JPH0752280A - Manufacture of shoe - Google Patents

Abstract

PURPOSE:To provide a shoe which has a forming effect, i.e., in which beauty at the time of forming is held even after the shoe is removed from a shoe mold, no shape collapse occurs, the watertight bonding between a vamp and an outsole is sufficient. CONSTITUTION:A vamp 2 is formed by 'a manual vulcanization', the vamp 2 is pulled over a shoe mold 1 by the system, the mold 1 is mounted in an injection molding machine, resin is injected to form an outsole 6, and 'an injection molding' for molding the outsole 6 is integrated to prepare a method for manufacturing the shoe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a shoe in which the "injection molding method" is combined with the "hand vulcanization method" so that the shape retention after the shoe molding is sufficiently performed.

[0002]

2. Description of the Related Art Shoe manufacturing methods are roughly classified into "hand vulcanization method", which is a method of hand-working and vulcanizing, and an injection machine called "injection molding method". There is a method of molding shoes according to. "Hand-cure vulcanization method"
The method for manufacturing shoes according to (1) is mainly a method in which the upper (2) and the rubber outer sole (6) are attached. Generally instep (2)
As for, the unvulcanized laminated fabric is cut into the expanded shape of the instep (2), and then reinforcement, decoration, and the like are attached to manufacture. On the other hand, the insole (4) is manufactured by pasting a cloth material and a rubber sheet together and cutting into a substantially shoe sole shape. Furthermore, after kneading and rolling the rubber for the outer sole (6), the sole design is applied and the unvulcanized sole left to be cut into the shoe sole shape, or the rolled rubber material is pressed with a mold to apply the sole design at the same time. Sulfur is manufactured.

The upper (2) is covered with the shoe mold (1),
The insole (4) is placed on the bottom surface (3) of the shoe mold (1), the lower peripheral edge (5) of the instep cover (2) is suspended, and then the outsole (6) is attached. There are those in which the outer bottom (6) is adhered as they are, and those in which the lower peripheral tape is further adhered. The thus-obtained material was put into a vulcanizing can, and the conditions differ depending on the type of shoes, but for about 60 minutes, 2.5 kg / cm ² ,
It is a method of vulcanizing by pressurizing and heating at 0 ° C, and finally removing the shoe mold (1).

The method called "injection molding system" is a method using a so-called injection molding machine, in which the instep cover (2) is hung on a shoe mold (1) attached to the injection molding machine and the resin is used. This is a method of injecting (16) and molding and adhering the outer bottom (6). At that time, the type of the instep cover (2) used can be roughly classified into two types, a California (slip lasting) system (8) and a string (code lasting) system (9). The instep cover (2) of the California system (8) is a bag-like instep cover (2) in which the lower peripheral edge (5) of the instep cover (2) and the peripheral edge of the insole (4) are sewn together. On the other hand, the instep cover (2) of the string system (9) is a lower peripheral edge for fitting the instep cover (2) into the shoe mold (1) so that the instep cover (2) fits into the shoe mold (1). The method is adopted as the structure of (5).

[0005] The string method (9) will be described in more detail with reference to the method. In the string method (9), the lower peripheral edge (5) of the instep cover (2) is overlocked with a sewing thread over its entire circumference, and a large number of loops (10) are provided. And the string (11) is inserted through these loops (10). Inserted string (1
Both ends (12) of (1) are pulled out to the outside, and after the instep (2) is fitted in the shoe mold (1), the string (1
By pulling both terminals (12) of (1), the lower peripheral edge (5) of the instep (2) is tightened to the shoe mold (1), and the instep (2) is adapted to the shoe mold (1). It was made to be able to.

The above-mentioned instep cover (2) is fitted into and suspended from the shoe mold (1) attached to the injection molding machine, and the shoe mold (1), the lateral mold (13), and the sole. Each mold of the mold (14) is assembled, and thermoplastic resin or polyurethane resin is injected into the void (15) formed by the assembly to mold the outer bottom (6).
It is a method of bonding.

[0007]

In the product manufactured by the "hand vulcanization method", the instep and the outer bottom or the lower peripheral tape are pressure-bonded with glue, but the reinforcement of the instep, decoration, etc. There is a step at the adhesion part, and the adhesion of the lower peripheral tape may not be sufficient. In such a case, when wearing it in severe wear (unusual wear, for example, when you bend your heels) or in severely changing weather conditions (such as severe cold, snowfall, heavy rain, etc.),
A portion of the tape portion where adhesion is insufficient may be slightly peeled off, and water or the like may enter, which causes an unfavorable problem from the viewpoint of waterproof airtightness.

[0008] Further, the unevenness of the hook due to the suspension hinders sufficient adhesion of the bottom, and after the adhesion of the bottom, the unevenness appears on the surface of the bottom and adversely affects the foot contact, which is not preferable in appearance. In order to solve this, it was necessary to devise a method to prevent the unevenness of the suspended wall and the bottom core from forming a step.

In the case of the product by the "injection molding method",
The instep cover is fitted and suspended in the shoe mold attached to the station provided on the turntable of the injection molding machine, the resin is injected, and the finished shoe is removed from the shoe mold. Cycle is as short as 2 to 3 minutes and is a "hand vulcanization method"
The time is 30 to 1/20 of that of the above method. Therefore, it is difficult to provide a sufficient molding effect, that is, a shape-retaining property (the phenomenon of "laughing" in which the mouth opening spreads sideways tends to occur). To prevent this, a core material of a thermoplastic resin (counter ) Has been tried, but the problem has been solved by pre-injection molding (heat setting), etc. The present invention has been made to solve these drawbacks.

[0010]

[Means for Solving the Problems] As means for solving the above problems, a so-called "shoe mold" is formed by covering an instep, placing an insole on the bottom of the shoe mold, and suspending the lower peripheral edge of the instep. After vulcanizing after injecting a thermoplastic resin by the "injection molding method" to mold and bond the outer sole to the instep cover by "hand-cure vulcanization method", or after vulcanizing the instep cover after completing the above hanging And "injection molding method"
Provides a method of manufacturing a shoe by injecting polyurethane resin to mold and adhere the outer sole.

[0011]

[Examples] Normally, the shoe mold (1) of the "hand vulcanization method" and the shoe mold (1) of the "injection molding method" are completely different, but the shoe mold used in the present invention (1) is manufactured so that it can be used for both types, and is attached to an injection molding machine.
It has a structure that can be freely removed. An embodiment of the present invention is one in which the method described in the claims and the first and second claims is carried out, and each of which is schematically shown as a) and b) is as follows.

The steps up to hanging the instep cover (2) and the insole (4) in the shoe mold (1) in the above methods a) and b) are the same as those described in the prior art. The method is almost the same as that of the "method", and generally, as the instep cover (2), an unvulcanized laminated fabric is used to cut into the developed shape of the instep cover (2), while as the insole (4), a cloth material and a rubber sheet. It is manufactured by pasting together and cutting it into a shoe bottom shape. The instep cover (2) thus manufactured is covered with the shoe mold (1), the insole (4) is placed on the bottom surface (3) of the shoe mold (1), and the lower peripheral edge of the instep cover (2) ( 5) is suspended. The following steps are divided as shown in the above-mentioned model, a) and b).

First, the manufacturing method of the model a) is as follows. The shoe mold (1) with the instep (2) suspended is attached to an injection molding machine, the resin (16) is injected, and after a few minutes (injection molding). Machine cycle time) and put in a vulcanizer for 30 minutes, 2.5 kg /
Pressurize and heat at cm ² and 130 ° C. The post-vulcanization method of vulcanizing after such injection molding is the resin (16) for the outer bottom (6).
A thermoplastic resin is used. The reason is that in the case of polyurethane resin, vulcanization for a long time tends to cause yellowing of the polyurethane resin and deterioration of the material. If a polyurethane resin is used for the bottom material of the post-vulcanization method, low temperature and long time vulcanization are required.

In the production method of the model b), the shoe mold (1) in which the instep cover (2) is suspended is put into a vulcanizing can, and the glue and the insole ( After vulcanizing the unvulcanized rubber sheet used in 4), it is attached to an injection molding machine to inject a polyurethane resin and removed after the cycle of the injection molding machine. In such a pre-vulcanization method in which vulcanization is performed before injection molding, since the outer bottom (6) is not molded, the hanging portion (7) rises due to vulcanization heat and peeling easily occurs. Therefore, it is not suitable for those with a hard instep (2) or thick one. The material for the outer sole (6) may be either thermoplastic resin or polyurethane resin because it is injection-molded after vulcanization.

[0015]

[Effect] The greatest object of the present invention is to maintain the molding effect, that is, to maintain the beautiful shape at the time of molding even after the shoe removal mold, which is difficult with the "injection molding method". On the other hand, the bottom in the "hand-cure vulcanization method",
This is to prevent water leakage due to insufficient adhesion of the tape portion. That is, by combining the advantages of the "hand-applied vulcanization method" and the "injection molding method", it is possible to eliminate the drawbacks of both methods.

[0016] First, by pressing and heating the instep while it is still fitted in the shoe mold, the instep fits well into the shoe mold and exhibits the same shape-retaining effect as a general hand-applied shoe. , It keeps its beautiful shape for a long time even after removing the shoe mold, and prevents the mouth of shoes, which is commonly known as "laughing", from spreading sideways. Furthermore, it is not a method of sticking a rubber bottom as the outer bottom after suspending the instep, but a method of injecting resin by injection molding. The outer bottom and the instep are adhered sufficiently to inject and fill, and the airtightness is excellent and the occurrence of peeling is small and water does not enter. Furthermore, since the outer bottom is injection-molded from above the unevenness of the suspended upper cover, the unevenness of the false part does not appear on the grounded bottom surface of the product and does not hit the foot. Therefore, the appearance is beautiful and the product value is significantly improved. In addition, unvulcanized rubber and rubber sponge can be used for the insole, moon mold, toecap, etc. because there is a vulcanization process that shoes that are only injection-molded. It is possible to use these materials that were not possible. In addition, since the outer bottom is made of resin, the vulcanization time can be shortened and the productivity can be improved.

[Brief description of drawings]

FIG. 1 is a diagram of a manufacturing method of the present invention.

FIG. 2 is a partial view of a “hand-applied vulcanization method” instep cover.

FIG. 3 is a partial view of an “injection molding type” California type instep cover.

FIG. 4 is a partial view of an “injection molding type” string type instep cover.

[Explanation of symbols]

 1 shoe mold 2 instep 3 bottom 4 bottom insole 5 bottom rim 6 outer bottom 7 ISE 8 California method 9 string method 10 loop 11 string 12 terminal 13 horizontal 14 bottom 15 void 16 resin

Claims (2)

[Claims] 1. A shoe mold (1) is covered with an instep (2), a bottom (3) of the shoe mold (1) is placed with an insole (4), and the instep (2) is below. A method for manufacturing shoes in which the peripheral edge (5) is suspended, set in an injection molding machine, and then a thermoplastic resin is injected to mold / bond the outer sole (6) and vulcanize. 2. A shoe for molding and adhering an outer sole (6) by injecting polyurethane resin after setting the instep cover (2) according to claim 1 on an injection molding machine after vulcanization. Manufacturing method.