EP2041343B1 - Method for manufacturing a textile yarn for technical usage - Google Patents

Abstract

The yarn comprises a core yarn (1) sheathed in at least one hot-melt yarn (2) forming adjacent turns (2a). According to the method, said hot-melt yarn (2) is treated to bond the turns (2a) together in such a way that said turns (2a) do not adhere to the core yarn.

Description

The invention relates to the technical field of textile yarns for technical use for conferring on the products in which they are incorporated, in whole or in part, specific mechanical characteristics such as, for example, anti-cut characteristics and characteristics. of fire.

The invention also relates to an application of this type of technical thread in the field of protective gloves in particular, and protection in general, both in terms of clothing and certain products in the field of building and public works, and upholstery in the transport field (seats, walls, etc ...)

Various technical solutions have been proposed for making textile yarns for technical use, depending on the desired applications. For example, it is well known to one skilled in the art that in the field of anti-cut, it is possible to use glass filaments or stainless steel to form a reinforcement. The products knitted from this type of reinforced yarn have a certain thickness that can therefore adversely affect comfort. It is also observed that these materials can break and fragment, so that fibrils can pass through their protective layer. This results in discomfort for the wearer of products made from this type of son; clothing, gloves, ... There is also a risk related to health, fibrils can be found in the atmosphere of the workplace.

Technical threads are also known in the form of wires with complex cores associating metal, in parallel or otherwise, with son or glass fibers, synthetic yarns (polyethylene, aramid, etc.) or extensible yarns.

In an attempt to remedy these disadvantages of discomfort and degradation of touch and allergy to wear, various solutions have been proposed.

For example, the patent US 4,299,884 proposed to have parallel to a main core, several son whose melting point is lower than that of the core and the cover wire, to ensure a connection between the main core and the cover wire during a appropriate heat treatment. This document also proposes to use a hot-melt yarn first wrapping, always aiming to bind the core with the cover yarn in second wrapping. There is therefore a connection between the main core and the cover wire.

The interest of intimately bonding the metal core to the hot-melt material, in order to block the components of the soul, is also apparent from the teaching of the patent. US 6,216,431 . In particular, this patent describes the use of flexible and fusible thermoplastics or layers of adhesive liquids to encapsulate the core materials that could pose a danger of contamination to the environment. After heat setting, the adhesive fibers or liquids and the components of the core are intimately linked.

It is also worth mentioning the patent WO 2005/080650 which the applicant hereby also holds. This patent describes a thread reinforced textile comprising a core wire selected from a material capable of providing mechanical strength, the core wire being covered with at least one low melting point multifilament. A heat treatment provides a connection of the core wire and the multifilament. Again, there is a connection between the different components (core and cover).

The aforementioned patent US 6,216,431 also discusses the possibility of embedding the selected core with a layer of material to create an inner protective barrier separating the core from the hot melt cover wire. To obtain this result, the core wire is surrounded with an underlayer, in order to isolate it from the hot-melt layer.

• une opération supplémentaire, donc un coût plus élevé ;
• une augmentation du titre du fil constituant une entrave à l'utilisation des fils sur jauges fines, supérieur à 10 dans le cas de gants de protection ;
• une augmentation de la rigidité du fil au détriment du confort ;
• une réduction de la performance du fil par une diminution du pourcentage de la matière active dans le produit final.

This solution can not, however, be considered satisfactory since the presence of this sub-layer entails:

• an additional operation, therefore a higher cost;
• an increase in the titer of the yarn constituting an obstacle to the use of threads on fine gauges, greater than 10 in the case of protective gloves;
• an increase in the rigidity of the yarn at the expense of comfort;
• a reduction in yarn performance by a decrease in the percentage of the active ingredient in the final product.

The object of the invention is to remedy these disadvantages in a simple, safe, effective and rational manner.

The problem to be solved by the invention is to be able to isolate the core son in order to create a waterproof wall with the environment, without requiring the use of an intermediate underlayer with the disadvantages listed above, while aiming to achieve the finest possible technical threads, especially in the case of application to cut-resistant protective gloves that comply with EN 388 and ISO 13997.

This problem is solved by the features of claim 1.

• le fil d'âme est constitué par l'association d'un fil de verre et d'un fil en acier inoxydable;
• le fil thermofusible est un fil de polypropylène.

The invention also relates to a wire for technical use comprising a cored core wire with at least one hot-melt wire constituting contiguous turns, according to which, in the case of an anti-cut wire:

• the core wire is constituted by the combination of a glass wire and a stainless steel wire;
• the hot-melt yarn is a polypropylene yarn.

• le fil de verre est d'environ 11 TEX et le fil en acier inoxydable d'environ 50 µ ;
• le fil de polypropylène est d'environ 11 TEX ;
• la torsion de guipage est d'environ 900 t/m ;
• le titre final est d'environ 40 TEX ; .
• le fil d'âme représente environ 69 % de la composition et le fil thermofusible, environ 31%.

Advantageously:

• the glass wire is about 11 TEX and the stainless steel wire about 50 μ;
• the polypropylene yarn is about 11 TEX;
• the twist of wrapping is about 900 t / m;
• the final title is about 40 TEX; .
• the core wire represents about 69% of the composition and the hot-melt wire, about 31%.

• le fil d'âme est constitué par un fil de verre ou basalte ;
• le fil thermofusible est un fil de polyester additivé avec un produit retardateur de flamme.

In the case of a fire-resistant wire:

• the core wire is constituted by a glass wire or basalt;
• the hot-melt yarn is a polyester yarn additive with a flame retardant product.

• le fil de verre est d'environ 34 TEX ;
• le fil de polyester est d'environ 17 TEX ;
• le titre final est d'environ 53 TEX ;
• le fil d'âme représente environ 65 % de la composition et le fil thermofusible, environ 35 %.

Advantageously, in the case of a non-fire wire:

• the glass wire is about 34 TEX;
• the polyester yarn is about 17 TEX;
• the final title is about 53 TEX;
• the core wire represents about 65% of the composition and the hot-melt wire, about 35%.

As indicated, the invention finds an advantageous application, which however can not be considered as limiting, for the production of protective gloves. For example, the invention can be applied in the field of construction, miscellaneous clothing, seats, and various clothing in the field of transportation.

The invention is illustrated, by way of non-limiting example, by the single figure of the drawing which shows an embodiment of a textile yarn for technical use obtained according to the invention, this view being shown in section, of a schematic nature and on a large scale, for a better understanding.

The wire for technical use comprises a core wire (1) covered with at least one hot-melt wire (2) constituting contiguous turns (2a).

According to a characteristic at the base of the invention, the hot-melt yarn (2) (covering yarn) is subjected to a heat treatment capable of binding the turns (2a) to each other without the said coils (2a) adhering to the yarn. of soul (1). The level of torsion is calculated so that the turns are joined.

As will be indicated in the following description, the wire (2) is subjected to a continuous heat treatment so that the turns (2a) are welded together without adhering to the components of the core wire (1), in order to leave these components a certain degree of freedom for a total flexibility of the final thread.

The heat treatment consists in heating by contact and convection, continuously and at high temperature, the outside only of the wire (2), so as to create a thermal shock. As a result, only the outside of the thermofusible sheath (2) receives the heat energy necessary for the fusion of the turns (2a). For example, any type of "high temperature" furnace used in the field of texturing and having specific arrangements to meet sheathing method requirements with the purpose of allowing the superficial thermofusion of the sheath.

• Exemple 1 : fil anti-coupure :
  • Ame : fil inox 50µ / fil de verre 11 TEX ;
  • Couverture : fil continu de polypropylène 11 TEX ;
  • Torsion : 900 t/m ;
  • Titre final : 39 TEX ;
  • Composition : gaine 31.1 % / âme 68,9 %.
• Exemple 2 : fil non feu :
  • Ame : fil de verre ou basalte 34 TEX ;
  • Couverture : fil continu de polyester additivé avec un produit retardateur de flamme 16,7 TEX ;
  • Titre final : 52,8 TEX ;
  • Composition : gaine 34.4 % / âme 65,6 %.

Of course, the choice of core son (1) and hot melt (2) depends on the end use of the wire. Reference is made to the following examples for the production of a reinforcing thread used as a base wire for a wire resistant to cutting or fire:

• Example 1: anti-cut wire:
  • Core: 50μ stainless steel wire / 11 TEX glass wire;
  • Cover: 11 TEX polypropylene continuous yarn;
  • Twisting: 900 t / m;
  • Final Title: 39 TEX;
  • Composition: 31.1% sheath / 68.9% core.
• Example 2: fire wire:
  • Soul: glass wire or basalt 34 TEX;
  • Cover: Continuous polyester yarn additive with a flame retardant product 16.7 TEX;
  • Final Title: 52.8 TEX;
  • Composition: sheath 34.4% / core 65.6%.

• d'accroître certaines propriétés, telles que résistance à la coupure, à l'abrasion, au déchirement, ...
• d'améliorer certaines qualités de perception, telles que toucher, élasticité, dextérité, notamment par adjonction d'élasthanne, par exemple ;
• d'améliorer la mise en oeuvre au niveau des produits finis (par exemple, dans le cas de housse de siège élastique) ;
• de pouvoir réaliser une teinture sur fil.

The yarn for technical use as described and obtained according to the method at the base of the invention constitutes a basic yarn. In other words, this base wire can receive, during a subsequent operation that can be deferred or continuous to the basic process, another cover resulting, for example, wrapping operations, wiring, torsion, ... This cover may have the purpose, separately or in combination:

• to increase certain properties, such as resistance to cutting, abrasion, tearing, ...
• to improve certain qualities of perception, such as touch, elasticity, dexterity, especially by adding elastane, for example;
• to improve the implementation of finished products (for example, in the case of elastic seat covers);
• to be able to perform a dyeing on wire.

It is also recalled that, in the case of the cut-resistant yarn (example 1), the combined use of a glass yarn and a metal wire, to produce the core yarn, makes it possible to meet both standards. used, ie EN388 and ISO13997. Indeed, the addition of glass makes it possible to respond to the level of the cut resistance required by the EN388 standard, while the addition of steel makes it possible to respond to the level of the cut resistance required by the ISO13997 standard,

• gant de protection anti-coupure et/ou anti-feu ;
• vêtement de protection (combinaison pour pilote, pompier, ...., à usage militaire, ...
• vêtement de protection contre le feu et/ou anti-coupure ;
• éléments de protection dans le domaine du bâtiment et des travaux publics (stores, renforcements de structures, protection de poutrelles métalliques contre le feu, filtres, ...) ;
• éléments d'habillage dans le domaine du transport (sièges, murs, etc...)

The advantages are apparent from the description. In particular, it is recalled the numerous applications of the wire for technical use according to the invention:

• anti-cut and / or fire protection glove;
• protective clothing (combination for pilot, fireman, ...., for military use, ...
• protective clothing against fire and / or cut-off;
• protective elements in the field of building and public works (blinds, reinforcements of structures, protection of metal beams against fire, filters, ...);
• elements of clothing in the field of transport (seats, walls, etc ...)

Claims (8)

1. A method for manufacturing a textile yarn for technical usage comprising a core yarn (1) sheathed in at least one melt-fusible yarn (2) forming adjacent turns (2a),
   characterized in that said melt-fusible yarn (2) is subjected to a treatment by which the outside of the melt-fusible yarn (2) is continuously heated by contact and convection at a high temperature to create a thermal shock so that only the outside of the sheath of the melt-fusible yarn receives the energy necessary to bond the turns (2a) with one another by melting, but without said turns (2a) adhering to the core yarn.
2. Yarn for technical usage obtained by implementing the method according to claim 1, characterized in that, in the case of a cut-resistant yarn:

   - the core yarn (1) is formed by the combination of a glass yarn and a stainless-steel yarn;

   - the melt-fusible yarn (2) is a polypropylene yarn.
3. Yarn according to claim 2, characterized in that:

   - the glass yarn is approximately 11 TEX and the stainless-steel yarn approximately 50 µ;

   - the polypropylene yarn is approximately 11 TEX;

   - the sheath twist is approximately 900 tpm;

   - the final yarn count is approximately 40 TEX;

   - the core yarn accounts for approximately 69% of the composition and the melt-fusible yarn for approximately 31 %.
4. Yam according to claim 2, characterized in that, in the case of a fire-resistant yam:

   - the core yarn (1) is formed by a glass or basalt yam;

   - the melt-fusible yarn (2) is a polyester yarn containing a flame-retardant additive.
5. Yam according to claim 4, characterized in that:

   - the glass yarn is approximately 34 TEX;

   - the polyester yarn is approximately 17 TEX;

   - the final yarn count is approximately 53 TEX;

   - the core yarn accounts for approximately 65% of the composition and the melt-fusible yarn for approximately 35%.
6. Use of a yarn for technical usage according to any one of claims 1 to 5 for manufacturing a protective glove, in particular a cut-resistant and/or fire-resistant glove.
7. Use of a yarn for technical usage according to any one of claims 1 to 5 for manufacturing a protective garment.
8. Use of a yarn for technical usage according to any one of claims 1 to 5 for manufacturing protective elements in the technical field of building and public works and transportation.

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