DE102005041297B4 - Electrically conductive, elastically extensible hybrid yarn - Google Patents

Abstract

The invention relates to an electrically conductive, elastically stretchable hybrid yarn (3), in which an elastically stretchable core filament (1) is surrounded by an electrically conductive fibre sheath (2). This results in improved technical properties of a hybrid yarn of this kind in conjunction with a simplified manufacturing method.

Description

Technical area

The The invention relates to the field of textile yarns and the Products using such yarns, in particular when it comes to yarns that are electrically conductive and elastic are stretchy. Such products are for example surface heating elements, as for Seat heaters in the automotive sector are used. find application such yarns also for floor coverings, comforters, heatable clothing or their parts and the like, as well as shielding textiles for the derivation of electric fields.

Textile electrical surfaces serve the tempering of environments that interfere with the human body are in contact. These are usually with other textile layers by sewing or Bonding together. In other cases will be formed from corresponding heating conductors surfaces, which consists of heating conductors and their supply lines exist. Shape and size are the respective application conditions customized.

State of the art

Metallic wires are for power management though are well suited, but have little textile properties themselves, which is detrimental to the processing, such as weaving, knitting, etc. effect. These wires are completely inelastic and have no textile handle. To improve this situation, a metallic wire is added with a textile yarn or thread, usually by winding or twisting combined. By the combination consisting of wire and elastic Thread is given a certain flexibility, due to the elasticity of the textile thread reached. Both elements already exist before the wrapping process as individual threads and must be made in individual separate preliminary processes and become led together by the Umwindeprozess. The metallic handle and the rigidity can However, they are influenced only conditionally.

From the WO 2004/097089 A1 For example, an electrically conductive composite elastic yarn comprising an elastic element is known. This elastic element consists of one or more elastic threads and is covered by at least one, but preferably by a plurality of conductive threads (long threads). Each conductive thread surrounding the elastic element has a length which is greater than the stretched length of the elastic element, so that the entire elongation force applied to the composite yarn is absorbed by the elastic element. In this document is also on the US 6,341,504 31 directed. Therein is mentioned an elastic textile product which has conductive wiring for use in garments. As a result, physiological functions of the body should be displayed. In this document, an elongated band of elastic material is described, which is stretchable in the longitudinal direction and has at least one conductive wire, which either bears on the outside, or is provided within the elastic band.

Of the DE 103 42 787 A1 An electrically conductive yarn is to be taken which comprises at least one elastic core thread, at least one electrically conductive thread wound around the core thread and at least one electrically non-conductive binding thread wound around the core thread, which limits the extensibility of the entire electrically conductive yarn. A similar composite yarn is the DE 102 42 785 A1 as well as the WO 2004/027132 A1 ,

From the US 2004/0237494 A1 is an electrically conductive composite elastic yarn known with an elastic core, which is wrapped by an electrically conductive thread whose length is greater than the drawn length of the elastic core, so that substantially the entire elongation force, which is applied to the composite yarn, from the elastic Core is included.

Presentation of the invention

It the technical problem (object) of the invention is an electrical To create conductive, elastic extensible hybrid yarn, which in terms of electrical conductivity and elastic extensibility with ease of manufacture more effective is as the previously known composite yarns.

This Problem is inventively solved an electrically conductive, elastically extensible hybrid yarn, such as it is described in claim 1.

Thereby creates a homogeneous yarn with high elasticity, resulting in the overall elasticity largely the elasticity of the elastic core thread corresponds.

Preferably The core is formed by at least one thread, that of the fiber cladding is surrounded. In this case, the at least one thread of textured Polyester or Lycra or the like exist. It can also be at least an inelastic core thread is present, which is laid so that he allows a deliberate stretching of the elastic core thread, beyond but the strain is limited.

A particularly good conductivity in the Use of fibers arises in particular when the electrically conductive fibers are selected from the group:
conductive polyester fibers; Stainless steel fibers; Carbon fibers; metal-coated polymers, silver-plated, copper-plated; Nickel-plated carbon fibers.

One potential Yarn number range is 40-2000 Tex (Nm 25-0.5), wherein the fibers may have a fineness of 1.0-3.3 dtex.

Conductive fibers such as carbon fibers, nickel-coated carbon fibers, metal fibers and fibers of metal-coated polymers have as single fibers no rigidity and have largely because of their fine titer textile handle features.

to Improvement of the bond between elastic core thread and conductive sheath fibers can Lunten or conveyor belts, which in a usual Spun advancing stage, during the mixing process melt fibers, preferably mixed in a proportion of 5-10%. By a thermal aftertreatment of the elastic, conductive yarn, which z. B. can be combined with a rewinding or - also while the following textile equipment of the finished fabric can happen, the melt fibers reach a plastic Condition and stick together after cooling core thread and sheath fibers, which can significantly increase the non-slip properties of the hybrid yarn without the electrical shock Conductivities are noticeably reduced.

The hybrid thread is preferably by the so-called friction spinning method ( EP 1179622 B1 ), which connects the fibers to the core. This friction spinning process was developed by Dr. Ing. Fehrer Linz AG System Dref2 / Dref2000 developed, which is familiar to the spinning expert.

at Presence of fused fibers can be due to thermal heating After treatment of the elastic, conductive hybrid yarn, which z. B. can be combined with a Umspulprozess, or even while the following textile equipment of the finished fabric. The melt fibers reach a plastic state and Gluing after cooling core thread and sheath fibers, which significantly increases the slip resistance of the hybrid yarn elevated, without significantly reducing the electrical conductivities.

Brief description of the drawings

1 shows a perspective, schematic view of an electrically conductive, elastically extensible hybrid yarn.

2 shows a perspective view of a device for the friction spinning process.

Description of an embodiment the invention

1 shows the perspective view of a part of a hybrid yarn 3 in which a portion of the hybrid yarn in perspective view only the core thread 1 shows, here from a variety of monofilaments 4 exists, which are bundled into a total core thread. This need not necessarily be, the core thread can also be designed as a single thread. This core thread is from a fiber coat 2 surrounded by a variety of short single fibers 5 consists.

The core thread 1 is an elastically extensible thread, the z. B. made of textured polyester or Lycra, which is spun with conductive fibers. The total yarn has, for example, a yarn number range of 40-2000 Tex (Nm 25-0.5). The fiber cladding is formed, for example, from fibers having a fineness of 1.0-3.3 dtex and a cutting length of 35-60 mm. The fibers form a composite to form the shell, but this does not affect the elastic extensibility of the core thread. This is all the more true when the sheath fibers, which are electrically conductive, for example, in a proportion of 5-10% in a mixing process, melt fibers are mixed. This serves to improve the bond between elastic core thread and conductive sheath fibers. These fused fibers are admixed, for example, with the flocks or conveyor belts which are produced in a conventional spinning precursor stage.

The Sheath fibers can conductive Polyester fibers, stainless steel fibers or metal and preferably silver or copper-coated polymers, as well as carbon fibers or nickel-plated Carbon fibers.

The invention is based on the idea of an elastic, textile thread, such. As textured polyester or lycra with conductive fibers to spin. The elastic thread forms the soul, or the core of the yarn and the conductive fibers, so no finished thread, are connected by a special spinning process itself with the core thread. This is done with a device as shown in 2 is shown. In this device, the reference numeral designates 6 the supplied Lunten, with an opening roller 7 be dissolved in single fibers. The reference number 8th denotes a guide roller for feeding the core thread, and the reference numeral 9 a pulley for the discharge of the finished yarn in the area of a winding unit 10 , on the side of a dirt suction 11 is provided.

With such a device, the in 1 illustrated hybrid yarn 3 produced. For this suitable spinning process, the so-called friction spinning process of Dr. med. Fehrer Linz AG System Dref2 / Dref2000, which is known to every spinning machine expert, are used.

The Lunts are dissolved in the spinning process in individual fibers and in the placed right angle around the passing core thread and through Friction associated with this. This creates a homogeneous yarn with high elasticity, what in the overall elasticity largely of elasticity of the elastic core thread corresponds.

The conductive Fibers such as carbon fibers, nickel-coated carbon fibers, metal fibers or metal fibers with coated polymers have none as single fibers Rigid, and have due to their fine titer largely textile Handle features. To improve the bond between elastic Core thread and conductive Sheath fibers can the Lunten or track bands, which in a usual Spun advancing stage, during the mixing process melt fibers, in a proportion of 5-10% be mixed. By thermal aftertreatment of the elastic, conductive Garnes, which z. B. can be combined with a rewinding, or even while the following textile equipment of the finished fabric happens, the melt fibers reach a plastic state and stick after cooling Core thread and sheath fibers, what the slip resistance of the hybrid yarn considerably elevated, without significantly reducing the electrical conductivities.

Claims (7)

Electrically conductive, elastically extensible hybrid yarn with an elastically extensible core ( 1 ) and one circumference of the core ( 1 ) associated electrically conductive element, which allows an elastic extensibility of the core, characterized in that the electrically conductive element of a fiber cladding ( 2 ), which at least partially covers the core ( 1 ) and electrically conductive short fibers ( 5 ) has a cutting length of 35-60 mm, which are in a composite with each other, obtainable in that the short fibers are connected to the core by the so-called friction spinning method. Hybrid yarn according to claim 1, characterized in that the core of at least one thread ( 4 ) formed by the fiber cladding ( 2 ) is surrounded. Hybrid yarn according to claim 2, characterized in that the at least one thread ( 4 ) of textured polyester or Lycra or the like. Hybrid yarn according to claim 1, characterized in that the electrically conductive fibers ( 5 ) are selected from the group: conductive polyester fibers; Stainless steel fibers; Carbon fibers; metal-coated polymers, silver-plated, copper-plated; nickel-plated carbon fibers and the like. Hybrid yarn according to one of claims 1 to 4, characterized in that the fibers ( 5 ) have a fineness of 1.0-3.3 dtex. Hybrid yarn according to claim 1, characterized in that the electrically conductive short fibers ( 5 ) Melt fibers are mixed. Hybrid yarn according to claim 6, characterized that 5-10% Melt fibers are mixed.