JPH07124005A - Production of slide zipper - Google Patents

Abstract

PURPOSE:To securely prevent a fray at a cut end for a long time, by simultaneously molding by extrusion both fitting insertion tool for opening or closing and reinforcing part having an extended part at the end of the tooth row of a zipper tape and welding the extended part to a welding warp thread to attach the reinforcing part and cutting the extended part at the base thereof along the end of reinforcing part. CONSTITUTION:Reinforcing parts 11 are attached on zipper tapes 3 at the side of a case bar 8 and a screw bar 9. Two extended parts 13, 13 are extruded to mold them together with the reinforcing parts 11 as a unit from the ends 12 of reinforcing parts 11. Two welding warp threads 6 are woven respectively instead of warp threads of the basic cloth at two positions of the zipper tape 3. The welding warp threads 6 are made of synthetic fibers having the same or lower melting point with the thermoplastic synthetic resin of the extended part 13. The extended part 13 is welded with the welding warp thread 6 to weld the weft crossing with the welding warp thread 6 and the extended part 13 is firmly stuck to the zipper tape 3. In this stringer 1, the base of the extended part 13 is cut along the end 12 of the reinforcing part 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a slide fastener provided with a separable bottom end stop, and more particularly to prevention of fraying during cutting at a reinforcing portion.

[0002]

2. Description of the Related Art Conventionally, as a device for preventing fraying of a cut end portion of a slide fastener, for example, as shown in JP-B-55-33883, a reinforcing blade for injection molding together with a separable bottom end stop is used. A plurality of rod-shaped extensions parallel to the longitudinal direction of the fastener tape are simultaneously injection-molded on the outer edge, and the fastener tape is melt-cut at the base of the extension to bond the cut ends to prevent fraying. What was done was known.

[0003]

The above-mentioned fray prevention means is one in which an extension portion is injection-molded on the outer edge portion of the reinforcing blade, and the fastener tape is melt-fused at this base portion to prevent fray of the cut end portion. However, since the cut end is simply the welded end of the fastener tape, the effect of preventing fraying cannot be expected for a long period of time.
Further, since the fastener tape is densely woven in the extension portion, the molten resin does not penetrate much between the threads of the fastener tape at a pressure of about the injection pressure, so the adhesive strength to the fastener tape is weak and peeling is easy. However, it is difficult to expect the raveling prevention effect of the extension portion, which is a problem. Therefore, the present invention is intended to provide a method for manufacturing a slide fastener which can eliminate the above-mentioned problems and reliably prevent the cut end of the fastener tape from being frayed by a simple method over a long period of time. is there.

[0004]

In order to achieve the above-mentioned object, the present invention comprises an extending portion provided in a warp of a fastener tape so as to project from a reinforcing portion which is injection molded simultaneously with a separable bottom end stop. Manufacturing process of a fastener tape that weaves by inserting welded warp made of synthetic fiber yarn having a low melting point equal to or lower than that of synthetic resin into multiple places, and the end of the coupling row attached to the side end of this fastener tape. The split part and the reinforcing part having a plurality of extending parts provided so as to project on the welded warp threads inserted into the fastener tape at a plurality of positions are simultaneously injection-molded to the extending part. Of the separable bottom end stop and the reinforcing part for integrally attaching the reinforcing part to the welded warp and attaching the reinforcing part, and a long stringer to which the separable bottom end stop and the reinforcing part are attached is provided on the reinforcing part. Cut along the edge of the reinforcement at the base of the exit Cut end by the inclusion of a cutting step of a short slide fastener Te is that to be able to produce a slide fastener which does not fray over time.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a long stringer 1 manufactured by the manufacturing method of the present invention, which is cut into a short slide fastener product as shown in FIG. A stringer 1 shown in FIG. 1 has a core string 7 provided at opposite ends of a pair of left and right fastener tapes 3 and a thermoplastic synthetic resin such as polyester, polypropylene, polyacetal, or polyamide is injection-molded to form a coupling tooth 2 in a predetermined shape. A space 16 is provided between the teeth having a predetermined length and not provided with the teeth 2, and a front end 17 is provided with a top stop 17 and a rear end. Has
A box pin 8 is attached to one side, and a butterfly pin 9 is attached to the other side together with a reinforcing portion 11 by injection molding of the same thermoplastic synthetic resin as that of the coupling tooth 2. The reinforcing portion 11 is attached to the side of the box pin 8 and the insert pin 9 on the fastener tape 3 to retain and reinforce the end portion after cutting, and is formed in a four-letter shape. There is. Two extending portions 13, 13 are provided so as to project from the front end portion 12 of the reinforcing portion 11 in parallel with the length direction of the fastener tape 3. The extending portion 13 is formed integrally with the reinforcing portion 11 by injection molding, and is provided so as to be disposed on the welded warp yarn 6 as shown in FIGS. 1 and 2. FIG. 2 is an enlarged view of a portion to which the extending portion 13 of FIG. 1 is attached. The fastener tape 3 is formed by weaving warp threads 4 and weft threads 5 of polyester processing thread, and has one side edge. Is tooth 2
The core string 7 for mounting is woven. In place of the warp yarns 4 of the base cloth, two weld warp yarns 6 are respectively woven in two places of 1/3 of the width of the fastener tape 3, and these weld warp yarns 6 are heated by the heat of the extending portion 13. A synthetic fiber yarn having a melting point equal to or lower than the melting point of the plastic synthetic resin is used. When the extension portion 13 is injection-molded, the fusion warp 6 is melted by the heat of fusion and the extension portion 13 and the fusion warp yarn 6 are welded to each other. The weft yarn 5 intersecting with 6 is welded and the extending portion 13 is firmly adhered to the fastener tape 3 so as not to be easily peeled off. A polypropylene yarn, a nylon yarn, or a low melting point polyester yarn is used as the welding warp yarn 6, and the extended portion 1
A synthetic fiber yarn made of a synthetic resin of a different type from the synthetic resin of 3 may be used, but better fusion can be easily obtained by using a synthetic fiber yarn made of the same type of synthetic resin. The number, size and position of the extending portions 13 and the number of the welding warps 6 to be welded to the extending portions 13 should be appropriately selected as necessary in consideration of the strength of the fastener tape 3 and the appearance of the cut ends. You can

A separable bottom end stop such as a box pin 8 and an insert pin 9 and an extension portion 1
The stringer 1 to which the reinforcing portion 11 provided with 3 is attached by injection molding has the extending portion 13 as shown by the line AA in FIG.
The base portion 14 of the reinforcing member 11 is cut along the end portion 12 of the reinforcing portion 11 by a normal cutter, and the extending portion 13 is welded to the warp 6
Then, the front portion is discharged as a short product, the rear portion is sent out for a predetermined length, and cut at the line AA as before. Then, as shown in FIG. 3, the pair of cut stringers 1 are inserted through the sliders 15 to engage the engaging teeth 2, and the box 10 is attached to the box rod 8 and the insert pin 9 so that one slide fastener Finished into a product. In addition, although the above-mentioned embodiment explained the slide fastener with the separable bottom end stop which is injection-molded with the synthetic resin, the same applies to the slide fastener with the separable bottom end stop of the coil type, zigzag type, and weave type. Is applicable to.

[0007]

EFFECTS OF THE INVENTION The present invention has the above-described structure, and the warp yarns of the fastener tape are provided with several welding warp yarns made of synthetic fiber yarns having a low melting point equal to or lower than the melting point of the extending portion of the reinforcing portion. At this time, the extended portion of the reinforcing portion is provided so as to project on this welded warp, and the extension and the welded warp are welded during injection molding.Therefore, the extension causes the weft that causes fraying together with the welded warp. Welding and firmly adhering to the fastener tape, it is possible to reliably prevent the fraying of the cut end portion of the fastener tape after cutting and to maintain the fraying prevention effect for a long period of time, and also when cutting the fastener tape, high frequency, Without using cutting means such as ultrasonic waves, it is possible to manufacture slide fasteners with a fray prevention effect by cutting with a normal cutter, etc. Ming is one having equal excellent effect that can be in a simple way by inserting a welding warp fastener tape to produce a slide fastener holding long-term reliable fraying prevention effect.

[Brief description of drawings]

1 is a plan view of a stringer produced by the method of the present invention. FIG.

FIG. 2 is an enlarged plan view of the fastener tape showing a portion to which the extending portion is attached.

FIG. 3 is a plan view of a slide fastener manufactured by the method of the present invention.

[Explanation of symbols]

 1 stringer 3 fastener tape 4 warp 5 weft 6 welded warp 8 box bar 9 insert pin 11 reinforcement part 13 extension part 14 base part

Claims (1)

[Claims] 1. A synthetic fiber yarn having a low melting point equal to or lower than that of a synthetic resin forming an extension portion protruding from a reinforcement portion injection-molded simultaneously with a separable bottom end stop in a warp yarn of a fastener tape. A manufacturing process of a fastener tape which is woven by inserting plural welding warps into a plurality of places, and a separable bottom end stop at an end of a coupling tooth row attached to a side end of the fastener tape,
Reinforcement part having a plurality of extending portions protrudingly provided so as to be located on the welded warp threads inserted in a plurality of places of the fastener tape is simultaneously injection-molded, and the extended portions are integrally welded to the welded warp threads for reinforcement. The process of forming the separable bottom end stop and the reinforcement part where the part is attached, and the long stringer to which the separable bottom end stop and the reinforcement part are attached is attached to the end of the reinforcement part at the base of the extension part provided in the reinforcement part. A method of manufacturing a slide fastener including a cutting step of cutting along a portion to obtain a short slide fastener.