US3680302A - False twisting apparatus - Google Patents

False twisting apparatus Download PDF

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Publication number
US3680302A
US3680302A US83894A US3680302DA US3680302A US 3680302 A US3680302 A US 3680302A US 83894 A US83894 A US 83894A US 3680302D A US3680302D A US 3680302DA US 3680302 A US3680302 A US 3680302A
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Prior art keywords
thread
false
twist
roller
freely rotatable
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Expired - Lifetime
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US83894A
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English (en)
Inventor
Rudolf Hess
Heinz Engel
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Akzona Inc
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Akzona Inc
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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

Definitions

  • ABSTRACT In combination with means to transport a continuous monoor multi-filament thread in a linear thread path at a controlled rate of withdrawal, a frictional false twist device consisting of a single freely rotatable roller positioned obliquely to the linear thread path to receive a spiral loop of thread therearound, the freely rotatable roller having a concave arcuate thread contacting surface which is a surface of revolution.
  • falsetwisting means is carried back against the direction of thread travel through the heating means up to a twist-stopper.
  • the largely plasticized or softened filament or multifilament thread passing the heater has the opportunity to twist and, as it passes through the cooling zone between the heater and the false-twister, the twist is fixed in it. Twisting back to the zero point, i.e., zero-twist, is achieved by the rotation of the filament or' thread as it passes the twisting unit, usually by means of a so-called twist-trapper. Accordingly, the filament thus treated and then collected or wound on a take-up spool does not have a genuine twist, but merely a tendency to rotate when it is off-,
  • One, object of the present invention is to provide a frictional false-twist device which does not exhibit any of the disadvantages of conventional false-twisters, i.e., uncontrollable slip, the need to provide several identical rollers and/or the need for yarn guides.
  • a further object of the invention is to provide a false-twist device which makes it possible to work at much higher takeoff rates than was possible with conventional twisters of the frictional type referred to above, especially in drawtwist apparatus employing a false-twister. Take-off rates of more than 800 m/min. are now possible, being accompanied by stretching, whereas previous take-off rates were limited to about 400 m/min.
  • Another object of the invention is to provide a false-twist device which has a sufficiently high static friction even though looping is not much in excess of 360, i.e., using approximately one turn or spiral loop around the false-twister.
  • a false-twist apparatus for the treatment of a continuous monofilament or multifilament thread, especially for texturizing the thread with a heatset durable torque crimp, by employing apparatus which comprises means to transport the thread in a substantially linear path including means for withdrawing the thread from a feed source at a constant rate, and a frictional false-twist device consisting of a single freely rotatable roller arranged with its axis of rotation obliquely to the linear thread path in order to receive a thread contact surface is preferably an arcuate surface mounting the roller on ball bearings, roller bearings or the like such that it can be easily turned by a filament or thread looped around the roller under tension and taken off at a constant speed, i.e., at a constant winding or withdrawal speed.
  • the roller must be rotated by the thread without having to be positively driven by an auxiliary motor or other positive drive means.
  • the false-twist device-employed in the apparatus of the invention consists of only a single roller because by virtue of the geometry of this roller, there is no need for one or more auxiliary rollers, thread guides or other means for improving the false-twisting action and guiding of the thread.
  • thread contact surface is employed herein to designate that part of the roller circumferential surface which comes into contact with the transported monofilament or continuous multifilament thread through looping approximately once'around the roller. According to the invention,it is this yarn contact surface which is concave with a smooth curved or arcuate shapeand represents a surface of revolution, i.e., a
  • the yarn contact surface of the roller is a surface of revolution generated by rotation of an are symmetrical with respect to the centerline perpendicular of the axis of rotation of the roller, about the axis of rotation, is particularly easy to manufacture and at the same time particularly suitable for uniformly texturizing monofilaments and continuous multifilament threads or yarns-
  • this contact surface is of advantage for this contact surface to be roughened to a depth (R,) of from about 2 to 8 microns (cf. German Industrial Standards, DIN 4762, Sheet 1).
  • the yarn contact surface is preferably given a hard dull chrome finish for the same reasons.
  • FIG. 1 is a largely schematic view of draw-twist apparatus illustrating the path followed by the thread as it islooped around a twister according to the invention
  • FIG. 2 is a longitudinal section through a false-twist roller according to the invention together with its mounting for free rotation on a fixed spindle.
  • FIGS. 3 and 4 are plan views of two difierently mounted false-twist devices according to the invention in which the thread contact angle, i.e., the oblique angle between the thread and the false-twist roller is made variable by adjustably arranging and fixing the spindle in different positions.
  • the thread contact angle i.e., the oblique angle between the thread and the false-twist roller is made variable by adjustably arranging and fixing the spindle in different positions.
  • the roller 1 acting as the false-twist device is arranged between a heated fixing pin '14 and a stretching godet with its adjacent guide roller 15a of an otherwise conventional draw-twisting machine. Betweenthe fixing pin 14 and the roller 1, there must be a sufficiently longcooling zone to ensure a heatsetting or fixing time suitable for the withdrawal rate of the false-twistedfilament or thread 16.
  • the path followed by the filament or thread extends from the delivery spool or bobbin 12, over the guide pin 13, partly around the fixing pin 14, once around the roller 1 and then with several loops around the stretching godet assembly 15 and 15a, as shown by a continuous a heating plate, an elongated heating tube providing a contact and/or radiant heater or the like.
  • the supply package or bobbin 12 can be of any conventional form and one can employ a set of feed rolls to more carefully control the rate of feed as well as inserting various types of tensioning means as the thread is brought into a linear path leading to the false-twist roller.
  • other withdrawal means may be employed although the godet and guide roller assembly has been found to be especially advantageous.
  • the single freely rotatable roller does not require supplemental guides, rollers, motor-driven spindles, twisttrappers or similar elements in order to function properly as a false-twist device.
  • This means that the thread can be transported directly from the heating means or other feed point at which the backed up twist is stopped up to the false-twist roller, and likewise that the thread can than be conducted directly to the withdrawal means,
  • the term directly is used here in I the sense that the thread is conducted in a substantially broken line.
  • the heated fixing pin 14 it is linear free path without any contact with other threading elements such as guides, rollers or the like.
  • FIG. 2 provides details of one preferred embodiment of the frictional false-twist roller according to the invention.
  • the roller V1 with its arcuate concave thread contact surface is mounted on roller bearings 7 so as to be freely rotatable on a spindle 2.
  • a bushing 3 and rings 6 and 8 prevent the roller from being axially displaced.
  • Discs 4 and 5 are designed to prevent dirt from getting into the bearings.
  • the roller 1 shown in FIG. 2 has a concave yarn contact surface 9 which is in the form of a surface of revolution generated by the rotation of an are about the axis of rotation ll,"this are which is also identified by 9 being symmetrical with respect to a perpendicular line 10 passing through the center of the axis of rotation 11 of the roller 1.
  • FIG. 3 illustratesa false-twist roller with a variable or adjustable contact angle.
  • a thread 16 passes the roller 1 and at the same time'is looped about once around it and then, while being false-twisted, continues traveling to the stretching godet and guide roller assembly.
  • the remaining apparatus has been omitted since it either corresponds to FIG. 1 or may include other conventional apparatus such as a take-up spool or the like.
  • the roller 1 is mounted for free rotationby means of roller hearings on a fixed spindle attached to an L-shaped support 17.
  • the leg 17a of this support 17 is spaced backwardly from the roller 1 and is pivotally mounted for rotation to a supporting plate or frame 19 at the center of rotation 18 by means of a suitable locking screw.
  • a suitable locking screw At the free end of the roller support 17,- there are reference marks 21 which indicates the thread delivery, the angle of contact can be easily measured with a conventional protractor or other tool.
  • the device according to the invention is particularly suitable for texturizing monofilaments and continuous threads having only two or three individual filaments.
  • Polyamide threads i.e., nylon threads, having a denier or size of dtex l4f2, dtex 22f l, dtex 22f2 and dtex 22 f 3, have been successfully false-twisted and tests with deniers of dtex 50 have also been successfully conducted as have tests with other fibrous polymers, for
  • polyesters such as polyethylene terephthalate. (The total yarn size is measured as dtex" preceding I -the value given while f precedes the number of individual filaments in the thread.)
  • the false-twist roller of the invention in combination with other conventional thread transporting apparatus and especially in a so-called draw-twist or stretch-twist machine permits very high speed operation with a corresponding improvement in production capacity.
  • the false-twist roller itself is light in weight and easily constructed so that it will rotate freely at high speeds in frictional contact with the running thread. With a relatively long free path of the thread both before and after the false-twist roller, there are no other parts or thread contacting elements which can interfere with the smooth and trouble-free operation of the single roller.
  • the rotational velocity of the roller according to the invention is self-regulating and there is a minimum of thread slippage or loss of twisting so that very uniformly texturized filaments or threads can be obtained when processing preferred synthetic thermoplastic fibrous polymer filaments in an otherwise conventional manner.
  • F alse-twist apparatus for the threatment of a continuous monofilament or multifilament thread composed of a linear fibrous high molecular weight polymer which apparatus comprises:
  • means to transport said thread in a substantially linear path including means to withdraw said thread from a feed source at a controlled rate;
  • a frictional false-twist device consisting of a single freely rotatable roller arranged with its axis of rotation obliquely to said linear thread path in order to receive said thread in a single spiral loop therearound, said freely rotatable roller having a concave thread contact surface which is a surface of revolution.
  • False-twist apparatus as claimed in claim 1 wherein said concave thread contact surface of said freely rotatable roller is an arcuate surface symmetrical with respect to a plane perpendicular to the roller axis of rotation at the center of said roller axis.
  • False-twist apparatus as claimed in claim 1 wherein the thread contact surface is roughened to a de th f about2to8microns.
  • alse-twist apparatus as claimed in claim 1 wherein aid thread contact surface has a hard dull chrome finish.
  • False-twist apparatus as claimed in claim 2 whereinthe thread contact surface is roughened to a depth of about 2 to 8 microns andhas a hard dull chrome finish.
  • False-twist apparatus as claimed in claim 1 wherein said thread withdrawal means is a stretching godet and guide roller assembly arranged to receive said thread directly from said freely rotatable roller.
  • False-twist apparatus as claimed in claim 1 including heating means for heating said thread as it is transported in said linear thread path leading up to said freely rotatable roller, said heating means being separated from said freely rotatable roller'by a distance sufficient to permit cooling of the thread and fixation of the twist wherein said heating means is arranged to transport the thread directly therefrom in said linear path to said freely rotatable roller and said thread withdrawal means is arranged to receive said thread directly in said linear path from said freely rotatable roller.
  • False-twist apparatus as claimed in claim 9 wherein said thread withdrawal means is a stretching godet and guide roller assembly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US83894A 1969-10-27 1970-10-26 False twisting apparatus Expired - Lifetime US3680302A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE6941966U DE6941966U (de) 1969-10-27 1969-10-27 Vorrichtung zum falschdrallen von monofilen oder endlosgarnen

Publications (1)

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US3680302A true US3680302A (en) 1972-08-01

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ID=6606006

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Application Number Title Priority Date Filing Date
US83894A Expired - Lifetime US3680302A (en) 1969-10-27 1970-10-26 False twisting apparatus

Country Status (10)

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US (1) US3680302A (de)
AT (1) AT311219B (de)
BE (1) BE754695A (de)
CH (1) CH504553A (de)
DE (1) DE6941966U (de)
ES (1) ES382827A1 (de)
FR (1) FR2066694A5 (de)
GB (1) GB1267893A (de)
LU (1) LU61848A1 (de)
NL (1) NL7012101A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3782090A (en) * 1971-12-08 1974-01-01 Chadbourn Inc Method and apparatus for producing textured yarn
US4425691A (en) 1982-04-30 1984-01-17 Stanley Backer Fabric forming process
US4478037A (en) * 1982-07-16 1984-10-23 Stanley Backer Twisting method and apparatus
US4562694A (en) * 1983-07-07 1986-01-07 Sumar Cesar P Device for attachment to drawtwister machines to produce multifilament yarns with S or Z twist effect
US4956970A (en) * 1987-10-23 1990-09-18 Barmag Ag False twist roll
US6226972B1 (en) 1997-12-10 2001-05-08 Izumi International, Inc. Twisted union yarn manufacturing method and device
CN103590151A (zh) * 2013-11-26 2014-02-19 昌吉溢达纺织有限公司 假捻装置
CN103668594A (zh) * 2012-09-20 2014-03-26 际华三五四二纺织有限公司 旋转杆型假捻转子
USD869515S1 (en) * 2017-08-03 2019-12-10 Asahi Kasei Kabushiki Kaisha Bobbin with wound thread

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2443238C3 (de) * 1974-09-10 1987-07-09 FAG Kugelfischer Georg Schäfer KGaA, 8720 Schweinfurt Reibrotor zum Friktionsfalschdrallen von synthetischen Fäden
GB8611073D0 (en) * 1986-05-07 1986-06-11 Rieter Scragg Ltd False twist apparatus
JP2580316B2 (ja) * 1989-02-13 1997-02-12 村田機械株式会社 糸の仮撚方法及びその仮撚装置
DE102019101144A1 (de) * 2019-01-17 2020-07-23 Maschinenfabrik Rieter Ag Verfahren zur Falschdrahteinleitung in einen Faden und Spinnmaschine sowie Vorrichtung zur Falschdrahteinleitung in einen Faden
DE102020118327A1 (de) 2020-07-10 2022-01-13 Maschinenfabrik Rieter Ag Verfahren und Vorrichtung zur Falschdrahteinleitung sowie Spinnmaschine
DE102022100422A1 (de) 2022-01-10 2023-07-13 Maschinenfabrik Rieter Ag Verfahren und Vorrichtung zur Falschdrahteinleitung sowie Spinnmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2410419A (en) * 1943-08-19 1946-11-05 Du Pont Snubber roller
US2718111A (en) * 1951-06-25 1955-09-20 Clemson Agricultural College O Yarn twister for spinning frames
US3026668A (en) * 1962-03-27 Method and apparatus for handling cables
US3470583A (en) * 1964-07-02 1969-10-07 Celanese Corp False twisting
US3559391A (en) * 1968-06-28 1971-02-02 American Enka Corp Production of torque yarn

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026668A (en) * 1962-03-27 Method and apparatus for handling cables
US2410419A (en) * 1943-08-19 1946-11-05 Du Pont Snubber roller
US2718111A (en) * 1951-06-25 1955-09-20 Clemson Agricultural College O Yarn twister for spinning frames
US3470583A (en) * 1964-07-02 1969-10-07 Celanese Corp False twisting
US3559391A (en) * 1968-06-28 1971-02-02 American Enka Corp Production of torque yarn

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3782090A (en) * 1971-12-08 1974-01-01 Chadbourn Inc Method and apparatus for producing textured yarn
US4425691A (en) 1982-04-30 1984-01-17 Stanley Backer Fabric forming process
US4478037A (en) * 1982-07-16 1984-10-23 Stanley Backer Twisting method and apparatus
US4562694A (en) * 1983-07-07 1986-01-07 Sumar Cesar P Device for attachment to drawtwister machines to produce multifilament yarns with S or Z twist effect
US4956970A (en) * 1987-10-23 1990-09-18 Barmag Ag False twist roll
US6226972B1 (en) 1997-12-10 2001-05-08 Izumi International, Inc. Twisted union yarn manufacturing method and device
CN103668594A (zh) * 2012-09-20 2014-03-26 际华三五四二纺织有限公司 旋转杆型假捻转子
CN103668594B (zh) * 2012-09-20 2016-08-10 际华三五四二纺织有限公司 旋转杆型假捻转子
CN103590151A (zh) * 2013-11-26 2014-02-19 昌吉溢达纺织有限公司 假捻装置
USD869515S1 (en) * 2017-08-03 2019-12-10 Asahi Kasei Kabushiki Kaisha Bobbin with wound thread
USD870160S1 (en) * 2017-08-03 2019-12-17 Asahi Kasei Kabushiki Kaisha Bobbin with wound thread

Also Published As

Publication number Publication date
DE6941966U (de) 1970-03-19
LU61848A1 (de) 1971-05-04
GB1267893A (en) 1972-03-22
AT311219B (de) 1973-11-12
ES382827A1 (es) 1972-11-16
FR2066694A5 (de) 1971-08-06
CH504553A (de) 1971-03-15
NL7012101A (de) 1971-05-04
BE754695A (fr) 1971-01-18

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