JP2564804Y2 - Injection molded shoe shell with insole - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection-molded shoe cap with an insole, the inner sole of which is sewn to a lower part of a cap with a lower thread and an upper thread.

[0002]

2. Description of the Related Art A California-type cap that is manufactured by injection molding is sewn with a sewing thread composed of a lower thread and an upper thread by protruding a seam allowance of the cover and a seam allowance of the midsole downwardly into a palm. (Hereinafter, this will be referred to as the “insole-covered cap”). In the manufacture of this California shoe, an insole with a midsole is hung on the last, this last is fitted to the side mold and the bottom mold, and then into the injection molding gap formed between the last and both molds. The company manufactures shoes by injecting injection molding materials.

When the insole with the insole is suspended last, the insole with the insole is extended so as not to be wrinkled and suspended on the last. As a harmful effect at this time, there is a problem that a sewing hole is formed between the insole and the shell and a sewing thread is formed, and a gap is formed between the sewing thread and the injection molding material leaks out into the shoe from the gap. When the injection-molded material seeps into the shoe, the comfort of the shoe is impaired, and the appearance of the shoe is deteriorated. In particular, when the color of the inner surface of the shoe of the insole and the upper is different from the color of the injection molding material, the spot-like exudate is conspicuous in the shoe, which significantly reduces the commercial value of the shoe.

Conventionally, as a means for solving such a problem, there has been known a method in which a sewing hole such as a latex or a paste of polyvinyl chloride is used to seal each sewing hole and injection molding is performed. However, this method is extremely time-consuming, and even if a sealing device is developed, a high cost cannot be avoided.

Therefore, as another conventional means, for example, the one described in Japanese Utility Model Application Laid-Open No. Sho 62-159704 filed by the present applicant is known. As shown in FIG. 5, when the insole 101 is sewn to the lower part of the shell 100, a narrow band made of a cushion material such as wool is formed on the outer surface of the sewn portion 101a of the insole 101. Body 102
Are sewn while interposing the sewing hole 103 in the insole 101.

[0006]

By the way, the sewn portion is sewn on the outer surface of the sewn portion 101a of the insole 101 so as to cover the sewing hole 103 of the insole 101. Is to prevent only the bleeding of the injection molding material Z from the gap of the sewing hole 103, and the bleeding of the injection molding material Z from the gap of the sewing hole 104 of the cover 100 is not yet solved. . Therefore, similarly, on the outer surface of the sewing portion 100a of the shell 100,
It is conceivable to cover the sewing hole 104 of the upper cover 100 by sewing with the interposition of, but there are many cases where the thickness of the tape portion 105a of the sole 105 cannot be sufficiently obtained from the viewpoint of shoe design, In the case of such shoes, there is a new problem that the strip-shaped body 102 is exposed from the surface of the tape portion 105a of the manufactured shoe.

The present invention is based on the background of the prior art, and has an inner sole which can prevent the injection molding material from leaking into the shoe through the gap between the upper cover and the inner bottom sewing hole. An object of the present invention is to provide an injection molded shoe cap.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to an injection-molded shoe jacket in which the insole is sewn to the lower portion of the jacket with a sewing thread consisting of a lower thread and an upper thread. at least one of, Ri Do usually yarn and the thermal bonding fusible yarn, the heat-bonding solvent
The melting temperature of the melted yarn is the melting temperature 18 of the injection molding material for shoe soles.
Set at 50-160 ° C, which is lower than 0-210 ° C
The present invention provides an injection-molded shoe cover with an insole, characterized in that a shoe cover is used.

[0009]

According to the present invention, according to the present invention, the injection-molded shoe cover with the insole is
When the shoe is manufactured by injecting the injection molding material into the injection molding gap formed between the last in which the insole is sewn to the last, the side mold and the bottom mold,
The heat of the injected injection molding material melts the heat-bonded molten yarn and closes the sewing hole in the insole and the upper, thereby causing the injection molding material to seep into the shoe from the gap between the inner bottom and the sewing hole in the upper. Can be prevented.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 2, the injection-molded shoe cover with the midsole according to the present invention has the seam allowance of the cover 10 and the seam allowance of the midsole 20 projecting downward in a jointed manner, so that the midsole 20 is positioned at the lower part of the cover 10. The sewing machine 30 is sewn with a sewing thread 30.

The shell 10 and the midsole 20 are provided by cutting a general shell material and a midsole material into predetermined dimensions.
The sewing thread 30 is composed of a lower thread 31 on the shell 10 side and an upper thread 32 on the midsole 20. As shown in FIG. The upper thread 32 is made of a normal thread, while a pair of two threads is used. Lower thread 3
As the one ordinary thread 311, for example, a cotton thread, a nylon thread, a Tetron thread, etc., which is normally used for sewing of the 30th thread, is used. Note that the thickness of the thread is not limited to 30th.

Further, the heat bonding molten yarn 312 has 900 d
e, a thermal bonding yarn "Flor M3" (manufactured by Kanagawa Corporation) is employed. This yarn is made by spinning a hot melt yarn (special nylon resin) developed by Unitika Ltd. for sewing. In the case of dry heat, shrinkage starts at 70 ° C, maximum shrinks at 110 ° C, 122 ~ While melting starts at 125 ° C, shrinkage starts at 40 ° C in the case of wet heat,
It has the thermal property of starting melting at 70 ° C.

The thickness of the heat bonding molten yarn 312 is 90
Not limited to 0de, but 100de or more, especially 300de
is preferably not less than 100 de, and if less than 100 de, the amount of the molten resin is smaller than that of the needle hole, and the effect of closing the needle hole is reduced.

Further, the heat bonding molten yarn 312 is not limited to the heat bonding yarn Flor M3, but has a melting temperature of 50%.
May be a to 1 60 ° C., is less than 50 ° C. too low melt temperature,胛被10 together with the injection molding material Z during the injection molding
Oozing into the shoe from the gap between the sewing holes 11 and the gap between the sewing holes 21 of the insole 20, and the frictional heat generated by the friction with the cover due to the reciprocating movement of the sewing needle during sewing. The heat-bonded molten yarn melts and solidifies on the sewing needle,
The sewing thread could be cut and the sewing could not be performed. on the other hand,
When the melting temperature exceeds 1 6 0 ° C., not sufficiently melted by the heat of the injection molding material Z emitted by the melting temperature is too high, it becomes impossible to cover these sewing holes 11, 21.

The upper thread 32 is composed of the 20th thread and the lower thread 31
The same ordinary yarn as the ordinary yarn 311 is used.
The thickness of the thread need not be limited to 20th.

Thus, the shell 10 in which the inner bottom 20 is sewn by the sewing thread 30 is hung on the last 40 as shown in FIG. 3, and the last 40 fits into the side mold 50 and the bottom mold 60. Is done. Next, a shoe sole molding material Z having a melting temperature of 180 to 210 ° C. is injected into the shoe sole molding gap 70 formed inside the last 40 and the molds 50 and 60 in the fitted state to manufacture a shoe.

At this time, the melting temperature of the heat bonding molten yarn 312 (wet heat 70 ° C.) is the melting temperature of the shoe sole forming material Z (180 °).
4, the heat bonding molten yarn 312 is melted by the heat of the sole molding material Z when the sole molding material Z is injected as shown in FIG. The sewing hole 21 of the insole 20 is closed, thereby preventing the injection molding material Z from seeping into the shoe from the gap between the sewing holes 11 of the upper 10 and the gap between the sewing holes 21 of the insole 20.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and any change in design without departing from the gist of the present invention is included in the present invention. For example, in the embodiments, the twin yarn of the normal yarn and the heat-bonded molten yarn has been described as an example of the lower yarn, but without being limited thereto,
For example, the form of the yarn such as a mixed yarn of a normal yarn and a heat-bonded molten yarn is not limited.

Further, in order to further prevent the injection molding material from seeping into the shoe from the gap of the sewing hole in the insole, the present invention provides a thin strip made of a cushioning material described in the conventional means. It does not prevent use in combination. In addition, if it is a shoe with a space in the thickness of the tape part of the shoe sole,
This strip-shaped body may be provided on the outer surface of the sewing portion of the shell.

In the embodiment, the lower thread of the sewing thread is composed of a normal thread and a heat-bonded molten yarn. However, the present invention is not limited to this. Both the upper yarn and the upper yarn may have a heat bonding molten yarn.

[0021]

[Effect of the invention] The injection molded shoe shell with the insole of the invention is:
In the insole or胛被injection molding shoe胛被which is sewn by sewing thread consisting of lower yarn and the upper yarn at the bottom of at least one of the lower yarn and the upper yarn, Ri Do usually yarn and the thermal bonding fusible yarn, Moreover,
The melting temperature of this heat-bonded molten yarn is
Melting temperature from 50 to 160 ° C, lower than 180 to 210 ° C
Injection molding material is injected into the injection molding gap formed between the last, side mold and bottom mold where the sewn insole is suspended because the set is used. In manufacturing shoes, the heat-bonded molten yarn is melted by the heat of the injected injection-molded material and closes the sewing holes in the insole and the upper, thereby allowing the shoes to pass through the gap between the inner bottom and the sewing holes in the upper. This has the effect of preventing the injection molding material from seeping into the inside.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of a sewn portion of an injection molded shoe upper with an insole according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the injection molded shoe upper with the insole according to the embodiment of the present invention;

FIG. 3 is a longitudinal sectional view showing an injection molding process of the injection molded shoe upper with the insole according to the embodiment of the present invention;

FIG. 4 is a partially enlarged cross-sectional view of the sewn portion of the injection-molded shoe cap with the insole after the injection molding.

FIG. 5 is an enlarged cross-sectional view of a main part of a shoe manufactured using a conventional injection-moulded shoe cap with a midsole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Shell 20 Middle bottom 30 Sewing thread 31 Lower thread 311 Normal thread 312 Heat bonding fusion thread 32 Upper thread

Claims (1)

(57) [Scope of request for utility model registration] 1. An injection-molded shoe jacket in which an insole is sewn to a lower portion of a shell by a sewing thread including a lower thread and an upper thread, wherein at least one of the lower thread and the upper thread is a normal thread and a heat thread. adhesive Ri Do from molten threads, the melting temperature of the heat-adhesive melt yarn, for shoe soles
5 which is lower than the melting temperature of the injection molding material 180 to 210 ° C
An injection-molded shoe shell with an insole, characterized by using a temperature set at 0 to 160 ° C.