ES2321389T3 - NUCLEO AND WRAPPING FIBERS, CONDUCTIVES, REPELLENTS OF DIRT, WITH A HIGH RESISTANCE TO CHEMICAL AGENTS, PROCEDURE FOR THEIR PRODUCTION AND USE. - Google Patents

Abstract

A hotmelt spun fiber has a core and a mantle structure having a combined tensile stregnth of at least 15 cN/tex. The core is a synthetic thermoplastic polymer which is not a fluoro-polymer. The mantle is a hotmelt spun fluoropolymer incorporating particles which are electrical conductors. The core is a synthetic thermoplastic polymer esp. polyester. e.g. polyethylenterephthalate or a liquid crystaline polyester. Also claimed is a hotmelt spinning process in which two compatible polymers are selected in which the melting point of the second polymer is at least 20C below that of the first, and in which the two polymers are co-extruded and stretched to achieve the desired tensile strength value.

Description

Core and wrap fibers, conductive, dirt repellents, with high resistance to agents Chemicals, procedure for its production and its use.

The present invention relates to fibers of core and shell, conductive, dirt repellent, in in particular to monofilaments, which in particular can be used in loom fabrics for technical uses.

It is known that fluorinated polymers have good thermal stability, good resistance to agents chemical and dirt repellent properties. Has already been tried to transform fluorinated polymers, melt spun, into fibers, multi- and monofilaments, in order to produce from they or they textile surfaces for technical applications with the above-mentioned properties of fluorinated polymers. Disadvantageously in the case of spun fluorinated polymers by Fusion the high plastic deformation behavior. For the Therefore, the fibers and filaments based on this material have only small tensile strengths and they are not dimensionally stable.

It has also been attempted to combine fluorinated polymers with polymers that have good mechanical properties for use, eg with a poly (ethylene terephthalate) (hereinafter also referred to as "PET"). In this case, it can be verified, however, that fluorinated polymers are often incompatible with other polymers and as a rule do not intermingle. It is therefore often a mixture of two phases, in which the fluorinated polymers form space islets. The proportion by weight of a fluorinated polymer, which can be added in dosage, is therefore with limited frequency, since the interface boundary layers of the polymers
stick only badly to each other. In the fibers, this property becomes appreciable as "tendency to splice".

The monofilaments based on a PET and the statistical copolymers based on ethylene and tetrafluoroethylene
("ETFE") are commercially available for many years. Frequently, these fibers, for stabilization against hydrolysis, have a low content of carboxyl end groups, and for the closure of carboxyl end groups they are stabilized with carbodiimides. The closure of carboxyl groups by carbodiimides is described eg in European patent application documents EP-A-417,717 and EP-A-503,421.

Loom fabrics for technical uses, which are They can produce from these filaments, they have widely the mechanical properties of a PET monofilament, but, without However, with high resistance to hydrolysis and improved dirt repellency. Thermal stability and stability against the chemical agents of these fibers, because of the relatively small proportion of fluorinated polymers, they correspond to the essential to the values of pure PET. High Splicing tendency can be made noticeable, however, in the case of mechanical loads, eg when bumping the loom comb.

Fibers based on synthetic polymers and loom fabrics, produced from them, have nonetheless the disadvantage that friction can be loaded with static electricity. Conductive fibers for production of flat textile structures, such as loom fabrics for a technical employment, or for other employment purposes, eg for brushes, were since then a goal of numerous developments and refinements

From the patent application document German DE-A-198 26 120 known a electrically conductive loom fabric, flame retardant, which contains electrically conductive fibers and non-fibers conductive electrically prepared to be non-flammable. The electrically conductive fibers may have particles electrically conductive, such as black particles of carbon or metal, may have some coatings metallic, or can be composed of conductive materials electrically such as poly (anilines). As materials of The fibers are described polyesters and polyolefins.

From the utility model document German DE-U-86 238 79 known spun yarns for the production of spiral ribbons, which are wrapped with a layer based on hardenable polymers. This layer Contains electrically conductive carbon. As a polymer for wrapping layers are mentioned by way of example resins of melamine, epoxides, phenolic resins or polyurethanes.

The document DE-A-39 38 414 describes tissues of Loom very mechanically resistant, based on artificial fibers, these being incorporated in the weaving in the form of fibers electrically conductive in the weft and warp, and also They contain electrically non-conductive fibers. Fibers Electrically conductive are composed of polyolefins and contain Graphite or carbon black.

The document EP-A-160,320 describes monofilaments core and wrap for use in hair brushes to base of selected polymers. The core contains a nylon or polyesters, comprising at least 60% by weight units of poly (butylene terephthalate). The envelope contains some special types of nylon or copoli (ether esters).

From the document DE-U-86/06334 fibers are known of core and envelope, whose core is composed of a material thermoplastic synthetic, preferably based on a polyamide, and whose shell is composed of a conductive synthetic material electrically, preferably based on a polyamide, which Contains built-in carbon black or metals.

The Japanese patent application document JP-A-07 / 278,956 describes some electrically conductive copolyesters, which primarily they contain units of poly (butylene terephthalate) and that They are doped with carbon black. Fibers of core and wrap based on this material, in which the core It is composed of an aromatic polyester.

From the patent application document International WO-A-98 / 14.647 SE know electrically conductive heterofilaments, which can be structured as core and shell fibers. As examples of polymers for the core and the sheath are those of PET and other polyesters or mixtures of PET and nylon.

The document WO-A-01 / 20.076 discloses fabrics no woven (in English non-wovens) with a high dielectric constant. As fiber material they are proposed mixtures of a polyvinylidene fluoride and a Polypropylene. Products produced from them are distinguish for a prolonged period of half-life  of electrostatic charges, and can be used as filters electrostatics

U.S. Patent Document US-A-6,085,061 describes a brush to clean electrostatically charged surfaces. How fibrous materials can be used core fibers and envelope, whose core is conductor of electricity and whose Wrap is composed of a poly (vinylidene fluoride).

From the document DE-A-44 12 396 fibers are known not electrically conductive, not stretched and spun by fusion, with a core and shell structure, whose wraps contain fluorinated polymers. As the core polymer a polycarbonate This fiber is used as an optical fiber and, because Low mechanical resistance is not suitable for genres textiles for technical uses, such as loom fabrics for technical uses In addition, in the case of a light wave conductor, it's about getting a high reflection in the boundary layer of interface and damping as small as possible of the electromagnetic wave Both properties can be achieved only through the use of a very pure coating.

From the document JP-A-2001-127.218 se describes a semiconductor fiber based on a fluorinated polymer It contains carbon black. This fiber has no core structure and wrap and is used for production of nonwoven fabrics, for example by the process of meltblown melting (in English melt flow). Fiber is not stretched out

The document WO-A-03/004738 more priority old, but not previously published, describes fibers of core and wrap with high mechanical strength and good resistance to chemical agents. Fiber wrap It contains a fluorinated polymer. Combinations of a PET are described as a core material and a PVDF as a material of the envelope. This document also discloses in a general way the possibility of adding additives to the core or to the envelope. As possible additives are mentioned, among others, some materials electrically conductive

Starting from this state of the art, the The present invention was based on the mission of combining the advantages techniques for applications of known materials for fiber production, without having to accept the disadvantages known with the use of individual materials.

For an expert in the specialty it is known that in the interface boundary layer of two polymers appear Normally adhesion problems. In particular this is valid in the case of the use of fluorinated polymers which, as is known, is adhere poorly with other polymers. Surprisingly, it has been shown that in the case of the use of a fluorinated polymer doped with electrically conductive particles you can get a very Good adhesion with the polymer core.

An additional mission of the present invention therefore consists in the tuning of core fibers and wrap with good adhesion between the individual layers.

With the present invention they are tuned by consequently some fibers, in particular monofilaments, which have antistatic properties combined with high chemical and thermal stability and have good stability dimensional mechanics as well as tensile strength.

The invention relates to a fiber spun by fusion, with a core and shell structure and that has a tensile strength of at least 15 cN / tex, whose core contains a melt spun synthetic thermoplastic polymer, with a first melting point, which is no fluorinated polymer, and whose shell contains at least one fluorinated spun polymer by fusion with a second melting point, which is located so less at 20 ° C below the first melting point, and about particles based on an electrically conductive material, whose proportion is up to 50% by weight, based on the amount of wrapping material

The synthetic thermoplastic polymers, which form the core, can be of an arbitrary nature, as long as they are melt spun and give the fiber the desired properties for the respective application purpose. Fluorinated polymers are not encompassed by synthetic thermoplastic polymers, although the core, together with these polymers, may also contain fluorinated polymers as components of the
mixtures

Examples of synthetic thermoplastic materials they are polyolefins, such as a polyethylene, a polypropylene, or copolymers containing ethylene and / or propylene units in binding with other units of alpha-olefins copolymerizable with them, such as those of alpha-butylene, alpha-pentylene, alpha-hexylene or alpha-octylene; polyesters such as a polycarbonate, polyesters aliphatic / aromatic or fully aromatic polyesters; polyamides, such as aliphatic or aliphatic / aromatic polyamides (types of nylon) or fully aromatic polyamides (aramid); or poly (ether ketones), that is to say polymers that they have at least ether and ketone groups and that as a rule they generally have divalent aromatic radicals, such as phenylene, in the repeated chain, many combinations of these groups, for example PEK, PEEK or PEKK; or poly (sulfides arylene), preferably a poly (phenylene sulfide); or poly (ether esters), that is to say polymers that have at least ether and ester groups and as a rule aromatic radicals divalents, such as phenylene, in the repeated chain, for example TPE-E; or a poly (acrylonitrile) or copolymers of poly (acrylonitrile) with other ethylenically comonomers unsaturated, such as acrylic or methacrylic acid.

Preferably, the core of the fibers of core and shell according to the invention contains polyamides and in particular polyesters

Thermoplastic polyamides, which pass to preferably used in the compositions according to the invention, They are known per se.

Examples of them are polyamides that form threads, such as aliphatic or aliphatic / aromatic polyamides, such as eg a poly (caprolactam), a poly (hexamethylene acid diamide 1,6-diamino-adipic), a poly (hexamethylene acid diamide 1,6-diamino-sebaceous), a poly (hexamethylene acid diamide 1,6-diamino-terephthalic) or a acid poly (hexamethylene diamide 1,6-diamino-isophthalic), or also fully aromatic polyamides, such as a poly (phenylene diamide acid 1,4-diamino-terephthalic) or a poly (phenylene diamide acid 1,4-diamino-isophthalic).

The polyamides used according to the invention they usually have viscosity indices according to the DIN 53727 from 120 to 350, preferably from 150 to 320 cm3 / g (measured at 25 ° C in sulfuric acid).

The thermoplastic polyesters that pass to used especially preferably in the compositions according to the invention and / or the aromatic crystalline polyesters Liquids are known per se.

Examples of them are polyesters that form threads, such as a polycarbonate, or polyesters aliphatic / aromatic such as eg a poly (terephthalate of butylene), a poly (terephthalate of cyclohexane dimethyl), a poly (naphthalate of ethylene) or in particular a poly (ethylene terephthalate), but also fully aromatic, crystalline polyesters liquids, such as a poly (oxy-benzo-naphthoate). Polyester links forming threads are preferably diols and dicarboxylic acids, or acids respectively correspondingly constituted oxycarboxylics. The component main acid of the polyesters is terephthalic acid or the cyclohexane-dicarboxylic acid, but also other aromatic dicarboxylic acids and / or may be appropriate aliphatic or cycloaliphatic, preferably aromatic compounds in position for or trans, such as eg acid 2,6-naphthalene dicarboxylic acid or 4,4'-biphenyl-dicarboxylic acid but also the acid p-hydroxy-benzoic. Acids aliphatic dicarboxylic acids, such as eg adipic acid or acid sebaceous, preferably used in combination with acids aromatic dicarboxylic.

Typical appropriate divalent alcohols are aliphatic and / or cycloaliphatic and / or aromatic diols, for example ethylene glycol, propanediol, 1,4-butanediol, 1,4-cyclohexanedimethanol or also hydroquinone. Be they prefer aliphatic diols that have two to four atoms carbon, in particular ethylene glycol; diols are also preferred cycloaliphatics such as 1,4-cyclohexanedimethanol.

Preferred thermoplastic polyesters are select in particular from the set that consists of a poly (ethylene terephthalate), a poly (naphthalate of ethylene), a poly (butylene naphthalate), a poly (propylene terephthalate), a poly (terephthalate of butylene), a poly (cyclohexanedimethanol terephthalate), a polycarbonate or copolycondensate containing units of poly (butylene glycol), terephthalic acid and acid naphthalene dicarboxylic.

Other preferred aromatic polyesters are ones liquid crystalline aromatic polyesters, in particular ones polyesters containing units of p-hydroxybenzoate.

In particular, in the case of fibers that are due used in humid and hot environments, such as in the case of monofilaments in their use in paper machines, and that as core components contain polyesters, these polyesters are stabilized against hydrolysis decomposition preferably by adding stabilizing agents of polyesters.

Such stabilized fibers show a significant decrease in the tendency to decompose polyester, so that durations of shelf life of monofilaments that are equivalent to those of monofilaments based on extremely fiber materials stable, such as poly (sulfides and arylene oxides).

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Especially preferred are fibers that contain stabilized polyesters in the core, so Especially preferred carbodiimides.

The polyesters used according to the invention they usually have solution viscosities (VI values) of at least 0.60 dl / g, preferably from 0.60 to 1.05 dl / g, of especially preferred way of 0.62-0.93 dl / g, (measured at 25 ° C in dichloroacetic acid (DCE)).

The fluorinated polymers, which form the wrap, they can also be of an arbitrary nature, provided when these are melt spun and have a point of melting that is at least 20 ° C below the point of fusion of the thermoplastic core polymer.

The fluorinated polymers used according to invention are homopolymers and / or copolymers of poly (fluoro-olefins) that are derived from ethylenically unsaturated fluorinated olefin monomers and others monomers copolymerizable with them. Such polymers are also known per se.

Examples of them are spinnable copolymers by fusion of tetrafluoroethylene with others alpha-olefins, such as ethylene, propylene, butylene, hexylene or octylene.

You can also use homo- o copolymers that are derived from other fluorinated monomers, for example  of mono-, di- or trifluoroethylene, of vinyl fluoride or in Particular of vinylidene fluoride.

Especially preferably, they are used melt spun copolymers of tetrafluoroethylene with at minus an alpha-olefin, preferably with ethylene.

In a particularly preferred way, it is used as a shell component a poly (fluoride of vinylidene) ("PVDF").

When spinning polyesters, in particular a PET, with a PVDF to give a two component monofilament with the core and shell structure, surprisingly shows a Very good adhesion between the core and the wrap.

The invention therefore refers also to a heterofilamentous fiber that contains at least two components, the first component being an electrical insulator and comprising a thermoplastic polymer, which is no polymer fluorinated, and the second component comprising a poly (vinylidene fluoride).

The particles present in the envelope of the fusion spun fibers according to the invention, based on a electrically conductive material, can be of a nature arbitrary, as long as they give the envelope a high electrical conductivity

In this case you can try particles to carbon base, for example carbon fiber, carbon black or graphite; based on metals, for example based on copper, silver, aluminum or iron; based on metal alloys, for example a base of a bronze; or based on conductive synthetic materials, for example based on poly (anilines) or based on a poly (pyrrole).

The particles can be presented in a form arbitrary, for example in the form of fibers or in the form of particles round or irregular.

The content of the conductive particles electrically in the envelope must be chosen in such a way that a clear rise in conductivity is provided Electric synthetic material. Typical proportions fluctuate in the range of up to 50% by weight, preferably from 2 to 15% by weight, referring to the proportion of the material of envelope.

Spinned fibers are especially preferred by fusion, in which the envelope contains between 2% by weight and 15% in weight, in particular between 4% by weight and 9% by weight, of particles electrically conductive

Core and shell fibers conforming to invention can be presented in an arbitrary form, for example as multifilaments, as staple fibers or in particular as monofilaments

The title of core and shell fibers according to the invention may also fluctuate within wide limits. Examples of them are 100 to 45,000 dtex, in particular from 400 to 7,000 dtex.

Some are especially preferred monofilaments

Monofilaments are especially preferred, whose cross-sectional shape is circular, oval or polygonal with n vertices, being n greater than or equal to 3.

The lengths of cut in the case of fibers cuts can also fluctuate within wide limits, by example between 30 and 70 mm.

The core of the core and shell fibers according to the invention forms the mechanical support of the fibers, while the envelope mainly determines the properties for use, such as antistatic behavior and sliding behavior.

A core can preferably be used as a PET raw material usual in commerce.

For wrapping it is used so Especially preferred is a fluorinated polymer based on a PVDF, which had previously been developed in particular with a Carbon black to give a spinnable mixture.

The weight ratio of component A) that the core forms the component B) that forms the envelope, referred to the total amount of these components, for component A) is of 50 to 95% by weight, preferably 60 to 80% by weight, and for component B) is 50 to 5% by weight, preferably 40 to 20% by weight.

The production of core fibers and wrap according to the invention can be made in accordance with procedures known per se.

These procedures cover the measures techniques of:

i)

choose a first polymer, which is a polymer melt spun synthetic thermoplastic and is not a polymer fluorinated, and that has a first melting point,

ii)

choose a second polymer, which is a polymer Spinning fluorinated fluoride, which has a second melting point, which is located at least 20ºC below the first point of fusion, and containing particles of a conductive material electrically

iii)

co-extrude the first polymer and the second polymer through a spinning nozzle for heterofilaments, at a spinning temperature above the first point of fusion, so that a two component fiber is constituted with a core based on the first polymer and a shell based on the second polymer, and

iv)

stretch the core and wrap filament that has been formed, in order to increase resistance to traction.

The two polymers or respectively the two mixtures containing these polymers are dried preferably immediately before the contribution to the extruder, they melt inside of the extruder and filtered through a gasket of spinning The fluorinated polymer is provided with the particles electrically conductive This is usually done before the contribution of fluorinated polymer to the extruder, but it can also be carried out immediately in front of the spinning gasket. Standard batches containing the standard may also be used. fluorinated polymer and electrically conductive particles.

After pressing the melts polymeric through a spinning nozzle for heterofilaments, the molten polymer thread is cooled in a bath spinning, for example in a water bath, and then it is rolled up or removed. The withdrawal speed is in this case greater that the projection velocity of the polymeric melt and therefore produces a stretch of the formed thread.

The spun yarn for heterophilaments as well produced, is then subjected to subsequent stretching, especially preferably in several stages, in particular a subsequent stretch in two or three stages, with a relationship of total stretch from 1: 3 to 1: 8, preferably from 1: 4 to 1: 6

After stretching, it follows a thermal fixation is preferred, using some temperatures from 130 to 280 ° C; in that case you work with a constant length or a contraction of up to 30% is allowed.

As especially advantageous for the monofilament according to the invention, it has been stated that work at a melting temperature in the range of 285 to 315 ° C and with a spin deformation of 1: 2 to 1: 6.

The withdrawal speed during spinning is usually 10-40 m per minute.

By spinning the thermoplastic core polymer and the fluorinated polymer of the shell to give a monofilament of Two components with a core structure and shell, shown surprisingly a very good adhesion between the core and the envelope.

The conductivity of the envelope may be lost. when stretching, but can be reset again by heat treatment and the contraction caused by it, preferably above the melting point of the material of the wrap, but below the melting temperature of the nucleus.

The surface properties are determined mainly by fluorinated polymer doped to be conductive. The fibers according to the invention are distinguished by a very good dirt repellency, good stability against Chemical agents and good electrical conductivity.

The combination with the fluorinated polymer leads to fibers with improved sliding properties, compared with fibers based on a pure thermoplastic polymer. These fibers show, compared to fibers based on a pure thermoplastic polymer, an increased repellency of the dirt.

The fibers according to the invention may contain, together with components A) and B), auxiliary substances or adjuvants Examples of these are adjuvant agents of the elaboration, stabilizers, antioxidants, plasticizers, gliding agents, pigments, matting agents, viscosity modifiers or accelerators of the crystallization.

Examples of adjuvant agents of the processing are siloxanes, waxes or chain carboxylic acids plus  long or its salts, esters or aliphatic or aromatic ethers.

Examples of stabilizing agents and antioxidants are polyesters stabilizing agents since mentioned above, phosphorus compounds, such as esters of phosphoric acids, or carbodiimides.

Examples of pigments or matting agents are organic coloring pigments or titanium dioxide.

Examples of agents modifying the viscosity are multivalent carboxylic acids and their esters, or multivalent alcohols.

The fibers according to the invention, in particular monofilaments, are preferably used for the production of flat textile structures, such as loom fabrics, woven fabrics knitted, knitted fabrics, hemp or mat fabrics and non-woven fabrics woven

Textile laminar structures that contain monofilaments according to the invention, are suitable in particular for technical purposes of use, such as filters, such as screen printing materials, or in particular as sieves for paper machines.

The monofilaments according to the invention have good textile physical properties and can be easily knitted. Loom fabrics have the usual dimensional stability of the thermoplastic polymers that form the
nucleus.

Loom fabrics based on these monofilaments are outstandingly suited for loom fabrics for technical uses, in particular in media filtration aggressive, in whose cases there is also the danger of a acquisition of electrostatic charges, that is in particular in the case of solid-gas filtration or solid-liquid

The invention also relates to the use of fibers for the production of textile flat structures, which are used in environments with strong chemical solicitation and / or physical, in particular as sieves for paper machines or as loom fabrics for technical uses, as used, e.g. in filtration, for the production of conveyor belts or as reinforcement insertion elements. Here, the fibers pass to used as monofilaments and in particular as weft threads in loom weaving

The use of monofilaments conforming to invention as sieves of paper machines can be carried out in the forming part (in English forming), in the pressing part or in particular in the drying part. In the drying part, the monofilaments according to the invention are used in particular as spiral sieves.

For these applications, the fibers used according to the invention, in particular in the form of monofilaments, they usually have a range of titles of 10 to 4,500 tex, a modulus of elasticity from 2.0 to 8.0 N / tex, a referred resistance at fineness of 15 to 50 cN / tex, an elongation at break of 15 to 45% and a hot shrinkage at 180 ° C of 1.0 to 20.0%.

The following Example explains the invention, without Limit this one.

Core and shell fibers based on a poly (ethylene terephthalate) and a poly (fluoride vinylidene), which contain carbon black.

The components a poly (terephthalate of ethylene) ("PET") (70% by weight) and a poly (fluoride of vinylidene) (as a standard batch containing 9% black by weight carbon with conductivity; Palmarole EXP 184/14; 30% by weight) they were melted in two extruders with a temperature guide by separated (PET at a melting temperature of 282 ° C (material of core) or respectively a PVDF at a melting temperature of 240 ° C (envelope material), and spun through a Spinning nozzle with 20 holes, which had a diameter of 1.40 mm hole, and with a withdrawal speed of 15 m / min, to give a core and shell monofilament, two stretched times (a first stretch in a water bath at 80 ° C; a second stretching in a hot air channel at 150 ° C), and it was fixed thermally in a hot air channel at 205 ° C. Stretching Total was 4.1: 1. The final diameter of the core monofilament and wrap was 0.500 mm.

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The core and shell monofilament, which is had obtained, had the following properties:

100

Claims (13)

1. Fused spun fiber with a structure of core and sheath and a tensile strength of so minus 15 cN / tex, whose core contains a thermoplastic polymer Synthetic spin-melt with a first melting point, which does not it is no fluorinated polymer, and whose shell contains at least a fluoridable polymer meltable by fusion with a second point of fusion, which is located at least 20 ° C below the first melting point, and particles based on a conductive material electrically, whose proportion is up to 50% by weight, based on the amount of the wrapping material, and ascending that of the core to 50 to 95% by weight and the envelope to 50 to 5% by weight, referred to the total amount of the core and the envelope. 2. Fused spun fiber according to claim 1, characterized in that the synthetic thermoplastic core polymer is a polyamide and in particular a polyester. 3. Fused spun fiber according to claim 2, characterized in that the polyester is a poly (ethylene terephthalate). 4. Fused spun fiber according to claim 2, characterized in that the polyester is a liquid crystalline polyester. 5. Fused spun fiber according to claim 1, characterized in that the fluorinated spun fluorinated polymer is a tetrafluoroethylene copolymer with at least one alpha-olefin, preferably ethylene. 6. Fused spun fiber according to claim 1, characterized in that the fluorinated spun fluorinated polymer is a polyvinylidene fluoride. 7. Fused spun fiber according to claim 1, characterized in that the envelope contains 2 to 15% by weight of electrically conductive particles. 8. Fused spun fiber according to claim 6, characterized in that the envelope contains between 2% by weight and 15% by weight, in particular between 4% by weight and 9% by weight, of electrically conductive particles. 9. Fused spun fiber according to claim 1, characterized in that the particles based on an electrically conductive material are composed of carbon, metals or metal alloys, in particular carbon black or graphite. 10. Fused spun fiber according to claim 1, characterized in that this is a filament, in particular a monofilament. 11. Procedure for the production of fusion spun fibers with a core and shell structure according to claim 1, comprising the following technical measures:

i)

choose a first polymer, which is a polymer melt spun synthetic thermoplastic and is not a polymer fluorinated, and that has a first melting point,

ii)

choose a second polymer, which is a polymer Spinning fluorinated fluoride, which has a second melting point, which is located at least 20ºC below the first point of fusion, and containing particles based on a conductive material electrically, whose proportion is up to 50% by weight, based on the amount of the wrapping material,

iii)

co-extrude the first polymer and the second polymer through a spinning nozzle for heterofilaments to a spinning temperature above the first point of fusion, so that a fiber of two is constituted components with a core based on the first polymer and a shell based on the second polymer, and

iv)

stretch the core and wrap filament that has been formed in order to increase resistance to traction.

12. Use of fusion spun fibers with a core structure and wrap according to the claim 1, for the production of loom fabrics for uses technicians 13. Use according to claim 12, characterized in that the loom fabric for technical uses is a sieve for paper machines, a loom fabric for filters, a loom fabric for screen printing, a conveyor belt or a reinforcement insert .