EP1673495A1 - Method and installation for producing a flat multifilament elastomer thread - Google Patents

Method and installation for producing a flat multifilament elastomer thread

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Publication number
EP1673495A1
EP1673495A1 EP04790409A EP04790409A EP1673495A1 EP 1673495 A1 EP1673495 A1 EP 1673495A1 EP 04790409 A EP04790409 A EP 04790409A EP 04790409 A EP04790409 A EP 04790409A EP 1673495 A1 EP1673495 A1 EP 1673495A1
Authority
EP
European Patent Office
Prior art keywords
wire
shaping
filaments
multifilament
flat
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.)
Granted
Application number
EP04790409A
Other languages
German (de)
French (fr)
Other versions
EP1673495B1 (en
Inventor
Galliano Boscolo
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.)
Albis SpA
Original Assignee
Albis SpA
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 Albis SpA filed Critical Albis SpA
Publication of EP1673495A1 publication Critical patent/EP1673495A1/en
Application granted granted Critical
Publication of EP1673495B1 publication Critical patent/EP1673495B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/70—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyurethanes
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/06—Wet spinning methods
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor

Definitions

  • the present invention relates to a new process for manufacturing a multifilament elastomeric wire with a flat cross section, as well as an installation for the manufacture of this wire.
  • the elastomeric yarn of the invention is advantageously used, for example but not exclusively, in the field of manufacturing hygienic articles, and in particular diapers.
  • PRIOR ART In the field of hygienic articles, and more particularly diapers, it is customary to incorporate elastic threads into the structure of the article.
  • elastic bands are inserted on the one hand at the level of the belt and on the other hand at the level of each leg passage, in order to ensure a better sealing of the faecal barriers of the diaper.
  • the expression “flat” wire or “flat” cross-section wire means a wire whose cross section has two main axes: a large axis subsequently designated width (L) (largest dimension of the section) and a small axis subsequently designated thickness (e) (smallest dimension of the section) which are substantially perpendicular.
  • a wire has a flat section within the meaning of the invention, when the width (L) is at least five times greater than the thickness (e), and preferably at minus ten times greater than the thickness (e).
  • the wires with a flat cross section there are in particular the wires having a cross section substantially in the shape of a rectangle, trapezium, ellipse, oval, etc.
  • the intermediate multifilament yarn, before shaping, which is obtained at the end of the aforementioned first manufacturing step is produced according to a process usual known as dry spinning process.
  • International patent application WO00 / 00681 describes a multifilament spandex yarn which is obtained by a wet spinning process.
  • the filaments which are extruded in the coagulation bath are withdrawn from said bath by means of a first roller which is placed just above the coagulation bath (see in particular example 1), and are then washed in a single washing bath equipped with two drive rollers, being wound several times around these two drive rollers.
  • the present invention aims to propose a new method for manufacturing an elastomeric wire with a flat section, which can be implemented on an industrial scale.
  • the method of manufacturing a flat multifilament elastomeric thread, by wet spinning which is the subject of claim 1.
  • the filaments are passed at the outlet of the extrusion dies, when they are still immersed in the coagulation bath, on a rotary shaping cylinder which has a channel on its periphery shaping, the filaments being positioned relative to each other in said shaping channel so as to form the required flat cross section.
  • the shaping channel is essential because it makes it possible to guide and maintain the filaments laterally during the shaping of the flat multifilament thread in the coagulation bath.
  • a multifilament yarn is obtained which has a more uniform thickness over its entire section, and the width of which is controlled and reproducible.
  • the implementation of several shaping channels on the cylinder makes it possible to envisage the parallel production of a plurality of wires (one wire per shaping channel).
  • the flattening of the multifilament yarn is carried out from the spinning stage, and while the filaments do not have not been dimensionally stabilized by the traditional heating operations (drying and cooking) of the spinning process.
  • the method of the invention advantageously comprises the additional technical characteristics of claims 2 to 11 taken individually or in combination with each other.
  • the subject of the invention is also a wet spinning installation for implementing the method of the invention, and according to any one of claims 12 to 20, as well as a multifilament elastomeric wire having a flat cross section. , obtained by wet spinning according to the method of the invention (claim 21).
  • the yarn of the invention advantageously comprises the additional technical characteristics of claims 22 to 25 taken individually or in combination with each other.
  • FIG. 1 schematically shows a first alternative embodiment of an installation for the production of multifilament yarns of the invention
  • - - the Figure 2 is a sectional view of the shaping cylinder and the accompanying roller associated with it
  • - Figure 3 is a top view of the comb of the installation of Figure 1 positioned upstream of the shaping cylinder in shape
  • - Figure 4 is a photograph (taken using an optical microscope) of the section of a wire (referenced A) of the invention having a titration of 1350 dtex
  • FIG. 1 schematically shows a first alternative embodiment of an installation for the production of multifilament yarns of the invention
  • - Figure 2 is a sectional view of the shaping cylinder and the accompanying roller associated with it
  • - Figure 3 is a top view of the comb of the installation of Figure 1 positioned upstream of the shaping cylinder in shape
  • - Figure 4 is a photograph (taken using an optical microscope) of the section of a wire (referenced A) of the invention
  • FIG. 5 is a photograph (taken by means of an optical microscope) of the section of a wire (referenced B) of the invention having a titration of 1450 dtex.
  • - Figure 6 is a sectional view of a shaping cylinder to illustrate another shaping groove profile
  • - Figure 7 shows schematically a second alternative embodiment of an installation for the production of multifilament yarns of the invention.
  • FIG. 1 shows an installation which conforms to a first variant embodiment of the invention, and which allows the spinning in the wet of multifilament yarns of synthetic elastomer and comprising a flat cross section.
  • This installation comprises the usual technical means which are found in the known installations and methods for wet spinning of multifilamentary round section yarns, namely: - a reservoir 1, containing an appropriate quantity, in the form of a viscous solution, of an extrudable elastomeric polymer (P) and capable of being spun in the wet; this reservoir is replenished (supply conduit 2) with said polymer P, by a production unit (not shown) of this polymer P; - a main pump 3 having the function of feeding a set 4 of metering pump 4a with the polymer P contained in the reservoir 1.
  • an extrusion / coagulation unit T1 allowing the continuous manufacture of a multifilament yarn (F ) - a plurality of successive washing units T2, ... Tn having the function of washing the multifilament yarn (F)
  • a finishing unit 8 commonly designated “WEF” (“Wet End Finish”) having the function of '' apply to the wire F a liquid solution S allowing to lubricate the wire and make it anti-static
  • a drying unit 9 for example of the type comprising an oven equipped with drums 9a with heating by steam and electricity on both last drums, - at least one drawing unit 10 followed by a cooking unit 11 (generally several successive drawing / cooking units are used), - a unit 12 for winding the multifilament yarn, for example on spools.
  • the polymers preferred for the manufacture of a multifilament yarn of the invention are polyurethanes. More particularly, but not exclusively, among the known polyurethanes, use is preferably made of those which are prepared from aromatic diisocyanate, for example 4,4'-diphenylmethanediisocyanate (MDl), from a linear polyether, for example polytetramethylene ether glycol (PTG), and an alcohol type 1,4 butadienol (1,4 butylene glycol) commonly designated "40H".
  • aromatic diisocyanate for example 4,4'-diphenylmethanediisocyanate (MDl)
  • MDl 4,4'-diphenylmethanediisocyanate
  • PEG polytetramethylene ether glycol
  • 40H alcohol type 1,4 butadienol
  • the extrusion / coagulation unit T1 comprises: a set 5 of extrusion dies 5a (“spinnerets”) which are immersed in a coagulation bath 6, and which are fed continuously and in parallel with the required quantity of solution of polymer P by the metering pumps 4a, - a cylinder 7 for shaping the wire, having the function, on the one hand, of bringing together and shaping, in the form of at least one flat multifilament wire (F), the filaments (f) which are extruded in parallel in the coagulation bath 6 at the outlet of the dies 5a, and on the other hand to bring out the multifilament yarn (F) from the coagulation bath 6.
  • spinnerets extrusion dies 5a
  • the coagulation bath 6 comprises so usual distilled water for example at a temperature of 60 ° C to 80 ° C mixed with a solvent such as DMF in an appropriate amount (for example with a concentration of 20%) in order to allow a complete extraction of the solvent ( DMF).
  • Each washing unit T2 to Tn has an open tank containing a washing bath formed by distilled water, for example at a temperature of 40 ° C to 80 ° C, and are equipped with two motorized rollers R1 and R2 which are partially immersed in the washing bath and which make it possible to run the multifilament yarn (F) at a predetermined speed in the washing bath.
  • the wire shaping cylinder 7 is a motorized cylinder, for example made of stainless steel, comprising at least one peripheral groove 7a (one groove per wire) in which the filaments (f) from the extrusion dies 5a are joined.
  • This groove 7a forms a channel of shaping which extends over the entire periphery of the cylinder 7.
  • this shaping channel has two opposite side walls 7b which are preferably divergent, so as to form a funnel facilitating the placement of the filaments in the shaping channel and the exit of the flat wire (F) from this shaping channel.
  • the shaping channel has in section a trapezoidal profile.
  • the dimension (a) represents the largest dimension base of the trapezoid, and corresponds to the width of the open face of the groove at the level of the surface of the shaping cylinder 7; the dimensions (b) represent the base of smaller dimension of the trapezoid, and corresponds to the width of the bottom of the groove 7a; The dimension (c) corresponds to the depth of the groove 7a.
  • FIG. 6 illustrates by way of example another variant profile for the shaping channel 7a.
  • the lateral walls 7b of the shaping channel 7a make it possible to guide and laterally maintain the filaments constituting the thread F, and thus to obtain at the outlet of the shaping cylinder 7 a multifilament thread (F) whose width is calibrated by reproducibly, and which is more homogeneous in thickness, compared for example to the use of a smooth cylinder.
  • a shaping cylinder has a plurality of parallel shaping channels 7a, allowing the manufacture in parallel and simultaneously of several flat multifilament son (F).
  • each shaping channel 7a is produced in the form of a peripheral groove hollowed out by machining in the surface of the cylinder.
  • the shaping cylinder 7 comprises at least two elements: a smooth base cylinder ( 1st element) covered with a cylindrical sheath ( 2nd element) which has been threaded and fixed on the base cylinder and which comprises the peripheral groove (s) 7a or equivalent.
  • the filaments (f) in the form of a bundle of filaments
  • the filaments (f) are brought from below into the groove 7a of the shaping cylinder 7 while still being immersed in the coagulation bath 6, and are positioned side by side in the groove 7a of the cylinder 7 and held laterally by the walls of the groove 7a so as to form the multifilament yarn (F).
  • the flat multifilament yarn (F) thus formed in the groove 7a is then taken out of the coagulation bath 6 by the shaping cylinder 7.
  • a rotary accompanying member in the form of a roller 7 'mounted free in rotation, of smaller diameter than the shaping cylinder 7, and which mainly fulfills the function following: the accompanying roller 7 'makes it possible to give, at the outlet of the shaping cylinder 7, a first tension to the multifilament thread (F) so that the multifilament thread (F) is applied against the surface of this cylinder which helps to maintain the flat shape in section of this wire.
  • the filaments of the multifilament yarn (F) are not compressed between the shaping cylinder 7 and the accompanying roller 7 '.
  • the accompanying roller 7 ′ has an elastomer type surface, and for example consists of a stainless steel cylinder coated on its periphery with a rubber surface coating.
  • upstream of the shaping cylinder 7 are additionally and optionally provided: - a comb 12 comprising two offset rows (FIG.
  • each bundle of filaments (f) intended to form a multifilamentary thread - between the extrusion dies 5a and the comb 12, two rods 13a and 13b which are preferably fixed.
  • the filaments (f) from the extrusion dies 5a are, at the outlet of the dies, gathered in the form of a bundle of filaments (a bundle of filaments (f) being intended to subsequently form a multifilament yarn).
  • Each bundle of filaments (f) passes between the two rods 13a and 13b along a substantially flat S-shaped path.
  • each bundle of filaments (f) is guided by the comb 12 in the direction of a groove 7a of the shaping cylinder 7, passing between two teeth of each row 12a, 12b of the comb 12.
  • the distance (d) between the two rows 12a, 12b of teeth of the comb 12 was 17mm
  • the spacing (p) between two teeth 12c of each row was 14mm.
  • this tensioning means 14 is composed of three rods 14a, 14b, and 14c of small diameter, which are preferably fixed. If necessary, in another variant, these rods could be rotatable.
  • the three rods 14a, 14b, 14c are positioned and spaced from one another so that the multifilament yarn (F) is deflected along a segmented path between the shaping cylinder 7 and the first transfer roller RT1, which allows to apply on the wire (F), in its portion ascending, a tension allowing the wire to keep its flattened shape in cross section.
  • the rods 14a to 14b could be replaced by any equivalent means allowing a tensioning of the wire.
  • the rods 14a to 14c could for example be replaced by a fixed guide profile in the form of a C, L or equivalent.
  • a rotary tensioning means 14 similar to the means 14 previously described is also mounted on the ascending portion of the multifilament yarn (F) between the cylinder R2 of the first washing unit T2 and the transfer roller RT2 between said unit T2 and the following washing unit T3.
  • a rotary pressing member 15 On the periphery of the first transfer roller RT1 between the extrusion / coagulation unit and the first washing unit T2 is also mounted a rotary pressing member 15, in the form of a pressing roller 15 of small diameter, and mounted free to rotate.
  • a stainless steel roller coated with a rubber coating is used.
  • This pressure roller 15 in combination with the transfer roller RT1 makes it possible to apply sufficient pressure to the wire (F) which at a minimum allows the wire to maintain its flat section when the direction of the wire changes (from its ascending portion to its descending portion), or even to obtain a better flattening of the wire.
  • a single pressure roller 15 one could use several (at least two) pressure rollers judiciously arranged on the periphery of the first transfer roller RT1.
  • upstream of the finishing unit 8 (WEF) are mounted two fixed rods 13'a and 13'b similar to the rods 13a and 13b and making it possible to improve the flattening of the multifilament yarn before the drying operations and cooking.
  • Multifilament Yarns of the Invention two types of polyurethane multifilament yarns, referenced below A and B, were produced by means of the installation of the Figure 1 previously described. In both cases, these were yarns composed of polyurethane filaments obtained from MDl, PTG and 40H.
  • the operating parameters (temperatures, rate of stretching) of the units 9, 10 and 11 respectively of drying, stretching and cooking are not indicated, because these parameters are fixed in the usual way and known by the skilled in the art, and moreover these parameters are identical for the two types of yarn A and B. It should also be pointed out that heating the multifilament yarn in the drying 9 and cooking 10 units also makes it possible, but not only, to fix the wire.
  • the parameters (17) and (18) are average values measured on a plurality of samples.
  • Parameter (18) [average thickness (e)] was also calculated on the basis of several samples, and is an approximate value given as an indication in order to compare the order of magnitude of the thickness with the width in section of the wire, it being specified that the thickness of the wire varies more or less over the section as a function of the more or less homogeneous distribution of the filaments (f) over the width of the wire.
  • the thickness values (e1; e2; e3) were equal to (89.64 ⁇ m; 67.33 ⁇ m; 77.51 ⁇ r ⁇ ).
  • This stretching contributes to the maintenance of the flattened section of the mutifilamentary wire.
  • this stretching ratio is more generally greater than or equal to 1/1, 2.
  • the invention is however not limited to this particular limit value of 1 / 1.2. In other embodiments covered by the invention, the stretching ratio could be lower than this ratio by 1 / 1.2. Subsequently, the thread does not undergo stretching when it passes through the following washing units (T3 to Tn ).
  • FIG. 7 shows a second alternative embodiment of an installation for the production of multifilament yarns of the invention.
  • the same references have been kept for the elements which are common to the two installations in FIGS. 1 and 7.
  • the main differences between the two installations in FIGS. 1 and 7 will now be detailed.
  • FIG. 7 In the coagulation bath 6, the installation of FIG. 7 comprises three successive combs 12, and a single rod 13 (instead of the two rods 13a and 13b in FIG. 1) for the pre-flattening of the filaments in the bath of coagulation, upstream of the shaping cylinder 7. Between the shaping cylinder (7) and the first transfer roller
  • FIG. 7 no longer includes an accompanying roller 7 '.
  • the flat multifilament yarn (F) is tensioned so as to maintain its flat cross section by means of four rods 14a, 14b, 14, 14d (instead of three rods in FIG. 1).
  • the pressure roller 15 of Figure 1 has been omitted.
  • the multifilament yarn (F) is kept in tension in its vertical paths (ascending and descending) between each transfer roller (RT1, RT2, RT3, ...) and the rollers R1 or R2 of each washing unit, by being deflected by means of four rods 14a to 14d (tensioning means 14 ').
  • the finishing unit 8 "WEF” has been modified so as to apply to both sides of the wire F a liquid solution S making it possible to lubricate the wire and make it anti-static (use of two application devices 8a and 8b, of the “kiss roll” type on either side of the multifilament yarn). Drying (9) -Doy stretching-Cooking (11) -Winding (12)
  • FIG. 7 After the finishing unit 8, the installation of FIG. 7 is identical to the installation of FIG. 1. For the sake of simplification, in FIG. 7, the stretching units 10, cooking 11, and winding 12, were not represented.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Artificial Filaments (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

The invention relates to the production of an especially polyurethane multifilament (F) elastomer thread by wet spinning. During the wet spinning process and before curing the multifilament thread, said multifilament thread (F) is shaped in such a way as to provide it with a flat cross-section.

Description

PROCEDE ET INSTALLATION POUR LA FABRICATION D'UN FIL ELASTOMERE MULTIFILAMENTAIRE PLAT PROCESS AND INSTALLATION FOR THE MANUFACTURE OF A FLAT MULTIFILAMENT ELASTOMERIC YARN
Domaine de l'invention La présente invention concerne un nouveau procédé de fabrication d'un fil élastomère multifilamentaire à section transversale plate, ainsi, qu'une installation pour la fabrication de ce fil. Le fil élastomère de l'invention est avantageusement utilisé, par exemple mais non exclusivement, dans le domaine de la fabrication d'articles hygiéniques, et en particulier de couches-culottes. Art Antérieur Dans le domaine des articles hygiéniques, et plus particulièrement des couches culottes, il est usuel d'incorporer des fils élastiques dans la structure de l'article. Dans le cas des couches-culottes, des élastiques sont insérés d'une part au niveau de la ceinture et d'autre part au niveau de chaque passage de jambe, afin d'assurer une meilleure étanchéité des barrières fécales de la couche. Ces fils élastiques doivent présenter des caractéristiques de « recovery » suffisantes pour que l'étanchéité obtenue soit optimale, il est également usuel d'intégrer dans la structure de la couche des fils élastiques en élastomère qui permettent de conférer à la couche, au repos, une forme anatomique de « cuillère ». Lorsque l'on utilise des fils élastiques traditionnels présentant une section transversale ronde, on constate souvent que la pression exercée par les fils élastiques sur la peau du porteur de la couche est excessive, notamment au niveau des jambes, et occasionne un risque important de marquage de la peau, voire d'irritation et/ou blessure de la peau du porteur. Cet inconvénient est encore plus prépondérant lorsque la couche-culotte est destinée à être au contact d'une peau sensible, tel que notamment une couche-culotte pour bébé. Dans le but de pallier l'inconvénient ci-dessus, il est ainsi recherché par les fabricants d'articles hygiéniques, et notamment de couches-culottes, de remplacer les fils élastiques à section ronde par des fils élastiques à section plate, ce qui permet avantageusement d'augmenter la surface de contact, et de ce fait de diminuer la pression exercée sur la peau avec la même tension. Dans le présent texte, et au sens de l'invention, on désigne par fil « plat » ou par fil à section transversale « plate », un fil dont la section transversale présente deux axes principaux : un grand axe désigné ultérieurement largeur (L) (plus grande dimension de la section) et un petit axe désigné ultérieurement épaisseur (e) (plus petite dimension de la section) qui sont sensiblement perpendiculaires. De préférence, et à titre indicatif, on considère qu'un fil présente une section plate au sens de l'invention, lorsque que la largeur (L) est au moins cinq fois supérieure à l'épaisseur (e), et de préférence au moins dix fois supérieure à l'épaisseur (e). A titres d'exemples non exhaustifs, parmi les fils à section transversale plate, on trouve notamment les fils présentant une section transversale sensiblement en forme de rectangle, de trapèze, d'ellipse, d'ovale, .... A ce jour, on a déjà proposé, notamment dans le brevet délivré aux Etats-Unis sous le numéro US 6248 197 B1, de réaliser un fil multifilamentaire en matériau élastomère, et notamment en polyuréthane, qui est mis en forme, et qui dans certaines formes de réalisation proposées (voir par exemple figure 3A) présente une section transversale plate. Selon la technique décrite dans cette publication, on fabrique dans une première étape un fil composé de plusieurs filaments juxtaposés en élastomère, et dans une seconde étape, on réalise postérieurement un traitement supplémentaire du fil multifilamentaire constant à chauffer et à presser les filaments, notamment entre des rouleaux adaptés, en sorte de mettre en forme en section transversale le fil multifilamentaire. Plus particulièrement, dans les exemples de réalisation décrits dans la publication précitée, le fil multifilamentaire intermédiaire, avant mise en forme, qui est obtenu à l'issue de la première étape de fabrication précitée est réalisé selon un procédé usuel dit de filage à sec («dry spinning process »). La demande de brevet internationale WO00/00681 décrit un fil multifilamentaire en élasthanne qui est obtenu par un procédé de filature au mouillé. Selon le procédé décrit, les filaments qui sont extrudés dans le bain de coagulation sont retirés dudit bain au moyen d'un premier rouleau qui est disposé juste au dessus du bain de coagulation (voir notamment exemple 1), et sont ensuite lavés dans un unique bain de lavage équipé de deux rouleaux d'entraînement, en étant enroulés plusieurs fois autour de ces deux rouleaux d'entraînement. Ensuite les filaments sont amenés jusqu'à des rouleaux de séchage, après avoir été comprimés entre le rouleau d'entraînement de sortie et un rouleau presseur. Dans une variante de réalisation, un rouleau presseur additionnel est utilisé pour aplatir les filaments par compression entre ce rouleau presseur et le premier rouleau précité (sortie du bain de coagulation) en sorte d'augmenter de 30% à 40% la largeur du ruban destiné à former le fil multifilamentaire. A la connaissance de la demanderesse, il n'existerait pas à ce jour sur le marché de fil multifilamentaire obtenu par filage au mouillé selon le procédé décrit dans cette demande de brevet internationale WO00/00681. Objectifs de l'invention La présente invention vise à proposer un nouveau procédé de fabrication d'un fil élastomère à section plate, qui peut être mis en oeuvre à une échelle industrielle. Résumé de l'invention Cet objectif est atteint par le procédé de fabrication d'un fil élastomère multifilamentaire plat, par filage au mouillé, faisant l'objet de la revendication 1. De manière essentielle selon l'invention, pour mettre en forme le fil au cours du procédé de filage au mouillé, on fait passer les filaments en sortie des filières d'extrusion, lorsqu'ils sont encore immergés dans le bain de coagulation, sur un cylindre de mise en forme rotatif qui comporte sur sa périphérie un canal de mise en forme, les filaments étant positionnés les uns par rapport aux autres dans ledit canal de mise en forme en sorte de former la section transversale plate requise. Le canal de mise en forme est essentiel car il permet de guider et de maintenir latéralement les filaments lors de la mise en forme du fil multifilamentaire plat dans le bain de coagulation. Comparativement à la mise en oeuvre d'un cylindre qui serait lisse (tel que par exemple dans la demande de brevet internationale précitée WO00/00681), on obtient un fil multifilamentaire qui présente une épaisseur plus homogène sur toute sa section, et dont la largeur est contrôlée et reproductible. En outre, la mise en œuvre de plusieurs canaux de mise en forme sur le cylindre permet d'envisager la fabrication en parallèle d'une pluralité de fils (un fil par canal de mise en forme). Comparativement au procédé de l'art antérieur décrit dans la publication précitée US 6248 197 B1, dans le procédé de l'invention la mise en forme à plat du fil multifilamentaire est réalisée dès le stade de la filature, et alors que les filaments n'ont pas été stabilisés dimensionnellement par les opérations traditionnelles de chauffage (séchage et cuisson) du procédé de filature. On évite ainsi une étape supplémentaire de mise en forme. Plus particulièrement, le procédé de l'invention comporte avantageusement les caractéristiques techniques additionnelles des revendications 2 à 11 prises isolément ou en combinaison les unes avec les autres. L'invention a également pour objets une installation de filature au mouillé pour la mise en oeuvre du procédé de l'invention, et conforme à l'une quelconque des revendications 12 à 20, ainsi qu'un fil élastomère mutifilamentaire présentant une section transversale plate, obtenu par filage au mouillé conformément au procédé de l'invention (revendication 21). Plus particulièrement, le fil de l'invention comporte avantageusement les caractéristiques techniques additionnelles des revendications 22 à 25 prises isolément ou en combinaison les unes avec les autres. Brèves description des dessins D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la descπption détaillée ci-après de deux installations pour la production de fils multifilamentaires conforme à l'invention et de plusieurs exemples de réalisation de fils multifilamentaire conformes à l'invention, laquelle description est donnée à titre d'exemple non exhaustif et non limitatif de l'invention, et en référence aux dessins annexés sur lesquels : - la figure 1 représente de manière schématique une première variante de réalisation d'une installation pour la production de fils multifilamentaires de l'invention, - - la figure 2 est une vue en section du cylindre de mise en forme et du rouleau d'accompagnement qui lui est associé, - la figure 3 est une vue de dessus du peigne de l'installation de la figure 1 positionné en amont du cylindre de mise en forme, - la figure 4 est une photographie (prise au moyen d'un microscope optique) de la section d'un fil (référencé A) de l'invention présentant un titrage de 1350 dtex, - la figure 5 est une photographie (prise au moyen d'un microscope optique) de la section d'un fil (référencé B) de l'invention présentant un titrage de 1450 dtex. - La figure 6 est une vue en section d'un cylindre de mise en forme permettant d'illustrer un autre profil de gorge de mise en forme, et - La figure 7 représente de manière schématique une seconde variante de réalisation d'une installation pour la production de fils multifilamentaires de l'invention. Description détaillée de l'invention On a représenté sur la figure 1, une installation qui est conforme à une première variante de réalisation de l'invention, et qui permet la filature au mouillé de fils multifilamentaire en élastomère synthétique et comportant une section transversale plate. Cette installation comporte des moyens techniques usuels que l'on retrouve dans les installations et procédés connus de filature au mouillé de fils multifilamentaires à section ronde, à savoir : - un réservoir 1 , contenant une quantité appropriée, sous forme d'une solution visqueuse, d'un polymère élastomère (P) extrudable et apte à être filé au mouillé ; ce réservoir est réapprovisionné (conduit d'alimentation 2) avec ledit polymère P, par une unité de production (non représentée) de ce polymère P ; - une pompe principale 3 ayant pour fonction d'alimenter un ensemble 4 de pompe de dosage 4a avec le polymère P contenu dans le réservoir 1. - une unité T1 d'extrusion/coagulation permettant la fabrication en continu d'un fil multifilamentaire (F) - une pluralité d'unité de lavage successives T2, ... Tn ayant pour fonction de laver le fil multifilamentaire (F), - une unité 8 de finition communément désignée « WEF » ( « Wet End Finish » ) ayant pour fonction d'appliquer sur le fil F une solution liquide S permettant de lubrifier le fil et de le rendre anti-statique, - une unité de séchage 9, par exemple du type comportant un four équipé de tambours 9a avec chauffage par vapeur et électricité sur les deux dernier tambours, - au moins une unité d'étirage 10 suivie d'un unité de cuisson 11 (généralement on utilise plusieurs unités d'étirage/cuisson successives), - une unité 12 d'enroulage du fil multifilamentaire par exemple sur des bobines. Parmi l'ensemble des polymères de type élastomère P aptes à être filés au mouillé et connus de l'homme du métier, les polymères préférés pour la fabrication d'un fil multifilamentaire de l'invention sont les polyuréthannes. Plus particulièrement, mais non exclusivement, parmi les polyuréthanes connus, on utilise de préférence ceux qui sont préparés à partir de diisocyanate aromatique, par exemple 4,4'- diphénylméthanediisocyanate (MDl), d'un polyéther linéaire, par exemple polytétraméthylèneether glycol (PTG), et d'un alcool type 1,4 butadienol (1,4 butylène glycol) communément désigné « 40H ». L'unité d'extrusion/coagulation T1 comporte : un ensemble 5 de filières d'extrusion 5a (« spinnerets ») qui sont plongées dans un bain de coagulation 6, et qui sont alimentées en continu et en parallèle avec la quantité requise de solution de polymère P par les pompes de dosage 4a, - un cylindre 7 de mise en forme du fil, ayant pour fonction d'une part de réunir et de mettre en forme, sous forme d'au moins un fil multifilamentaire plat (F), les filaments (f) qui sont extrudés en parallèle dans le bain de coagulation 6 en sortie des filières 5a, et d'autre part de faire sortir le fil multifilamentaire (F) du bain de coagulation 6. Le bain de coagulation 6 comporte de manière usuelle de l'eau distillée par exemple à une température de 60°C à 80°C mélangée avec un solvant tel que du DMF dans une quantité appropriée (par exemple avec une concentration de 20%) afin de permettre une complète extraction du solvant (DMF). Chaque unité de lavage T2 à Tn comporte un réservoir ouvert contenant un bain de lavage formé d'eau distillée par exemple à une température de 40°C à 80°C, et sont équipées de deux rouleaux motorisés R1 et R2 qui sont plongés en partie dans le bain de lavage et qui permettent de faire défiler le fil multifilamentaire (F) à une vitesse prédéterminée dans le bain de lavage. De manière usuelle, pour le transfert du fil vers l'unité suivante, chaque unité T1,... Tn est équipée en sortie d'un rouleau de transfert motorisé RT1, ... RTn. Le cylindre 7 de mise en forme du fil est un cylindre motorisé, par exemple en acier inoxydable, comportant au moins une gorge périphérique 7a (une gorge par fil) dans laquelle sont réunis les filaments (f) issus des filières d'extrusion 5a. Cette gorge 7a forme un canal de mise en forme qui s'étend sur toute la périphérie du cylindre 7. En référence à la figure 2, ce canal de mise en forme comporte deux parois latérales 7b en vis-à-vis qui sont de préférence divergentes, en sorte de former un entonnoir facilitant la mise en place des filaments dans le canal de mise en forme et la sortie du fil plat (F) de ce canal de mise en forme. Dans la variante particulière de la figure 2, le canal de mise en forme présente en section un profil en forme de trapèze. La dimension (a) représente la base de plus grande dimension du trapèze, et correspond à largeur de la face ouverte de la gorge au niveau de la surface du cylindre de mise en forme 7 ; la dimensions (b) représente la base de plus petite dimension du trapèze, et correspond à la largeur du fond de la gorge 7a ; La dimension (c) correspond à la profondeur de la gorge 7a. La figure 6 illustre à titre d'exemple une autre variante de profil pour le canal de mise en forme 7a. Les parois latérales 7b du canal de mise en forme 7a permettent de guider et maintenir latéralement les filaments constituant le fil F, et ainsi d'obtenir en sortie du cylindre de mise en forme 7 un fil multifilamentaire (F) dont la largeur est calibrée de manière reproductible, et qui est plus homogène en épaisseur, comparativement par exemple à l'utilisation d'un cylindre lisse. De surcroît, en pratique un cylindre de mise en forme comporte une pluralité de canaux de mise en forme parallèles 7a, permettant la fabrication en parallèle et simultanément de plusieurs fils multifilamentaire plats (F). Dans les variantes particulières de réalisation illustrées sur les figures 2 et 6, chaque canal de mise en forme 7a est réalisé sous la forme d'une gorge périphérique creusée par usinage dans la surface du cylindre. Dans une autre variante, le cylindre 7 de mise en forme comprend au moins deux éléments : un cylindre de base lisse (1er élément) recouvert d'un fourreau cylindrique (2ème élément) qui a été enfilé et fixé sur le cylindre de base et qui comporte la ou les gorges périphériques 7a ou équivalent. En référence à la figure 1, les filaments (f) (sous forme d'un faisceau de filaments) sont amenés par en dessous dans la gorge 7a du cylindre de mise en forme 7 en étant encore plongés dans le bain de coagulation 6, et sont positionnés côte à côte dans la gorge 7a du cylindre 7 et maintenus latéralement par les parois de la gorge 7a en sorte de former le fil multifilamentaire (F). Le fil multifilamentaire (F) plat ainsi formé dans la gorge 7a est ensuite sorti du bain de coagulation 6 par le cylindre de mise en forme 7. A la périphérie de ce cylindre de mise en forme 7, et en dehors du bain de coagulation 6, est de préférence (mais non nécessairement) monté un organe rotatif d'accompagnement, sous la forme d'un rouleau 7' monté libre en rotation, de plus faible diamètre que le cylindre de mise en forme 7, et qui remplit principalement la fonction suivante: le rouleau d'accompagnement 7' permet de donner, en sortie du cylindre de mise en forme 7, une première tension au fil multifilamentaire (F) de telle sorte que le fil multifilamentaire (F) est appliqué contre la surface de ce cylindre d'accompagnement, ce qui contribue à maintenir la forme plate en section de ce fil. Les filaments du fil multifilamentaire (F) ne sont pas comprimés entre le cylindre de mise en forme 7 et le rouleau d'accompagnement 7'. De préférence, le rouleau d'accompagnement 7' comporte une surface de type élastomère, et est par exemple constitué d'un cylindre en acier inoxydable revêtu sur sa périphérie d'un revêtement de surface en caoutchouc. Dans le bain de coagulation, en amont du cylindre de mise en forme 7 sont de manière additionnelle et facultative prévus : - un peigne 12 comportant deux rangées décalées (figure 3) 12a, 12b de dents 12c, et permettant en amont du cylindre de mise en forme 7 d'assurer un pré-guidage de chaque faisceau de filaments (f) destiné à former un fil multifilamentaire, - entre les filières d'extrusion 5a et le peigne 12, deux tiges 13a et 13b qui sont de préférence fixes. Les filaments (f) issus des filières d'extrusion 5a sont, en sortie de filières, rassemblés sous forme d'un faisceau de filaments (un faisceau de filaments (f) étant destiné à former ultérieurement un fil multifilamentaire). Chaque faisceau de filaments (f) passe entre les deux tiges 13a et 13b selon un trajet sensiblement en forme de S à plat. L'homme du métier adaptera judicieusement l'écartement entre ces deux tiges. Ces deux tiges 13a et 13b permettant un premier aplatissement sur les deux faces de chaque faisceau de filaments destiné à former un fil. Ensuite chaque faisceau de filaments (f) est guidé par le peigne 12 en direction d'une gorge 7a du cylindre de mise en forme 7, en passant entre deux dents de chaque rangée 12a, 12b du peigne 12. En référence à la figure 3, dans un exemple précis de réalisation donné à titre indicatif et non limitatif de l'invention, la distance (d) entre les deux rangées 12a, 12b de dents du peigne 12 valait 17mm, et l'écartement (p) entre deux dents 12c de chaque rangée valait 14mm. Entre l'ensemble cylindre 7/rouleau d'accompagnement 7' et le premier rouleau de transfert RT1 est en outre interposé un moyen 14 de mise en tension du fil mutifilamentaire dans sa portion ascendante jusqu'au rouleau transfert RT1. Dans l'exemple particulier illustré, ce moyen de mise en tension 14 est composé de trois tiges 14a, 14b, et 14c de faible diamètre, qui sont de préférence fixes. Au besoin, dans une autre variante, ces tiges pourraient être rotatives. Les trois tiges 14a, 14b, 14c sont positionnées et espacées les unes par rapport aux autres de telle sorte que le fil multifilamentaire (F) est dévié selon un trajet segmenté entre le cylindre de mise en forme 7 et le premier rouleau de transfert RT1, ce qui permet d'appliquer sur le fil (F), dans sa portion ascendante, une tension permettant au fil de conserver sa forme aplatie en section transversale. Les tiges 14a à 14b pourraient être remplacées par tout moyen équivalent permettant une mise en tension du fil. Dans une autre variante (non représentée), les tiges 14a à 14c pourraient par exemple être remplacées par un profil de guidage fixe en forme de C, de L ou équivalent. Dans une autre variante de réalisation de l'invention, il est envisageable de supprimer le rouleau d'accompagnement 7'. De préférence, mais non nécessairement, dans l'exemple particulier de la figure 1, un moyen de mise en tension rotatif 14' similaire au moyen 14 précédemment décrit est également monté sur le portion ascendante du fil multifilamentaire (F) entre le cylindre R2 de la première l'unité de lavage T2 et le rouleau transfert RT2 entre ladite unité T2 et l'unité de lavage suivante T3. A la périphérie du premier rouleau de transfert RT1 entre l'unité d'extrusion/coagulation et la première unité de lavage T2 est en outre monté un organe presseur rotatif 15, sous la forme d'un rouleau presseur 15 de faible diamètre, et monté libre en rotation. De préférence, on utilise un rouleau en acier inoxydable revêtu d'un revêtement en caoutchouc. Ce rouleau presseur 15 en combinaison avec le rouleau de transfert RT1 permet d'appliquer sur le fil (F) une pression suffisante qui au minimum permet au fil de conserver sa section plate lors du changement de direction du fil (de sa portion ascendante vers sa portion descendante), voire même d'obtenir un meilleur aplatissement du fil. Aux lieu et place d'un seul rouleau presseur 15, on pourrait utiliser plusieurs (au moins deux) rouleaux presseurs judicieusement disposés à la périphérie du premier rouleau de transfert RT1. De préférence, en amont de l'unité 8 de finition (WEF) sont montées deux tiges fixes 13'a et 13'b similaires aux tiges 13a et 13b et permettant d'améliorer l'aplatissement du fil multifilamentaire avant les opération de séchage et cuisson. Exemples de fils multifilamentaires de l'invention A titre d'exemples non exhaustifs et non limitatifs de l'invention, deux types de fils multifilamentaires en polyuréthane, référencés ci-après A et B, ont été réalisés au moyen de l'installation de la figure 1 précédemment décrite. Dans les deux cas, il s'agissait de fils composés de filaments en polyuréthane obtenu à partir de MDl, PTG et 40H. Les principales données, relatives à la fabrication et aux propriétés de ces deux exemples de fils multifilamentaire A et B de l'invention, sont résumées dans le tableau (I) ci-après. Dans ce tableau, les paramètres de fonctionnement (températures, taux d'étirage) des unités 9, 10 et 11 respectivement de séchage, d'étirage et cuisson ne sont pas indiqués, car ces paramètres sont fixés de manière usuelle et connue par l'homme du métier, et de surcroît ces paramètres sont identiques pour les deux types de fil A et B. Il convient également de souligner que le chauffage du fil multifilamentaire dans les unités de séchage 9 et de cuisson 10 permet également, mais pas seulement, de fixer le fil. Dans le tableau (I), les paramètres (17) et (18) sont des valeurs moyennes mesurées sur une pluralité d'échantillons. Le paramètre (18) [épaisseur moyenne (e)] a été calculé également sur la base de plusieurs échantillons, et est une valeur approximative donnée à titre indicatif afin de comparer l'ordre de grandeur de l'épaisseur avec la largeur en section du fil, étant précisé que l'épaisseur du fil varie plus ou moins sur la section en fonction de la répartition plus ou moins homogène des filaments (f) sur la largeur du fil. A titre d'illustration, sur la figure 5, les valeurs d'épaisseur (e1 ; e2 ; e3) valaient (89,64μm ; 67,33μm ; 77,51 μrη). D'une manière générale, pour un même titrage de fil, plus les filaments ont un faible diamètre et sont nombreux, et plus la répartition des filaments sur la largeur (L) du fil est homogène. A titrage donné, pour améliorer la régularité en épaisseur (e), il est donc souhaitable d'augmenter le nombre de filaments et de diminuer leur diamètre. On notera dans le tableau (I) que l'on fait subir au fil en cours de fabrication un étirage lors de son passage dans la première unité de lavage T2 (vitesse du premier rouleau R1 de T2 de l'ordre de 24 m/min et vitesse du second rouleau R2 de T2 de l'ordre de 42 m/min), soit un ratio d'étirage de l'ordre de 1/1,75. Cet étirage contribue au maintien de la section aplatie du fil mutifilamentaire. De préférence, ce ratio d'étirage est d'une manière plus générale supérieure ou égal à 1 /1 ,2. Dans sa portée la plus générale, l'invention n'est toutefois pas limitée à cette valeur limite particulière de 1/1,2. Dans d'autres réalisations couvertes par l'invention, le ratio d'étirage pourrait être inférieur à ce ratio de 1/1,2 Ultérieurement, le fil ne subit pas détirage lors de son passage dans les unités de lavage suivantes (T3 à Tn). Field of the Invention The present invention relates to a new process for manufacturing a multifilament elastomeric wire with a flat cross section, as well as an installation for the manufacture of this wire. The elastomeric yarn of the invention is advantageously used, for example but not exclusively, in the field of manufacturing hygienic articles, and in particular diapers. PRIOR ART In the field of hygienic articles, and more particularly diapers, it is customary to incorporate elastic threads into the structure of the article. In the case of diapers, elastic bands are inserted on the one hand at the level of the belt and on the other hand at the level of each leg passage, in order to ensure a better sealing of the faecal barriers of the diaper. These elastic threads must have sufficient "recovery" characteristics for the seal obtained to be optimal, it is also customary to integrate into the structure of the layer elastic elastomer threads which make it possible to impart to the layer, at rest, an anatomical shape of a "spoon". When using conventional elastic threads having a round cross section, it is often found that the pressure exerted by the elastic threads on the skin of the wearer of the diaper is excessive, in particular at the legs, and poses a significant risk of marking. of the skin, or even irritation and / or injury of the wearer's skin. This drawback is even more prevalent when the diaper is intended to be in contact with sensitive skin, such as in particular a diaper for babies. In order to overcome the above drawback, it is thus sought by the manufacturers of hygienic articles, and in particular diapers, to replace the elastic threads with round section by elastic threads with flat section, which advantageously makes it possible to increase the contact surface, and consequently to decrease the pressure exerted on the skin with the same tension. In the present text, and within the meaning of the invention, the expression “flat” wire or “flat” cross-section wire means a wire whose cross section has two main axes: a large axis subsequently designated width (L) (largest dimension of the section) and a small axis subsequently designated thickness (e) (smallest dimension of the section) which are substantially perpendicular. Preferably, and as an indication, it is considered that a wire has a flat section within the meaning of the invention, when the width (L) is at least five times greater than the thickness (e), and preferably at minus ten times greater than the thickness (e). By way of non-exhaustive examples, among the wires with a flat cross section, there are in particular the wires having a cross section substantially in the shape of a rectangle, trapezium, ellipse, oval, etc. To date, it has already been proposed, in particular in the patent issued in the United States under the number US 6248 197 B1, to produce a multifilament yarn of elastomeric material, and in particular of polyurethane, which is shaped, and which in certain embodiments proposed (see for example Figure 3A) has a flat cross section. According to the technique described in this publication, a yarn composed of several filaments juxtaposed in elastomer is produced in a first step, and in a second step, an additional treatment of the constant multifilament yarn is subsequently performed to heat and press the filaments, in particular between suitable rollers, so as to shape the multifilament yarn in cross section. More particularly, in the exemplary embodiments described in the aforementioned publication, the intermediate multifilament yarn, before shaping, which is obtained at the end of the aforementioned first manufacturing step, is produced according to a process usual known as dry spinning process. International patent application WO00 / 00681 describes a multifilament spandex yarn which is obtained by a wet spinning process. According to the method described, the filaments which are extruded in the coagulation bath are withdrawn from said bath by means of a first roller which is placed just above the coagulation bath (see in particular example 1), and are then washed in a single washing bath equipped with two drive rollers, being wound several times around these two drive rollers. Then the filaments are brought to drying rollers, after being compressed between the output drive roller and a pressure roller. In an alternative embodiment, an additional pressure roller is used to flatten the filaments by compression between this pressure roller and the aforementioned first roller (leaving the coagulation bath) so as to increase from 30% to 40% the width of the ribbon intended to form the multifilament yarn. To the knowledge of the applicant, to date there does not exist on the market for multifilament yarn obtained by wet spinning according to the process described in this international patent application WO00 / 00681. OBJECTIVES OF THE INVENTION The present invention aims to propose a new method for manufacturing an elastomeric wire with a flat section, which can be implemented on an industrial scale. Summary of the invention This object is achieved by the method of manufacturing a flat multifilament elastomeric thread, by wet spinning, which is the subject of claim 1. Essentially according to the invention, for shaping the thread during the wet spinning process, the filaments are passed at the outlet of the extrusion dies, when they are still immersed in the coagulation bath, on a rotary shaping cylinder which has a channel on its periphery shaping, the filaments being positioned relative to each other in said shaping channel so as to form the required flat cross section. The shaping channel is essential because it makes it possible to guide and maintain the filaments laterally during the shaping of the flat multifilament thread in the coagulation bath. Compared to the implementation of a cylinder which would be smooth (such as for example in the aforementioned international patent application WO00 / 00681), a multifilament yarn is obtained which has a more uniform thickness over its entire section, and the width of which is controlled and reproducible. In addition, the implementation of several shaping channels on the cylinder makes it possible to envisage the parallel production of a plurality of wires (one wire per shaping channel). Compared to the process of the prior art described in the aforementioned publication US 6248 197 B1, in the process of the invention the flattening of the multifilament yarn is carried out from the spinning stage, and while the filaments do not have not been dimensionally stabilized by the traditional heating operations (drying and cooking) of the spinning process. This avoids an additional shaping step. More particularly, the method of the invention advantageously comprises the additional technical characteristics of claims 2 to 11 taken individually or in combination with each other. The subject of the invention is also a wet spinning installation for implementing the method of the invention, and according to any one of claims 12 to 20, as well as a multifilament elastomeric wire having a flat cross section. , obtained by wet spinning according to the method of the invention (claim 21). More particularly, the yarn of the invention advantageously comprises the additional technical characteristics of claims 22 to 25 taken individually or in combination with each other. Brief description of the drawings Other characteristics and advantages of the invention will become apparent more clearly on reading the detailed description below of two installations for the production of multifilament yarns according to the invention and of several exemplary embodiments of multifilamentary yarns according to the invention, which description is given by way of example non-exhaustive and non-limiting of the invention, and with reference to the accompanying drawings in which: - Figure 1 schematically shows a first alternative embodiment of an installation for the production of multifilament yarns of the invention, - - the Figure 2 is a sectional view of the shaping cylinder and the accompanying roller associated with it, - Figure 3 is a top view of the comb of the installation of Figure 1 positioned upstream of the shaping cylinder in shape, - Figure 4 is a photograph (taken using an optical microscope) of the section of a wire (referenced A) of the invention having a titration of 1350 dtex, - FIG. 5 is a photograph (taken by means of an optical microscope) of the section of a wire (referenced B) of the invention having a titration of 1450 dtex. - Figure 6 is a sectional view of a shaping cylinder to illustrate another shaping groove profile, and - Figure 7 shows schematically a second alternative embodiment of an installation for the production of multifilament yarns of the invention. DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows an installation which conforms to a first variant embodiment of the invention, and which allows the spinning in the wet of multifilament yarns of synthetic elastomer and comprising a flat cross section. This installation comprises the usual technical means which are found in the known installations and methods for wet spinning of multifilamentary round section yarns, namely: - a reservoir 1, containing an appropriate quantity, in the form of a viscous solution, of an extrudable elastomeric polymer (P) and capable of being spun in the wet; this reservoir is replenished (supply conduit 2) with said polymer P, by a production unit (not shown) of this polymer P; - a main pump 3 having the function of feeding a set 4 of metering pump 4a with the polymer P contained in the reservoir 1. - an extrusion / coagulation unit T1 allowing the continuous manufacture of a multifilament yarn (F ) - a plurality of successive washing units T2, ... Tn having the function of washing the multifilament yarn (F), - a finishing unit 8 commonly designated “WEF” (“Wet End Finish”) having the function of '' apply to the wire F a liquid solution S allowing to lubricate the wire and make it anti-static, - a drying unit 9, for example of the type comprising an oven equipped with drums 9a with heating by steam and electricity on both last drums, - at least one drawing unit 10 followed by a cooking unit 11 (generally several successive drawing / cooking units are used), - a unit 12 for winding the multifilament yarn, for example on spools. Among all the polymers of elastomer type P capable of being spun in the wet and known to those skilled in the art, the polymers preferred for the manufacture of a multifilament yarn of the invention are polyurethanes. More particularly, but not exclusively, among the known polyurethanes, use is preferably made of those which are prepared from aromatic diisocyanate, for example 4,4'-diphenylmethanediisocyanate (MDl), from a linear polyether, for example polytetramethylene ether glycol (PTG), and an alcohol type 1,4 butadienol (1,4 butylene glycol) commonly designated "40H". The extrusion / coagulation unit T1 comprises: a set 5 of extrusion dies 5a (“spinnerets”) which are immersed in a coagulation bath 6, and which are fed continuously and in parallel with the required quantity of solution of polymer P by the metering pumps 4a, - a cylinder 7 for shaping the wire, having the function, on the one hand, of bringing together and shaping, in the form of at least one flat multifilament wire (F), the filaments (f) which are extruded in parallel in the coagulation bath 6 at the outlet of the dies 5a, and on the other hand to bring out the multifilament yarn (F) from the coagulation bath 6. The coagulation bath 6 comprises so usual distilled water for example at a temperature of 60 ° C to 80 ° C mixed with a solvent such as DMF in an appropriate amount (for example with a concentration of 20%) in order to allow a complete extraction of the solvent ( DMF). Each washing unit T2 to Tn has an open tank containing a washing bath formed by distilled water, for example at a temperature of 40 ° C to 80 ° C, and are equipped with two motorized rollers R1 and R2 which are partially immersed in the washing bath and which make it possible to run the multifilament yarn (F) at a predetermined speed in the washing bath. Usually, for the wire transfer to the next unit, each unit T1, ... Tn is fitted at the output with a motorized transfer roller RT1, ... RTn. The wire shaping cylinder 7 is a motorized cylinder, for example made of stainless steel, comprising at least one peripheral groove 7a (one groove per wire) in which the filaments (f) from the extrusion dies 5a are joined. This groove 7a forms a channel of shaping which extends over the entire periphery of the cylinder 7. With reference to FIG. 2, this shaping channel has two opposite side walls 7b which are preferably divergent, so as to form a funnel facilitating the placement of the filaments in the shaping channel and the exit of the flat wire (F) from this shaping channel. In the particular variant of Figure 2, the shaping channel has in section a trapezoidal profile. The dimension (a) represents the largest dimension base of the trapezoid, and corresponds to the width of the open face of the groove at the level of the surface of the shaping cylinder 7; the dimensions (b) represent the base of smaller dimension of the trapezoid, and corresponds to the width of the bottom of the groove 7a; The dimension (c) corresponds to the depth of the groove 7a. FIG. 6 illustrates by way of example another variant profile for the shaping channel 7a. The lateral walls 7b of the shaping channel 7a make it possible to guide and laterally maintain the filaments constituting the thread F, and thus to obtain at the outlet of the shaping cylinder 7 a multifilament thread (F) whose width is calibrated by reproducibly, and which is more homogeneous in thickness, compared for example to the use of a smooth cylinder. In addition, in practice a shaping cylinder has a plurality of parallel shaping channels 7a, allowing the manufacture in parallel and simultaneously of several flat multifilament son (F). In the particular variant embodiments illustrated in FIGS. 2 and 6, each shaping channel 7a is produced in the form of a peripheral groove hollowed out by machining in the surface of the cylinder. In another variant, the shaping cylinder 7 comprises at least two elements: a smooth base cylinder ( 1st element) covered with a cylindrical sheath ( 2nd element) which has been threaded and fixed on the base cylinder and which comprises the peripheral groove (s) 7a or equivalent. With reference to FIG. 1, the filaments (f) (in the form of a bundle of filaments) are brought from below into the groove 7a of the shaping cylinder 7 while still being immersed in the coagulation bath 6, and are positioned side by side in the groove 7a of the cylinder 7 and held laterally by the walls of the groove 7a so as to form the multifilament yarn (F). The flat multifilament yarn (F) thus formed in the groove 7a is then taken out of the coagulation bath 6 by the shaping cylinder 7. At the periphery of this shaping cylinder 7, and outside the coagulation bath 6 is preferably (but not necessarily) mounted a rotary accompanying member, in the form of a roller 7 'mounted free in rotation, of smaller diameter than the shaping cylinder 7, and which mainly fulfills the function following: the accompanying roller 7 'makes it possible to give, at the outlet of the shaping cylinder 7, a first tension to the multifilament thread (F) so that the multifilament thread (F) is applied against the surface of this cylinder which helps to maintain the flat shape in section of this wire. The filaments of the multifilament yarn (F) are not compressed between the shaping cylinder 7 and the accompanying roller 7 '. Preferably, the accompanying roller 7 ′ has an elastomer type surface, and for example consists of a stainless steel cylinder coated on its periphery with a rubber surface coating. In the coagulation bath, upstream of the shaping cylinder 7 are additionally and optionally provided: - a comb 12 comprising two offset rows (FIG. 3) 12a, 12b of teeth 12c, and allowing upstream of the shaping cylinder in shape 7 to provide a pre-guidance of each bundle of filaments (f) intended to form a multifilamentary thread, - between the extrusion dies 5a and the comb 12, two rods 13a and 13b which are preferably fixed. The filaments (f) from the extrusion dies 5a are, at the outlet of the dies, gathered in the form of a bundle of filaments (a bundle of filaments (f) being intended to subsequently form a multifilament yarn). Each bundle of filaments (f) passes between the two rods 13a and 13b along a substantially flat S-shaped path. Those skilled in the art will judiciously adapt the spacing between these two rods. These two rods 13a and 13b allowing a first flattening on the two faces of each bundle of filaments intended to form a wire. Then each bundle of filaments (f) is guided by the comb 12 in the direction of a groove 7a of the shaping cylinder 7, passing between two teeth of each row 12a, 12b of the comb 12. With reference to FIG. 3 , in a specific embodiment given as an indication and not limiting of the invention, the distance (d) between the two rows 12a, 12b of teeth of the comb 12 was 17mm, and the spacing (p) between two teeth 12c of each row was 14mm. Between the cylinder 7 / support roller 7 ′ assembly and the first transfer roller RT1 is further interposed a means 14 for tensioning the multifilament yarn in its ascending portion up to the transfer roller RT1. In the particular example illustrated, this tensioning means 14 is composed of three rods 14a, 14b, and 14c of small diameter, which are preferably fixed. If necessary, in another variant, these rods could be rotatable. The three rods 14a, 14b, 14c are positioned and spaced from one another so that the multifilament yarn (F) is deflected along a segmented path between the shaping cylinder 7 and the first transfer roller RT1, which allows to apply on the wire (F), in its portion ascending, a tension allowing the wire to keep its flattened shape in cross section. The rods 14a to 14b could be replaced by any equivalent means allowing a tensioning of the wire. In another variant (not shown), the rods 14a to 14c could for example be replaced by a fixed guide profile in the form of a C, L or equivalent. In another alternative embodiment of the invention, it is conceivable to omit the accompanying roller 7 '. Preferably, but not necessarily, in the particular example of FIG. 1, a rotary tensioning means 14 'similar to the means 14 previously described is also mounted on the ascending portion of the multifilament yarn (F) between the cylinder R2 of the first washing unit T2 and the transfer roller RT2 between said unit T2 and the following washing unit T3. On the periphery of the first transfer roller RT1 between the extrusion / coagulation unit and the first washing unit T2 is also mounted a rotary pressing member 15, in the form of a pressing roller 15 of small diameter, and mounted free to rotate. Preferably, a stainless steel roller coated with a rubber coating is used. This pressure roller 15 in combination with the transfer roller RT1 makes it possible to apply sufficient pressure to the wire (F) which at a minimum allows the wire to maintain its flat section when the direction of the wire changes (from its ascending portion to its descending portion), or even to obtain a better flattening of the wire. Instead of a single pressure roller 15, one could use several (at least two) pressure rollers judiciously arranged on the periphery of the first transfer roller RT1. Preferably, upstream of the finishing unit 8 (WEF) are mounted two fixed rods 13'a and 13'b similar to the rods 13a and 13b and making it possible to improve the flattening of the multifilament yarn before the drying operations and cooking. Examples of Multifilament Yarns of the Invention By way of non-exhaustive and nonlimiting examples of the invention, two types of polyurethane multifilament yarns, referenced below A and B, were produced by means of the installation of the Figure 1 previously described. In both cases, these were yarns composed of polyurethane filaments obtained from MDl, PTG and 40H. The main data, relating to the manufacture and to the properties of these two examples of multifilament yarns A and B of the invention, are summarized in table (I) below. In this table, the operating parameters (temperatures, rate of stretching) of the units 9, 10 and 11 respectively of drying, stretching and cooking are not indicated, because these parameters are fixed in the usual way and known by the skilled in the art, and moreover these parameters are identical for the two types of yarn A and B. It should also be pointed out that heating the multifilament yarn in the drying 9 and cooking 10 units also makes it possible, but not only, to fix the wire. In table (I), the parameters (17) and (18) are average values measured on a plurality of samples. Parameter (18) [average thickness (e)] was also calculated on the basis of several samples, and is an approximate value given as an indication in order to compare the order of magnitude of the thickness with the width in section of the wire, it being specified that the thickness of the wire varies more or less over the section as a function of the more or less homogeneous distribution of the filaments (f) over the width of the wire. By way of illustration, in FIG. 5, the thickness values (e1; e2; e3) were equal to (89.64 μm; 67.33 μm; 77.51 μrη). In general, for the same wire titration, the smaller the number of filaments and the more numerous they are, the more homogeneous the distribution of the filaments over the width (L) of the wire. At given titration, to improve the regularity in thickness (e), it is therefore desirable to increase the number of filaments and to decrease their diameter. It will be noted in table (I) that the wire undergoing stretching is subjected to stretching during its passage through the first washing unit T2 (speed of the first roller R1 of T2 of the order of 24 m / min and speed of the second roller R2 of T2 of the order of 42 m / min), ie a stretching ratio of the order of 1 / 1.75. This stretching contributes to the maintenance of the flattened section of the mutifilamentary wire. Preferably, this stretching ratio is more generally greater than or equal to 1/1, 2. In its most general scope, the invention is however not limited to this particular limit value of 1 / 1.2. In other embodiments covered by the invention, the stretching ratio could be lower than this ratio by 1 / 1.2. Subsequently, the thread does not undergo stretching when it passes through the following washing units (T3 to Tn ).
On a représenté sur la figure 7 une seconde variante de réalisation d'une installation pour la production de fils multifilamentaires de l'invention. Par soucis de simplification et de clarté, on a conservé les mêmes références pour les éléments qui sont communs aux deux installations des figures 1 et 7. Les principales différences entre les deux installations de figures 1 et 7 vont à présent être détaillées. Dans le bain de coagulation (6)FIG. 7 shows a second alternative embodiment of an installation for the production of multifilament yarns of the invention. For the sake of simplification and clarity, the same references have been kept for the elements which are common to the two installations in FIGS. 1 and 7. The main differences between the two installations in FIGS. 1 and 7 will now be detailed. In the coagulation bath (6)
Dans le bain de coagulation 6, l'installation de la figure 7 comporte trois peignes 12 successifs, et une unique tige 13 (au lieu des deux tiges 13a et 13b sur la figure 1) pour le pré-aplatissement des filaments dans le bain de coagulation, en amont du cylindre de mise en forme 7. Entre le cylindre de mise en forme (7) et le premier rouleau de transfertIn the coagulation bath 6, the installation of FIG. 7 comprises three successive combs 12, and a single rod 13 (instead of the two rods 13a and 13b in FIG. 1) for the pre-flattening of the filaments in the bath of coagulation, upstream of the shaping cylinder 7. Between the shaping cylinder (7) and the first transfer roller
(RIl)(RIL)
L'installation de la figure 7 ne comporte plus de rouleau d'accompagnement 7'. Le fil multifilamentaire plat (F) est mis en tension en sorte de maintenir sa section transversale plate au moyen de quatre tiges 14a, 14b, 14, 14d (au lieu de trois tiges sur la figure 1). Le rouleau presseur 15 de la figure 1 a été supprimé. Dans les unités de lavage T2 à Tn Le fil multifilamentaire (F) est maintenu en tension dans ses trajets verticaux (ascendant et descendant) entre chaque rouleau de transfert (RT1, RT2, RT3,...) et les rouleaux R1 ou R2 de chaque unité de lavage, en étant dévié au moyen de quatre tiges 14a à 14d (moyen de mise en tension 14'). Unité (8) de finition « WEF »The installation of FIG. 7 no longer includes an accompanying roller 7 '. The flat multifilament yarn (F) is tensioned so as to maintain its flat cross section by means of four rods 14a, 14b, 14, 14d (instead of three rods in FIG. 1). The pressure roller 15 of Figure 1 has been omitted. In washing units T2 to Tn The multifilament yarn (F) is kept in tension in its vertical paths (ascending and descending) between each transfer roller (RT1, RT2, RT3, ...) and the rollers R1 or R2 of each washing unit, by being deflected by means of four rods 14a to 14d (tensioning means 14 '). "WEF" finishing unit (8)
L'unité 8 de finition « WEF » a été modifié en sorte d'appliquer sur les deux faces du fil F une solution liquide S permettant de lubrifier le fil et de le rendre anti-statique (mis en oeuvre de deux dispositifs d'application 8a et 8b, de type « kiss roll » de part d'autre du fil multifilamentaire). Séchage (9)-Etirage dOY-Cuisson (11)-Enroulement(12)The finishing unit 8 "WEF" has been modified so as to apply to both sides of the wire F a liquid solution S making it possible to lubricate the wire and make it anti-static (use of two application devices 8a and 8b, of the “kiss roll” type on either side of the multifilament yarn). Drying (9) -Doy stretching-Cooking (11) -Winding (12)
Après l'unité de finition 8, l'installation de la figure 7 est identique à l'installation de la figure 1. Par soucis de simplification, sur la figure 7, les unités d'étirage 10, cuisson 11, et enroulement 12, n'ont pas été représentées. After the finishing unit 8, the installation of FIG. 7 is identical to the installation of FIG. 1. For the sake of simplification, in FIG. 7, the stretching units 10, cooking 11, and winding 12, were not represented.

Claims

REVENDICATIONS
1. Procédé de fabrication d'un fil élastomère multifilamentaire plat, selon lequel on fabrique ledit fil élastomère multifilamentaire (F) par filage au mouillé, et au cours de la filature au mouillé et avant l'opération de cuisson du fil multifilamentaire, on met en forme le fil mutifilamentaire (F) en sorte de lui conférer une section transversale plate, caractérisé en ce que pour mettre en forme le fil, on fait passer les filaments (f) en sortie des filières d'extrusion (5a), lorsqu'ils sont encore immergés dans le bain de coagulation, sur un cylindre de mise en forme (7) rotatif qui comporte sur sa périphérie un canal de mise en forme (7a), les filaments étant positionnés les uns par rapport aux autres dans ledit canal de mise en forme (7a) en sorte de former la section transversale plate requise.1. A method of manufacturing a flat multifilament elastomeric wire, according to which said multifilament elastomeric wire (F) is manufactured by wet spinning, and during wet spinning and before the cooking operation of the multifilament wire, shaped the mutifilamentary wire (F) so as to give it a flat cross section, characterized in that to shape the wire, the filaments (f) are passed through at the outlet of the extrusion dies (5a), when they are still immersed in the coagulation bath, on a rotary shaping cylinder (7) which has on its periphery a shaping channel (7a), the filaments being positioned relative to each other in said channel shaping (7a) so as to form the required flat cross section.
2. Procédé selon la revendication 1 caractérisé en ce que chaque canal de mise en forme (7a) du cylindre de mise en forme (7) est réalisé sous la forme d'une gorge (7a).2. Method according to claim 1 characterized in that each shaping channel (7a) of the shaping cylinder (7) is produced in the form of a groove (7a).
3. Procédé selon la revendication 1 ou 2 caractérisé en ce que chaque canal de mise en forme (7a) comporte deux parois divergentes en vis-à-vis formant entonnoir.3. Method according to claim 1 or 2 characterized in that each shaping channel (7a) has two divergent walls facing each other forming a funnel.
4. Procédé selon l'une quelconque des revendication 1 à 3 caractérisé en ce que le cylindre de mise en forme (7) comporte plusieurs canaux de mise en forme (7a), et en ce qu'on fabrique simultanément plusieurs fils multifilamentaires (F) en parallèle, à raison d'un fil par canal de mise en forme (7a).4. Method according to any one of claims 1 to 3 characterized in that the shaping cylinder (7) comprises several shaping channels (7a), and in that several multifilament son (F ) in parallel, at the rate of one wire per shaping channel (7a).
5. Procédé selon l'une quelconque des revendications 1 à 4 caractérisé en ce qu'on fait passer le fil multifilamentaire plat (F) dans au moins deux unités de lavages successives (T2,...Tn). 5. Method according to any one of claims 1 to 4 characterized in that the flat multifilament yarn (F) is passed through at least two successive washing units (T2, ... Tn).
6. Procédé selon l'une quelconque des revendications 1 à 5 caractérisé en ce qu'en aval du cylindre de mise en forme (7), on met en tension le fil mutifilamentaire (F) en le déviant en sorte de maintenir la section plate de ce fil.6. Method according to any one of claims 1 to 5 characterized in that downstream of the shaping cylinder (7), one puts in tension the multifilamentary wire (F) by deflecting it so as to maintain the flat section of this wire.
7. Procédé selon l'une quelconque des revendications 1 à 6 caractérisé en ce qu'en sortie de filière d'extrusion (5a), on pré-aplatit les filaments immergés dans le bain de coagulation, en amont du cylindre de mise en forme (7) .7. Method according to any one of claims 1 to 6 characterized in that at the outlet of the extrusion die (5a), the filaments immersed in the coagulation bath are pre-flattened, upstream of the shaping cylinder (7).
8. Procédé selon l'une quelconque des revendications 1 à 7 caractérisé en ce que le faisceau de filaments (f) destiné à former le fil mutifilamentaire (2) passe entre les dents (12c) d'au moins un peigne (12) positionné immédiatement en amont du cylindre de mise en forme (7).8. Method according to any one of claims 1 to 7 characterized in that the bundle of filaments (f) intended to form the mutifilamentary thread (2) passes between the teeth (12c) of at least one comb (12) positioned immediately upstream of the shaping cylinder (7).
9. Procédé selon l'une quelconque des revendications 1 à 8 caractérisé en ce qu'on fait subir au fil multifilamentaire un étirage lors de son passage dans la première unité de lavage (T2). 9. Method according to any one of claims 1 to 8 characterized in that the multifilament yarn is subjected to stretching during its passage through the first washing unit (T2).
10. Procédé selon la revendication 9 caractérisé en ce que l'étirage est d'au moins 1/1,2. 10. Method according to claim 9 characterized in that the stretching is at least 1 / 1.2.
11. Procédé selon l'une quelconque des revendications 1 à 10 caractérisé en ce que les filaments (f) constitutifs du fil (F) sont en polyuréthane. 11. Method according to any one of claims 1 to 10 characterized in that the filaments (f) constituting the wire (F) are made of polyurethane.
12. Installation de filature au mouillé pour la fabrication d'un fil élastomère multifilamentaire plat, ladite installation comportant un bain de coagulation (6) et des moyens de mise en forme du fil mutifilamentaire (F) permettant de conférer au fil mutifilamentaire (F) une section transversale plate avant l'opération de cuisson du fil, caractérisée en ce que lesdits moyens de mise en forme comportent un cylindre de mise en forme (7) rotatif qui est immergé au moins en partie dans le bain de coagulation (6), et qui comprend sur sa périphérie au moins un canal (7a) de mise en forme. 12. Wet spinning installation for the manufacture of a flat multifilament elastomeric wire, said installation comprising a coagulation bath (6) and means for shaping the mutifilamentary wire (F) making it possible to impart to the mutifilamentary wire (F) a flat cross section before the wire baking operation, characterized in that said shaping means comprise a rotary shaping cylinder (7) which is at least partly immersed in the coagulation bath (6), and which comprises on its periphery at least one shaping channel (7a).
13. Installation selon la revendication 12 caractérisée en ce que chaque canal de mise en forme (7a) est réalisé sous la forme d'une gorge périphérique (7a). 13. Installation according to claim 12 characterized in that each shaping channel (7a) is produced in the form of a peripheral groove (7a).
14. Installation selon la revendication 12 ou 13 caractérisée en ce que chaque canal de mise en forme (7a) comporte deux parois divergentes (7b) en vis-à-vis formant entonnoir.14. Installation according to claim 12 or 13 characterized in that each shaping channel (7a) comprises two divergent walls (7b) vis-à-vis forming a funnel.
15. Installation selon l'une quelconque des revendications 12 à 14 caractérisée en qu'elle comporte, en aval du cylindre de mise en forme (7), des moyens (14 ; 14') permettant de maintenir la section plate du fil multifilamentaire (F).15. Installation according to any one of claims 12 to 14 characterized in that it comprises, downstream of the shaping cylinder (7), means (14; 14 ') for maintaining the flat section of the multifilament yarn ( F).
16. Installation selon la revendication 15, caractérisée en ce qu'elle comporte, après le bain de coagulation (6), au moins une unité de lavage (T2), et un rouleau de transfert (RT1) permettant de transférer le fil multifilamentaire (F) entre le bain de coagulation (6) et l'unité de lavage (T2), et en ce qu'elle comporte des moyens (14 ) permettant de maintenir la section plate du fil multifilamentaire (F) et positionnés entre le cylindre de mise en forme (7) et le rouleau de transfert (RT1). 16. Installation according to claim 15, characterized in that it comprises, after the coagulation bath (6), at least one washing unit (T2), and a transfer roller (RT1) making it possible to transfer the multifilament yarn ( F) between the coagulation bath (6) and the washing unit (T2), and in that it comprises means (14) making it possible to maintain the flat section of the multifilament yarn (F) and positioned between the cylinder shaping (7) and the transfer roller (RT1).
17. Installation selon la revendication 16 caractérisé en ce qu'elle comporte des moyens (14') permettant de maintenir la section plate du fil multifilamentaire (F) et positionnés entre le rouleau de transfert (RT1) et l'unité de lavage (T1).17. Installation according to claim 16 characterized in that it comprises means (14 ') for maintaining the flat section of the multifilament wire (F) and positioned between the transfer roller (RT1) and the washing unit (T1 ).
18. Installation selon l'une quelconque des revendications 15 à 17 caractérisée en ce qu'elle comporte plusieurs unité de lavage successives (T2,...Tn), un rouleau de transfert (RT2, RT3,...) entre chaque unité de lavage, et des moyens (14') permettant de maintenir la section plate du fil multifilamentaire (F) et positionnés sur le trajet du fil multifilamentaire entre chaque rouleau de transfert (RT2, RT3, ... ) et chaque unité de lavage (T2, T3, ... ).18. Installation according to any one of claims 15 to 17 characterized in that it comprises several successive washing units (T2, ... Tn), a transfer roller (RT2, RT3, ...) between each unit washing machine, and means (14 ') for maintaining the flat section of the multifilament yarn (F) and positioned on the path of the multifilament yarn between each transfer roller (RT2, RT3, ...) and each washing unit ( T2, T3, ...).
19. Installation selon l'une quelconque des revendications 12 à 18 caractérisée en ce qu'elle comporte, en sortie de filières d'extrusion (5a), des moyens de pré-aplatissement des filaments immergés dans le bain de coagulation (6) . 19. Installation according to any one of claims 12 to 18 characterized in that it comprises, at the outlet of extrusion dies (5a), means for pre-flattening the filaments immersed in the coagulation bath (6).
20. Installation selon l'une quelconque des revendications 12 à 19 caractérisée en ce qu'elle comporte des moyens (1, 2, 3, 4) permettant d'alimenter des filière d'extrusion (5a) avec du polyuréthane. 20. Installation according to any one of claims 12 to 19 characterized in that it comprises means (1, 2, 3, 4) allowing the extrusion die (5a) to be supplied with polyurethane.
21. Fil élastomère mutifilamentaire obtenu en mettant en œuvre le procédé visé à l'une quelconque des revendications 1 à 11. 21. Mutifilamentary elastomeric thread obtained by implementing the process referred to in any one of claims 1 to 11.
22. Fil selon la revendication 21 caractérisé en ce qu'il présente un titrage au moins égal à 600 dtex, et de préférence supérieur ou égal à 1300 dtex. 22. Wire according to claim 21 characterized in that it has a titration at least equal to 600 dtex, and preferably greater than or equal to 1300 dtex.
23. Fil selon la revendication 21 ou 22 caractérisé en ce qu'il présente une largeur (L) au moins égale à 1 mm. 23. Wire according to claim 21 or 22 characterized in that it has a width (L) at least equal to 1 mm.
24. Fil selon l'une quelconque des revendications 21 à 23 caractérisé en ce qu'il est composé de filaments en polyuréthane. 24. A wire according to any one of claims 21 to 23 characterized in that it is composed of polyurethane filaments.
25. Fil selon l'une quelconque des revendications 21 à 24 caractérisé en ce qu'il est composé d'au moins 40 filaments (f), et de préférence d'au moins 300 filaments présentant un diamètre inférieur ou égal à 0,15 mm, et de préférence inférieur ou égale à 0,13mm. 25. A wire according to any one of claims 21 to 24 characterized in that it is composed of at least 40 filaments (f), and preferably at least 300 filaments having a diameter less than or equal to 0.15 mm, and preferably less than or equal to 0.13mm.
EP04790409A 2003-10-15 2004-10-14 Method and installation for producing a flat multifilament elastomer thread Expired - Fee Related EP1673495B1 (en)

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FR0312021A FR2861091B1 (en) 2003-10-15 2003-10-15 FLAT MULTIFILAMENTAL ELASTOMERIC WIRE, METHOD AND INSTALLATION FOR THE PRODUCTION THEREOF
PCT/EP2004/011553 WO2005035842A1 (en) 2003-10-15 2004-10-14 Method and installation for producing a flat multifilament elastomer thread

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EP1673495B1 EP1673495B1 (en) 2009-12-09

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BR112018073755A2 (en) 2016-05-20 2019-08-20 A&At Uk Ltd non-round spun spun filaments and methods and devices for producing them
CN109735984B (en) * 2019-02-21 2024-01-02 连云港纶洋单丝科技有限公司 Preparation method and production device of high-strength coated fishing line

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US5007193A (en) * 1990-01-17 1991-04-16 E. I. Du Pont De Nemours And Company Fishing lure with improved elastomeric skirt
US6248197B1 (en) * 1996-07-02 2001-06-19 E. I. Du Pont De Nemours And Company Method for producing a shaped multifilament, non-thermoplastic, elastomeric yarn
DE19829164A1 (en) * 1998-06-30 2000-03-30 Bayer Faser Gmbh Elastane threads and process for their manufacture

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DE602004024556D1 (en) 2010-01-21

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