JPS6058843B2 - Method for manufacturing conductive boots - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the manufacture of conductive boots that can prevent electrical hazards such as explosion accidents caused by the behavior of static electricity, production failures due to damage to electronic parts, and electric shocks caused by dynamic electricity. Regarding the method.

It is generally known that in order to prevent these disorders, it is sufficient to use a conductive material with an appropriate electrical resistance value in the sole of the shoe, and to maintain electrical continuity between the sole and the wearer's foot. There is.

In particular, for static electricity hazards, we aim to lower the electrical resistance value, and for both static and dynamic electrical hazards, we aim to prevent the accumulation of static electricity, and to increase the allowable current value for dynamic electrocution. The electrical resistance value is set so that it is less than or equal to the value. Prior art for manufacturing conductive shoes based on these findings includes, for example, using a midsole fabric with holes drilled in it, and integrating the shoe covering material with the midsole fabric by sewing.
One method was to hang this in the last, cover it with side and bottom molds, and inject a conductive material for forming the sole of the shoe to expose the conductive material from the hole in the midsole. However, although this type of shoemaking technology can be used to manufacture short shoes, it cannot be applied horizontally due to the problems associated with manufacturing rain boots. The problem is that the stitching between the elastic lining fabric, such as stockinette or tricot, which is preferred when manufacturing and wearing boots, and the inner sole fabric of the above structure wrinkles and does not work as expected, or it may hang up. The problem is that the sewn parts of the lining fabric may tear when it is worn. The present invention has been made to solve these problems, and is intended for workplaces that dislike static electricity, workplaces that dislike static electricity and desire to be safe from dynamic electricity, etc. An object of the present invention is to provide an extremely efficient method for manufacturing conductive boots suitable for personal use.

The gist of the present invention is to provide an insole in which a conductive sheet-like lower base material is provided on one side of a sheet-like upper base material having a cutout portion penetrating through the thickness direction, and a gate bag-like lining fabric having elasticity as the last. , the insole is positioned between the last and the lining cloth, and the sheet-like upper base material of the insole is facing the last side, and then the covered last is covered with an outer mold, The method for manufacturing conductive boots includes forming a desired space between the last and the outer mold, and then injecting an injection molding material into the space so that at least a portion of the sole of the space exhibits a desired electrical resistance value.

The sheet-like upper base material, which is one of the components of the insole used in the present invention, may include fabric materials such as woven fabrics and non-woven fabrics that have holes or cutouts that penetrate through the thickness. A material impregnated or coated with synthetic resin, a synthetic resin sheet, etc. can be used.

The other conductive sheet-like lower base material is made of a synthetic resin sheet that is compatible with the injection molding material using conductive synthetic resin, applying conductive ink, etc., using conductive thread, etc. A woven or woven fabric with conductivity can be used. Further, as the stretchable bag-like lining used in the present invention, knitted or woven fabrics such as woven fabrics made of tricot, knitted, or spun yarns can be used. The manufacturing method of the present invention will be explained below in order. The inner sole is made by laminating and integrating the sheet-like upper base material and the conductive lower base material with adhesive or the like, which has the above structure, and then applies adhesive or the like to the inner bottom of the elastic lining fabric, which is made into a bag shape by sewing or the like. The inner sole can be hung on the last so that it is located between the last and the lining cloth to cover it, or the inner sole can be temporarily hung on a hanging device such as a pin installed at the bottom of the last. After that, a bag-like lining fabric is hung to cover the inner sole and the lining fabric. At this time, the sheet-like upper base material of the insole must be on the last side. Particularly when using the latter covering method, the positioning of the insole during covering is reliable, and the lining fabric can be hung smoothly. This method is superior to the former coating method in terms of product quality and work process because it eliminates the need for an adhesion process. Next, this coated last is covered with an outer mold, and a molding space for the torso, the lace, the sole of the shoe, etc. is formed between the last and the outer mold.

Next, an injection molding material such as rubber or synthetic resin is injected into this space, and at least in the sole of the shoe, a conductive injection molding material with a desired electrical resistance value is injected, or a conductive injection molding material with a different electrical resistance value is injected. A plurality of four injection molding materials are combined and injected to form a multilayer structure to exhibit a desired electrical resistance value. An example of this conductive injection molding material is a plasticizer (a phthalate-based primary plasticizer, an alkylbenzene-based secondary plasticizer, an adipic acid-based polymer plasticizer, etc.) alone or as a mixture for 10 parts of polyvinyl chloride resin. )0~130
Parts by weight, antistatic agent (cationic, anionic, nonionic surfactants and combinations thereof) 0.1~
Examples include a blend containing 10 parts by weight of a stabilizer, a lubricant, a pigment, etc. in appropriate amounts.

As a result of this injection, in the parts of the lining fabric that are not in contact with the insole, that is, the torso and the collar, the last is located immediately behind the lining fabric, so the injection molding material seeps into the lining fabric, but The injection molding material hardly seeps into the inner surface of the fabric, making it possible to integrate it with the lining fabric while ensuring the quality of the appearance and feel of this area. On the other hand, in the part of the lining fabric that is in contact with the inner sole, because the last is not immediately located behind the lining fabric and the inner sole is located, the injection molding material passes through the lining fabric, and the conductive sheet-like base reach the material. If this conductive sheet-like lower base material does not have any voids on the surface or inside that allow injection molding material to infiltrate, such as a synthetic resin sheet, it will be joined at this boundary, and if it has no voids such as a cloth material, If the material has the following properties, the injection molding material will penetrate and, depending on the selection of the sheet-like upper base material, further penetrate into the upper base material, thereby integrating the sole, lining cloth, and midsole. Also, due to this injection pressure, the conductive sheet-like lower base material located under the defective part of the sheet-like upper base material is pushed up to the surface of the sheet-like upper base material. The lower substrate alone or in the form of a conductive sheet and the injection molding material are exposed. This ensures electrical continuity between the sole and the wearer's foot. Further, the conductive sheet-like lower base material in the present invention is located on the upper surface of the sole and serves as an upper electrode, so that the electrical resistance value set in the sole can be reliably utilized.

As described above, according to the present invention, conductive boots that can prevent problems caused by static electricity and electrodynamics can be efficiently manufactured in a simple process while ensuring sufficient conductive performance.

Examples are shown below. Example 1 (See Fig. 1) A hole with a diameter of 10 Wr1n penetrating in the thickness direction was made in the stepping part and the heel part of the sheet-like upper base material 1 made of a short woven cloth cut into the shape of a foot, and a hole with a diameter of 10Wr1n was made in the same way on one side of this. Apply carbon ink, which is the cut conductive sheet-like lower base material 2, from both sides (coating amount: 2
00y/a) and conductive cheesecloth (thread grain: 1 ha, number of threads: 15 in both length and width) is hot-melted to the inner sole 3, which is attached to the last 4 and the pin 5 at the bottom of the sheet-like upper base material 1. Temporarily attach it so that it is on the last 4 side.

Next, a knitted lining fabric 6 sewn into a bag shape is hung and covered with an outer mold 7 to form spaces for molding the body part 8, the lace part 9, and the sole part 10. Next, an injection molding material All having the following composition was injected into this space and molded. The electrical resistance of the boots obtained in this way was measured based on the test method 6.1.2 of JIS-T-8103.
It showed a value of 90MΩ to 35Ω in the C filter temperature range, and had electrical characteristics that matched the intended workplace. Example 2 (See Figure 2) Using the same inner sole 3 and bag-like lining fabric 6 made of the sheet-like upper base material 1 and lower base material 2 as in Example 1, urethane was applied to the inner bottom of the bag-like lining fabric 6. The inner sole 3 is pasted with adhesive, and this is hung on the last 4 which has a small protrusion 15 on the outer surface of the lace. After fitting the protector 16 made of a steel plate, the outer mold 7 is used to cover the trunk. A molding space for the part 8, the lace part 9, and the sole part 10 is formed.

Next, injection molding material Bl2 having the following composition is placed in this space.
was injected and molded. The boots obtained in this way are J
When the electrical resistance value was measured based on the test method in 6.1.2 of IS-T-8103, it showed a value of 95 MΩ to 50Ω in the temperature range of 52C to 35℃, which indicates that the electrical properties match the intended workplace. It was hot.

Example 3 (See Figure 3) Using the same inner sole 3 and bag-like lining fabric 6 made of the sheet-like upper base material 1 and lower base material 2 as in Example 1, the last 4 was made in the same manner as in Example 1. The inner sole 3 is covered with a bag-like lining fabric 6.

Next, this is covered with an outer mold 13 consisting of a side mold 22 and a bottom mold 23 to form a molding space for the body part 8, the lace part 9, and the upper thin layer sole part 14. Next, the injection molding material B12 used in Example 2 is injected into this space. Next, the bottom mold 23 of this outer mold is released, and another outer mold, the bottom mold 20, is set to form a molding space for the lower sole 21, and the injection molding material All used in Example 1 is filled in this space. The boots thus obtained were molded by injection molding.
When the electrical resistance value was measured based on the test method in 2, it was 5℃.
It showed a value of 90 MΩ to 90 MΩ in the temperature range of 35° C., and had electrical characteristics that matched the intended workplace.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, and FIG. 3 are explanatory diagrams showing different examples of the embodiment of the embodiment. 1... Sheet-like upper base material, 2... Conductive sheet-like lower base material, 3... Middle sole, 4... Last, 6... ... Back 5 cloth, 7, 13, 20...
... Outer mold, 11, 12... Injection molding material.

Claims (1)

[Scope of Claims] 1. An insole in which a conductive sheet-like lower base material is provided on one side of a sheet-like upper base material having a cutout extending through the thickness direction, and a bag-like lining fabric having elasticity as the last, The insole is positioned between the last and the lining fabric, and the sheet-like upper base material of the insole faces the last side, and the coated last is covered with an outer mold. A method for manufacturing conductive boots, comprising forming a desired space between a last and an outer mold, and then injecting and molding an injection molding material into the space so that at least a sole portion of the space exhibits a desired electrical resistance value. 2. A method for manufacturing conductive boots according to claim 1, wherein the inner sole is temporarily attached to the last and then covered with a lining fabric.