US3756006A - False-twist arrangement - Google Patents

False-twist arrangement Download PDF

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Publication number
US3756006A
US3756006A US00112643A US3756006DA US3756006A US 3756006 A US3756006 A US 3756006A US 00112643 A US00112643 A US 00112643A US 3756006D A US3756006D A US 3756006DA US 3756006 A US3756006 A US 3756006A
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US
United States
Prior art keywords
outlet
inlet
edge
annular bead
tube
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Expired - Lifetime
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US00112643A
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English (en)
Inventor
H Bach
R Dauscher
H Jurischka
K Heinroth
H Neumann
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Bayer AG
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Bayer AG
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Publication date
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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
    • D02G1/04—Devices for imparting false twist
    • D02G1/08—Rollers or other friction causing elements

Definitions

  • ABSTRACT [30] Foreign Application Priority Data Feb. 19, I970 Germany P 20 07 508.5
  • a false-twist arrangement is used which com- [52] US. Cl. 57/77.4 prises a rotary tube provided on the entry side with an [51] Int. Cl.
  • the present invention relates to a false-twist arrangement for the production of synthetic, texturised fine yarns or filaments, comprising a rotary tube which is provided on its entry side with an annular bead of which the opening diameter is smaller than the internal diameter of the rotary tube, and thread guides.
  • German Specification No. 1,435,514 shows a rotary tube which is formed with annular beads, the surfaces of which have a high coefficient of friction.
  • German Auslegeschrift No. 1,205,652 shows a rotary tube which is formed with annular beads, the surfaces of which have a high coefficient of friction.
  • the rotary tube is lined with a bushing which has ends which widen out, the bushing having a smooth, convex, internal surface and being of a material with a high coefficient of friction.
  • the entry and exit angles of the filament are between 45 and 90.
  • Rubber is used as the material for the annular beads or bushing. It is understandable that the frictional coefficient may change since this material is subjected to heavy wear. The uniformity of the texturising twist is then no longer guaranteed. In addition, the rubber dust can adhere to the treated filament and soil the latter.
  • a false-twist arrangement is also known from German Patent Specification No. 185,580, in which the filament is drawn off by means of a ring-type winding means as a balloon from the feed rolls.
  • the false-twist arrangement is disposed between the feed rolls and the ring-winding means so that the filament thrown out in the manner of a balloon bears on the entry and exit beads of the false-twist arrangement.
  • the entry bead consists of ribbed cast iron, in order to increase the friction and the exit portion consists of steel.
  • this arrangement can only be used for the manufacture of weakly texturised filaments, because there is only a low filament tension. The ribbing on the entry bead applies a very strong load to the filament and can damage it.
  • the object of this invention is to produce texturised fine yarns or filaments with at least 1,500 false twists per metre, without any fluctuations in the texturising or damage to the filament, by using a device which is of a simple construction and which is independent of wear as regards its action.
  • This object is achieved according to the invention by using an arrangement comprising an annular bead with a rounded, highly polished edge, thread guides being so arranged that the filament or tow of filaments contacts the rotary tube only at the highly polished edge and encloses between the entry and exit directions an angle a of more than 90.
  • the effect hereby achieved is that, even with wear on the edge of the annular bead of the rotary tube, the texturising of the filament is not subject to any fluctuations, since the highly polished edge of the bead guarantees a constant twisting action, because the sliding friction of the filament can scarcely change the surface of the edge.
  • the use as known per se of thread guides ensures a constant thread tension during the passage thereof through the false-twist arrangement.
  • the texturising speed can be kept very high.
  • the false-twist arrangement according to the invention is suitable for the texturising of filaments or tows of filaments consisting of fully synthetic high polymers, more especially polyamides, of high molecular weight, linear polyesters and of acrylonitrile polymers.
  • One particular constructional embodiment of the false-twist arrangement according to the invention in particular for the production of multi-filament crimped yarns, is characterised in that the exit side of the rotary tube is also provided with an annular bead, which has a rounded, highly polished edge, and the filament or tow of filaments is guided diagonally through the rotary tube, and also bears against the annular bead on the exit side of the rotary tube.
  • the rotary tube can be made as a one-part, turned element.
  • the annular head on the exit side is, however, formed as a member which can be fitted and which can, for example, be connected by a screw-threaded connection to the rotary tube which is provided on the entry side with an annular bead. In this way, the actual rotary tube can be used for different texturising processes.
  • a metal and in particular steel is to be considered as suitable for the rotary tube and for the annular beads, but chemical materials based on polyurethane which have a high resistance to wear can also be considered.
  • FIG. 2 shows an arrangement with an additional annular head on the exit side of the rotary tube.
  • the false-twist arrangement consists of a bearing member 1 in which are supported ball-bearings 2 on which is mounted a steel rotary tube 3.
  • the rotary tube projects on one side far beyond the bearing member l and is provided with an annular keyway 4, through which runs a driving belt 5.
  • Formed on the end of the projecting rotary tube 3 is an annular bead 6 with a highly polished edge 7, against which bears the filament 8 which is to be texturised.
  • the opening diameter 11,, of the annular bead 6 is smaller than the internal diameter d,, of the rotary tube 3, so that the filament 8 leaves the rotary tube 3 without touching the latter.
  • the end face of the rotary tube 3 is set back from the highly polished edge 7 in an outward direction, so that the filament 8 only bears on the edge 7.
  • the entering thread or filament 8 forms an angle of 10 with the perpendicular to the axis of rotation of the tube 3.
  • the exit angle of the thread 8, measured between the thread 8 and an axis parallel to the edge 7, is 20, corresponding to the setting of a thread guide 11 arranged on the exit side. Therefore, between the entry direction and exit direction, the thread 8 encloses an angle a of 100.
  • the annular bead 6 on the entry side has a highly polished edge 7, against which the thread 8 bears.
  • the end face 9 is set back towards the rim.
  • the thread guide on the entry side is so arranged that the entering thread or filament 8 encloses an angle of 10 with the perpendicular to the axis of rotation of the rotary tube 3.
  • a second steel annular bead 12 which is constructed as a fitting and is connected by a screw-threaded connection 13 to the rotary tube 3. It also has a highly polished edge 14.
  • the opening diameters d and d, of the annular beads 6 and 12 on the entry and exit sides correspond to each other and are smaller than the internal diameter d of the rotary tube 3.
  • the discharge angle of the thread 8 from the edge 7 corresponds to the supply angle for the edge 14, because the thread 8 is guided diagonally through the rotary tube 3.
  • the angle a, which is enclosed by the thread 8 guided around the edge 7, is 100.
  • the thread 8 encloses an angle a which is also 100 with the deflection around the edge 14, due to suitable setting of the thread guide 10 on the exit side.
  • the discharge angle of the thread 8 from the edge 14 is accordingly also 10, like the supply angle to the edge 7.
  • the thread or bundle of threads 8 is rotated in the S- direction, and on the edge 14 in the Z-direction.
  • Example 1 A polyamide monofilament (polyamide 6 dtex 20/1) is stretched in the ratio 1:35 in a drafting mechanism and is guided at a temperature of 170C. through a heated zone into the false-twist arrangement according to the invention, as shown in FIG. 1 with a filament speed of 500 m/min.
  • the rotary tube is rotating at Example 2
  • a polyester multi-filament (dtex 22/3) is stretched by means of a drafting mechanism in the ratio 1:40 and is guided at a temperature of 200 C. through a heated zone into the false-twist arrangement according to the invention as shown in FIG. 1, with a filament speed of 400 mlmin.
  • the tube is rotating at 14,000 r.p.m.
  • the radius of the highly polished edge of the annular bead is 3.0 mm and the opening diameter of this bead is 30 mm.
  • the angle enclosed by the filament deflected on the edge is and the entry angle, measured in relation to the perpendicular to the axis of rotation of the rotary tube, is 15.
  • the texturised filament shows a curl value of 260 twists per metre.
  • Example 3 A polyamide multi-filament (polyamide 6.6, dtex 33/6) is stretched in a drafting mechanism in the ratio 1:3.6 and is guided at a temperature of 170 C. through a heated zone into the false-twist arrangement according to the invention in accordance with the constructional example shown in FIG. 2, with a filament speed of 550 mlmin.
  • the speed of rotation of the rotary tube is 14,500 r.p.m.
  • the highly polished edges of the annular heads have a radius of 4.0 mm.
  • the opening diameter of the annular beads is 28 mm.
  • the filament travels at an angle of 10 to the perpendicular to the axis of rotation of the rotary tube into the arrangement and leaves the latter at the same angle.
  • the angles enclosed by the filament at the entry edge and the exit edge are in each case.
  • the curl value of this material is on average 480 twists per metre.
  • the material has a coldwater shrinkage of 55-66 percent.
  • Apparatus suitable for false twisting of synthetic elements such as yarns or filaments comprising:
  • a hollow rotatably mounted tube having an inlet end for receiving the element and an outlet end for exiting of the element, and an inwardly extending annular bead at the inlet end providing an inlet edge having a diameter smaller than the internal diameter of the tube, said inlet edge being rounded and highly polished,
  • an inlet roller and an outlet roller disposed, respectively, adjacent the inlet end and outlet end of the tube, for guiding the element first over the edge of the annular bead in contact therewith so that at the inlet end the element contacts only said edge, through the tube and out the outlet end thereof, and so that the element on either side of the inlet edge defines an angle a of more than 90.
  • the hollow tube having an inlet end face extending radially outwardly from the annular bead and set back from the annular bead in the direction of travel of the element through the tube.
  • Apparatus suitable for false twisting of synthetic elements such as yarns or filaments comprising:
  • a hollow rotatably mounted tube having an inlet end for receiving the element and an outlet end for exiting of the element, and an inwardly extending annular bead at the inlet end and at the outlet end providing an inlet edge and an outlet edge having a diameter smaller than the internal diameter of the tube, said inlet edge and outlet edge being rounded and highly polished,
  • an inlet roller and an outlet roller disposed, respectively, adjacent the inlet end and outlet end of the tube, for guiding the element first over the edge of the annular bead at the inlet end in contact therewith so that at the inlet end the element contacts only said edge, through the tube and out the outlet end thereof, over the edge of the annular bead at the outlet end in contact therewith so that at the outlet end the element contacts only said edge, and so that the element on either side of the inlet edge defines an angle a of more than 90.
  • the hollow tube having an inlet end face and an outlet face extending radially outwardly from, respectively, the inlet annular bead and the outlet annular bead, the end faces being set back from the annular beads towards the body of the hollow cylinder.
  • the hollow cylinder comprising a body portion and an outlet end member detachably mounted on the body portion, said outlet end member comprising said outlet annular bead.
  • the hollow cylinder comprising a body portion and an outlet end member detachably mounted on the body portion, said outlet end member comprising said outlet annular bead.
  • the hollow cylinder comprising a body portion and an outlet end member detachably mounted on the body portion, said outlet end member comprising said outlet annular bead.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US00112643A 1970-02-19 1971-02-04 False-twist arrangement Expired - Lifetime US3756006A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2007508A DE2007508C3 (de) 1970-02-19 1970-02-19 Falschdrallvorrichtung

Publications (1)

Publication Number Publication Date
US3756006A true US3756006A (en) 1973-09-04

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ID=5762646

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US00112643A Expired - Lifetime US3756006A (en) 1970-02-19 1971-02-04 False-twist arrangement

Country Status (8)

Country Link
US (1) US3756006A (de)
AT (1) AT316367B (de)
BE (1) BE763212A (de)
CH (1) CH517846A (de)
DE (1) DE2007508C3 (de)
FR (1) FR2081019B1 (de)
GB (1) GB1346818A (de)
NL (1) NL7102173A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875734A (en) * 1972-02-08 1975-04-08 Dupeuble Jean Claude Friction false twisting device
US3943693A (en) * 1973-10-01 1976-03-16 Heberlein Maschinenfabrik Ag. Apparatus for false-twist texturing of textile yarns
US4034548A (en) * 1974-05-10 1977-07-12 Bayer Aktiengesellschaft Process for the production of stretch-textured yarns with improved properties
US5901544A (en) * 1994-08-26 1999-05-11 Caress Yarns, Inc. Method and apparatus for producing randomly variegated multiple strand twisted yarn and yarn and fabric made by said method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3066473A (en) * 1960-03-23 1962-12-04 Maeda Yutaka Apparatus and method for imparting twist and crimp to textile yarns
US3094834A (en) * 1959-07-03 1963-06-25 British Nylon Spinners Ltd Apparatus for simultaneously stretching and falsetwisting yarn
US3478506A (en) * 1966-12-24 1969-11-18 Kanichi Kawashima Method of manufacturing a yarn
US3564833A (en) * 1968-01-30 1971-02-23 Ici Ltd Friction false twisting
US3668855A (en) * 1970-06-22 1972-06-13 Leesona Corp Twister and method of twisting
US3668856A (en) * 1970-11-16 1972-06-13 Leesona Corp Friction twister element

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3094834A (en) * 1959-07-03 1963-06-25 British Nylon Spinners Ltd Apparatus for simultaneously stretching and falsetwisting yarn
US3066473A (en) * 1960-03-23 1962-12-04 Maeda Yutaka Apparatus and method for imparting twist and crimp to textile yarns
US3478506A (en) * 1966-12-24 1969-11-18 Kanichi Kawashima Method of manufacturing a yarn
US3564833A (en) * 1968-01-30 1971-02-23 Ici Ltd Friction false twisting
US3668855A (en) * 1970-06-22 1972-06-13 Leesona Corp Twister and method of twisting
US3668856A (en) * 1970-11-16 1972-06-13 Leesona Corp Friction twister element

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875734A (en) * 1972-02-08 1975-04-08 Dupeuble Jean Claude Friction false twisting device
US3943693A (en) * 1973-10-01 1976-03-16 Heberlein Maschinenfabrik Ag. Apparatus for false-twist texturing of textile yarns
US4034548A (en) * 1974-05-10 1977-07-12 Bayer Aktiengesellschaft Process for the production of stretch-textured yarns with improved properties
US5901544A (en) * 1994-08-26 1999-05-11 Caress Yarns, Inc. Method and apparatus for producing randomly variegated multiple strand twisted yarn and yarn and fabric made by said method

Also Published As

Publication number Publication date
FR2081019B1 (de) 1976-02-06
FR2081019A1 (de) 1971-11-26
DE2007508A1 (de) 1971-08-26
BE763212A (fr) 1971-07-16
CH517846A (de) 1972-01-15
DE2007508B2 (de) 1975-02-20
GB1346818A (en) 1974-02-13
AT316367B (de) 1974-07-10
DE2007508C3 (de) 1975-10-16
NL7102173A (de) 1971-08-23

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