JPH0453522B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding a plastic slide fastener, and more particularly to a method for molding the slide fastener and integrally attaching its elements along the edge of a fabric such as clothing.

Plastic sliding fasteners of this type are produced independently of the object to which they are attached, for example clothing. For this reason, a slide fastener sewing process always exists in the manufacturing process of clothing and the like. Currently, such sewing work is performed manually using an industrial sewing machine, which is quite a laborious work and is a factor that increases the price of the product. Furthermore, since the sewing machine needle penetrates the fabric during this sewing process, the waterproof performance of the sewn portion tends to decrease.

Therefore, an object of the present invention is to perform the step of molding the slide fastener and the step of attaching the slide fastener to the cloth at the same time, thereby omitting the work of attaching the fastener by sewing.

Based on the above object, the present invention integrates the elements of the slide fastener directly onto the fabric to which the slide fastener is attached by injection molding, and uses the heat of the plastic or the mold during injection molding to A heat-melting tape is melted between the cloths, and the molded element, patch cloth, etc. are firmly integrated with the cloth.

Hereinafter, the method of the present invention will be specifically explained based on the drawings.

First, FIG. 1 shows a positioning process.
In this positioning step, a pair of left and right outer fabrics 1 to which the slide fasteners are to be attached are positioned on the lower mold 2 with their edges folded back in a U-shape, for example. At this time, a thermofusible tape 3 is interposed inside the folded portion of the cloth 1, and a tape-shaped padding cloth 4 is applied to the inside portion of the folded portion of the cloth 1 as required. In this way, preparations before injection molding are completed.

Next, FIG. 2 shows the injection process of the fastener element 5. That is, the plastic material 6 in the molten state is injected from the nozzle 7 of the injection molding machine, and is injected into the upper and lower molds 2 at a molten temperature, and is supplied into the space connected to the liner 6a. be done. At this time, the molten plastic material 6 sandwiches the cloth 1, tape 3, and patch cloth 4 under injection pressure. Moreover, the heat of the molten plastic material 6 is immediately transferred to the cloth 1, tape 3, and patch cloth 4.
The melting temperature of the plastic material 6 is, for example, around 200 degrees, and the melting temperature of the thermofusible tape 3 is
It is set approximately equal to or less than that. For this reason, the tape 3 is made of plastic material 6.
It melts under the heat of
The element 5 is integrally fixed to the cloth 1. In this manner, in the injection process of the element 5, the cloth 1 is integrated with the injection-molded element 5 by thermal melting of the tape 3. Note that this heat may be obtained by heating the upper and lower molds 2. In this way, a pair of left and right elements 5
are integrally formed on the edge portion of the cloth 1 while being connected at the liner 6a. Thereafter, the upper and lower molds 2 of the split mold are separated, and the integral fabric 1 and element 5 are taken out from inside the mold 2.

Subsequently, the fabric 1 and the element 5 are sent to a cutting process, as shown in FIG.
It is separated at the part. As a result, the left and right elements 5 are integrally formed along the edges of the pair of left and right cloths 1.

These elements 5 are then sent to the grooving process shown in FIG. Here, a groove 8 is formed in a portion of the opposing surface of the element 5. This groove 8 is sized to fit into a projection 9 formed on the side surface of the element.

In this way, the pair of left and right elements 5 are integrally formed along the edge of the cloth 1 and attached thereto. A slider 10 is then combined with these elements 5 in the same manner as in the prior art. Due to this movement of the slider 10, the pair of left and right elements 5 engage with each other, as shown in FIG. 5, and the left and right fabrics 1 are joined together. In this combined state, the grooves 8 fit into the corresponding protrusions 9, so that the engaged elements 5 do not shift in the direction perpendicular to the cloth 1.

Note that the above embodiment shows an example in which the tape 3 and the patch cloth 4 are applied along the edge of the cloth 1, but
FIG. 6 shows an example in which the lining 11 is similarly folded back in a U-shape with respect to the cloth 1, and a U-shaped thermofusible tape 3 is interposed in the folded portion. In this case, the tape 3 welds the cloth 1 as the outer material and the lining 11 to the element 5, and
This is effective for integrating the lining 11 with these.

In the above embodiment, the cloth 1 is made of a woven cloth, but the cloth 1 may of course be made of, for example, synthetic leather or bonded fabric.

In the present invention, since the process of forming the fastener elements is also the process of fixing these elements to the edge of the fabric, the conventional process of sewing the slide fastener to the fabric can be omitted, and the slide fastener can be attached to the outer fabric. Because it is firmly bonded to objects such as materials, it can prevent fraying and water from entering, and the heat of the molten plastic material melts the thermofusible tape, which is then fixed to the outer material. The joints between them become stronger and are sufficiently reinforced.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the positioning process of the present invention, Figure 2 is a sectional view of the positioning process of the present invention;
The figure is a cross-sectional view of the injection process, Figure 3 is a cross-sectional view of the cutting process, Figure 4 is a cross-sectional view of the grooving process, Figure 5 is a plan view of the fitted state of the elements, and Figure 6 is a cross-sectional view of the joining part. FIG. 1... Cloth, 2... Mold, 3... Heat-melting tape, 4... Patching cloth, 5... Element, 6... Plastic material, 7... Nozzle of injection molding machine, 8
...Groove, 9...Protrusion, 10...Slider, 11
……lining.

Claims (1)

[Claims] 1 Apply heat-melting tape along the edges of the pair of left and right fabrics to which the slide fastener is to be attached, and inject molten plastic along the edges of the fabric and the tape to attach the elements of the slide fastener. The tape is molded integrally with the edge of the cloth and the tape, and the tape is thermally melted by the heat of the molten plastic during injection.
A method for molding and attaching a slide fastener, characterized in that the fabric and the molded element are integrated with a tape in a heat-molten state.