FR2552785A1 - PADDING YARN COMPRISING ARTIFICIAL AND SYNTHETIC FIBERS FOR FILING AND PROCESS FOR PRODUCING THE SAME - Google Patents

Abstract

A.FIL PACKAGES CONTAINING ARTIFICIAL AND SYNTHETIC FIBERS TO BE SPINNED AND PROCESS FOR ITS MANUFACTURING. B. THREAD CHARACTERIZED IN THAT AT LEAST ONE OF THE RIBBONS 2, 2 IS SURROUNDED INDEPENDENTLY BY A FEW TURNS 3, 3 OF THE SECTIONS CLOSER TO HIM OF THE FIBERS 4, 4 WIDES OF THIS RIBBON ON WHICH THEY ARE FIXED, THE TWO RIBBONS 2, 2 TWISTED BEING WOUND TOGETHER WITH THE LAST TURNS 5, 5 OF THE REMAINING SECTIONS OF THE DEVIED FIBERS 4, 4. C. THE INVENTION RELATES TO A PACKED YARN CONTAINING ARTIFICIAL AND SYNTHETIC FIBERS TO BE SPINNED AND A PROCESS FOR ITS MANUFACTURING.

Description

Packaged yarn comprising artificial and synthetic fibers for spinning

  The invention relates to a packaged yarn comprising synthetic fibers for spinning, which contains small ribbons of synthetic spinning fibers twisted by the spinning rotation and twisted together, optionally combined with a bundle of continuous yarns. object of the invention is a method for the manufacture of a

such wire bundled.

  A characteristic of a bundled wire is that it has a slightly twisted core, which is enclosed by enveloping fibers. To make a bundled wire, it is necessary that, on the surface of the core, in the area where it is strongly twisted by In a false twist, there are other fibers or their parts, which are essentially slightly twisted, or which are wound on the core in the opposite direction. These fibers or their parts

  can be briefly referred to as "free ends".

  When canceling the false twist of the core, which is also accompanied by an increase in the length of the core, the free ends will be strongly tightened by winding on the core so that they tighten and

  consolidate, the nucleus being at the same time undulating.

  The formation of a bundled wire requires the following operations which differ in the manner of

  proceed to form a single twisted yarn.

  A false twist core is communicated to a core made of a small fiber ribbon, the ends of the free fibers being separated, these free and separate ends are kinematically connected to the surface of the core which will be twisted by the false twist, after which the free ends will roll, due to the cancellation of the false twist communicated to the core, and

will be tight around the nucleus.

  The free ends may be formed by feeding insulated fibers from an independent fiber ribbon to the surface of the twisted core. According to another process principle, the free ends are formed by fiber sections which, by their remaining portion, are fixed in the kernel that will be twisted In this case, the process for the formation of free ends can be further decomposed, and this by releasing sections of fibers from the surface of the fiber tape

  To twist and apply a method where it is impossible for the released fiber sections to be caught in the twisting of the fiber ribbon.

  The type of formation of the free ends also depends on the concrete structure of the bundled wire, its advantages and its deficiencies The type of formation of the free ends will also be influenced to a large extent by the mechanical installations used.

  and their operating properties.

  In cases where the free ends are formed by whole fibers, independent of the small fiber ribbon that will be twisted, the typical structure of the bundled wire which is formed in this way can be characterized as a yarn with a loosely twisted core, wound in enveloping fibers, these fibers being laid over their entire length on the surface of the twisted core This structure is very sensitive to abrasion, and in the practical embodiment of this manufacturing method for a wire of this kind, the capture of fibers enveloping on the small ribbon is very irregular, so that there is a noticeable irregularity in the resistance

some thread.

  In the case where the free ends are formed by parts of certain fibers whose remaining parts are anchored in the core, the structure of the bundled wire based on this type of production can be characterized as a loosely twisted core surrounded by ends. of 10 free fibers, the remaining parts of the fibers being a

  constituent part of the core of the wire.

  Compared to the previous case, the wire structure is less sensitive to abrasion, and

  There is also the possibility of achieving, according to the manufacturing conditions, a substantially better regularity of the yarn produced.

  According to one of the known methods, the free ends are formed by free ends of fibers of the

  a small ribbon of twisting fibers, this small ribbon necessarily having a lower density of false twists.

  A fundamental feature of this process is a density of a marked difference, double, false twists in the section between the torsion triangle and the maximum density section of the false twists. In the section closest to the torsion triangle, the The density of the twists in the small ribbon of twisted fibers is significantly lower and this gives the possibility for the free ends of the fibers to free themselves from the small ribbon of fibers to be twisted after the mentioned torsion triangle. The decrease of the twisting density of the small ribbon to be twisted after the torsion triangle can be achieved by means of a mechanical brake or a stop of the twists which prevents a recoil of the twists towards the torsion triangle, or mounting, before the false-twist communicating member, still a second twister which communicates with the small twisted fiber ribbon, for example, a twist in the opposite direction to that of the first wringer and which

  acts with a lower intensity.

  Under actual conditions of operation, the small fiber ribbon that is provided has fairly changeable properties. The number of fibers on the cross section per unit length, their arrangement, as well as their physicochemical properties.

change.

  To these changes would necessarily react, by appropriate compensation, a system communicating and limiting the density of the twists, so that the density of the core of the wire remains invariable over its length

and in time.

  With regard to the series arrangement of the false twist member and the torsion limiting member, as described above, it is only very difficult to maintain the operating stability since it is imposed Extremely stringent requirements for the adjustment of these elements I here is that an excessive reduction in the number of twists in the section where the density of the twists is limited, and which, in this case is the only one which is suitable the release of free ends, has the effect of lowering the resistance of this section and agumenter the number of interruptions of the operation Conversely, an augeration di, number of the torsions, in this section, makes more difficult the release of the free ends , and consequently leads to a

  significant lowering of the quality of the yarn as a finished product.

  The disadvantages of the yarns produced by the processes described in particular their irregularity and their low resistance, will be eliminated by the bundled yarn according to the invention, which comprises at least two small ribbons of fibers twisted by the twisting spinning and twisted together then forming the core of the yarn, each of the small fiber ribbons being surrounded independently by a few turns of short fibers adjacent sections which are fixed in the fiber ribbons concerned and which have been deviated, after which the two ribbons of twisted fibers are surrounded together by the remaining sections of the deflected fibers of the two small fiber ribbons. The yarn according to the invention is characterized by good abrasion resistance, regular core density and resistance along the length. The stability of the spinning operation represents a very important condition which is not validly maintained in the process described. The elimination of this drawback is ensured by a method for the manufacture of a bundled yarn, according to the invention, of which the design consists in the fact that the artificial fibers to be spun, diverted from a flat fiber ribbon, on a drawing bench, are deviated laterally, under the effect of external forces, on the side of the longitudinal direction of the movement of the ribbon twisting fibers; in this way, while the operation of transmitting a twist to the small twisted fiber ribbon takes place, the sections of the diverted fibers closest to it are wound in successive turns to the point of twisting, from which the remaining sections of the deflected staple fibers of at least one of the fiber ribbons are wound on the two twisting and twisting fiber structures, after which, after passing the yarn structure formed thereby in a zone where a twisting is imparted, and during the cancellation of the false spinning twisting and twisting twist, the different windings of deviated short fibers are fixed firmly, simultaneously, on the one hand on the fiber ribbons in the other. inside the yarn structre and secondly on this structure of

wire as a whole.

  In addition to the stability of the spinning operation, the method of the invention for the production of bundled wire, also brings a decrease in the requirements for the mechanical equipment, the compressed air consumption to communicate the false twist will be weaker, and there is no disagreement and need for further adjustment of the different building elements which have no reciprocal influence on each other.

others.

  Other advantages and effects will become apparent from the following description of the method for producing the yarn and yarn structure according to the invention with reference to the accompanying drawings, in which: FIG. 1 is a diagrammatic representation of two ribbons of fibers to be twisted and

  twisting, with indication of the zone of release of the free ends of fibers and the zone where these released free ends are deflected on the side of the longitudinal displacement of the fibers to twist and twisting;

  FIG. 2 is an elevational view of a packaged wire, showing the course of a turn of a piece of fiber released from a ribbon and deviated from this ribbon.

  The bundled yarn 1 according to the invention consists of at least two small ribbons of fibers 2, 2 ', twisted and twisted by the spinning rotation, which form the core of the bundled yarn 1 Each of the ribbons 30 of fibers 2, 2 ', twisted by spinning twist is twisted independently of a few turns 3, 3' of

fibers 4, 4 'deviated.

  The remaining sections of the fibers 4, 4 'd 6 viées are wound as last turns 5, 5' on the two tapes 2, 2 'twisted and twisted.

  Packaged yarn 1 can also be set in such a way that for example a single ribbon 2 is wound by a few independent turns 3, and this by the fibers 4 which have been deflected, while the second ribbon 2 'is not wound, while after twisting the two ribbons 2, 2 ', these two ribbons 2, 2' are then wound with the remaining sections of these fibers 4 deviated

from the ribbon 2.

  The bundled yarn 1 according to the invention 10 may also be modified so that it is constituted by the ribbon 2 of deflected fibers which is wound by a few turns 3 of the sections closest to the

  fibers 4 fixed in this band and which have been deviated.

  In addition, this packaged wire 1 contains a bundle of filaments which is twisted with the twisted fiber ribbon 2 mentioned, after which the two bundle structures are deflected together with the remaining sections of the bundles.

  fibers 4 deviated from the ribbon 2 twisted.

  The process for the production of packaged yarn 1 with a structure according to FIG. 2 is carried out as follows: From a fiber ribbon magazine which is not shown, a ribbon of fibers is sent to a bench drawing, where it is subjected to considerable stretching. The fiber ribbon is strongly thinned and a small flattened ribbon is formed. During the stretching operation of the fiber ribbon, the fiber ribbon is split into at least two ribbons.

flattened 6, 6 '.

  Before reaching the last nip 29 of the drawing bench, for example the nip of two pairs of driven rollers not shown, arranged next to each other, some fibers come off. at least one flattened ribbon 6,

  fibers that will be deviated from the main direction of the passage of this flattened strip.

  The deviation is effected, for example, under the effect of the natural ventilation of the pair of driven rollers of the drawbench mentioned, or under the effect of other external forces, such as for example by means of an electrostatic field, a depression, a blowing or a mechanical effect etc. The deflected fibers 4, or 4 'formed in this way, remain fixed by their rear ends in the main fiber bundle of the flat ribbons 10 6 , 6 'The free ends before the fibers 4, 4' deviated remain fixed to the flat ribbons 6, 6 'with their ends

  back in the main beam of fibers.

  The free ends before the fibers remain 4, 4 'are maintained in the other method of producing the bundled wire 1 under the action of external forces of the twisted ribbons. The deflected fibers 4, 4' will be deflected from the twisted ribbons 2, 2 '. , for example on an acute angle, the angle of their deviation being chosen

  according to the rigidity of the fibers cut from the ribbon of artificial or synthetic fibers to be spun.

  The deflected fibers 4, 4 'then wind under this angle of deflection chosen, also on

  ribbons 2, 2 'twisted, as will be discussed later.

  After the deflection of some of the fibers 4, 4 'of the ribbons 6, 6', the forming operation of the packaged wire 1 continues with the twisting of the two ribbons 6, 6 'The ribbons 6, 6' are transformed here twisted ribbons 2, 2 ', which will be twisted in the

  known conditions valid for the torsion triangle.

  The individual sections which move forward individually of the fiber ribbons 2, 2 'which are to be twisted, and the different fibers contained therein, twist on their longitudinal axis with a determined angular velocity and essentially receive a twist of During this twisting, the twisted ribbons 2, 2 'begin to wind on themselves the fibers 4, 4' deviated at an acute angle and this, on their sections which are the closest together, that is to say at from the place of their fixation on the twisted tapes 2, 2 'The winding of the deflected fibers 4, 4' will be further assisted because these deflected fibers 4, 4 'are still under the action of external forces, which tend these deflected fibers 4, 4 'and deviate them on the side This winding of the deflected fibers 4, 4' on the various twisted ribbons 2, 2 'is produced to the point of twisting of the two ribbons 2, 2' From of this twisting point, the two ru bans 2, 2 'which must be twisted wind on themselves a few last

  turns 5, 5 'of the residual free sections of the deflected fibers 4, 4'.

  The bundled wire 1 which has formed in this way passes into a torsion communication zone 8, where a member known for false twist formation acts pneumatically or mechanically on the wire 1 After this torsion communication zone 8 the cancellation of the false spinning twist of the wire 1 which had been communicated to the different ribbons 2, 2 'the twisting which had been communicated to the two ribbons 2, 2'

also being canceled.

  Then, however, the different windings 3, 3 'begin to tighten on the different ribbons 2, 2' twisted Similarly the windings 5, 5 'which surround the two ribbons 2, 2' twisted and twisted, begin to stretch during cancellation of the false twisting.

As a result, the core of the packaged yarn 1 is consolidated and tightens.

Claims (7)

Packaged thread comprising artificial and synthetic spinning fibers which contains at least two fiber structures twisted by a twisting twist and twisted together, in particular fiber ribbons which then form the core of the yarn, characterized in that at least one of the ribbons (2, 2 ') is surrounded, independently of a few turns (3, 3') of the sections closest thereto, of the fibers (4, 4 ') deviated from this ribbon on which they are attached, the two twisted ribbons (2, 2 ') being wound together with the last turns (5, 5') of the remaining sections of the deflected fibers (4, 4 ').   2) Packaged yarn according to claim 1, characterized in that a single ribbon (2 or 2 ') is wound a few turns (3 or 3') of the inner sections of the fibers (4 or 4 ') deviated from the ribbons ( 2 or 2 ') the two twisted ribbons (2, 2') being wrapped with the last turns (5, 5 ') of the remaining sections of the deflected fibers of the ribbon (2 or 2') comprising the fibers (4 or 4 ') ) deviated. 3) The packaged yarn according to claim 1, characterized in that the inner spinning fibers in the twisted ribbons (2, 2 ') have zero twist, or only twist, remaining internal.   4 0) Packaged wire according to claims 1 or 2, characterized in that it consists of a   fiber ribbon (2 or 2 ') which is surrounded by a few turns (3 or 3') of sections, which are the closest to it of fibers (4 or 4 ') attached to it and which have been deviated from it and a bundle of continuous yarns, which is twisted with the ribbon (2 or 2 '), the bundle formed by the two structures being surrounded, in common, with the last 35 turns (5 or 5') of the remaining sections of the fibers   (4 or 4 ') deviated from the ribbon (2 or 2').    A process for the production of packaged yarn according to claim 1, obtained after drawing a ribbon of synthetic fibers to be spun on a drawbench comprising drawing rollers, in front of the last nip of which a few fibers to The ribbon which is to be stretched flat, deviates from the main direction of the passage of this ribbon which later will be twisted into a twisting twist by means of a device imparting a false twist and which will be twisted with the other. fiber structure formed by a flat ribbon of spinning fibers, or a bundle of parallel filaments, characterized in that the fibers which have moved away from the flat ribbon of fibers on the drawbench 15 are deflected, under the effect external forces, the longitudinal direction of movement of the ribbon of fibers to twist while, while the twisting takes place, are wound on the ribbon of fibers that must be twisted the sections closest to the spun fibers 20 deflected in successive turns to the twisting point, from which the remaining sections of the deflected spun fibers, of at least one fiber ribbon, are wound on the two yarn structures which are to be twisted and bent, after which, after passing the yarn structure formed in this manner in a torsion forming zone and during the cancellation of the false twisting twist and twisting twist, the different windings of fibers deviated from spinning are simultaneously clamped on the one hand on the fiber ribbons 30 inside the wire structure and on the other hand, on the thread as a whole.   6) Process according to claim 5, characterized in that during the stretching operation of the fiber ribbon, it is split on the etching bench, at least two small ribbons, each of these small ribbons continuing to be stretched and undergoing the action of external forces that divert from him some fibers to spin laterally with respect to the main direction   passing fibers to spin into ribbons.   7) Method according to one of claims 5 and 6, characterized in that it acts on the fibers   deviated from spinning ribbon, in the section before twisting and during twisting of the ribbons by moving them apart and using the action of an air stream, an electrostatic field and possibly a liquid stream 8) Process according to Claim 5, characterized in that the deflection angle of the fibers to be spun separated from the ribbons of the longitudinal direction   The displacement of the ribbon is chosen according to the rigidity of the cut fibers.   9) Method according to one of claims 5 and 8, characterized in that the deflected ends of the fibers to spin are wound on an acute angle when   their winding on the ribbons to twist and twist.   10) A method according to claim 5, characterized in that the deviated spinning fibers are wound on the ribbons to twist in a direction opposite to the sense   of rising twists of twisted ribbons.   11) A method according to claim 5, characterized in that the number of deflected ends of fibers to be spun is selected according to the desired fineness of the thread to be pulled.