US3611692A - False twist crimping apparatus - Google Patents

False twist crimping apparatus Download PDF

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Publication number
US3611692A
US3611692A US843142A US3611692DA US3611692A US 3611692 A US3611692 A US 3611692A US 843142 A US843142 A US 843142A US 3611692D A US3611692D A US 3611692DA US 3611692 A US3611692 A US 3611692A
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United States
Prior art keywords
yarn
heating
false twist
yarns
travel
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Expired - Lifetime
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US843142A
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English (en)
Inventor
Hermann Kubler
Heinz Treptow
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.)
Oerlikon Barmag AG
Original Assignee
Barmag Barmer Maschinenfabrik AG
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Filing date
Publication date
Priority claimed from DE19681785466 external-priority patent/DE1785466B2/de
Priority claimed from DE19681817617 external-priority patent/DE1817617A1/de
Application filed by Barmag Barmer Maschinenfabrik AG filed Critical Barmag Barmer Maschinenfabrik AG
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Publication of US3611692A publication Critical patent/US3611692A/en
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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
    • D02G1/0266—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 false-twisting machines

Definitions

  • False twist crimping device for yarns, including filamentary materials such as those made of artificial fibers, comprising false twist units, first and second yarn-heating devices preceding and following each unit, winding devices disposed after the false twist units and adjacent the second heating device with optional second heating device by-pass, and yarn delivery means arranged laterally adjacent to or on the machine.
  • the heating device used before the false twister has preferably been an electrical resistance heater over which the yarn travels in contact with a preferably convexly curved heating face.
  • Such heating devices have found wide acceptance and the same devices have now also been employed for postfixing after the false twister, for continuous production of set yarn.
  • False twist units have recently been improved to such an extent that, in practice, they may quite readily be run at velocities of 500,000 r.p.m., thus permitting a considerable acceleration of the throughtravel in the yarn structures to be crimped. This has necessarily resulted in lengthening of the hitherto conventional heating zones before and after the false twister, so as to ensure the necessary degree of heating.
  • Such yarn twisting machines having a large number of closely juxtaposed processing sections have a considerable overall height, if yarn guiding is to be clear and neat. For this reason, they may be operated only with difficulty especially before and during starting up of the machine. For this reason, it has already been proposed to arrange the heating zones side by side, or to arrange them one behind the other before and after the false twister, at the same height (of, US. Pat. No. 3,077,724), or to replace them by a single common heating device over which the yarn travels downwardly once before the false twist unit, and over which it passed, in the opposite direction, after the false twist unit.
  • a device for this purpose should be capable of being used selectively for the manufacture of highly elastic or relatively inelastic crimped yarns.
  • such a device should be clearly and neatly arranged, and simple to oper-- ate especially in comparison with known devices of the type described above.
  • the invention provides a false twist crimping device for synthetic yarns, the device comprising a first heating device; a false twist unit arranged after the first heating device in the path of yarn travel; yarn delivery means arranged after the false twist unit; a second heating device arranged after the yarn delivery means, adapted to heat the yarn substantially only by convection, and having enclosing walls defining an internal chamber; a multiplicity of yarn inlets in an end wall of the second heating device; a multiplicity of yarn outlets provided in an opposite end wall of the second heating device; and means for guiding a multiplicity of crimped yarns simultaneously through the internal chamber without contacting one another and in spaced relationship to the side walls of the second heating device.
  • a multiplicity is to be understood in the context of the present invention to mean a number considerably greater than two.
  • the filaments from fifteen or more juxtaposed false twist units can be guided through a single yarn-heating chamber. It is also possible to bring together the filaments of two oppositely arranged rows consisting respectively of fifteen or more false twist units in each case and to guide them, while keeping an adequately large spacing between them so as to avoid mutual contact, separately through a single heating chamber.
  • the heating device connected before the false twist unit is an electrical resistance heater through or over which the filaments can travel, individually or in groups, and which preferably has either a varying cross section or a varying heating output along the filament travel path.
  • the first heating device is adapted to heat the yarn substantially only by convection and has enclosing walls defining an internal chamber, means for simultaneously guiding a multiplicity, as herein defined, of filaments, through the chamber, and a multiplicity of yarn inlet and outlet apertures.
  • heating substantially only by convection is, in the present context intended to indicate that the heat transfer between the walls and the yarns is effected not by contact, only to a negligibly small degree by radiation and mainly by convection, i.e., by means of a gaseous medium contained within the heating box.
  • the heating of the heating box may be effected directly or indirectly, for example by means of electrical resistance elements.
  • the ratio of the lengths of the heating zones before and after the false twist unit may vary within wide limits, depending on the temperatures employed, it has been found to be expedient, in the case of substantially uniform temperatures in the two heating sections, that the second heating zone through which the yarn travels after the false twist unit should be from 60% to 80% of the length of the first heating section preceding the false twist unit.
  • the introduction of the individual filaments into the yarn inlet or outlet apertures of the heating box may for example be effected by an arrangement whereby the heating box is hinged and is re-closed after introduction of the yarns.
  • this solution cannot be employed or can be employed only with the accompaniment of very considerable spatial difiiculties.
  • the yarn inlet and yarn outlet apertures in the horizontal walls of the heating box are in the form of funnels whose largest diameter is greater than the smallest diameter through which a threading weight secured to the filament would be able to pass without any great hindrance.
  • the weight is of spherical shape.
  • the two heating devices are adapted to be regulated and used independently of one another device, and a guide means is arranged above each of the winding-on devices to deflect the crimped yarns and by-pass the second heating device.
  • the second heating device is shut down and guide means are employed which make it possible to guide crimped yarn directly to the winding-on device.
  • the yarn-delivery, linear velocity imparted by the delivery mechanism arranged directly before the second heating device is preferably substantially equal to the linear winding-on velocity at which the crimped yarn is deposited on the winding-on device, and the yarn delivery velocity of the yarn delivery mechanism directly following the second heating device is substantially lower.
  • the crimped yarn is able to shrink unhindered during the thermal treatment in the second heating zone, and at the same time the volume of the package does not become excessively large.
  • the yarn wound under tension becomes bulky once again when it is dotted, i.e., it assumes that shape which it possessed on leaving the second heating device.
  • the yarn character required in each specific case may be predetermined in known manner.
  • the yarn delivery velocity of the delivery mechanism arranged directly before the second heating device is preferably higher than the winding-on velocity at which the crimped yarn is deposited on the winding-on device, whereas the yarn delivery velocity of the yarn delivery mechanism directly after the second heating device is lower than the linear winding-on velocity.
  • a travel-over device which is displaceably and/or pivotally arranged before the first heating device to provide vertical adjustment by means of a guided manipulating means and serving to position the filament or filaments travelling to it at overhead level from a yarn-supply creel or the like.
  • a baffle plate At the lower end of the second heating device there may be a baffle plate, adapted to be pivoted into the path of travel of the yarn, inclined at approximately 45 relative to the yarn travel direction and serving as a yarn introduction aid.
  • FIG. 1 is an elevational view of a false twist crimping machine having the two heating zones of which only the zone following the false twist unit is designed as a convection heating box or chamber;
  • FIG. 2 is an elevational view of a similar machine in which the heating zone preceding the false twist unit is also a convection heating box or chamber;
  • FIG. 3 is a front elevation of an electrical resistanceheated, yarn-heating plate of varying transverse cross section
  • FIG. 4 is a side elevation of the yarn-heating plate of FIG. 3;
  • FIG. is a front elevation of another embodiment of a yarn-heating plate of varying transverse cross section
  • FIG. 6 is a side elevation of still another embodiment of a yarn-heating plate of varying transverse cross section.
  • FIG. 7 is a perspective view of a tubular form yarnheating element.
  • FIG. 1 and FIG. 2 shows the yarn travel during the manufacture of a relatively inelastic yarn which passes through both heating zones, whereas the left-hand half shows the yarn travel with second heating zone by-pass during the manufacture of a highly elastic yarn.
  • Filaments 1 are doffed, from supply bobbins or cops 3 by endless band and drive roller delivery mechanisms 2, and pass over the so-called service passage above the level of the heads of machine operators.
  • the cops 3 are, in part, reserve cops. They may be doffed individually or simultaneously in groups and travel over a corresponding number of guide points and travel-over rollers 4 into a heating device 5.
  • Each travel-over roller 4 is rotatably mounted on a two-armed lever 6 connected by a pivot 7 to a vertically displaceable manipulating means 8.
  • the manipulating means 8 (shown shortened in broken lines) extends sufficiently far into the service passage for it to be readily and conveniently actuated by an operator.
  • the lower end of the manipulating means 8 is displaceably mounted in a stationary fixture 9.
  • the free arm of the lever 6 carries a small counterweight 10 which may be replaced by any means of storing potential energy. In the upper inoperative position of the manipulating means 8, the lever arm 6 bears against a stationary stop 11.
  • Each heating device 5 comprises a heating plate over which the filaments travel in direct contact therewith.
  • the heating plate is an electrical heating resistance element acting upon a multiplicity of filaments and has its width or thickness so profiled that its electrical resistance varies in a functionally suitable manner along the travel path of the yarn.
  • Such a plate is described in greater detail in our French specification No. 1,516,505 and in our aforesaid US. application, as well as below.
  • a contact-free operating heating device 14 which comprises a spacious, essentially closed heating box or chamber. The heat is transferred to the filaments substantially only by convection.
  • a baffle plate 15 and a delivery mechanism 16 corresponding to each of the false twist units are provided beneath the heating device 14. The endless band thereof and the bafile plate are adapted to be pivoted individually or in groups by means of a hand lever 17. From the delivery mechanism 16, the yarn 1 then travels to one of the winding-on devices 18.
  • the manipulating means 8 is put into its lower, arresting position to position a filament 1 after the filament 1 has been laid over the roller 4.
  • the manipulating means 8 is once again pushed into upper inoperative position.
  • the lever arm 6 contacts the stop 11, it rotates slightly about the point 7 in a counterclockwise direction.
  • the filament 1 comes into direct contact with the heating plate 5.
  • a perforated metal ball is secured to a free filament end and allowed to fall through the first yarn inlet passage 22 in the upper wall of the heating box 14.
  • the ball is glided by the funnel 22 through the yarn outlet passage in the lower wall and the heating box and strikes the baflle plate 15, which at this stage is in the position shown on the left-hand side of FIGS. 1 and 2.
  • the inclination of the baflie plate 15 relative to the yarn travel path has the effect that the metal ball, with the yarn end knotted thereto, falls forwardly into the service passage.
  • the baffle plate 15 is pivoted out of the yarn travel path into the position shown on the right-hand of FIGS. 1 and 2.
  • the crimping of the yarn 1 may be effected in a manner such as the following, for example. Twist travelling baok wards in the yarn 1 from the false twist unit 12 is fixed or set by the heating device 5. After twist has once again been imparted to the yarn below the false twist unit 12, the twisted yarn is guided from the delivery mechanism 13 into the yarn-contact-free heating device 14 in which post-setting, preferably accompanied by simultaneous ten sion relief, then takes place.
  • the post-setting eliminates torsion stresses set up in the yarn 1 due to the preceding twisting, so that the yarn reaching the bobbin of the winding-on device 18 is a so-called set or dead yarn.
  • FIGS. 3-6 illustrate embodiments of yarn-heating plates which may be used as the yarn-heating means 5 in FIG. 1.
  • Each of these embodiments comprises a longitudinally bowed heating element or plate of relatively high resistance, which elements are heated upon passage of electrical current therethrough.
  • the surface temperature along the entire length of the heating elements is made more uniform or may be varied within predetermined limits by variation of the transverse cross section of the heating elements.
  • the transverse cross section variations can be obtained by a change in width and/or thickness of the resistor element, or by machining, e.g., drilling holes at predetermined places in the heating plate.
  • FIGS. 3 and 4 show one embodiment of an electrical resistance heating plate or element 25 of varying transverse cross section.
  • the longitudinally curved heating plate or element is heated by an electric current which passes directly through the element. It is tapered to provide widths which gradually increase at the upper, flaring end 26 and which gradually decrease at the lower, tapered end 27.
  • Such changes in the width dimension of the heating element or plate 25 provide areas of highest electrical resistance at the opposite longitudinal ends thereof, which electrical resistance gradually dimensions toward the midportion 28.
  • This configuration of the heating plate or element 25 provides a substantially uniform surface temperature throughout the length thereof and compensates for inherent resistance-heating characteristics in the plate 25 and for uneven heat losses to the atmosphere via radiation and convection from the heating plate 25.
  • Change in cross section to vary the electrical resistance of the yarn-heating plate or element may also be provided by using a longitudinally bowed heating plate or element 30 as shown in FIG. 5.
  • the electrical resistance of this plate which has a uniform width and thickness, is achieved by drilling in the longitudinal edge portions thereof a plurality of holes 3 1 with progressively increas ing spacing between said holes in the upper portion 32 and by drilling additional holes 31a in the lower portion 33-.
  • the holes 31a are more closely spaced than the holes 3 1, and the spacing therebetween gradually dimensions in the downward direction.
  • This arrangement provides a substantially uniform temperature characteristic similar to that provided by the embodiment of FIGS. 3 and 4.
  • the change in transverse cross section is accomplished by changing the thickness dimension rather than the width dimension of the heating plate or element.
  • the heating element is composed of a longitudinally bowed plate 35, onto the underside of which is solidly joined in electrical conducting relationship a shorter heating plate 36. The latter in turn has solidly joined therewith in electrical conducting relationship a still shorter heating plate 37.
  • the yarn heating element of FIG. 7 is a longitudinally bowed, longitudinal split tube 40. Yarn is inserted and withdrawn therefrom through the longitudinal slot 41.
  • the variations in transverse cross section are obtained by drilling or punching holes 42 and 42a in the respective end portions in a manner similar to the apertured heating plate shown in FIG. 5.
  • the embodiment shown in FIG. 2 is similar to that shown in FIG. 1 except that the heating device before the false twist unit '12 is replaced by a heating device having yarn-contact-free convection heating means 20 and is designed in the same manner as a heating box 21 after the false twist unit.
  • False twist crimping apparatus for crimping synthetic yarns comprising first yarn-heating means; a false twist unit following said first heating means in the path of yarn travel; yarn delivery means following the false twist unit; second yarn-heating means following said yarn delivery means and adapted to heat the yarn substantially only by convection; said second yarn-heating means having enclosing wall defining a substantially closed, convection-heating chamber; a multiplicity of yarn inlet passages provided in an end wall of the second heating means; a multiplicity of yarn outlet passages provided in an opposite end wall of said second heating device; and means for drawing a multiplicity of yarns simultaneously through said chamber via said passages without contacting one another and in spaced relationship to the walls of the second heating means.
  • said first heating means is an electrical resistance heater element over which or through which the filaments travel individually or in groups in direct contact with a heated surface.
  • False twist crimping apparatus for crimping synthetic yarns comprising first yarn-heating means; a false twist unit following said first heating means in the path of yarn travel, said first heating means being an electrical resistance heater element over which or through which the filaments travel individually or in groups in direct contact with a heated surface, said heater element varying in transverse cross section along the yarn travel path across said surface; yarn delivery means following the false twist unit; second yarn-heating means following said yarn delivery means and adapted to heat the yarn substantially only by convection; said second yarn-heating means having enclosing walls defining a substantially closed, convection-heating chamber; a multiplicity of yarn inlet passages provided in an end wall of the second heating means; a multiplicity of yarn outlet passages provided in an opposite end wall of said second heating device; and means for drawing a multiplicity of yarns simultaneously through said chamber via said passages without contacting one another and in spaced relationship to the walls of the second heating means.
  • False twist crimping apparatus for crimping synthetic yarns comprising first yarn-heating means; a false twist unit following said first heating means in the path of yarn travel, said first heating means being an electrical resistance heater element over which or through which the filaments travel individually or in groups in direct contact with a heated surface, means to vary the heat output of said heating element in the direction of yarn travel across said surface; yarn delivery means following the false twist unit; second yarn-heating means following said yarn delivery means and adapted to heat the yarn substantially only by convection; said second yarn-heating means having enclosing walls defining a substantially closed, convection-heating chamber; a multiplicity of yarn inlet passages provided in an end wall of the second heating means; a multiplicity of yarn outlet passages provided in an opposite end wall of said second heating device; and means for drawing a multiplicity of yarns simultaneously through said chamber via said passages without contacting one another and in spaced relationship to the walls of the second heating means.
  • said first heating means is adapted to heat the yarn substantially only by convection and has enclosing walls defining a substantially closed, convection heating chamber having means for simultaneously guiding a multiplicity of yarns through said chamber, and a multiplicity of yarn inlet and outlet passages in opposed end walls of said chamber.
  • Apparatus as claimed in claim 1 and further additional yarn delivery means following said second heating means to deliver yarns which have passed through the second heating means.
  • Apparatus as claimed in claim 1 and further additional yarn delivery means following said second heating means to deliver yarns which have passed through the second heating means, and guide means arranged relative to the Winding means and said second heating means to guide yarns to a winding means in a path by-passing said second heating means.
  • Apparatus as claimed in claim 1 and further additional yarn delivery means following said second heating means to deliver yarns which have passed through the second heating means, and guide means arranged relative to the winding means and said second heating means to guide yarns to a winding means in a path by-passing said second heating means, said additional yarn delivery means being located to provide a length of yarn path between said additional yarn delivery means and its corresponding winding means substantially the same as the length of yarn path between said yarn delivery means following said false twist unit to its corresponding winding means.
  • Apparatus as claimed in claim 1 a yarn guide carried in a vertically adjustable manner by manipulating means before the first heating device and a bafile plate 10 arranged at the lower end of the second heating device, adapted to be pivoted into the yarn travel path and inclined at approximately 45 relative to the yarn travel direction so as to serve as a yarn positioning aid.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US843142A 1968-09-27 1969-07-18 False twist crimping apparatus Expired - Lifetime US3611692A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19681785466 DE1785466B2 (de) 1968-09-27 1968-09-27 Falschdrallkaeuselvorrichtung
DE19681817617 DE1817617A1 (de) 1968-12-31 1968-12-31 Falschdrallkraeuselvorrichtung

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US3611692A true US3611692A (en) 1971-10-12

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Application Number Title Priority Date Filing Date
US843142A Expired - Lifetime US3611692A (en) 1968-09-27 1969-07-18 False twist crimping apparatus

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US (1) US3611692A (enrdf_load_stackoverflow)
BE (1) BE733685A (enrdf_load_stackoverflow)
CH (1) CH492043A (enrdf_load_stackoverflow)
CS (1) CS167258B2 (enrdf_load_stackoverflow)
DK (1) DK129469B (enrdf_load_stackoverflow)
ES (1) ES367549A1 (enrdf_load_stackoverflow)
FR (1) FR2019071A1 (enrdf_load_stackoverflow)
GB (1) GB1234340A (enrdf_load_stackoverflow)
LU (1) LU59475A1 (enrdf_load_stackoverflow)
NL (1) NL6909560A (enrdf_load_stackoverflow)
SE (1) SE340670B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581883A (en) * 1983-11-21 1986-04-15 Barmag Barmer Maschinenfabrik Ag Yarn false twisting apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581883A (en) * 1983-11-21 1986-04-15 Barmag Barmer Maschinenfabrik Ag Yarn false twisting apparatus

Also Published As

Publication number Publication date
CS167258B2 (enrdf_load_stackoverflow) 1976-04-29
NL6909560A (enrdf_load_stackoverflow) 1970-04-01
DK129469B (da) 1974-10-14
SE340670B (enrdf_load_stackoverflow) 1971-11-29
DK129469C (enrdf_load_stackoverflow) 1975-03-03
GB1234340A (enrdf_load_stackoverflow) 1971-06-03
ES367549A1 (es) 1971-04-01
CH492043A (de) 1970-06-15
BE733685A (enrdf_load_stackoverflow) 1969-11-03
LU59475A1 (enrdf_load_stackoverflow) 1970-01-09
FR2019071A1 (enrdf_load_stackoverflow) 1970-06-26

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