EP0241336A1 - Verfahren und Vorrichtung zur Veränderung eines durch Offenend-Spinnen hergestellten Garns - Google Patents

Verfahren und Vorrichtung zur Veränderung eines durch Offenend-Spinnen hergestellten Garns Download PDF

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Publication number
EP0241336A1
EP0241336A1 EP87400609A EP87400609A EP0241336A1 EP 0241336 A1 EP0241336 A1 EP 0241336A1 EP 87400609 A EP87400609 A EP 87400609A EP 87400609 A EP87400609 A EP 87400609A EP 0241336 A1 EP0241336 A1 EP 0241336A1
Authority
EP
European Patent Office
Prior art keywords
yarn
fibers
rod
twist
untwisting
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.)
Withdrawn
Application number
EP87400609A
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English (en)
French (fr)
Inventor
Jean-Claude Sorez
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.)
Prouvost SA
Original Assignee
Prouvost SA
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 Prouvost SA filed Critical Prouvost SA
Publication of EP0241336A1 publication Critical patent/EP0241336A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H7/00—Spinning or twisting arrangements
    • D01H7/92—Spinning or twisting arrangements for imparting transient twist, i.e. false twist
    • D01H7/923—Spinning or twisting arrangements for imparting transient twist, i.e. false twist by means of rotating devices
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • 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
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/14—Rendering uniform or evening non-uniform features
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch

Definitions

  • the present invention relates to the transformation of a textile fiber yarn into continuous scrolling, said yarn having been produced by spinning known as free fibers.
  • the purpose of the transformation contemplated by the invention is to give the yarn a presentation of the fibers and characteristics closer to those of the yarns obtained by ring spinning.
  • Spinning with free fibers has significant technical advantages over ring and slider spinning: greater drawing capacity, higher production speed, possibility of increasing the weight of the spools and automating their lifting.
  • the yarns produced by the spinning with released fibers have a less satisfactory appearance and dynamometric resistance, taking into account a less good parallelization of the fibers constituting said yarns, in comparison with the yarns produced by ring spinning.
  • This lack of parallelization particularly affects the fibers located on the periphery of the yarn, which can sometimes wind up one or more turns around the yarn during the formation of the latter, giving rise to an irregularity in appearance and bulking known as the bundle name.
  • the same portion of the spun yarn is subjected to three combined and simultaneous actions, the first of partial and momentary untwisting sufficient to allow the fibers to slide over one another, the second of stretching reduced according to a rate between 1.10 and 1.25 and the third control fibers during their sliding.
  • the purpose of partial untwisting is to reduce the cohesion of the open-end yarn to allow the fibers to slide over each other under the action of stretching.
  • Stretching under control and at a limited rate has the effect of stretching the fibers, of sliding them slightly in a controlled manner with respect to each other and of parallelizing them.
  • the untwisting is only momentary so that the yarn thus reorganized finds a twist which gives it sufficient cohesion to ensure its continuous scrolling.
  • the resumption of torsion occurs while the fibers are individually parallelized and under tension thanks to the controlled stretching.
  • This presentation of the fibers is entirely comparable to that occurring during the constitution of the yarn in the ring spinning: at the exit of the drawing train the fibers are parallel and under tension when torsion is applied to them.
  • the fibers were deposited in the throat of the rotor without parallelization and they are put under torsion without a tension being applied to them.
  • This difference in presentation of the fibers explains the best dynamometric characteristics of the yarns obtained by ring spinning.
  • the yarn obtained has characteristics close to that of a yarn obtained by ring spinning.
  • the invention also relates to a device specially designed for the implementation of the above method.
  • This device comprises on the route of an open-end yarn, in continuous movement, and acting on the same portion of said yarn, a means ensuring both the partial and momentary untwisting and the control of the fibers during their sliding one by compared to the others, and means carrying out the stretching at a rate between 1.10 and 1.25.
  • the stretching means consist of two appeal members, the second member in the direction of travel of the yarn having a call speed slightly higher than that of the first member, and the untwisting and control means consist in a false twist device, acting in the opposite direction to the initial twist of the yarn, placed on the path of the yarn between the two calling members, having a surface ensuring close contact with the yarn as soon as it leaves the first yarn member call.
  • the appeal members are of a known type, for example each member consists of a pair of cylinders, the axes of rotation of which are parallel, applied one against the other, rotating in opposite directions one of the other, and having the same peripheral speed.
  • the first appeal body can be an integral part of a pre-existing installation; this may in particular be the case when the device according to the invention is placed at the outlet of a spinning machine freed fibers: the first call member according to the invention may consist of the system for delivering the yarn leaving the torsion member.
  • the false torsion device with a large contact surface consists of a twisted rod on itself in a helix along its longitudinal axis, and movable in rotation around said longitudinal axis.
  • a device which is similar to a helically twisted rod, placed on the fiber path during a drawing operation but this known device is fixed and is put in works in the classic spinning circuit. It replaces the usual devices for controlling fibers during drawing, such as sleeves.
  • the fiber yarn is wound in a helix around the twisted rod.
  • the friction between the surface of the rod and the periphery of the yarn causes said yarn to rotate on itself, and therefore produces its untwisting.
  • the rotation of the yarn on itself will be all the more important as the coefficient of friction of the surface of the rod in contact with the yarn will itself be high. It is this same surface which ensures, due to the close contact with the yarn, the control of the slip of the fibers.
  • the twisted rod has at its downstream part a baffle through which passes the yarn.
  • This baffle is intended to ensure the rotation of the yarn on itself, whatever the coefficient of friction of the surface of the rod.
  • the twisted rod is movable in rotation.
  • the rod is for example housed inside and secured to a cylindrical tube, itself driven in rotation about its longitudinal axis.
  • the open-end yarn 1 comes from a power source not shown and passes between two cylinders 2 and 2 ⁇ , driven in rotation, which drive the yarn 1 at a speed of movement V1 in the direction of the arrow F.
  • the yarn 1 is wound around the twisted rod 3, passes through the baffle 4 located on the downstream part of the rod 3, then between the two cylinders 5 and 5 ⁇ , driven in rotation, which drive the yarn 1 at a speed of displacement V2 in the direction of arrow F.
  • the twisted rod 3 is housed inside and is integral with the cylindrical tube 6, which is rotated by means not shown, for example a belt applying to the outer surface of the tube 6.
  • the rotation of the tube 6 is in the opposite direction to the twist possessed by the yarn 1.
  • the speed V2 is slightly higher than the speed V1.
  • Yarn 1 for example a cotton yarn obtained on a loose fiber spinning machine, has a metric number 30 and a twist Z of 710 turns per meter.
  • Its coefficient of torsion ⁇ which, by definition, is equal to the ratio of torsion to the square root of the metric number is, in this case, 130; this high value is quite usual for yarns obtained by this type of spinning.
  • the cylinders 5 and 5 ⁇ deliver the wire 1 at a speed of 50 meters per minute.
  • Tube 6 rotates at the rate of 25,000 revolutions per minute in the opposite direction to the twist of the wire, i.e. in the direction of arrow C ( Figure 3).
  • the cylinders 5 and 5 ⁇ deliver the wire 1 at a speed of 60 meters per minute (20% stretching).
  • This untwisting per meter of yarn is at most equal to the quotient of the speed of rotation of the rod by the speed of movement of the yarn, ie in the aforementioned example of 500 turns per meter.
  • the yarn 1 has upstream of the baffle 4 a twist of the order of 210 turns per meter.
  • the fibers constituting the yarn 1 can slide relative to each other under the action of the low rate drawing applied between the pinching line of the cylinders 2 and 2 ⁇ and the downstream end of the baffle 4 output of the false twist spindle 3, beyond which the yarn 1 has covered all the initial twist but distributed over a greater length taking into account the stretching; in the example cited the twist of yarn 1a is 592 turns / meter.
  • the yarn 1 is in close contact with the surface of the twisted rod 3 which, by its helical shape, envelops the yarn 1 and brings the fibers together when they slide relative to one another .
  • This action of controlling the slip of the fibers exerted by the part of the rod 3 located upstream of the baffle 4 is particularly regular and effective when the stretching zone, that is to say the portion of the yarn comprised between the line pinching the cylinders 2 and 2 ⁇ and the outlet of the baffle 4 is slightly less than the maximum length of the fibers making up the yarn 1.
  • the distance between the pinching line of the cylinders 2 and 2 ⁇ and the downstream end of the false twist spindle 3 is preferably chosen to be greater than 0.8 times the maximum length of the fibers of the yarn 1 to be transformed.
  • the controlled stretching thus produced in the portion of the yarn with reduced torsion has the effect of stretching, straightening and parallelizing the fibers.
  • Yarn 1 finds a significant twist after the false twist spindle, that is after baffle 4 and before cylinders 5 and 5 ⁇ : thus yarn 1 is reformed after its fibers have been straightened and parallelized.
  • the yarn 1a leaving the false twist spindle 3 has certainly found a significant twist which provides it with sufficient cohesion to be towed and removed from the device, but having undergone stretching the twist coefficient of the yarn 1a is affected.
  • the new twist coefficient of the yarn 1a after transformation according to the method of the invention will be 98.6.
  • the yarns obtained by spinning with free fibers have a coefficient of twist often much higher than those of the yarns of the ring spinning, this value is of the same order as that of the yarns of the ring spinning. If in the above example, the draw ratio had been 1.1, the twist coefficient of the yarn produced would have been 112.4. It is up to the skilled person to adjust the stretching rate applied as a function of the use of the yarn, which conditions the desirable value of the coefficient of torsion.
  • the value ⁇ 2 of the twist coefficient of yarn 1a, after transformation is obtained by the following formula: where ⁇ 1 is the value of the twist coefficient of yarn 1 before transformation and K the applied stretching rate (V2 / V1).
  • the twisted rod 3 has a circular (fig. 1) or substantially rectangular (fig. 4a) or slightly oval (fig. 4b) or bilobed (fig. 4c) section. It is made of a material sufficiently resistant to abrasion. Its surface is smooth to avoid entanglement of the fibers. In the case of a rod 3 with circular section (fig. 1) or substantially rectangular (fig. 4a) or slightly oval (fig. 4b) or bilobed (fig. 4c) section. It is made of a material sufficiently resistant to abrasion. Its surface is smooth to avoid entanglement of the fibers. In the case of a rod 3 with circular section (fig.
  • Figures 3a to 3h show the relative positions of the yarn 1 and a twisted rod with a substantially rectangular section, inside the cylindrical tube 6.
  • the rod 3 is twisted on itself along its longitudinal axis in the form of propeller whose pitch is equal to the distance separating the planes AA ⁇ and EE ⁇
  • the partial and momentary untwisting would consist in giving the yarn a twist (500 turns / meter) opposite to that which it had initially (710 turns / meter).
  • the partial untwisting therefore the application of the reverse twist must be sufficient to allow the fibers to slide relative to one another under the combined drawing action.
  • the value of the inverse torsion is not limited to that of the initial torsion; in fact it may in certain cases be advantageous to untwist the yarn beyond its initial twist and therefore to temporarily provide it with a twist which will be in the opposite direction to that of the initial twist. This will in particular be the case for the transformation of yarns which comprise fibers at the periphery which are over-twisted with respect to the average twist of the yarn.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
EP87400609A 1986-03-19 1987-03-19 Verfahren und Vorrichtung zur Veränderung eines durch Offenend-Spinnen hergestellten Garns Withdrawn EP0241336A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8604210 1986-03-19
FR8604210A FR2596073B1 (fr) 1986-03-19 1986-03-19 Procede et dispositif de transformation d'un file de fibres textiles

Publications (1)

Publication Number Publication Date
EP0241336A1 true EP0241336A1 (de) 1987-10-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400609A Withdrawn EP0241336A1 (de) 1986-03-19 1987-03-19 Verfahren und Vorrichtung zur Veränderung eines durch Offenend-Spinnen hergestellten Garns

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EP (1) EP0241336A1 (de)
FR (1) FR2596073B1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191310327A (en) * 1913-05-02 1914-04-30 Ernest Richard Royston Improvements in or connected with Spinning Wool, Cotton, and other Fibres, or Fibrous Material.
US1744619A (en) * 1928-11-28 1930-01-21 Courcy John E De Twister
DE618420C (de) * 1933-02-22 1935-09-07 Fritz Meyer Streckwerk fuer Spinnereimaschinen
GB519995A (en) * 1938-10-10 1940-04-11 William Pool Improvements in or relating to twist tubes for textile yarns and like materials
CH259088A (de) * 1945-04-13 1949-01-15 Casablancas High Draft Co Ltd Falschdrahtröhrchen.
DE1112928B (de) * 1957-09-10 1961-08-17 Ludwig Althof Verfahren und Vorrichtung zum Spinnen von Garn aus stapeligen Fasern, insbesondere von Streichgarn, bei gleichzeitigem Verzug
FR2024634A1 (de) * 1968-11-30 1970-08-28 Japan Textile Wool Cy Lt

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS183469B1 (en) * 1976-07-08 1978-06-30 Ludvik Fajt Method of and apparatus for conveying fibrous material in open-end rotor spinning machines

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191310327A (en) * 1913-05-02 1914-04-30 Ernest Richard Royston Improvements in or connected with Spinning Wool, Cotton, and other Fibres, or Fibrous Material.
US1744619A (en) * 1928-11-28 1930-01-21 Courcy John E De Twister
DE618420C (de) * 1933-02-22 1935-09-07 Fritz Meyer Streckwerk fuer Spinnereimaschinen
GB519995A (en) * 1938-10-10 1940-04-11 William Pool Improvements in or relating to twist tubes for textile yarns and like materials
CH259088A (de) * 1945-04-13 1949-01-15 Casablancas High Draft Co Ltd Falschdrahtröhrchen.
DE1112928B (de) * 1957-09-10 1961-08-17 Ludwig Althof Verfahren und Vorrichtung zum Spinnen von Garn aus stapeligen Fasern, insbesondere von Streichgarn, bei gleichzeitigem Verzug
FR2024634A1 (de) * 1968-11-30 1970-08-28 Japan Textile Wool Cy Lt

Also Published As

Publication number Publication date
FR2596073A1 (fr) 1987-09-25
FR2596073B1 (fr) 1988-11-04

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