EP0500480B1 - Heat set plied yarn made from synthetic monofilaments - Google Patents

Heat set plied yarn made from synthetic monofilaments Download PDF

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Publication number
EP0500480B1
EP0500480B1 EP92420053A EP92420053A EP0500480B1 EP 0500480 B1 EP0500480 B1 EP 0500480B1 EP 92420053 A EP92420053 A EP 92420053A EP 92420053 A EP92420053 A EP 92420053A EP 0500480 B1 EP0500480 B1 EP 0500480B1
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EP
European Patent Office
Prior art keywords
monofilaments
twist
synthetic material
twisting
twist yarn
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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.)
Expired - Lifetime
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EP92420053A
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German (de)
French (fr)
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EP0500480A1 (en
Inventor
Gérard Lagarrigue
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Rhone Poulenc Fibres SA
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Rhone Poulenc Fibres SA
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Classifications

    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/26—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre with characteristics dependent on the amount or direction of twist
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/40—Yarns in which fibres are united by adhesives; Impregnated yarns or threads
    • D02G3/402—Yarns in which fibres are united by adhesives; Impregnated yarns or threads the adhesive being one component of the yarn, i.e. thermoplastic yarn
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/447—Yarns or threads for specific use in general industrial applications, e.g. as filters or reinforcement
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S57/00—Textiles: spinning, twisting, and twining
    • Y10S57/902—Reinforcing or tire cords

Definitions

  • the present invention relates to a twist according to the preamble of claim 1 and to a method of manufacturing said twist according to the preamble of claim 6.
  • Such a twist and such a method are known from GB-A-2 051 165.
  • a monofilament is by definition a continuous thread made up of a single filament. It is generally used as it is, for example, as a horsehair or a brush, in textile applications such as weaving or knitting of technical fabrics or knits, in the paper industry for example as felt loops at the junction of a machine. paper, etc. It can also be used in the form of cords in textile applications such as weaving or knitting of technical fabrics or knits (for example wet felt needling base), in elastomer reinforcement applications (for example tire reinforcement) etc ...
  • a cable is defined as the product resulting from the assembly and twisting of two or more twists of monofilaments; the twist being defined as the product, hitherto an intermediate product, resulting from the assembly and twisting of two or more monofilaments.
  • the intermediate ply may consist of a single filament to which a twist has been applied.
  • the manufacture of a monofilament cable requires several successive operations, in particular the assembly and twisting in one direction (S for example) of the monofilaments then the assembly and twisting in the opposite direction (Z in this case) of several twists , which gives the cable.
  • the opposite twists for the twisted and the cabled are intended to create a mechanical blocking of the cabled by opposition and balancing of the untwisting forces.
  • this mechanical blockage leaves the cable a certain nervousness; there is a twisting of the cable in the free state, which hinders its transformation for example into fabrics or knits.
  • British Patent No. 2,051,165 describes the manufacture of a ply comprising fibers sandwiched between the twists of the filaments constituting the ply.
  • One of the filaments is a preoriented filament.
  • the twist is obtained by successive twists of the filaments in two opposite directions. This process also involves two twisting steps for the manufacture of a plied.
  • the present invention aims to provide a solution to the above problems.
  • a twisted monofilament for applications such as use of technical texts, reinforcements of elastomers, paper industry, etc., consisting of at least two monofilaments of synthetic material characterized in that the title of these monofilaments is at least equal to 20 tex, assembled, twisted in one direction and heat-fixed, and has a twist of less than two turns per meter.
  • the synthetic materials which are suitable are all those usually used in the manufacture of monofilaments and in particular polyesters and polyamides in the form of homopolymers, copolymers or mixtures of polymers, where appropriate.
  • the number of monofilaments is not limited, it depends on the characteristics desired for the product produced. However in general this number is between two and nine.
  • each monofilament depends on the use for which the twist is intended.
  • the titer is preferably between 20 and 500 tex.
  • the twisting twist takes the current values in this type of operation, which are to a large extent a function of the unit titer and the number of unit monofilaments.
  • the ply is thermofixed under the conditions defined in the manufacturing process claimed below.
  • the starting monofilaments are produced according to a conventional spinning, stretching in several phases, relaxation process; however, the relaxation rate is lower than that usually practiced.
  • the relaxation rate is advantageously between 0% and 6% instead of 0% to 12%, values usually practiced.
  • the dynamometric characteristics are those common for this type of product and depend on the material.
  • the elongation at break of the starting monofilaments is advantageously between 10% and 20%. Given the rate of relaxation the material is in a moderately relaxed state, slightly repelotected macromolecules.
  • the assembly of two or more strands is carried out in a known manner continuously; discontinuous it will be necessary to take the necessary precautions to obtain an assembly with regular thread tension and calculated so as not to generate a winding or twisting fault.
  • Twisting will be done from these monofilaments assembled in a single operation on an appropriate machine.
  • the assembly is placed, for example, in a single or double twist twisting pot where it receives the desired twist.
  • the assembly is subjected to a tensile stress greater than the elastic limit stress, therefore it undergoes a slight deformation comparable to a further stretching with however the molecules oriented in the direction of the plied .
  • the product remains very nervous because it is subjected to an internal stress of detorsion.
  • the fixing zone includes a heat treatment oven and it is advantageously delimited by two capstans: an entry capstan (which also marks the exit from the twisting zone) calling the plies at constant speed while keeping torsion blocked, a exit capstan rotating at a speed lower than the entry speed, thus allowing the plying to be relaxed.
  • the heat treatment at a temperature higher than the thermal past of the material, with the possibility of relaxation will fix the said material by repelotonnage of the molecular chains with the internal orientation acquired during the twisting, giving the product a stability making it lose most, if not all. , his nervousness.
  • the reception of the twisted is done for example on a parallel cross coil.
  • an additional step of surface treatment for example coating, is integrated between twisting and fixing. For this it is necessary to keep the twisted blocked during this operation which can be achieved by means of an additional capstan.
  • the process is carried out at the usual wiring speeds, that is to say generally between 20 and 50 m / min approximately.
  • the method is economically advantageous in that it allows the elimination of a twisting step.
  • it allows the continuous integration of an additional step such as coating, which until now was carried out discontinuously and required a cable recovery.
  • the standard wired control product that the twist according to the invention proposes to replace is produced from shrinked polyamide 66 monofilaments, according to the procedure described below.
  • the monofilaments obtained have the following characteristics: - title 60.5 tex - average diameter 0.26mm - average linear breaking strength 3.0 daN - elongation at break (medium) 28% - removal with boiling water (medium 2.0% - medium toughness 50 CN / tex
  • the cable obtained has the following characteristics: - title 195 tex - Tear resistant 7.4 daN - tenacity 38 CN / tex - boiling water removal 1.6% - twisting 10 turns / m
  • Twist is measured by the method described in French Standard G07 314, it corresponds to the number of loops formed after having unrolled 1 meter of cable or twists and joined the ends.
  • This cable can be used in applications such as a base for stationery felts and in some cases as a weft on the loom to form the felt joining loop, this loop then being in the direction of operation on a paper machine.
  • a twist according to the invention is then produced for comparison.
  • the monofilaments are manufactured by the same process as the control with the same parameters, except for the relaxation rate which is 6% instead of 12% and the assembly by three in this case.
  • Monofilaments have the following characteristics: - title 60.5 tex - average diameter 0.26mm - average linear breaking strength 3.0 daN - elongation at break (medium) 21% - removal with boiling water (medium) 8.0% - medium toughness 50 CN / tex
  • a twist according to the invention is produced by the method according to the invention.
  • a modified twister is used for the implementation of the method, it comprises in particular, a thermal fixing oven, a first call capstan located upstream of the oven (exit from the twisting area) and a second capstan located downstream from the oven (leaving the fixing area).
  • the spool of triwires is placed in the twisting pot of the machine where the assembly receives a S240 twist. Twisting is carried out with the application of a tension of 400 CN, ie a stress of 2.2 CN / tex, greater than the elastic limit stress. Continuously, twist kept blocked by the capstans, the plied is subjected to a thermal fixing by passage in the oven at the temperature of 200 ° C, higher than the thermal past of the material, with application of a relaxation rate of 8% .
  • the speed of the upstream capstan is 21.6 m / min, that of the downstream capstan 20 m / min, that is to say identical to that of production of the control cable, hence no loss of productivity.
  • the twisted is received on a spool with parallel cross winding, winding weight 2 kg.
  • the plied has the following characteristics: - title 200 tex - Tear resistant 8.1 daN - tenacity 40.5 CN / tex - boiling water removal 1.6% - twisting 1 turn / m
  • the twist according to example 1 is used for the production of joining loops on felt at the junction of the paper machine, press section. This junction is made by a loop at each end of the felt favoring its mounting during its change, for this a rod is introduced between the loops, thus binding the felt.
  • thermofixed ply according to the invention replaces a 200 tex monofilament, it provides the characteristics of flexibility and longitudinal regularity in section.
  • This homogeneity of favorite section will be the characteristics sought in felts, namely dryness, compressibility.
  • the fact that this twist has a non-round section promotes blocking of the meshes when making the base.
  • the coating material is constituted by a wiping roller.
  • the product to be applied is a polymerizable silicone with rapid polymerization in the form of a liquid.
  • the heat treatment furnace is used both for thermofixing the ply (fixing the twist) and polymerizing the coating.
  • the process speed is between 20 and 50 m / min.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Artificial Filaments (AREA)
  • Paper (AREA)

Description

La présente invention concerne un retors selon le préambule de la revendication 1 et un procédé de fabrication dudit retors selon le préambule de la revendication 6. Un tel retors et un tel procédé sont connus du document GB-A-2 051 165.The present invention relates to a twist according to the preamble of claim 1 and to a method of manufacturing said twist according to the preamble of claim 6. Such a twist and such a method are known from GB-A-2 051 165.

Un monofilament est par définition un fil continu constitué d'un seul filament. Il est utilisé généralement en l'état par exemple comme crin de pêche ou crin de brosserie, dans des applications textiles telles que tissage ou tricotage de tissus ou tricots techniques, dans l'industrie papetière par exemple comme boucles de feutre à jonction de machine à papier, etc... Il peut aussi être utilisé sous forme de câblés dans des applications textiles telles que tissage ou tricotage de tissus ou tricots techniques (par exemple base d'aiguilletage de feutre humide), dans des applications de renfort d'élastomère (par exemple renfort de pneumatique) etc....A monofilament is by definition a continuous thread made up of a single filament. It is generally used as it is, for example, as a horsehair or a brush, in textile applications such as weaving or knitting of technical fabrics or knits, in the paper industry for example as felt loops at the junction of a machine. paper, etc. It can also be used in the form of cords in textile applications such as weaving or knitting of technical fabrics or knits (for example wet felt needling base), in elastomer reinforcement applications ( for example tire reinforcement) etc ...

Un câble se définit comme le produit résultant de l'assemblage et du retordage de deux ou plusieurs retors de monofilaments ; le retors se définissant comme le produit, jusqu'ici produit intermédiaire, résultant de l'assemblage et du retordage de deux ou plusieurs monofilaments. Dans certains cas le retors intermédiaire peut être constitué d'un filament unique auquel on a appliqué une torsion.A cable is defined as the product resulting from the assembly and twisting of two or more twists of monofilaments; the twist being defined as the product, hitherto an intermediate product, resulting from the assembly and twisting of two or more monofilaments. In some cases the intermediate ply may consist of a single filament to which a twist has been applied.

La fabrication d'un câble de monofilaments nécessite plusieurs opérations successives, notamment l'assemblage et le retordage dans un sens (S par exemple) des monofilaments puis l'assemblage et le retordage en sens inverse (Z en l'occurence) de plusieurs retors, ce qui donne le câblé. Les torsions de sens inverse pour le retors et le câblé sont destinées à créer un blocage mécanique du câblé par opposition et équilibrage des forces de détorsion. Néanmoins ce blocage mécanique laisse au câblé une certaine nervosité ; il se produit un vrillage du câblé à l'état libre, qui gène sa transformation par exemple en tissus ou tricots. Pour vaincre cette nervosité, il est parfois nécessaire d'appliquer des tensions importantes, ce qui conduit à travailler hors des limites élastiques de la matière, au risque de détériorer celle-ci.The manufacture of a monofilament cable requires several successive operations, in particular the assembly and twisting in one direction (S for example) of the monofilaments then the assembly and twisting in the opposite direction (Z in this case) of several twists , which gives the cable. The opposite twists for the twisted and the cabled are intended to create a mechanical blocking of the cabled by opposition and balancing of the untwisting forces. However, this mechanical blockage leaves the cable a certain nervousness; there is a twisting of the cable in the free state, which hinders its transformation for example into fabrics or knits. To overcome this nervousness, it is sometimes necessary to apply significant tensions, which leads to work outside the elastic limits of the material, at the risk of damaging it.

Sur le plan économique, la réalisation de ces câblés s'effectuant en plusieurs opérations, elle nécessite beaucoup plus de valeur ajoutée et un investissement en matériel non négligeable. D'autre part, dans le cas de câblés enduits tels que ceux utilisés pour les applications pneumatiques, papetière, tissus enduits et qui sont enduits d'une substance à base de résorcine formol, silicone ou autre produits à adhérence rapide dans le but de favoriser l'adhésion, l'écoulement ou toute autre adhérence, l'opération d'enduction nécessite actuellement une reprise des câblés dans des installations complémentaires d'où un surcroît d'investissements.On the economic level, the realization of these cables being carried out in several operations, it requires much more added value and a significant investment in equipment. On the other hand, in the case of coated cables such as those used for pneumatic, paper, coated fabrics and which are coated with a substance based on resorcinol formaldehyde, silicone or other products with rapid adhesion in order to promote adhesion, flow or any other adhesion, the coating operation currently requires a resumption of cables in additional installations where an additional investment.

Pour réduire le nombre d'opérations nécessaires à la fabrication des câblés, on pourrait envisager de les remplacer par des retors et avoir ainsi une seule étape de torsion. Cependant, dans ce cas on ne peut utiliser l'effet antagoniste des torsions inverses pour obtenir un produit relativement inerte ou du moins très peu nerveux. Il serait dans ce cas nécessaire d'appliquer une surtorsion afin de travailler au delà des limites élastiques, mais il y a alors un risque important de détérioration de la matière, ce qui fait que cette méthode ne peut être adoptée.To reduce the number of operations necessary for the manufacture of cables, it could be envisaged to replace them with twists and thus have a single twisting step. However, in this case, it is not possible to use the antagonistic effect of the reverse twists to obtain a relatively inert product or at least very little nervous. In this case it would be necessary to apply an overvoltage in order to work beyond the elastic limits, but there is then a significant risk of deterioration of the material, which means that this method cannot be adopted.

Le brevet britannique n° 2 051 165 décrit la fabrication d'un retors comprenant des fibres enserrées entre les torsions des filaments constituant le retors. Un des filaments est un filament préorienté. Le retors est obtenu par torsions successives des filaments dans deux directions inverses. Ce procédé implique également deux étapes de torsion pour la fabrication d'un retors.British Patent No. 2,051,165 describes the manufacture of a ply comprising fibers sandwiched between the twists of the filaments constituting the ply. One of the filaments is a preoriented filament. The twist is obtained by successive twists of the filaments in two opposite directions. This process also involves two twisting steps for the manufacture of a plied.

La présente invention a pour but d'apporter une solution aux problèmes ci-dessus.The present invention aims to provide a solution to the above problems.

Elle concerne un retors de monofilaments pour des applications telles qu'emplois textes techniques, renforts d'élastomères, industrie papetière, etc, constitué d'au moins deux monofilaments en matière synthétique caractérisé en ce que le titre de ces monofilaments est au moins égal à 20 tex, assemblés, retordus selon une seule direction et thermofixés, et qu'il présent un vrillage inférieur à deux tours par mètre.It relates to a twisted monofilament for applications such as use of technical texts, reinforcements of elastomers, paper industry, etc., consisting of at least two monofilaments of synthetic material characterized in that the title of these monofilaments is at least equal to 20 tex, assembled, twisted in one direction and heat-fixed, and has a twist of less than two turns per meter.

Les matières synthétiques qui conviennent sont toutes celles habituellement utilisées dans la fabrication des monofilaments et en particulier les polyesters et polyamides sous forme d'homopolymères, de copolymères ou de mélanges de polymères éventuellement.The synthetic materials which are suitable are all those usually used in the manufacture of monofilaments and in particular polyesters and polyamides in the form of homopolymers, copolymers or mixtures of polymers, where appropriate.

Le nombre de monofilaments n'est pas limité, il est fonction des caractéristiques désirées pour le produit fabriqué. Cependant d'une façon générale ce nombre est compris entre deux et neuf.The number of monofilaments is not limited, it depends on the characteristics desired for the product produced. However in general this number is between two and nine.

Le titre de chaque monofilament dépend de l'emploi auquel le retors est destiné. Cependant le titre est de préférence compris entre 20 et 500 tex.The title of each monofilament depends on the use for which the twist is intended. However, the titer is preferably between 20 and 500 tex.

La torsion de retordage prend les valeurs courantes dans ce type d'opération, lesquelles sont dans une large mesure fonction du titre unitaire et du nombre de monofilaments unitaires.The twisting twist takes the current values in this type of operation, which are to a large extent a function of the unit titer and the number of unit monofilaments.

Le retors est thermofixé dans les conditions définies dans le procédé de fabrication revendiqué ci-après.The ply is thermofixed under the conditions defined in the manufacturing process claimed below.

Exempt de contraintes internes, le retors obtenu ayant subit des modifications d'orientation lors de la thermofixation ne présentera aucune détorsion ou séparation des brins entre eux lorsqu'il sera soumis à cisaillement ou pression.Free from internal stresses, the ply obtained having undergone changes in orientation during the heat setting will not show any twisting or separation of the strands between them when it is subjected to shear or pressure.

La présente invention concerne également un procédé de fabrication du retors ci-dessus. Il s'agit d'un procédé pour la fabrication d'un retors de monofilaments, thermofixé et pratiquement exempt de contrainte de détorsion c'est-à-dire présentant un vrillage inférieur à deux tours par mètre, caractérisé par les étapes suivantes :

  • assemblage d'au moins deux monofilaments en matière synthétique, orientés et peu ou pas relaxés,
  • retordage de l'assemblé à la valeur désirée sous application d'une contrainte de tension supérieure à la contrainte limite d'élasticité,
  • fixation thermique de la torsion maintenue bloquée et simultanément relaxation du retors, la température de fixation étant supérieure au passé thermique de la matière,
  • réception du retors fixé et relaxé sur tout support approprié.
The present invention also relates to a method for manufacturing the above twist. It is a process for the manufacture of a twisted monofilament, thermofixed and practically free of twisting stress, that is to say having a twist of less than two turns per meter, characterized by the following steps:
  • assembly of at least two monofilaments of synthetic material, oriented and little or not relaxed,
  • twisting of the assembly to the desired value under application of a tensile stress greater than the elastic limit stress,
  • thermal fixing of the torsion kept blocked and simultaneous relaxation of the twist, the fixing temperature being higher than the thermal past of the material,
  • reception of the twisted set and relaxed on any appropriate support

Les monofilaments de départ sont fabriqués selon un procédé classique filage, étirage en plusieurs phases, relaxation ; le taux de relaxation étant cependant plus faible que celui habituellement pratiqué. Ainsi, lorsque les monofilaments sont à base de polyamide le taux de relaxation est avantageusement compris entre 0 % et 6 % au lieu de 0 % à 12 %, valeurs habituellement pratiquées. Les caractéristiques dynamométriques sont celles courantes pour ce type de produit et dépendent de la matière. Pour le polyamide 66 l'allongement à la rupture des monofilaments de départ est avantageusement compris entre 10 % et 20 %. Vu le taux de relaxation la matière est à l'état modérément relaxé, macromolécules légèrement repelotonnées.The starting monofilaments are produced according to a conventional spinning, stretching in several phases, relaxation process; however, the relaxation rate is lower than that usually practiced. Thus, when the monofilaments are based on polyamide, the relaxation rate is advantageously between 0% and 6% instead of 0% to 12%, values usually practiced. The dynamometric characteristics are those common for this type of product and depend on the material. For polyamide 66, the elongation at break of the starting monofilaments is advantageously between 10% and 20%. Given the rate of relaxation the material is in a moderately relaxed state, slightly repelotected macromolecules.

L'assemblage de deux ou plusieurs brins s'effectue de façon connue en continu ; en discontinu il faudra prendre les précautions nécessaires pour obtenir un assemblage à tension de fil régulière et calculée de façon à ne pas générer de défaut de bobinage ou retordage.The assembly of two or more strands is carried out in a known manner continuously; discontinuous it will be necessary to take the necessary precautions to obtain an assembly with regular thread tension and calculated so as not to generate a winding or twisting fault.

Le retordage s'effectuera à partir de ces monofilaments assemblés en une seule opération sur une machine appropriée.Twisting will be done from these monofilaments assembled in a single operation on an appropriate machine.

Pour l'étape retordage l'assemblé est placé par exemple dans un pot de retordage simple ou double torsion où il reçoit la torsion désirée.For the twisting step, the assembly is placed, for example, in a single or double twist twisting pot where it receives the desired twist.

Au cours de cette opération l'assemblé est soumis à une contrainte de tension supérieure à la contrainte de limite d'élasticité, de ce fait il subit une légère déformation assimilable à un complément d'étirage avec cependant les molécules orientées dans le sens du retors. A ce niveau le produit demeure très nerveux car il est soumis à une contrainte interne de détorsion.During this operation the assembly is subjected to a tensile stress greater than the elastic limit stress, therefore it undergoes a slight deformation comparable to a further stretching with however the molecules oriented in the direction of the plied . At this level the product remains very nervous because it is subjected to an internal stress of detorsion.

Afin d'éviter la détorsion il est prévu de bloquer la torsion dès la sortie de la zone de retordage et pendant toute l'étape de fixation thermique qui a lieu dans une zone de fixation faisant suite à la zone de retordage. La zone de fixation comporte un four de traitement thermique et elle est délimitée avantageusement par deux cabestans : un cabestan d'entrée (qui marque également la sortie de la zone de retordage) appelant le retors à vitesse constante tout en maintenant bloquée la torsion, un cabestan de sortie tournant à une vitesse inférieure à la vitesse d'entrée, permettant ainsi la relaxation du retors. Le traitement thermique à température supérieure au passé thermique de la matière, avec possibilité de relaxation va fixer ladite matière par repelotonnement des chaines moléculaires avec l'orientation interne acquise au retordage conférant au produit une stabilité lui faisant perdre la plus grande partie, voire la totalité, de sa nervosité.In order to avoid untwisting, provision is made to block the torsion as soon as it leaves the twisting zone and during the entire thermal fixing step which takes place in a fixing zone following the twisting zone. The fixing zone includes a heat treatment oven and it is advantageously delimited by two capstans: an entry capstan (which also marks the exit from the twisting zone) calling the plies at constant speed while keeping torsion blocked, a exit capstan rotating at a speed lower than the entry speed, thus allowing the plying to be relaxed. The heat treatment at a temperature higher than the thermal past of the material, with the possibility of relaxation will fix the said material by repelotonnage of the molecular chains with the internal orientation acquired during the twisting, giving the product a stability making it lose most, if not all. , his nervousness.

La réception du retors se fait par exemple sur une bobine à croisure parallèle.The reception of the twisted is done for example on a parallel cross coil.

Selon une variante de l'invention on intègre une étape supplémentaire de traitement de surface, par exemple enduction, entre le retordage et la fixation. Pour celà il est nécessaire de maintenir bloqué le retors durant cette opération ce qui peut être réalisé au moyen d'un cabestan supplémentaire.According to a variant of the invention, an additional step of surface treatment, for example coating, is integrated between twisting and fixing. For this it is necessary to keep the twisted blocked during this operation which can be achieved by means of an additional capstan.

Le procédé est mis en oeuvre aux vitesses habituelles de câblage c'est-à-dire généralement entre 20 et 50 m/min environ.The process is carried out at the usual wiring speeds, that is to say generally between 20 and 50 m / min approximately.

Le retors selon l'invention susceptible de remplacer des câbles ou dans certains cas des monofilaments employés isolement présente de nombreux avantages :

  • propriétés mécaniques équivalentes voire supérieures à celles d'un câble de même titre,
  • plus grande régularité géométrique en particulier absence de l'effet noueux que l'on trouve sur le câble,
  • plus grande souplesse qu'un monofilament ou qu'un câble de même titre,
  • vrillage très faible, voire nul, produit plus inerte.
The twist according to the invention capable of replacing cables or in some cases monofilaments used in isolation has many advantages:
  • mechanical properties equivalent to or even superior to those of a cable of the same grade,
  • greater geometric regularity, in particular the absence of the knotty effect found on the cable,
  • more flexibility than a monofilament or a cable of the same title,
  • very weak twisting, even zero, more inert product.

Le procédé est avantageux économiquement par le fait qu'il permet la suppression d'une étape de retordage. En outre, lorsqu'on le désire il permet l'intégration en continu d'une étape supplémentaire telle qu'enduction, qui jusqu'ici s'effectuait en discontinu et nécessitait une reprise du câble.The method is economically advantageous in that it allows the elimination of a twisting step. In addition, when desired it allows the continuous integration of an additional step such as coating, which until now was carried out discontinuously and required a cable recovery.

Le retors selon la présente invention trouve de nombreux emplois, d'une façon générale il est utilisé pour toute application textile industrielle nécessitant la présence de câble ou de retors de titre supérieur à 20 tex, par exemple :

  • tissu technique nécessitant une stabilité dimensionnelle, le retors étant ou non enduit,
  • applications pneumatiques, avec retors enduit,
  • feutres de jonction pour tapis de machine à papier. Dans cette application, le retors de l'invention permet un bon positionnement du feutre autour du jonc de jonction pendant le tissage grâce à ses caractéristiques de souplesse comparable au câblé et sa régularité de section comparable à un monofilament nécessitant une bonne stabilité du retors,
  • toile de formation en papeterie par substitution des monofilaments,
  • support pour bâche,
  • tricotage, tressage, ou autres opérations textiles.
The plied according to the present invention finds many uses, in general it is used for any industrial textile application requiring the presence of cable or plied with a title greater than 20 tex, for example:
  • technical fabric requiring dimensional stability, the ply being or not coated,
  • pneumatic applications, with plied plies,
  • junction felts for paper machine mats. In this application, the twist of the invention allows good positioning of the felt around the junction rod during weaving thanks to its characteristics of flexibility comparable to cord and its regularity of section comparable to a monofilament requiring good stability of the twist,
  • training cloth in stationery by replacing monofilaments,
  • tarpaulin support,
  • knitting, braiding, or other textile operations.

Mais l'invention sera mieux comprise à l'aide des exemples ci-après, donnés à titre illustratif et non limitatif.However, the invention will be better understood with the aid of the examples below, given by way of illustration and not limitation.

Exemple 1Example 1

Le produit témoin, câblé courant, que le retors selon l'invention se propose de remplacer, est fabriqué à partir de monofilaments de polyamide 66 rétractés, selon le mode opératoire décrit ci-après.The standard wired control product that the twist according to the invention proposes to replace is produced from shrinked polyamide 66 monofilaments, according to the procedure described below.

On extrude un polyamide 66 de point de fusion 256°C d'indice de viscosité (IV) de 126 mesuré selon la norme internationale ISO 307-1977, dans les conditions suivantes : - filière 56 trous - diamètre des capillaires 0,80 mm - débit total 40 kg/h - température d'extrusion et de filage 280°C A polyamide 66 with a melting point 256 ° C. of a viscosity index (IV) of 126, measured according to international standard ISO 307-1977, is extruded under the following conditions: - Faculty 56 holes - capillary diameter 0.80 mm - total flow 40 kg / h - extrusion and spinning temperature 280 ° C

Après extrusion les monofilaments sont refroidis dans de l'eau à 35°C, puis subissent une série de trois phases d'étirage à chaud :After extrusion the monofilaments are cooled in water to 35 ° C, then undergo a series of three phases of hot drawing:

1er étirage :1st stretch:

  • taux d'étirage : 3,6stretch rate: 3.6
  • température d'étirage
    (par passage dans un bas à eau) : 95°C    stretching temperature
    (by passage through a water tank): 95 ° C
2ème étirage :2nd stretch:

  • taux d'étirage cumulé : 4,5
  • température d'étirage
    (par passage dans un four à chaud) : 160°C

   Après étirage les monofilaments sont soumis à une relaxation et à une fixation thermique, taux de relaxation 12 %, température de fixation 215°C (passage dans un four à air chaud). Les monofilaments sont finalement bobinés, vitesse de renvidage : 180 m/min, poids des enroulements : 2 kg.
  • cumulative stretch rate: 4.5
  • stretching temperature
    (by passing through a hot oven): 160 ° C

After stretching, the monofilaments are subjected to relaxation and to thermal fixation, relaxation rate 12%, fixing temperature 215 ° C. (passage through a hot air oven). The monofilaments are finally wound, winding speed: 180 m / min, weight of the windings: 2 kg.

Les monofilaments obtenus présentent les caractéristiques suivantes : - titre 60,5 tex - diamètre moyen 0,26 mm - résistance à la rupture linéaire moyenne 3,0 daN - allongement à la rupture (moyen) 28 % - retrait à l'eau bouillante (moyen 2,0 % - ténacité moyenne 50 CN/tex The monofilaments obtained have the following characteristics: - title 60.5 tex - average diameter 0.26mm - average linear breaking strength 3.0 daN - elongation at break (medium) 28% - removal with boiling water (medium 2.0% - medium toughness 50 CN / tex

Trois de ces monofilaments sont câblés pour former un produit de 0,46 mm de diamètre environ, il s'agit d'un câblage 1 brin x 3 brins, chaque brin uni taire ayant subi une torsion primaire Z240 t/m puis les trois brins sont assemblés et l'ensemble câblé par une torsion inverse S250 t/m. Le câble obtenu présente les caractéristiques suivantes : - titre 195 tex - résistance à la rupture 7,4 daN - ténacité 38 CN/tex - retrait eau bouillante 1,6 % - vrillage 10 tours/m Three of these monofilaments are wired to form a product of about 0.46 mm in diameter, it is a 1-strand x 3-strand wiring, each single strand having undergone a primary twist Z240 rpm then the three strands are assembled and the assembly wired by a reverse twist S250 rpm. The cable obtained has the following characteristics: - title 195 tex - Tear resistant 7.4 daN - tenacity 38 CN / tex - boiling water removal 1.6% - twisting 10 turns / m

Le vrillage est mesuré par la méthode décrite dans la Norme française G07 314, il correspond au nombre de boucles formées après avoir déroulé 1 mètre de câble ou retors et rejoint les extrémités.Twist is measured by the method described in French Standard G07 314, it corresponds to the number of loops formed after having unrolled 1 meter of cable or twists and joined the ends.

Ce câblé est utilisable dans des applications telles que base pour feutres de papeterie et dans certains cas comme trame sur métier pour former la boucle de jonction du feutre, cette boucle se trouvant ensuite dans le sens de marche sur machine à papier.This cable can be used in applications such as a base for stationery felts and in some cases as a weft on the loom to form the felt joining loop, this loop then being in the direction of operation on a paper machine.

On réalise ensuite à titre de comparaison un retors selon l'invention.A twist according to the invention is then produced for comparison.

Les monofilaments sont fabriqués par le même procédé que le témoin avec les mêmes paramètres, hormis le taux de relaxation qui est de 6 % au lieu de 12 % et l'assemblage par trois dans ce cas.The monofilaments are manufactured by the same process as the control with the same parameters, except for the relaxation rate which is 6% instead of 12% and the assembly by three in this case.

Les monofilaments présentent les caractéristiques suivantes : - titre 60,5 tex - diamètre moyen 0,26 mm - résistance à la rupture linéaire moyenne 3,0 daN - allongement à la rupture (moyen) 21 % - retrait à l'eau bouillante (moyen) 8,0 % - ténacité moyenne 50 CN/tex Monofilaments have the following characteristics: - title 60.5 tex - average diameter 0.26mm - average linear breaking strength 3.0 daN - elongation at break (medium) 21% - removal with boiling water (medium) 8.0% - medium toughness 50 CN / tex

A partir du trifils tel que ci-dessus on fabrique, par le procédé selon l'invention, un retors selon l'invention.From the three-wire thread as above, a twist according to the invention is produced by the method according to the invention.

On utilise une retordeuse modifiée pour la mise en oeuvre du procédé, elle comporte en particulier, un four de fixation thermique, un premier cabestan d'appel situé en amont du four (sortie de la zone de retordage) et un deuxième cabestan situé en aval du four (sortie de la zone de fixation).A modified twister is used for the implementation of the method, it comprises in particular, a thermal fixing oven, a first call capstan located upstream of the oven (exit from the twisting area) and a second capstan located downstream from the oven (leaving the fixing area).

La bobine de trifils est disposée dans le pot de retordage de la machine où l'assemblé reçoit une torsion S240. Le retordage s'effectue avec application d'une tension de 400 CN soit une contrainte de 2,2 CN/tex, supérieure à la contrainte limite d'élasticité. En continu, torsion maintenue bloquée par les cabestans, le retors est soumis à une fixation thermique par passage dans le four à la température de 200°C, supérieure au passé thermique de la matière, avec application d'un taux de relaxation de 8 %. La vitesse du cabestan amont est de 21,6 m/min, celle du cabestan aval de 20 m/min, c'est-à-dire identique à celle de production du câblé témoin, d'où pas de perte de productivité.The spool of triwires is placed in the twisting pot of the machine where the assembly receives a S240 twist. Twisting is carried out with the application of a tension of 400 CN, ie a stress of 2.2 CN / tex, greater than the elastic limit stress. Continuously, twist kept blocked by the capstans, the plied is subjected to a thermal fixing by passage in the oven at the temperature of 200 ° C, higher than the thermal past of the material, with application of a relaxation rate of 8% . The speed of the upstream capstan is 21.6 m / min, that of the downstream capstan 20 m / min, that is to say identical to that of production of the control cable, hence no loss of productivity.

Le retors est reçu sur une bobine avec enroulement à croisure parallèle, poids de l'enroulement 2 kg. Le retors présente les caractéristiques suivantes : - titre 200 tex - résistance à la rupture 8,1 daN - ténacité 40,5 CN/tex - retrait eau bouillante 1,6 % - vrillage 1 tour/m The twisted is received on a spool with parallel cross winding, winding weight 2 kg. The plied has the following characteristics: - title 200 tex - Tear resistant 8.1 daN - tenacity 40.5 CN / tex - boiling water removal 1.6% - twisting 1 turn / m

On remarque que les caractéristiques dynamométriques du retors sont pratiquement identiques (légèrement supérieures) à celles du câblé témoin. Par contre sa nervosité est nettement diminuée : vrillage 1 tour/mètre au lieu de 10 tours/mètre, ce qui représente une importante amélioration. Le retors remplace avantageusement le câblé témoin dans les applications citées, de plus son procédé de fabrication plus court, puisqu'il n'y a pas l'étape d'application de la torsion primaire, apporte un gain économique non négligeable.We note that the dynamometric characteristics of the plied are practically identical (slightly better) than those of the control cable. On the other hand, its nervousness is clearly reduced: twisting 1 turn / meter instead of 10 turns / meter, which represents a significant improvement. The plied advantageously replaces the control cable in the applications mentioned, moreover its shorter manufacturing process, since there is no step of applying the primary twist, brings a significant economic gain.

Exemple 2Example 2

Le retors selon l'exemple 1 est utilisé pour la réalisation de boucles de jonction sur feutre à jonction de machine à papier, section presse. Cette jonction est réalisé par une boucle à chaque extrémité du feutre favorisant son montage lors de son changement, pour cela un jonc est introduit entre les boucles, liant ainsi le feutre.The twist according to example 1 is used for the production of joining loops on felt at the junction of the paper machine, press section. This junction is made by a loop at each end of the felt favoring its mounting during its change, for this a rod is introduced between the loops, thus binding the felt.

De façon courante ces boucles sont réalisées en monofilament. Cependant le monofilament est un produit rigide qui a tendance à s'incliner lors de la mise en forme de la boucle. Ces câbles sont des produits beaucoup trop nerveux et présentent beaucoup de difficultés dans cette application.These loops are commonly made of monofilament. However, monofilament is a rigid product which tends to tilt when shaping the loop. These cables are much too nervous products and present many difficulties in this application.

Le retors thermofixé selon l'invention, remplace un monofilament de titre 200 tex, il apporte les caractéristiques de souplesse et de régularité longitudinale de section.The thermofixed ply according to the invention replaces a 200 tex monofilament, it provides the characteristics of flexibility and longitudinal regularity in section.

Cette homogénéité de section favori sera les caractéristiques recherchées dans les feutres à savoir siccité, compressibilité. Le fait que ce retors présente une section non ronde favorise le blocage des mailles lors de la confection de la base.This homogeneity of favorite section will be the characteristics sought in felts, namely dryness, compressibility. The fact that this twist has a non-round section promotes blocking of the meshes when making the base.

Exemple 3Example 3

Il concerne la réalisation d'un retors enduit utilisable dans des applications telles que tissu technique anti-salissure.It relates to the production of a coated twist usable in applications such as anti-fouling technical fabric.

Il est réalisé dans les mêmes conditions que celles décrites dans l'exemple 1, mais avec introduction d'une étape d'enduction entre le retordage et la fixation thermique. Le matériel d'enduction est constitué par un rouleau lécheur.It is carried out under the same conditions as those described in Example 1, but with the introduction of a coating step between the twisting and the thermal fixing. The coating material is constituted by a wiping roller.

Le produit à appliquer est une silicone polymérisable à polymérisation rapide se présentant sous la forme d'un liquide.The product to be applied is a polymerizable silicone with rapid polymerization in the form of a liquid.

Le four de traitement thermique est utilisé à la fois pour la thermofixation du retors (fixation de la torsion) et la polymérisation de l'enduction.The heat treatment furnace is used both for thermofixing the ply (fixing the twist) and polymerizing the coating.

La vitesse du procédé est comprise entre 20 et 50 m/min.The process speed is between 20 and 50 m / min.

Claims (11)

  1. Twist yarn of monofilaments for applications such as uses as special textiles, uses as elastomeric reinforcements, uses in the papermaking industry, etc., consisting of at least two monofilaments made from synthetic material, characterized in that the count of these monofilaments is at least equal to 20 tex when they are combined, twisted in a single direction and heat-set, and in that it has a twist of less than 2 turns per metre.
  2. Twist yarn according to Claim 1, characterized in that the synthetic material is a polyester-based synthetic material.
  3. Twist yarn according to one of Claims 1 or 2, characterized in that the synthetic material is a polyamide-based synthetic material.
  4. Twist yarn according to Claim 3, characterized in that the synthetic material is nylon-6,6.
  5. Twist yarn according to Claim 3, characterized in that the synthetic material is a nylon-6,6/nylon-6 copolymer.
  6. Process for the manufacture of a twist yarn of monofilaments according to Claims 1 to 5, heat-set and having a twist of less than 2 turns per metre, characterized by the following steps:
    - combining at least two monofilaments made from synthetic material, these being oriented and slightly relaxed or unrelaxed,
    - twisting the combination to the desired value under the application of a tensile stress greater than the elastic limit stress,
    - heat-setting the twist held locked on, and simultaneously, relaxation of the twist yarn, the setting temperature being greater than the heat history of the material,
    - receiving the set and relaxed twist yarn on any appropriate support.
  7. Process according to Claim 6, characterized in that the starting monofilaments are polyamide-based monofilaments and are obtained by spinning, drawing, relaxation with an amount of relaxation of between 2% and 8%.
  8. Process according to one of Claims 6 or 7, characterized in that the twisting and heat-setting is performed continuously by passing into consecutive zones on an appropriate machine.
  9. Process according to one of Claims 6 to 8, characterized in that the locking of the twist during the setting step is carried out by two take-up capstans located respectively at the input and at the output of the setting zone.
  10. Process according to one of Claims 6 to 9, characterized in that an additional surface-treatment step is incorporated between the twisting and setting steps.
  11. Process according to Claim 10, characterized in that the surface treatment is a coating operation.
EP92420053A 1991-02-21 1992-02-18 Heat set plied yarn made from synthetic monofilaments Expired - Lifetime EP0500480B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9102309A FR2673202B1 (en) 1991-02-21 1991-02-21 THERMOFIXED TWISTS IN SYNTHETIC MONOFILAMENTS.
FR9102309 1991-02-21

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EP0500480A1 EP0500480A1 (en) 1992-08-26
EP0500480B1 true EP0500480B1 (en) 1994-12-28

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EP (1) EP0500480B1 (en)
CA (1) CA2061428A1 (en)
DE (1) DE69200975T2 (en)
FI (1) FI95288C (en)
FR (1) FR2673202B1 (en)

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CN100478509C (en) * 2001-12-05 2009-04-15 休闲生活世界股份有限公司 Method for making furniture by using synthesized weaving material
US20040031534A1 (en) * 2001-12-05 2004-02-19 Sun Isle Casual Furniture, Llc Floor covering from synthetic twisted yarns
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US7472535B2 (en) * 2003-11-18 2009-01-06 Casual Living Worldwide, Inc. Coreless synthetic yarns and woven articles therefrom
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FR3009238B1 (en) 2013-07-30 2016-10-28 Michelin & Cie RADIAL TIRE HAVING ALLOY BELT STRUCTURE
JP6322283B2 (en) 2013-07-30 2018-05-09 コンパニー ゼネラール デ エタブリッスマン ミシュラン Radial tire with lightweight belt structure
JP5866326B2 (en) * 2013-10-21 2016-02-17 ソ ヒュン ジョン Method for producing heat-resistant spun yarn
FR3032151B1 (en) 2015-02-03 2017-02-17 Michelin & Cie RADIAL TIRE HAVING IMPROVED BELT STRUCTURE
FR3032149B1 (en) 2015-02-03 2017-02-17 Michelin & Cie RADIAL TIRE HAVING A VERY FINE BELT STRUCTURE
FR3032147B1 (en) 2015-02-03 2017-02-17 Michelin & Cie RADIAL TIRE HAVING IMPROVED BELT STRUCTURE
FR3032150A1 (en) 2015-02-03 2016-08-05 Michelin & Cie RADIAL TIRE HAVING IMPROVED BELT STRUCTURE
JP6074634B1 (en) * 2015-07-16 2017-02-08 パナソニックＩｐマネジメント株式会社 Electric cable

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FI95288C (en) 1996-01-10
FR2673202A1 (en) 1992-08-28
FI920741A0 (en) 1992-02-20
EP0500480A1 (en) 1992-08-26
FI95288B (en) 1995-09-29
FR2673202B1 (en) 1994-01-07
DE69200975D1 (en) 1995-02-09
FI920741A (en) 1992-08-22
CA2061428A1 (en) 1992-08-22
DE69200975T2 (en) 1995-08-10
US5442903A (en) 1995-08-22

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