US3813867A - Device for producing false twist on a thermoplastic filament - Google Patents

Device for producing false twist on a thermoplastic filament Download PDF

Info

Publication number
US3813867A
US3813867A US00241271A US24127172A US3813867A US 3813867 A US3813867 A US 3813867A US 00241271 A US00241271 A US 00241271A US 24127172 A US24127172 A US 24127172A US 3813867 A US3813867 A US 3813867A
Authority
US
United States
Prior art keywords
belt
filament
bend
produced
roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00241271A
Inventor
O Ivanto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SPINNER OSAKEYHTIO SF
Original Assignee
Spinner Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Spinner Oy filed Critical Spinner Oy
Priority to US00241271A priority Critical patent/US3813867A/en
Application granted granted Critical
Publication of US3813867A publication Critical patent/US3813867A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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 A device for producing a false twist on a thermoplastic filament which, heated to a plastic condition, is on its path of travel made to touch an endless belt moving transversally with reference to it, and which belt has high friction against the filament and has been conducted over a pulley imparting a motion to it.
  • the belt forms at this point a sharp bend, which prevents the hunting of the filament.
  • the aim of the present invention is to eliminate these drawbacks.
  • the objects of the invention is therefore a device for forming a false twist on a thermoplastic filament, which, heated to a plastic condition, is on its travel made to touch an endless belt moving transversally with reference to it, this belt having high friction against the filament and being carried over a pulley by which it is imparted a movement.
  • the invention is characterized in that, in order to stabilize the point of contact between the filament and the belt, the belt forms at this point a sharp bend, which prevents the hunting of the filament.
  • the speed of the belt, and correspondingly the speed of the filament can be considerably increased, because the risk of filament rupture has been reduced.
  • the. thread that is obtained has a homogeneous quality.
  • FIG. 6 shows the embodiment according to FIG. 5, seen from one side.
  • the reference numeral 1 indicates a friction belt loop that has been passed over a pulley, which imparts a motion to it.
  • the speed of rotation of the pulley 2, and thereby also the translatory speed of the belt 1, is high.
  • the belt 1, which may consist e.g. of plastic, has a circular cross section.
  • the filament 3 heated to a plastic condition, has been conducted, and this filament is subject to a tensile stress so that a sharp bend 4 of the belt 1 is formed.
  • the point of contact of the filament 3 and belt 1 will be stabilized so that the filament 3 cannot hunt along the belt 1.
  • the filament 3 and belt 1 both progress with a high speed, a false twist is produced in the filament as a result of friction. Since in the embodiment according to FIG. 1 a comparatively high tensile stress is produced in the filament 3, it is obvious that this embodiment cannot be employed when the filament is thin.
  • the embodiment according to FIG. 2 may be used for the curling of thin filaments also.
  • This embodiment differs from that presented in the foregoing in that in the belt 1 a bend 4 is produced with the aid of freely rotating rolls 5, which guide the belt ll.
  • a bend is produced in the belt 1 by the aid of a freely rotating roll 6, which places tension on the belt.
  • the surface of the roll 6 has low friction with regard to the filament 3.
  • the filament is conducted into the gap between the belt 1 and the roll 6 from such direction that it touches both the belt and the roll.
  • the point where the filament 3 touches the belt 1 will be accurately determined.
  • the bend 4 in the belt 1 is produced by the aid of a magnet 7, which attracts the belt.
  • the belt consists of a magnetic material, e.g. of plastic with metal powder admixture.
  • the pulley 2 may also be made magnetic, whereby the friction between it and the belt 1 is improved.
  • the bend 4b in the belt 1 is produced by means of an air nozzle 8, which by compressed air effect pushes against the belt.
  • the air nozzle 8 has a groove 8 for the belt, with a slit on its bottom through which compressed air is supplied so that an air cushion is produced between the groove and the belt, which keeps the belt at a distance from the groove. Furthermore, the nozzle 8 has a transversal groove 10 at the point where the'filament 3 and the belt 1 come into contact.
  • the belt 1 may have a cross section other than circular. Most appropriately, the path of contact between the filament 3 and the belt 1 is curved.
  • thermoplastic filament which, heated to a plastic condition, is on its path of travel made to touch an endless belt moving transversally with reference to it, and which belt has high friction against the filament and has been conducted over a pulley imparting a motion to it, wherein the improvement comprises that for stabilizing the point of contact between the filament and belt the belt forms at this point a sharp bend, which prevents the hunting of the filament.
  • Device characterized in that the bend in the belt is produced by elements guiding the belt, such as freely rotating rolls.
  • Device characterized in that the bend in the belt is produced by a magnet attracting the belt and that the belt, to this purpose, consists of a filament.
  • the air nozzle has for the belt a groove having in its bottom a slit, through which compressed air is supplied so that between the groove and the belt an air cushion is formed, which keeps the belt at a distance from the groove.

Landscapes

  • 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)

Abstract

A device for producing a false twist on a thermoplastic filament which, heated to a plastic condition, is on its path of travel made to touch an endless belt moving transversally with reference to it, and which belt has high friction against the filament and has been conducted over a pulley imparting a motion to it. For stabilizing the point of contact between the filament and belt the belt forms at this point a sharp bend, which prevents the hunting of the filament.

Description

United States Patet n91 Ivanto June 4, 1974 DEVICE FOR PRODUCING FALSE TWIST ON A THERMOPLASTIC FILAMlENT [75] Inventor: Osmo .Iuhani Ivanto, Otaniemi,
. Finland [73] Assignee: Spinner Osakeyhtio, Karakallio,
Finland [22] .Filed: Apr. 5, 1972 [21] Appl. No.: 241,271
[52] US. Cl. 57/77.4
[51] Int. Cl D02g 1/02 [58] Field of Search 57/34 R, 34 HS, 77.3, 77.4, 57/7745 [56] References Cited UNITED STATES PATENTS 3,045,416 7/1962 Ubbelohde 57/7745 3,035,396 5/1962 Biggers 57/773 x Brown 57/77.4
2,908,133 10/1959 3,103,097 9/1963 Meili et al 57/77.4
3,021,663 2/1962 Findlow l 57/77.4 3,228,181 1/1966 Paterson 57/77.4 X
Primary Examiner-Donald E. Watkins Attorney, Agent, or Firm-Eric H. Waters [5 7 ABSTRACT A device for producing a false twist on a thermoplastic filament which, heated to a plastic condition, is on its path of travel made to touch an endless belt moving transversally with reference to it, and which belt has high friction against the filament and has been conducted over a pulley imparting a motion to it. For stabilizing the point of contact between the filament and belt the belt forms at this point a sharp bend, which prevents the hunting of the filament.
8 Claims, 6 Drawing Figures DEVICE FDR PRODUCING FALSE TWEST GN A THERMOKLASTHC FELAMENT It is known in prior art to produce false twist on a thermoplastic filament which, heated to a plastic condition, is conducted through a sleeve rotating about its axis and the ends or entire inner surface of which has been provided wiht a friction surface, which is touched by the filament. Such curling sleeves work excellently, but their capacity is limited because the speed of rota tion of the sleeve cannot be increased at will.
In order to eliminate this drawback, it has already been suggested to cause the filament that has been heated to a plastic condition, in the course of its travel, to touch an endless belt moving transversally with reference to it and which belt has high friction with the filament and has been carried over a pulley, by which a motion is imparted to it. The speed of the belt can be made very high, whereby the capacity of the device increases correspondingly. But then one encounters the difficulty that the filament begins to oscillate, or hunt, along the belt. in other words, the point of contact between the filament and the belt performs a continuous reciprocal movement. This, in its turn, has the consequence that the curled filament will be non-uniform as regards its quality. Moreover, the tension of the filament, as it contacts the belt, will continuously vary and may become so high as to cause rupture of the filament.
The aim of the present invention is to eliminate these drawbacks. The objects of the invention is therefore a device for forming a false twist on a thermoplastic filament, which, heated to a plastic condition, is on its travel made to touch an endless belt moving transversally with reference to it, this belt having high friction against the filament and being carried over a pulley by which it is imparted a movement. The invention is characterized in that, in order to stabilize the point of contact between the filament and the belt, the belt forms at this point a sharp bend, which prevents the hunting of the filament. By the aid of the invention the speed of the belt, and correspondingly the speed of the filament, can be considerably increased, because the risk of filament rupture has been reduced. Moreover, the. thread that is obtained has a homogeneous quality.
The invention is described in the following with the aid of an example and with reference to the attached drawing, wherein FlGS. 1-5 show various embodiments of the invention, and
FIG. 6 shows the embodiment according to FIG. 5, seen from one side.
in FIG. 1, the reference numeral 1 indicates a friction belt loop that has been passed over a pulley, which imparts a motion to it. The speed of rotation of the pulley 2, and thereby also the translatory speed of the belt 1, is high. The belt 1, which may consist e.g. of plastic, has a circular cross section. Through the belt loop I the filament 3, heated to a plastic condition, has been conducted, and this filament is subject to a tensile stress so that a sharp bend 4 of the belt 1 is formed. As a result of the bend 4, the point of contact of the filament 3 and belt 1 will be stabilized so that the filament 3 cannot hunt along the belt 1. When the filament 3 and belt 1 both progress with a high speed, a false twist is produced in the filament as a result of friction. Since in the embodiment according to FIG. 1 a comparatively high tensile stress is produced in the filament 3, it is obvious that this embodiment cannot be employed when the filament is thin.
The embodiment according to FIG. 2, however, may be used for the curling of thin filaments also. This embodiment differs from that presented in the foregoing in that in the belt 1 a bend 4 is produced with the aid of freely rotating rolls 5, which guide the belt ll.
According to FIG. 3, again, a bend is produced in the belt 1 by the aid of a freely rotating roll 6, which places tension on the belt. The surface of the roll 6 has low friction with regard to the filament 3. The filament is conducted into the gap between the belt 1 and the roll 6 from such direction that it touches both the belt and the roll. Hereby, the point where the filament 3 touches the belt 1 will be accurately determined.
According to FIG. 4, the bend 4 in the belt 1 is produced by the aid of a magnet 7, which attracts the belt. To this purpose, the belt consists of a magnetic material, e.g. of plastic with metal powder admixture. In this case the pulley 2 may also be made magnetic, whereby the friction between it and the belt 1 is improved.
According to FIGS. 5 and 6, the bend 4b in the belt 1 is produced by means of an air nozzle 8, which by compressed air effect pushes against the belt. The air nozzle 8 has a groove 8 for the belt, with a slit on its bottom through which compressed air is supplied so that an air cushion is produced between the groove and the belt, which keeps the belt at a distance from the groove. Furthermore, the nozzle 8 has a transversal groove 10 at the point where the'filament 3 and the belt 1 come into contact.
lt is obvious to one skilled in the art that different em bodiments of the invention may vary within the scope of the patent claims set forth hereinafter. For instance, the belt 1 may have a cross section other than circular. Most appropriately, the path of contact between the filament 3 and the belt 1 is curved.
I claim:
1. Improvement in a device for producing a false twist on a thermoplastic filament which, heated to a plastic condition, is on its path of travel made to touch an endless belt moving transversally with reference to it, and which belt has high friction against the filament and has been conducted over a pulley imparting a motion to it, wherein the improvement comprises that for stabilizing the point of contact between the filament and belt the belt forms at this point a sharp bend, which prevents the hunting of the filament.
2. Device according to claim 1, characterized in that the bend in the belt is produced by traction caused by.
the filament.
3. Device according to claim 1, characterized in that the bend in the belt is produced by elements guiding the belt, such as freely rotating rolls.
4. Device according to claim 1, characterized in that the bend in the belt is produced by a freely rotating roll placing tension on the belt, which roll has low friction against the filament, and that the filament has been conducted into the gap between the belt and the roll from such a direction that it touches both the belt and the roll.
5. Device according to claim 1, characterized in that the bend in the belt is produced by a magnet attracting the belt and that the belt, to this purpose, consists of a filament.
8. Device according to claim 7, characterized in that the air nozzle has for the belt a groove having in its bottom a slit, through which compressed air is supplied so that between the groove and the belt an air cushion is formed, which keeps the belt at a distance from the groove.

Claims (8)

1. Improvement in a device for producing a false twist on a thermoplastic filament which, heated to a plastic condition, is on its path of travel made to touch an endless belt moving transversally with reference to it, and which belt has high friction against the filament and has been conducted over a pulley imparting a motion to it, wherein the improvement comprises that for stabilizing the point of contact between the filament and belt the belt forms at this point a sharp bend, which prevents the hunting of the filament.
2. Device according to claim 1, characterized in that the bend in the belt is produced by traction caused by the filament.
3. Device according to claim 1, characterized in that the bend in the belt is produced by elements guiding the belt, such as freely rotating rolls.
4. Device according to claim 1, characterized in that the bend in the belt is produced by a freely rotating roll placing tension on the belt, which roll has low friction against the filament, and that the filament has been conducted into the gap between the belt and the roll from such a direction that it touches both the belt and the roll.
5. Device according to claim 1, characterized in that the bend in the belt is produced by a magnet attracting the belt and that the belt, to this purpose, consists of a magnetic material, for instance of plastic with metal powder admixture.
6. Device according to claim 5, characterized in that the pulley is magnetic for improvement of the friction between it and the belt.
7. Device according to claim 1, chaRacterized in that the bend in the belt is produced by an air nozzle, which by compressed air effect pushes the belt towards the filament.
8. Device according to claim 7, characterized in that the air nozzle has for the belt a groove having in its bottom a slit, through which compressed air is supplied so that between the groove and the belt an air cushion is formed, which keeps the belt at a distance from the groove.
US00241271A 1972-04-05 1972-04-05 Device for producing false twist on a thermoplastic filament Expired - Lifetime US3813867A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US00241271A US3813867A (en) 1972-04-05 1972-04-05 Device for producing false twist on a thermoplastic filament

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00241271A US3813867A (en) 1972-04-05 1972-04-05 Device for producing false twist on a thermoplastic filament

Publications (1)

Publication Number Publication Date
US3813867A true US3813867A (en) 1974-06-04

Family

ID=22909984

Family Applications (1)

Application Number Title Priority Date Filing Date
US00241271A Expired - Lifetime US3813867A (en) 1972-04-05 1972-04-05 Device for producing false twist on a thermoplastic filament

Country Status (1)

Country Link
US (1) US3813867A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948034A (en) * 1973-04-27 1976-04-06 Imperial Chemical Industries Limited False twisting filamentary yarns
KR101024032B1 (en) * 2008-11-27 2011-03-23 대한민국 Method for Analysis of Haplotype of CYP2E1

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2908133A (en) * 1956-08-09 1959-10-13 Clemson Agricultural College O False twister
US3021663A (en) * 1956-11-03 1962-02-20 Scragg & Sons Apparatus for false twisting yarn
US3035396A (en) * 1957-08-21 1962-05-22 Patentex Inc Torque low twist yarn and machine and method for producing the same
US3045416A (en) * 1958-09-15 1962-07-24 Ubbelohde Leo False twisting device
US3103097A (en) * 1959-11-28 1963-09-10 Heberlein Patent Corp Yarn twisting apparatus
US3228181A (en) * 1963-03-22 1966-01-11 British Nylon Spinners Ltd Production of yarns with varying twist

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2908133A (en) * 1956-08-09 1959-10-13 Clemson Agricultural College O False twister
US3021663A (en) * 1956-11-03 1962-02-20 Scragg & Sons Apparatus for false twisting yarn
US3035396A (en) * 1957-08-21 1962-05-22 Patentex Inc Torque low twist yarn and machine and method for producing the same
US3045416A (en) * 1958-09-15 1962-07-24 Ubbelohde Leo False twisting device
US3103097A (en) * 1959-11-28 1963-09-10 Heberlein Patent Corp Yarn twisting apparatus
US3228181A (en) * 1963-03-22 1966-01-11 British Nylon Spinners Ltd Production of yarns with varying twist

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948034A (en) * 1973-04-27 1976-04-06 Imperial Chemical Industries Limited False twisting filamentary yarns
KR101024032B1 (en) * 2008-11-27 2011-03-23 대한민국 Method for Analysis of Haplotype of CYP2E1

Similar Documents

Publication Publication Date Title
US2931090A (en) Textile apparatus
US3813867A (en) Device for producing false twist on a thermoplastic filament
US3685268A (en) Method and apparatus for use in the production of fancy yarns
US3228181A (en) Production of yarns with varying twist
US2517067A (en) Overfeed and internal expander for fabric in tubular form
GB1000030A (en) Improvements in or relating to the treatment of yarns and filaments by pressure rolls
US3530214A (en) Method for treating textile materials to uniformly set their shape
US3685273A (en) Method and apparatus for false twisting textile yarns and product obtained thereby
ES2018698B3 (en) PROCEDURE AND DEVICE TO SATIN AND SHRINK TEXTILE GENEROS
US3710460A (en) Yarn treating jet having a guide fastened to its outlet end
US3154906A (en) Apparatus for false-twisting thermoplastic yarn
US3427654A (en) Method and apparatus for production of split fibers
US4192128A (en) Thread deflecting element for a draw-texturing machine
US3394439A (en) Method and apparatus for bunching yarn
US3372848A (en) Feed roll assembly separable in response to thread depletion
US3137912A (en) Apparatus for producing intermittent edge-crimped yarn
JPS59100738A (en) Production of polyester slub yarn
US3681821A (en) Method and apparatus for dephasing and entangling crimp yarn
GB1404669A (en) False twisting apparatus for producing crimps in filament yarns
US3431609A (en) Apparatus for processing yarn
US3899808A (en) Apparatus for uncurling selvedge
US3478945A (en) Yarn supplying means for knitting machines
US2802564A (en) Strand store device
US3802175A (en) Apparatus and process for producing twist in textile yarns
GB901922A (en) An apparatus and a method for heating or cooling and falsetwisting of running threads or yarns