FR2560229A1 - PROCESS FOR OBTAINING A FIBER FILE - Google Patents

Abstract

PROCESS FOR OBTAINING A FIBER THREAD. A WICK OF FIBERS 1 IS STRETCHED INSIDE A STRETCHING SYSTEM 2 PROPERLY, FOLLOWED BY A CONDENSER ELEMENT 6 IN THE FORM OF A MOBILE GUIDING SURFACE ON WHICH FIBERS 1 ARE TANGENTIALLY DELIVERED AND WHICH EXERCISES A TENSILE FORCE ON THE FREE END OF THE FIBERS. THE FORMED THREAD IS, BEFORE REWINDING, SUBJECT TO THE ACTION OF A FALSE TORSION 7 BY MEANS OF A CROSSED OR EQUIVALENT BELT SPINDLE. THIS PROCESS MAKES IT POSSIBLE TO OBTAIN A THREAD OF FIBERS DIRECTLY USED WITHOUT COMMUNICATING AN ADDITIONAL TORSION.

Description

PROCESS FOR OBTAINING A FIBER FILE

  The present invention relates to an improvement made to the process implemented on the device which is the subject of the French patent application No. 82/01 383 of January 26, 1982 in the name of the Applicant. This patent application discloses a device for stretching, condensing and transporting a wick of

  fibers during a spinning operation.

  In general, according to this document, a

  The condenser element is arranged as a result of the actual drawing system, said condenser element being in the form of a movable guide surface on which the fibers are delivered tangentially, this guide surface making it possible to exert a traction force. on the end of the fibers delivered by the drawing system and being disposed upstream of a system

  conventional spinning, for example with rings and

ers.

  According to one embodiment mentioned in this document

  The conventional spinning system may be a false twist spindle. Such a false twist spindle makes it possible to communicate to the yarn a certain cohesion which, in certain cases, makes it possible to obtain a yarn that can be used directly without having to go to it.

  communicate additional torsion.

  It has been found, and this is the subject of the present invention, that it was possible simply by selecting a pin of false twist determined, among all the pins known to date, to improve again

  the cohesion of the yarn formed in that the spindle used

  not only communicates a false twist in wire

  but also pulls on said wire.

  Of the appropriate false twist pins,

  suitable for carrying out the process according to the invention.

  cross-belt spindles, -2-

  pins well known technicians that it is therefore

to describe in detail.

  Of course, other types of pins simultaneously fulfilling the two functions mentioned above could be used. In general, the invention therefore relates to an improvement in the method for the implementation of the device which is the subject of the French patent application No. 82/01383, a process which consists, during a spinning operation allowing -to transform a wick

  of yarn fibers to stretch said wick by making it

  in the actual drawing system followed by a condenser element which is in the form of a movable guide surface on which the fibers are delivered tangentially and which tends to exert a tensile force on the free end of said fibers, the yarn formed being, before winding, subjected to the action of a false twist spindle disposed at the outlet of the condenser element, the method according to the invention being characterized in that the false twist spindle is selected

  among the pins that tend to exert a trac-

  The invention and the advantages that it brings will however be well understood thanks to the embodiment given hereinafter by way of indication but not limitation and which is illustrated by the single appended figure which is a

  schematic perspective view of an installation that allows

  both the implementation of the method according to the invention.

  Referring to the attached figure for carrying out the process according to the invention, an installation is used which comprises, in a manner similar to that forming the subject of the French patent application 82 01 383,

  a device for drawing a wick of fibers (1) (or ru-

  ban), wick from a non-conventional food source

  shown, this stretching system comprising, in the present case, a conventional drawing gear designated by the general reference (2) and which consists of a pair of feed rolls (3), a system with sleeves (4)

  and a pair of draw rolls (5).

  The stretching of the wick (1) is carried out between these

  elements by giving them different speeds.

  At the exit of the drawing device (2), so in the present case, in the immediate vicinity of the drawing rolls

  (5) is arranged a condenser guide (6) driven in rotation

  at a speed V2 which may be equal or different

  rente of the speed V1 output of the cylinder wick (5). When the speed V2 is equal to the speed Vl, this device makes it possible to condense the wick (1) in the direction of the width. On the other hand, if V2 is greater than V1, it is possible simultaneously to condense the wick and

to provide additional stretching.

  In the embodiment illustrated in the attached diagram, this condenser guide (6) is rotated by any appropriate means not shown and is essentially in the form of two cone truncated contiguous by their apex so as to obtain a throat

  V-shaped, whose branches are noticeably inclined

  born at an angle of about one another. The bottom of this groove is pierced with orifices and a.:-?

  suction system is provided inside the condensa-

(6).

  According to the invention, downstream of this condenser guide (6), is arranged a false twist spindle (7) which not only communicates a torsion which rises freely up to the surface of the condenser guide but also, moreover, tends to exert a pulling force

  T on the formed yarn. Preferably, we use as brokers

  false twist (7) a spindle of known type to

crossed straps.

  Downstream of this spindle (7) is a call system (4), the formed yarn being flown in (9) on a conventional system which does not impart torsion

additional to the formed yarn.

  By working under the above conditions, it has been found that the yarn formed has an improved cohesion compared to the previous yarn obtained by using another type of false twist spindle not exerting

  traction force on the wire during its formation.

Example:

  Fiber yarn is produced according to the process according to the invention from a polyester wick having a titer of 35,000 Dtex, the fiber cut being mm. The stretching system (2) is set to have a draw of 100, the speed V1 of the call rolls

(5) being regulated at 150 m / min.

  The condenser guide (6) is driven at a speed of rotation such that the speed V2 at the bottom of the groove is

  150 m / min. The belts of the spindle (7) will be inclined

  relative to each other so as to form an angle of 90 and the linear velocity of said belts

is set at 350 m / min.

  The yarn formed is called at a speed V3 of 148 m / min.

  A yarn (9) with a 350 Dtex titre is obtained which has very good cohesion and can be used

as is without further twisting.

  For comparison, if we replace the pin of

  false twist by belt friction used in accordance

  According to the invention, a spindle with a false disk torsion, commonly designated by the "external friction spindle" technicians, is also obtained, while working under the same conditions, with a yarn which has a good cohesion, but which, however, is less than

  obtained according to the invention.

  It is the same when we replace the belt spindle according to the invention and that instead uses a

internal friction pin.

  Of course, the invention is not limited to the example

  ple of realization described above but it covers all variants made in the same spirit. Thus, it could be envisaged, not to produce simple yarns but core yarns by introducing, in a known manner, a core wire upstream of the drawing rolls (5),

  even to obtain doubled yarns simultaneously

two locks.

-6-

Claims (2)

  1 / Process for obtaining a fiber yarn   which consists of stretching a bit of fibers (1) inside the   of a drawing system (2) proper, followed by a condensing element (6) in the form of a movable guide surface on which the fibers (1) are delivered tangentially and which tends to exert a pulling force on the free end of said fibers, the yarn formed being, before winding, subjected to the action of a false twist spindle (7) disposed at the outlet of the condenser element (6), characterized by the fact that the false twist spindle (7) is selected from the pins which tend to exert a pulling force on the file.   2 / A method according to claim 1i characterized in that the false twist spindle is a pin to crossed straps.