JPH05184407A - Method for preparing injection molded shoes provided with cushion material - Google Patents

Abstract

PURPOSE:To provide a method for preparing injection molded shoes attached with cushion material that can be easily and precisely fixed by anyone without requiring training cushion material such as an air bag or at a predetermined position below the midsole of a Californian cover. CONSTITUTION:In attaching a cushion material 53 such as an air bag on the shoe sole, a midsole 52 providing a cushion material 53 on the last mold 10 and a projecting flat surface 31 provided on the upper side of the bottom mold 30 sandwich the cushion material 53.

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 a cushion material such as an air bag is attached to the sole of the shoe by injection molding.

[0002]

2. Description of the Related Art In recent years, cushioning materials such as air bags have been attached to the soles of shoes in order to reduce the weight of shoes and improve their functions.

As a method of mounting a cushion material such as an air bag on the shoe sole, there has been a conventional method in which the cushion material is stored in the recess of the shoe sole and then the shoe sole and the cover are integrated with an adhesive or the like. is there.

[0004]

However, the cushion material and the recess provided in the shoe sole are not always manufactured in the same shape due to their manufacturing errors, and there is a gap between them. , There may be a gap. In that case, if the cushion material is repeatedly expanded and contracted by vigorous exercise, the adhesive may be fatigued and cause delamination.

In order to avoid this, an attempt was made to place a cushion material in the space for molding the shoe sole and to incorporate it in the shoe sole at the time of injection molding. However, since the cushion material is lightweight, the usual injection molding material is used. The injection pressure causes the cushion material to move easily, making it difficult to incorporate the cushion material in a predetermined position where a cushion effect is required.

[0006] After that, a method of fixing the cushion material to a predetermined position on the lower surface of the insole of California with an adhesive, a method of fixing the cushion material to a needle-like projection planted at a predetermined position on the bottom surface of the last mold, and the like have been proposed. However, in the former case, since it takes time for the adhesive to solidify, it is not an efficient method, and considerable skill is required to attach the cushioning material to the predetermined place. To do.

On the other hand, in the case of the latter, it is necessary to suspend the California vine in the last mold before fixing the cushion material to the needle-shaped projections of the last mold. Since it is planted, the work of suspending it in the last mold so as not to damage the California cub by the needle-shaped projections is a painstaking and troublesome work, which leads to a decrease in productivity.

The present invention has been made to solve such a conventional problem, and an object thereof is to provide a cushioning material such as an air bag at a predetermined position on the lower surface of the midsole of a California elephant without requiring any skill. Another object of the present invention is to provide a method for manufacturing an injection-molded shoe equipped with a cushion material that can be easily and accurately fixed.

[0009]

According to the present invention, when a cushioning material such as an air bag is attached to a shoe sole, a convex flat surface provided on the upper side of an insole attached to the last mold and the bottom mold. (EN) A method for manufacturing an injection-molded shoe equipped with a cushion material, which is characterized in that it is sandwiched by a surface.

[0010]

When the cushioning material such as the air bag is attached to the sole of the shoe, the cushioning material is sandwiched between the insole attached to the last mold and the convex flat surface provided on the upper surface of the bottom mold. A cushioning material such as an air bag can be easily and precisely fixed to anyone at a predetermined position on the lower surface of the insole of California without requiring skill.

Further, by supporting the peripheral edge portion of the cushion material by the projection portion provided upright on the upper surface side of the bottom mold, the cushion material placed on the convex flat surface of the bottom mold heated to a predetermined temperature can be provided. It is possible to prevent thermal deformation and peeling of the heat-sealed portion.

Further, by supporting the peripheral edge portion of the cushion material at least by the projection portion formed on the upper surface side of the outsole, the cushion material placed on the convex flat surface of the bottom mold heated to a predetermined temperature. It is possible to prevent thermal deformation and peeling of the heat-sealed portion.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the case where the air bag is sandwiched between the middle bottom of the California vine suspended in the last mold and the convex flat portion provided on the upper surface side of the bottom mold is taken as an example.

In FIG. 1, reference numeral 10 designates a last mold, on which a so-called California vine 50 formed by sewing a lower recording of a cover 51 and a peripheral edge of an insole 52 is suspended. It is embedded. For the covering 51 and the insole 52, any sewable material such as cloth, synthetic resin leather, leather, artificial leather, and synthetic leather can be used.

In order to injection-mold a shoe sole on the lower surface side of the insole 52, the side mold 20 and the bottom mold 30 are combined at the lower portion of the last mold 10 in which the California armor 50 is suspended to form a shoe sole molding gap 60. Form,
At that time, when the cushion material 53 is placed on the convex flat surface 31 provided on the upper surface side of the bottom mold 30 and then the bottom mold 30 is raised to a predetermined position, as shown in FIG. The midsole 52 of the California vine 50 in which 53 is suspended in the last mold 10 and the convex flat surface 31 of the bottom mold 30 can be easily and accurately fixed to anyone without skill.

Next, as shown in FIG. 2, when an injection-moldable injection molding material such as polyvinyl chloride resin or polyurethane resin is injected into the shoe sole molding space 60, the shoe with the cushion material 53 attached to the heel is formed. Molded.

As shown in FIGS. 3 and 4, the cushion material 53 is formed by sealing the cut ends of a plurality of transparent synthetic resin tubes 54 juxtaposed in parallel by heat fusion using a high-frequency welder or a heat mold. at the same time,
These tubes 54 are fixed by heat fusion on a transparent synthetic resin support plate 55, and the whole is covered with a transparent synthetic resin sheet 56. When the cushion material 53 is placed on the convex flat portion 31, as shown in FIG. 1, the cushion plate 53 is placed with the support plate 55 side facing the ground plane.

5 to 7, instead of reducing the supporting area of the convex flat surface 31 provided on the upper surface side of the bottom mold 30, a plurality of protrusions 32 are provided upright around the convex flat surface 31. This is an example in which the peripheral edge portion of the cushion material 53 is supported by. The upper surface of the convex flat surface 31 and the upper surface of the protrusion 32 are located on the same plane.

When the cushion flat member 31 is supported by the convex flat surface 31 having a reduced supporting area of the convex flat surface 31 itself and the plurality of protrusions 32 provided around the convex flat surface 31,
The portion of the bottom mold 30 that is heated to a predetermined temperature and that contacts the convex flat surface 31 is reduced, and thermal deformation of the cushion material 53 and peeling of the heat-sealed portion can be prevented.

8 to 11 show a bottom mold 30.
Instead of reducing the supporting area of the convex flat surface 31 itself, the plurality of projections 31 standing upright around the convex flat surface 31 and the projections 58 formed on the upper surface side of the outsole 57 are used to form the cushion material 53. This is an example in which the peripheral portion is supported.

As described above, the convex flat surface 31 of the bottom mold 30 having a reduced support area of the convex flat surface 31 itself, and a plurality of protrusions 32 and the outsole 57 provided around the convex flat surface 31.
The cushion member 5 is formed by the protrusion 58 formed on the upper surface side of the
By supporting the peripheral edge portion of No. 3, the portion contacting the convex flat surface 31 of the bottom mold 30 heated to a predetermined temperature is reduced, and thermal deformation of the cushion material 53 and peeling of the heat-welded portion can be prevented.

As described above, in order to form the protrusion 58 for supporting the cushion material on the upper surface side of the outsole 57, as shown in FIG. A plurality of protrusion forming recesses 41 are provided.

Then, as shown in FIG. 9, when the injection molding material for the outsole is injected into the outsole molding space 61 formed by combining the dummy mold 40 and the bottom mold 30, the cushion is provided on the upper surface side of the outsole 57. The protrusion 58 for supporting the material is formed.

After removing the dummy mold 40, the convex flat portion 31 and the protruding portion 32 of the bottom mold 30 are removed.
And the cushion material 53 on the protrusion 58 of the outsole
Then, when the bottom mold 30 is raised to a predetermined position, as shown in FIG. 10, the middle bottom 52 of the California sword 50 suspended in the last mold 10, the convex flat portion 31 on the bottom mold 30 side, and the like. The cushion member 53 is fixed by the protrusion 32 and the protrusion 58 of the outsole.

Then, as shown in FIG. 11, an injection molding material for middle sole molding is formed in a middle sole molding cavity 62 formed by the California mold 50 suspended in the last mold, the side mold 20, and the atsoles 57 on the bottom mold. Is injected, a shoe with the cushion material 53 attached to the heel is molded.

In the above embodiment, the effect that the cushion material 53 can be fixed easily and accurately by anyone without requiring any skill is provided, but the support plate 55 side of the cushion material 53 is observed from the outside. Therefore, a secondary effect of excellent fashionability is also obtained.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and modifications and the like within the scope of the invention are included in the present invention. Is.

That is, the cushion material may be installed not only at the heel portion but also at both the heel portion and the tread portion, or at other locations, if desired.

The cushion material is not limited to the air bag, and any member can be used as long as it has elasticity, and may be itself or a composite with another member.

Further, the cushion member may be supported by the convex flat portion of the bottom mold and the protrusion of the outsole without the protrusion of the bottom mold.

[0031]

As described above, according to the present invention, the cushion material is sandwiched between the insole attached to the last mold and the convex flat surface provided on the upper surface side of the bottom mold. A cushion material such as an air bag can be easily and accurately fixed to anyone at a predetermined position on the bottom bottom surface without requiring skill. further,
Since the peripheral edge of the cushion material is supported by the protrusions standing on the upper surface side of the bottom mold, thermal deformation of the cushion material placed on the convex flat surface of the bottom mold heated to a predetermined temperature and It has become possible to prevent peeling of the heat-sealed portion. Further, the peripheral edge portion of the cushion material is supported by at least the projection portion formed on the upper surface side of the outsole. The cushion material placed on the convex flat surface of the bottom mold heated to a predetermined temperature. It has become possible to prevent thermal deformation of the material and peeling of the heat-sealed portion.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a method for manufacturing an injection-molded shoe of the present invention, showing a state in which a cushion material is supported by a convex flat surface of a bottom mold.

FIG. 2 is an enlarged longitudinal cross-sectional view of essential parts showing a state in which a shoe sole injection molding material is injected into a shoe sole void portion.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an overhead view of the IV-IV end surface of FIG. 3.

FIG. 5 is a vertical cross-sectional view showing another embodiment of the injection-molded shoe manufacturing method of the present invention, in which the cushion material is supported by the convex flat surface of the bottom mold and the protrusions.

FIG. 6 is a vertical cross-sectional view showing a state in which a shoe sole injection molding material is injected into a shoe sole void portion.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a vertical cross-sectional view showing still another embodiment of the injection-molded shoe manufacturing method of the present invention, showing a state in which an outsole molding gap is formed by combining a dummy mold and a bottom mold.

FIG. 9 is a vertical cross-sectional view showing a state in which an injection molding material for outsole molding is injected into the outsole void portion.

FIG. 10 is a vertical cross-sectional view showing a state in which the cushioning material is supported by the convex flat surface of the bottom mold, the protrusion, and the protrusion of the outsole.

FIG. 11 is a vertical cross-sectional view showing a state in which a middle sole molding injection molding material is injected into a middle sole void portion.

[Explanation of symbols]

 10 Last Mold 30 Bottom Mold 31 Convex Flat Surface 32 Bottom Mold Projection 52 Midsole 53 Cushion Material 58 Outsole Projection

Claims (3)

[Claims] 1. When mounting a cushioning material such as an air bag on the shoe sole, the cushioning material is sandwiched between a middle sole mounted on the last mold and a convex flat surface provided on the upper surface side of the bottom mold. A method for manufacturing an injection-molded shoe fitted with a cushion material. 2. The method for manufacturing an injection-molded shoe with a cushion material according to claim 1, wherein a peripheral edge portion of the cushion material is supported by a protrusion provided upright on an upper surface side of the bottom mold. 3. The method of manufacturing an injection-molded shoe with a cushion material according to claim 1, wherein a peripheral portion of the cushion material is supported by at least a protrusion formed on the upper surface side of the outsole.