measured under the conditions defined above.
  • thermoplastic threads comprising the steps of rotating an annular frictional surface about its central axis, heating a length of thermoplastic thread, passing a running length of the heated thread into contact with the rotating annular surface to twist the thread about its longitudinal axis, passing the thread 'out of contact with the annular surface, intermittently cooling the thread while out of contact with the annular frictional surface, and again passing the thread into contact with the rotating annular surface to twist the thread about its longitudinal axis, thereby subjecting the thread to at least two consecutive operationsof false twist.
  • Apparatus for frictionally false twisting a running length of thread comprising means defining an annular frictional surface, means for rotating the annular surface about its central axis, and means for guiding the thread into engagement with the annular frictional surface at at least two spaced points to impart consecutive twist to the thread about its longitudinal axis, said guiding means comprising plural guide arms supported on one side of said annular frictional surface in angular staggered relation with respect to each other and means for moving said guide arms toward and away from said annular frictional surface to direct thread into and out of engagement therewith.
  • Apparatus as defined in claim 2 wherein said means for moving said guide arms comprises a hollow tube, and end portions of said guide arms being slidable along said hollow tube to telescopically extend and retract the guide arms for movement into and out of the space bounded by said annular frictional surface.
  • said guide means include at least three guide arms, eyelets on each of said guide arms for engaging and guiding thread, and said moving means including means for positioning some of the eyelets of said guide arms on one side of the space bounded by said annular frictional surface and some of the eyelets on the other side of said space to define paths of multiple passage of the thread through the bounded space.
  • a process for texturing threads comprising the steps of rotating an annular frictional surface about its central axis, heating a length of thermoplastic thread, passing a running length of the heated thread into the space bounded by the annular surface and reversing the direction of travel of the thread through the space to contact the thread with the rotating surface at least twice to twist the thread about its longitudinal axis.
  • Apparatus for false twisting a running length of thread comprising means defining an annular frictional surface, means for rotating the surface about its central axis, and means for guiding the thread through the space bounded by the annular surface in reversing directions to contact the thread with the frictional surface at at least two spaced points to impart twist thereto.
  • said means defining said annular surface comprises a cupshaped member, the internal side portions of said member being comprised of a member having a high coefficient of friction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US23418A 1969-03-28 1970-03-27 Method and apparatus for false twisting textile yarns and product obtained thereby Expired - Lifetime US3685273A (en)

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FR6909520A FR2034422A1 (ja) 1969-03-28 1969-03-28

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US (1) US3685273A (ja)
AR (1) AR194186A1 (ja)
BE (1) BE747929A (ja)
BR (1) BR7017757D0 (ja)
CA (1) CA947586A (ja)
DE (1) DE2014516A1 (ja)
ES (1) ES377948A1 (ja)
FR (1) FR2034422A1 (ja)
GB (1) GB1279342A (ja)
SE (1) SE352111B (ja)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802175A (en) * 1971-03-08 1974-04-09 Ici Ltd Apparatus and process for producing twist in textile yarns
US3863434A (en) * 1971-07-21 1975-02-04 Werner Doschko False twisting of yarn
US3939632A (en) * 1973-05-14 1976-02-24 Imperial Chemical Industries Limited Process for the production of effect yarns
US3969883A (en) * 1973-10-19 1976-07-20 Chavanoz S.A. Spindle for false twist by friction
JPS5188759A (ja) * 1975-01-27 1976-08-03 Kenshukuseikakoshinoseizohoho
US3994123A (en) * 1973-10-10 1976-11-30 Turbo Machine Company Friction twisting head
US4015414A (en) * 1974-06-12 1977-04-05 The Warner & Swasey Textile Machine Company Monitored twist control apparatus and method
US4297837A (en) * 1978-12-18 1981-11-03 Barmag Barmer Maschinenfabrik Aktiengesellschaft Method and apparatus for producing spun yarn characteristics in synthetic multifilament yarns

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2171635A5 (ja) * 1972-02-08 1973-09-21 Chavanoz Sa
GB1416706A (en) * 1972-07-25 1975-12-03 Scragg & Sons Yarn texturing process
CH549662A (de) * 1972-09-18 1974-05-31 Heberlein & Co Ag Friktions-falschdrallvorrichtung.

Citations (8)

* 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
US3009312A (en) * 1956-07-30 1961-11-21 Textile Licensing Company Methods of producing torque yarns
US3029591A (en) * 1956-08-23 1962-04-17 Sydney & E Scragg Ltd Twisting of textile yarns
US3066473A (en) * 1960-03-23 1962-12-04 Maeda Yutaka Apparatus and method for imparting twist and crimp to textile yarns
US3114231A (en) * 1960-02-26 1963-12-17 Novivlas Nv Method and apparatus for the manufacture of bast fibre yarn
FR1455202A (fr) * 1965-07-06 1966-04-01 Klinger Mfg Co Ltd Procédé et appareil pour entraîner des broches de fausse torsion
US3527043A (en) * 1968-01-05 1970-09-08 Chavanoz Moulinage Retorderie Means and process for producing a false twist by friction
US3535866A (en) * 1968-02-29 1970-10-27 Nippon Rayon Kk Process and apparatus for producing crimped yarns

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3009312A (en) * 1956-07-30 1961-11-21 Textile Licensing Company Methods of producing torque yarns
US3029591A (en) * 1956-08-23 1962-04-17 Sydney & E Scragg Ltd Twisting of textile yarns
US2936570A (en) * 1956-11-16 1960-05-17 British Nylon Spinners Ltd Twisting of textile filaments
US3114231A (en) * 1960-02-26 1963-12-17 Novivlas Nv Method and apparatus for the manufacture of bast fibre yarn
US3066473A (en) * 1960-03-23 1962-12-04 Maeda Yutaka Apparatus and method for imparting twist and crimp to textile yarns
FR1455202A (fr) * 1965-07-06 1966-04-01 Klinger Mfg Co Ltd Procédé et appareil pour entraîner des broches de fausse torsion
US3527043A (en) * 1968-01-05 1970-09-08 Chavanoz Moulinage Retorderie Means and process for producing a false twist by friction
US3535866A (en) * 1968-02-29 1970-10-27 Nippon Rayon Kk Process and apparatus for producing crimped yarns

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802175A (en) * 1971-03-08 1974-04-09 Ici Ltd Apparatus and process for producing twist in textile yarns
US3863434A (en) * 1971-07-21 1975-02-04 Werner Doschko False twisting of yarn
US3939632A (en) * 1973-05-14 1976-02-24 Imperial Chemical Industries Limited Process for the production of effect yarns
US3994123A (en) * 1973-10-10 1976-11-30 Turbo Machine Company Friction twisting head
US3969883A (en) * 1973-10-19 1976-07-20 Chavanoz S.A. Spindle for false twist by friction
US4015414A (en) * 1974-06-12 1977-04-05 The Warner & Swasey Textile Machine Company Monitored twist control apparatus and method
JPS5188759A (ja) * 1975-01-27 1976-08-03 Kenshukuseikakoshinoseizohoho
JPS5310185B2 (ja) * 1975-01-27 1978-04-12
US4297837A (en) * 1978-12-18 1981-11-03 Barmag Barmer Maschinenfabrik Aktiengesellschaft Method and apparatus for producing spun yarn characteristics in synthetic multifilament yarns

Also Published As

Publication number Publication date
DE2014516A1 (de) 1970-10-08
SE352111B (ja) 1972-12-18
CA947586A (en) 1974-05-21
GB1279342A (en) 1972-06-28
FR2034422A1 (ja) 1970-12-11
ES377948A1 (es) 1972-06-16
AR194186A1 (es) 1973-06-29
BE747929A (fr) 1970-08-31
BR7017757D0 (pt) 1973-01-11

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