JPH0714363B2 - Method for manufacturing shoes having a reinforcing portion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an efficient method for manufacturing shoes which partially require a reinforcing portion such as a toe portion or a heel portion.

(B) Conventional technology As is well known, shoes have some parts such as toes and heels that require a high degree of shape retention. Especially, depending on the application, more reliable reinforcement may be required. There is. For example, in work safety shoes, it is necessary to insert a reinforcing member made of iron or plastic having a strength comparable to that of the toe into the toe.

Conventionally, as a means for efficiently mounting this type of shape retainer or reinforcing body, for example, as disclosed in JP-A-62-221302, polystyrene, polyvinyl chloride, polyvinyl acetate are used as a base fabric. A sheet material that integrates thermoplastic resin materials such as or a sheet material that integrates hot-melt type adhesive components such as polycaprolactone is temporarily attached to a predetermined part of the shoe lace before molding, heat-softening-forming After the mold, a method of cooling is adopted.

In addition, a toe core or a heel core obtained from a sheet obtained by multilayer-bonding an ethylene-vinyl acetate copolymer resin on a natural or synthetic fiber cloth is sewn to the toe core portion or the heel core portion of a cloth shoe or a polyvinyl chloride shoe lace, Japanese Patent Application Laid-Open No. 48-19341 proposes a method in which the toe core or the heel core is adhered or fused, and the toe core or the heel core is molded and solidified by heat applied during the manufacturing process of the shoe (JP-A-48-19341).

In the simultaneous manufacturing method of fiber reinforced composite material insole with shank, when manufacturing the insole of the shoe which uses the fiber reinforced composite material as the shank element, the pre-cut shank material prepreg is preliminarily attached to the insole material. It has been proposed that an insole preform is prepared, which is heated under pressure while maintaining a large number of stacked forms via a release material such as a release paper to cure the resin to bond and integrate it ( JP-A-54-94950).

A toe for shoes made of carbon fiber reinforced resin has been proposed which is formed by molding a fiber reinforced resin composed of carbon fiber or a fiber reinforced material containing carbon fiber and a resin (Japanese Utility Model Application No. 60-1).
Microfilm of No. 65370 (Japanese Utility Model Publication No. 62-73706).

(C) Problems to be Solved by the Invention However, this conventional technique has the following problems.

That is, in the above items and, the one made of a thermoplastic resin is used as the reinforcing member, and this thermoplastic resin has essentially low strength and hardness. Therefore, in this type of reinforcing member, the required strength and hardness are required. As a result, it has been impossible to form a required reinforcing portion on the toe portion, that is, a reinforcing portion made of iron or having a strength comparable to that of the above-mentioned work safety shoes.

For this reason, it is necessary to increase the thickness of the reinforcing member in order to impart the required strength to the toe portion using this reinforcing member,
If the thickness of the reinforcing member is excessively thick in this manner, not only the molding work of the shoe becomes extremely difficult, but also the head becomes a stiff shoe, not only the aesthetic appearance is impaired but also warping increases the risk of working. There are fatal issues such as being unable to serve.

Further, in the above and in, a thermoplastic resin material such as polystyrene, polyvinyl chloride, polyvinyl acetate or the like or a hot melt type adhesive component such as polycaprolactone or ethylene-vinyl acetate copolymer resin is used,
If the temperature of these materials and components does not drop to about 25 to 40 ° C, the plasticity remains and the shape collapses. Therefore, it is necessary to wait for the temperature of the last to drop after the heating process before die cutting. For this reason, after the shoe is molded, it is necessary to cool naturally while the last is attached, so that the number of work-in-process products increases and the manufacturing efficiency is remarkably reduced. In order to solve this, it is necessary to perform forced cooling using a cooling device, but this requires an extra device and increases equipment costs, and also requires a cooling process, increasing the number of processes and increasing the number of processes. There is a problem that it becomes extremely uneconomical, such as requiring personnel.

On the other hand, the above is one in which a shank material is preliminarily attached to the insole of the shoe to form an insole preparatory body, and this is subjected to pressure heat treatment collectively, such as work safety shoes. It is not meant to reinforce the shoes themselves.

Further, the above is related to a carbon fiber reinforced resin toe strap that constitutes the toe part of the shoe, and is formed by molding a fiber reinforced resin composed of carbon fiber or a fiber reinforced material containing carbon fiber and resin. However, like the above case, it is not for reinforcing the shoe itself like work safety shoes.

The present invention has been completed in order to solve the above technical problems, and when manufacturing shoes that partially reinforce the toe part, the heel part, etc. at once, a thermosetting shoe as a reinforcing material for the shoe. A method of manufacturing a shoe having a reinforcing portion that secures the required strength at the toe and heel of the shoe by using the reinforcing prepreg sheet, and further reduces the number of production steps to improve productivity and economy. The purpose is to provide.

(D) Means for Solving the Problems The present inventor solves the above problems and, in order to manufacture shoes having a reinforcing portion at once, uses the thermosetting resin which has been difficult to use in the past. I paid attention.

That is, the temperature required for vulcanization of soft rubber compounding members such as rubber soles and auxiliary tapes in the shoe making process, and shaping treatment of the covering material is 120 to 130 ° C. for 60 to 20 minutes for the former and 60 to 20 for the latter. 90
60 to 20 minutes at ℃, the curing temperature of the thermosetting resin (200 to 150 ℃
It is extremely low temperature and covers a wide range compared to 10 to 100 minutes. It was considered impossible to apply the sharp reaction characteristics of the thermosetting resin under the slow temperature atmosphere peculiar to the shoe manufacturing technical field in view of process control.

The present invention has made extensive studies as to whether or not a prepreg sheet containing a thermosetting resin as a main material exhibits sharp reaction characteristics even in a slow temperature atmosphere peculiar to the shoe-making technical field, and as a result, a specific prepreg sheet is selected. The inventors have found that the materials exhibit sharp reaction characteristics even under the above temperature atmosphere, and have completed the present invention.

That is, the present invention takes the technical means described below in order to achieve the above object.

Hereinafter, the present invention will be described in detail.

A method for manufacturing a shoe having a reinforcing portion according to claim 1 of the present application includes a step (A) of cutting a prepreg sheet into a predetermined shape to form a shoe reinforcing prepreg sheet, and the shoe reinforcing obtained in the step (A). The step (B) of temporarily fitting the prepreg sheet to a predetermined portion of the shoe cover and fishing in the last, and hardening the shoe reinforcement prepreg sheet caught in the step (B) by a predetermined heating step such as heat setting and vulcanization. In the method for producing a shoe, which comprises the step (C), the prepreg sheet is formed of a thermosetting resin, and the thermosetting resin is mainly composed of an epoxy resin and / or a polyester resin. It is characterized by that.

In these steps (A) to (C), the prepreg sheet in which the thermosetting resin is in a semi-cured state is cut into a predetermined shape to obtain a shoe reinforcing prepreg sheet, and the shoe reinforcing prepreg sheet is applied to a shoe cover. After fitting it to the specified part temporarily and fishing it into the last, the specified heating process such as heat setting and vulcanization (temperature 60
After 60 to 10 minutes at ~ 150 ° C), the prepreg sheet for shoe reinforcement softens moderately in this heating process, so it fits well on a unique curved surface with a small curvature, such as the last toe. Then, even under a slow temperature atmosphere peculiar to the above-mentioned shoe-making technical field, a curing reaction occurs to form a reinforcing portion having sufficient strength, and shoes such as work safety shoes having the required reinforcing portion can be obtained. .

In the method for manufacturing a shoe having a reinforcing portion of the present invention, particularly, the prepreg sheet is formed of a thermosetting resin, and the thermosetting resin is mainly composed of an epoxy resin and / or a polyester resin. It has been done.

The prepreg sheet preferably used here is SB
-E, SB-T, SB, SEGT, SEGTT, SENB, SEPS, SE-PE
T, SP, SP-K, SP-E, SP-CE, SPX, SP-FTF, SKT, EG
One or two or more selected from the group consisting of L, XP, LAC, FPC, sylbon (all are trade names or symbols of prepreg sheets manufactured by Shinko Chemical Industry Co., Ltd.) and their equivalents The thing which laminated | stacked the above is mentioned.

As the thermosetting resin used in the present invention, those containing an epoxy resin and / or a polyester resin as a main component are exemplified.

In the present invention, the prepreg sheet is cut into a predetermined shape to form a shoe-reinforcing prepreg sheet. By using such a shoe-reinforcing prepreg sheet, a desired portion of the shoe is reinforced to a required strength. You can do it.

A method for manufacturing a shoe having a reinforcing portion according to claim 2 of the present application is characterized in that, in the above-mentioned manufacturing method, a resin layer containing an epoxy resin as a main component and the resin layer are cured on the surface of the cloth in which the prepreg sheet is impregnated or coated with the phenoxy resin. And the hot-melt adhesive component are contained in at least one of the above layers.

The phenoxy resin used in the present invention refers to a polymer resin having an average molecular weight of usually 10,000 to 100,000.

Examples of the cloth used in the present invention include inorganic fibers such as glass fibers, woven cloth and non-woven cloth made of chemical fibers such as polyester and heat resistant nylon.

Furthermore, as the epoxy resin used in the present invention,
A bisphenol type epoxy resin having a molecular weight of 300 to 4000 and an epoxy equivalent of 140 to 550 is suitable, and if necessary, a novolac type epoxy resin, an alicyclic epoxy resin and the like may be used alone or in combination.

The above curing agent is preferably an imidazole type curing agent, but in addition to this, a polyamide resin or an amine type curing agent may be used alone,
Alternatively, they may be used together.

Examples of the heat-melting diaphragm include powder polyethylene, polyvinyl chloride, ethylene-vinyl acetate copolymer and the like.

Further, as the hot melt adhesive component, a copolymerized polyamide resin, a methoxymethylated polyamide resin, a powdered polyethylene resin, a butyral resin or the like can be used alone or in combination of two or more thereof.

In the method for manufacturing a shoe having a reinforcing portion according to claim 3 of the present application, the cloth is made of carbon fiber in the above manufacturing method.

By using the cloth made of carbon fiber as described above, the cloth can be used as an electric heating means.

In the method for manufacturing a shoe having a reinforcing portion according to claim 4 of the present application, in the above manufacturing method, the reinforcing portion is a toe portion and / or a heel portion, and the shoe is a work safety shoe.

This work safety shoe can be said to be a typical application example of the present invention.

(E) Action The present invention has the above-mentioned configuration and uses a specific prepreg sheet mainly composed of a thermosetting resin as a reinforcing member that partially reinforces a required portion such as a toe portion or a heel portion of a shoe. This particular prepreg sheet develops remarkable strength and hardness by heating and curing, and since it is in a semi-cured state, it has the action of expressing sharp reaction characteristics even in the slow temperature atmosphere peculiar to the shoemaking technical field. is there.

(F) Examples Hereinafter, the present invention will be described in detail based on Examples, but the present invention is not limited thereto.

Example 1 Using cordley SC3901 (trade name and part number of tephra coating material manufactured by Teijin Cordley Co., Ltd.) as the covering material, a lightweight sports shoe type light work shoe (size of which secures the safety of the toe part)
In making 25.0 cm, white) the invention was carried out as follows.

A shoe reinforcing prepreg sheet cut according to the shape of the toe reinforcing cloth on the back side of the toe part of the shoe lace that is cut by the usual method (Silbon T-56, product name and item number , Epoxy resin) and a thin cotton cloth on top of it
The prepreg sheet for shoe reinforcement was temporarily fixed by pressing for 5 seconds with a heat fusion machine at ℃.

Next, put the armor cover in a heating chamber and heat it at about 80 ° C for 15 minutes to make the toes particularly soft and fish into the aluminum last, and attach the rubber bottom, rubber tape, etc. according to the usual method,
Put in a hot air vulcanizer, 130 ℃, 60 minutes, air pressure 3.5kg / cm ²
After heating and vulcanizing under the conditions described above, after cooling with a blower for about 30 minutes, the last was removed, and an athletic shoe type light work shoe having impact resistance at the toe part was obtained.

When this light work shoe was placed on an iron plate and a steel ball of 10 kg was dropped from the height of 1 m to the tip of the toe, a depression of about 5 mm occurred and no other damage was seen.

Example 2 Using Clarino 1205 (trade name and product number of Kuraray Co., Ltd. as a covering material) as a covering material, a prepreg sheet (EGL-6) was prepared when a three-piece sneaker (size 25.0 cm, red) was manufactured. Shinko Kagaku Kogyo Co., Ltd. product name and product number, epoxy resin) according to Example 1, one on the toe part, another two on the heel part, and the hot pot temperature
The prepreg sheet was temporarily fixed by press-bonding each for 5 seconds with a heat fusion machine at 85 ° C.

Next, put this covering in a heating chamber and heat it at about 80 ° C for 10 minutes to make the toes and heels particularly soft and fish into the aluminum last, and then heat setter (Italy: heat setter manufactured by anzani). ) At 140 ℃
After heating for 20 minutes and heat setting, attach the outer bottom by a normal method using a normal temperature type adhesive, remove the last about 10 minutes, remove the last, and clean the toe part and heel part three pieces I got a sneaker of sword type.

(G) Advantageous Effect of the Invention The present invention has the above-mentioned configuration and is a specific prepreg mainly composed of a thermosetting resin as a reinforcing member that partially reinforces specific required places such as a toe and a heel of a shoe. This particular prepreg sheet develops remarkable strength and hardness by heating and curing, and because it is in a semi-cured state, it exhibits sharp reaction characteristics even in the slow temperature atmosphere peculiar to shoemaking technology. As a result, the required strength can be ensured in the toe part and heel part of the shoe, and the hardening is performed to reduce the number of production steps and improve the productivity and economical efficiency of the high-strength shoe.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-48-19341 (JP, A) JP-A-54-94950 (JP, A) Actual development-Sho 62-73706 (JP, U) JP-B Sho-51- 48778 (JP, B2) JP 60-47689 (JP, B2) "Reinforced Plastic Handbook" edited by Technical Association of Reinforced Plastics, Sho 50-5-15 Published by Nikkan Kogyo Shimbun. 15-34P. 92 ~ 93

Claims (4)

[Claims] 1. A step (A) of cutting a prepreg sheet into a predetermined shape to form a shoe-reinforcing prepreg sheet, and the shoe-reinforcing prepreg sheet obtained in the step (A) at a predetermined portion of a shoe cover. A step (B) in which the shoe reinforcing prepreg sheet is fished in the last step, and a step (C) in which the shoe reinforcing prepreg sheet fished in the step (B) is cured by a predetermined heating step such as heat setting and vulcanization. In the manufacturing method, the prepreg sheet is formed of a thermosetting resin, and the thermosetting resin is composed mainly of an epoxy resin and / or a polyester resin. Manufacturing method. 2. A prepreg sheet is provided on a surface of a cloth impregnated or coated with a phenoxy resin, with a resin layer mainly containing an epoxy resin and a curing agent layer for curing the resin layer separated from each other by a heat-melting diaphragm. The method according to claim 1, wherein at least one of the layers contains a hot-melt adhesive component. 3. The method for manufacturing shoes according to claim 2, wherein the cloth is made of carbon fiber. 4. The method for manufacturing a shoe according to claim 1, wherein the reinforcing portion is a toe portion and / or a heel portion, and the shoe is a work safety shoe.