JPH11156961A - Injection-molded boots and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pair of boots, the ornamental tape part of which is finished by a hand-made touch and, at the same time, in which boot sole and boot main body are effectively prevented from separating from each other, and its manufacturing method in the injection-molded boot equipment with the ornamental tape part at the boundary part between the boot sole and the boot main body. SOLUTION: In an injection-molded boots, in which a boot sole 2 and a boot main body 3 are formed into an integral body by injecting the boot main body 3 at the upper part of the boot sole 2 after the boot sole 2 is injection- molded and, at the same time, an ornamental tape part K is formed near the joint between the boot sole and the boot main body, a flange part 2k is molded from the upper edge part of the peripheraledge of the boot sole 2 so as to extend sidewise and, at the same time, a band-like projecting part 3k is molded at the sideway periphery of the boot main body 3 and the ornamental tape part K is formed by joining the under surface (d) of the stepped part of the projecting part 3k with the upper surface of the flange part 2k.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection-molded boot having an injection-molded shoe sole, an injection-molded shoe body, and a decorative tape portion protruding near a boundary between the shoe sole and the shoe body. It relates to the manufacturing method.

[0002]

2. Description of the Related Art Conventionally, as a technique for manufacturing boots, for example, a rubber sole member and a plurality of rubber sheet members serving as a shoe main body are separately formed, and the respective members are bonded and integrated. A hand-made total rubber shoe is known which sticks decorative tape so as to cover the joint along the boundary between the shoe sole and the main body, and improves the joint strength and the design. Since it is difficult to mass-produce such a hand-made product, boots are known in which a shoe sole is injection-molded, and then a shoe body is injected into an upper portion of the shoe sole to integrate the two. .

[0003] Such boots 51 are formed into, for example, a shape as shown in FIG. 7. For example, after a shoe sole 52 is injection-molded by a bottom mold (not shown), a bottom mold for holding the shoe sole 52 and a not-shown bottom mold are used. A shoe body molding space is defined by a side mold or the like, and a shoe body material is injected into this space to form a shoe body 53 integral with the shoe sole 52, and at the same time, by a groove formed in the side mold. A decorative tape portion 53k having a ridge shape is formed, and the lower surface d of the step portion of the decorative tape portion 53k is joined to the upper end surface of the peripheral portion 52e of the shoe sole 52.

[0004]

However, in the above-described injection-molded boots 51, the outer surface of the decorative tape portion 53k and the outer surface of the shoe sole 52 are substantially flush with each other. There is a problem of inferiority. On the other hand, the sole 5
2 by reducing the thickness of the peripheral portion 52e,
a step between the outer surface of k and the outer surface of the peripheral portion 52e;
Although it is possible to project the entire decorative tape portion 53k outward, in this case, the bonding area between the upper surface of the peripheral portion 52e and the lower surface of the step portion of the decorative tape portion 53k is reduced, and the peel strength of the bonding portion is reduced. Be disadvantaged.

Accordingly, the present invention is effective in preventing the detachment of the sole and the shoe body from the sole of the shoe sole by finishing the decorative tape portion as if it were handmade in an injection-molded boot in which the sole and the shoe body are divided into two stages and injection-molded. It is an object of the present invention to provide a boot and a method for manufacturing the same.

[0006]

To achieve the above object, according to the present invention, a shoe sole and a shoe body are integrated by injection molding, and a decorative tape portion is provided on the outer periphery along the vicinity of the boundary between the two. In the injection molded boots formed in the shape of a ridge, the decorative tape portion is formed by projecting laterally from the band-shaped protruding portion protruding around the side surface of the shoe body and the upper edge of the peripheral edge of the shoe sole; The protruding portion is formed of a flange portion joined to the lower surface of the step portion, and the outer surface of the protruding portion of the shoe body and the outer surface of the flange portion of the shoe sole are made substantially flush.

As described above, the flange portion is extended from the upper end of the peripheral edge of the shoe sole, and the upper surface of the flange portion is joined to the lower surface of the step portion of the projecting portion of the shoe body, and the outer surface is flush with the decorative tape portion. With this configuration, the decorative tape portion protrudes from the periphery and can be finished with a handmade feeling, and when the decorative tape portion is bent due to walking or the like, the peeling load applied to the joint between the shoe sole and the shoe body is reduced. And it becomes difficult for both to peel off.

That is, as shown in FIG. 6 (B), considering the case where the decorative tape portion 53k is bent in the direction shown by the dashed line, in the case of the conventional structure, only the shoe main body 53 mainly bends largely and largely. Since the bottom 52 is hardly bent, the peeling load applied to the joint is large. However, in the present invention, since the flange portion of the shoe sole bends following the shoe body, the peeling load applied to the joint is reduced.

Here, as the injection molding material for the shoe sole and the shoe body, various commonly used materials such as various elastomers and thermoplastic rubbers can be applied, and the materials for the shoe sole and the shoe body may be different. However, if the materials are of the same kind, they are suitable because they are firmly integrated.

[0010] According to a second aspect of the present invention, a plurality of minute projections for increasing the bonding strength with the shoe body are formed at predetermined locations on the upper surface of the flange of the shoe sole. In this manner, if the minute projections are formed on the upper surface of the flange and the shoe body is injected so that the minute projections are wrapped by the shoe body material, the bonding strength is further improved by the anchor effect. Here, the minute protrusion may be provided on the entire upper surface of the flange portion, or may be provided locally particularly at a portion where the shoe sole and the shoe body are likely to peel off.

According to a third aspect of the present invention, in the method for manufacturing an injection-molded boot having a decorative tape portion, a sole-forming space is defined by matching a bottom mold or the like, and then a sole material is filled in the space. Injecting to form the shoe sole, at this time, by forming a flange portion that becomes a part of the decorative tape at the upper edge of the peripheral edge of the shoe sole by a concave groove engraved on the peripheral edge of the bottom mold, and then, Form the shoe body molding space by matching the side mold etc. on the held bottom mold,
Inject the shoe body material into this space to mold the shoe body,
At this time, a band-shaped protruding portion which is joined to the upper surface of the flange portion of the shoe sole and becomes the remaining portion of the decorative tape is formed by a concave groove formed in the peripheral portion of the side mold.

As described above, if the shoe sole and the shoe body are integrated by two injection moldings of the shoe sole injection molding and the shoe body injection molding,
There is no need to make major changes to existing manufacturing equipment, only light changes such as engraving grooves in each mold.

[0013]

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 is an overall view of an injection-molded boot according to the present invention, FIG. 2 is a cross-sectional view of a joint between a shoe sole and a shoe body, FIG. 3 is a process diagram showing an example of a molding method, and FIG. FIG. 5 is an example of the shape of the minute projection formed on the upper surface of the portion, FIG. 5 is an example of the shape of the minute projection, and FIG. 6 is an operation diagram showing the state of the joint when the shoe is bent.

The injection molded boots according to the present invention are, for example, shown in FIG.
The boots 1 provided with the decorative tape portion K as shown in FIG.
Injecting and molding in two parts of the shoe body 3 and
The purpose is to finish the decorative tape portion K as if it were made by hand, and at the same time, to make the shoe sole 2 and the shoe body 3 hard to peel off, and the joint portion between the shoe sole 2 and the shoe body 3 is particularly characterized.

That is, as shown in FIG. 2, the decorative tape portion K is a band-shaped projecting portion 3 protruding from the side surface of the shoe body 3.
k, and a flange portion 2k formed to project laterally from the upper end of the peripheral edge of the shoe sole 2 and joined to the lower surface d of the step portion of the projecting portion 3k, the outer surface of the projecting portion 3k and the flange portion 2k. The outer surface is flush. Therefore, in appearance,
The decorative tape portion K protrudes from the surroundings, giving a feeling of being handmade. Incidentally, a backing material 4 is provided on the back side of the shoe body 3.

A method for forming such an injection molded boot 1 will be described with reference to FIG. First, as shown in FIG. 3 (A), a sole-on-surface mold 11 which is a dummy mold is matched with an upper portion of a bottom mold 10 to define a shoe sole molding space portion 12, and an elastomer or a space is formed in the space portion 12. The sole 2 is formed by injecting a sole forming material such as thermoplastic rubber. At this time, since the concave groove 10c for forming the flange 2k is engraved on the entire periphery of the bottom mold 10, the flange 2k is formed simultaneously with the formation of the shoe sole 2.

When the sole 2 is formed on the bottom mold 10, the sole-on-surface mold 11 is removed as shown in FIG. 3B, and the side mold 13 is replaced as shown in FIG. Mold 14 in which the backing material 4 is suspended
Are formed, and a shoe body molding space portion 15 is defined above the shoe sole 2. Then, the shoe body molding material is injected into this space portion 15, and the shoe body 3 is molded. At this time, a concave groove 13c for forming the protruding portion 3k is engraved in the peripheral edge portion of the side mold 13 corresponding to the upper portion of the flange portion 2k of the shoe sole 2, and the protruding portion 3k is formed at the same time when the shoe body 3 is formed. Is formed, and the upper surface of the flange portion 2k is joined and integrated with the lower surface d of the step portion of the projecting portion 3k.

The joint structure between the sole 2 and the shoe body 3 of the boots 1 formed as described above is effective in preventing the both from coming off.
That is, as shown in FIG. 6 (A), for example, when a bending force is applied to the decorative tape portion K in the direction shown by the chain line during walking or the like, the protrusion 3k of the shoe body 3 and the flange portion of the shoe sole 2 2
k is bent integrally, and the peeling load applied to the joint is small.

A boot 51 of a conventional structure as shown in FIG.
And the boots 1 according to the present invention were subjected to a sole bending test and a peeling test. As a result, the conventional boots 51 began peeling at a time of 400,000 times, which is an OK area for practical general performance. In the case of the present invention, no peeling was observed up to 1,000,000 times, and it was confirmed that the shoe has high durability, for example, for work shoes used under severe conditions. Incidentally, in this shoe sole bending test, the ball girth part (stepped bent part) where the most bent part of the joint part occurs is fixed in the shape of a shoe, and at a temperature of 23 ° C., the bending direction is repeated in the walking direction. Then, the reciprocating bump was bent at an angle of 50 degrees, and the number of times of peeling of the joint was tested.

When the shoe sole 2 is formed, a plurality of minute projections t,... May be formed at predetermined positions above the flange 2k as shown in FIG. These small projections t,... Are engaged so as to be embedded in the material of the shoe main body 3 when the shoe main body 3 is injected, and the separation is effectively prevented by the anchor effect.

Incidentally, the minute projections t are formed by the sole-on-surface mold 11, and the shape may be a simple projection as shown in FIG. 5A, or as shown in FIG. 5B. As described above, a shape in which finer notches i,... Further, the forming portion may be provided over the entire area on the upper surface of the flange portion 2k, or may be provided locally at a portion which is particularly easily peeled. When the minute projections t,... Are formed in this manner, the peel strength of the joint can be further increased.

The present invention is not limited to the above embodiment. Those having substantially the same configuration as those described in the claims of the present invention and exhibiting the same operation and effect belong to the technical scope of the present invention. For example, the shape of the minute projections t is arbitrary.

[0023]

As described above, according to the present invention, in forming the decorative tape portion, a strip-shaped protruding portion projecting from a side surface of the shoe body and a peripheral upper end portion of the shoe sole are provided. The decorative tape part protrudes from the periphery and can be finished with a handmade feeling, and the decorative tape part bends with walking etc. When doing so, the peeling load applied to the joint between the shoe sole and the shoe main body can be reduced, and both can be hardly peeled off. Further, if a plurality of minute projections for increasing the bonding strength with the shoe body are formed at predetermined locations on the upper surface of the flange portion of the shoe sole, the peeling strength can be further improved. If manufacturing is performed by the method as described in claim 3, for example, it is not necessary to largely change existing manufacturing equipment, and only a simple change such as engraving a concave groove in each mold is required.

[Brief description of the drawings]

FIG. 1 is an overall view of an injection molded boot according to the present invention.

FIG. 2 is a cross-sectional view of a joint between a shoe sole and a shoe body.

FIG. 3 is a process chart showing an example of a molding method.

FIGS. 4A and 4B are diagrams illustrating an example in which minute protrusions are formed on the upper surface of a flange portion of a shoe sole, wherein FIG. 4A is a plan view and FIG.

FIG. 5 is a diagram showing an example of the shape of a minute projection, in which a left side is a side view and a right side is a plan view.

6A and 6B are action diagrams showing a state of a joint portion when a shoe is bent, where FIG. 6A is the present invention and FIG. 6B is a conventional example.

FIG. 7 is a cross-sectional view of an example of a conventional joint between a shoe sole and a shoe body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Injection molding boots, 2 ... Sole, 2k ... Flange part, 3 ...
Shoe body, 3k ... projecting part, 10 ... bottom mold, 10c
... concave groove, 12 ... shoe sole forming space portion, 13 ... side mold, 13c ... concave groove, 15 ... shoe body forming space portion, K ... decorative tape portion, d ... stepped portion lower surface, t ... minute projection portion.

Claims (3)

[Claims] 1. A shoe sole and a shoe body are integrated by injection molding,
An injection-molded boot having a decorative tape portion formed in a protruding ridge on an outer periphery along a vicinity of a boundary between the both, wherein the decorative tape portion is a band-shaped protruding portion protruding around a side surface of the shoe main body. And a flange formed so as to protrude laterally from a peripheral upper end portion of the shoe sole and joined to a lower surface of the step portion of the projecting portion, and an outer surface of the projecting portion of the shoe body and the shoe sole. The outer surface of the flange portion is substantially flush. 2. A boot according to claim 1, wherein a plurality of minute projections are formed at predetermined locations on the upper surface of the flange portion of the shoe sole to increase the bonding strength with the shoe body. And injection molded boots. 3. A method for manufacturing an injection-molded boot having an ornamental tape portion, comprising the steps of: matching a bottom mold or the like to define a sole-forming space; and forming a sole in the sole-forming space. Molding the shoe sole by injecting the material, at this time, by forming a flange portion which becomes a part of the decorative tape at the upper end of the peripheral edge of the shoe sole by a concave groove engraved on the peripheral portion of the bottom mold,
A step of forming a shoe body molding space by molding a side mold or the like on a bottom mold holding the shoe sole, and injecting a shoe body material into the shoe body molding space to form a shoe body, At this time, the method includes a step of forming a strip-shaped projection that is joined to the upper surface of the flange portion of the shoe sole and becomes a remaining portion of the decorative tape by a concave groove engraved on a peripheral portion of the side mold. Injection molding boots manufacturing method.