JP2005534821A - Fabric webbing manufacturing method - Google Patents

Abstract

A method for producing a woven belt band comprising warp and at least one weft for a safety belt, particularly a vehicle, is disclosed. In the weaving step, a multi-fiber yarn composed of separate fibers is used as a weft, the fiber is composed of a core surrounded by a fusible film, and the woven belt band is woven. A heat treatment is performed after the process. The multi-fiber yarn is melted into a wavy shape to form a single-fiber spring elastic single yarn body, the cross resistance of the belt is increased, and the multi-fiber yarn is bonded to the warp.

Description

  The present invention relates to a method for producing a woven webbing consisting of warp and at least one weft, in particular for a seat belt of a vehicle such as an automobile.

  Problems with webbing manufacturing methods and webbing are known in many variations. Typically, such webbing warp yarns are composed of multifilament yarns. However, the weft yarn consists of a multifilament yarn only or a monofilament yarn alone or a combination of a multifilament yarn and a monofilament yarn. The production of webbing with only multifilament yarn wefts has the disadvantage that there is little stiffness and elasticity in the cross machine direction (CD). Although the webbing obtained by the single fiber weft exhibits the necessary CD stiffness and elasticity, when the wear progresses and breaks at the so-called reversal position, the single fiber weft protrudes sharply from the end of the webbing like a saw blade, It has the disadvantage of damaging the occupant's clothing and damaging the position of the torso and neck. Apart from this, webbing made from single fiber weft material is bulkier than webbing made only from multi-fiber material.

  The present invention is based on the object of proposing a method for producing a textile webbing which avoids or at least greatly reduces the disadvantages of the prior art.

  This object is achieved by the method according to claim 1. This method makes it possible for the working of the multifilament yarns in the weft direction to achieve a preferred structure at the keying point of the woven fabric. Each individual fiber of the multifilament yarn consists of a core covered by a fusible coating. This yarn (hereinafter simply referred to as “two-element yarn”) is woven in the weft direction and forms a flexible oval and flat tether at the end of the shed. This is not feasible with monofilament yarns. During manufacture, according to the present invention, the multifilament yarns are heated after weaving, and the fibers of the multifilament yarns are bonded together by the fusion of the fusible coating, so that the corrugated multifilament yarns are uniform. It becomes an elastomer single fiber type yarn body to increase the CD stiffness of the webbing.

  The above-described process of adjusting mechanical properties to achieve the desired CD stiffness and flexibility is achieved using corrugated yarns, and the thickness of the fabric webbing is reduced because the tip of the tether is less noticeable. The surface of the webbing formed by warps becomes smooth.

  As described above, since the webbing is manufactured by the multi-filament yarn structure of the weft and the warp according to the present invention, a flexible inversion portion flattened in an elliptical shape is realized at the edge portion. Damage to the end of the webbing due to abrasion of the weave end no longer has the saw blade effect of concern or the negative consequences envisaged from the prior art.

  One advantageous feature of the method according to the invention is that the multifilaments and the outgoing fibers are further bonded to the warp yarns that interweave at the tether points during thermosetting to achieve a higher CD solidification of the webbing. Is to make it possible.

  Another advantageous feature according to the invention is that the polyamide is used as the coating and the polyester as the core, resulting in an optimal harmonious close bond in webbing.

  In yet another advantageous feature according to the invention, polyester is used for both the warp multifilament yarn coating and the core. This further has the great advantage of increasing the degree of recycling. In this case, the polyester coating is produced from a so-called E polymer treated polyester.

  In a textile sheet produced by heat treating a two-element yarn at about 220 ° C. with the method according to the present invention, the individual fibers are bonded together and the mechanical properties (elastic response, low fluffiness, stiffness) of the single fiber yarn are Having a monofilament yarn body is achieved in the weft. Thus, all the advantageous features of multifilament and monofilament yarns are combined in the method and product according to the invention.

  The method according to the invention is naturally compatible with all known types of webbing. The benefits that can be initially achieved are thinner webbing, smoother webbing surface, gentle inversion at the edge, elastic responsiveness, CD stiffness and perfect surface finish.

  Advantageously, multifilament yarns having a coating to core mass ratio ranging from about 20% to about 80% to about 30% to about 70% are used as weft yarns.

Claims (9)

  It is composed of warp yarns and at least one weft yarn. In the weaving process, at least one weft yarn is used as a multi-fiber yarn, and the multi-fiber yarn is composed of individual fibers composed of a core covered with a fusible coating. The weft yarn forms a weft reversal portion having tethering points that are flattened in a flexible oval shape at the edge portion, and after the weaving step, the webbing is thermoset to produce a wavy multi-fiber yarn. A method of manufacturing a webbing such as a woven belt strap for a seat belt of a vehicle or the like, wherein the webbing melts as a uniform elastomer single fiber type yarn body and the CD stiffness of the webbing increases.   The method of claim 1, wherein after weaving, the webbing is thermoset to bond the multi-fiber yarn to the warp.   3. A method according to claim 1 or 2, characterized in that polyamide is used for the coating and polyester is used for the core.   4. A method according to claim 1, 2 or 3, characterized in that polyester is used for the coating and the core.   The method of any one of claims 1 to 4, wherein the coating to core mass ratio ranges from about 20% to about 80% to about 30% to 70%.   At least one weft is woven by a width of a portion of the warp, and a second weft is hooked with the at least one first weft while being woven across the entire width of the webbing A method according to any one of claims 1 to 5.   6. A method according to any one of the preceding claims, characterized in that the webbing is woven into a circular salvage.   6. A method according to any one of the preceding claims, characterized in that the webbing comprises further yarns at its edge portion.   9. A method according to any one of the preceding claims, characterized in that the weft yarn is interwoven with tack yarn and / or sealing yarn at its edge.