JPH05207903A - Production of injection molded shoe sole - Google Patents

Abstract

PURPOSE:To intensify the joint between the partial shoe soles to be joined to each other by producing the shoe sole consisting of the plural partial shoe soles so as to form the rugged structures to increase joining areas in the adjacent parts of the adjacent partial shoe soles. CONSTITUTION:This shoe sole has an outsole A and a midsole M. The outsole A is formed of the 1st outsole Al and the 2nd outsole A2. The 1st outsole Al is a band-shaped sole covering the outer peripheral part of the ground contact surface of the outsole A. The upper projecting part K1 of the 1st outsole to increase the joint area is formed on the front surface A1a of the 1st outsole Al which is the adjacent part to the 2nd outsole A2. The molding of the 1st outsole Al forms a gap 30 for molding the 1st outsole by fitting a 1st dummy last 20 for molding the upper rugged part K1 of the 1st outsole over the entire area of a base 20a on a bottom mold 10. The 1st outsole is molded after the 1st outsole molding material Al is packed into the gap 30 for molding the 1st outsole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an injection-molded sole comprising a plurality of partial soles used for footwear such as men's shoes, women's shoes, boots, sports shoes, sandals and slippers.

[0002]

2. Description of the Related Art Today, shoe soles used for footwear, especially shoe soles such as sports shoes, have been made multi-layered and lightweight in accordance with the needs of the times. The multicolor multi-layering and weight saving of the sole substantially means that the sole is formed by many thin partial soles having different hues from each other, and thus the joining of the partial soles is inevitably performed. The area becomes smaller, and the joint strength of these partial shoe soles decreases. In particular,
The multi-colored multi-layering and weight reduction of the sole by forming the sole with a larger number of thin partial soles causes a significant decrease in joint strength in an injection-molded sole provided by injection molding a sole molding material. Let That is, the partial shoe sole molding void for injection-molding each of the partial shoe soles formed between the predetermined molds becomes smaller, and therefore the temperature of the partial shoe sole molding material injected into the partial shoe sole molding void is reduced. Due to the decrease, the fluid pressure is decreased, so that there is a possibility that the partial shoe sole molding material is not filled in the voids, the joining strength between the adjacent shoe soles is reduced, and the shoe sole is peeled off. .. Even in the case where there is no such fear, the adhesive strength of the adjacent shoe soles is relatively lowered in the portion having a small bonding area (for example, the toe portion), and the shoe sole may be peeled off.

The present invention has been made against the background of such a conventional technique, and provides a method for manufacturing an injection-molded shoe sole capable of improving the joining strength between the joined shoe soles and free from peeling. The purpose is to provide.

[0004]

The present invention provides a method for manufacturing an injection-molded shoe sole, which is characterized in that the following steps (1) to (2) are sequentially performed. The first outsole molding gap formed between the first dummy last and the bottom mold, which are formed on the upper surface of the first outsole so as to form a concavo-convex structure for increasing the joint area in the adjacent portion of the partial shoe sole. A step of injecting and filling a molding material into the first to inject the first outsole and leaving the first outsole on the bottom mold to remove the first dummy last. A second dummy last for forming a concavo-convex structure that increases a joint area on the upper surface of the second outsole in the adjacent portion of the partial shoe sole, and a second outsole molding formed between the second mold and the bottom mold. Injection of molding material into the cavity
A step of filling and injection-molding the second outsole, combining with the first outsole to form an outsole, and then removing the second dummy last. The bottom mold with the outsole left is fitted to the side mold on which the main body last is mounted, and the molding material is formed in the midsole molding gap formed by the main body last, the side mold, and the bottom mold. The process of injecting and filling and injection molding the midsole to complete the shoe sole.

[0005]

According to the present invention, since the concavo-convex structure is formed on the adjacent shoe soles as described above, the injection-molded shoe sole having an increased joining area and improved joining strength between the joined shoe soles. Can be manufactured.

[0006]

Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto. In describing this embodiment, a method for manufacturing an injection-molded shoe sole for sports shoes (hereinafter referred to as a shoe sole) will be taken as an example. As shown in FIGS. 1 and 2, a shoe sole manufactured according to an embodiment of the present invention includes an outsole (partial shoe sole) A and a midsole (partial shoe sole) M. It is formed from an outsole (partial shoe sole) A1 and a second outsole (partial shoe sole) A2. The first outsole A
As shown in FIGS. 3 and 4, reference numeral 1 denotes a belt-shaped sole that covers the outer peripheral portion of the ground contact surface of the outsole A, which is the upper portion of the first outsole (adjacent portion) that is adjacent to the second outsole A2. ) A1a is formed with a first outsole upper uneven portion (uneven structure) K1 for increasing the joint area. The first outsole upper uneven portion K1 is a fine uneven portion having an uneven width of 0.2 to 0.6 mm, and is formed on almost the entire upper surface A1a of the first outsole.

The molding of the first outsole A1 is performed, for example, as shown in FIG. 5 and FIG.
0, a first dummy last 20 having a satin finish N for forming the first outsole upper concave-convex portion K1 on almost the entire bottom surface 20a is fitted to the bottom mold 10 and the first dummy. A first outsole molding gap 30 is formed between the last 20 and the last 20. At this time, on the first dummy last 20, the side mold 40 and the main body last 50 to which the skin H is attached are sequentially stacked from the bottom. After that, the first injection gate 11 formed in the bottom mold 10 in the first outsole molding gap 30.
The first outsole in which the first outsole upper uneven portion K1 is formed on the first outsole upper surface A1a shown in FIGS. 3 and 4 by injecting and filling the first outsole molding material A11 of the hard sole material from A1 is injection-molded, and then this molded first outsole A1 is applied to the bottom mold 1
0, the first dummy last 20 is removed from the bottom mold 10. In addition, this first dummy last 20
Is removed by rotating the first dummy last 20 in the lateral direction.

The second outsole A2 is a sole laminated on the first outsole A1 as shown in FIGS. 1 and 2, and is adjacent to the midsole M as shown in FIGS. 3 and 7. The second outsole upper surface (adjacent part) A2a, which is a part, is provided with a second outsole upper convex part (concavo-convex structure) K2 that increases the bonding area, and is a part adjacent to the first outsole A1. A second outsole lower concavo-convex portion (concavo-convex structure) K1 'which is a minute concavo-convex portion corresponding to the first outsole upper concavo-convex portion K1 is formed on the lower surface (adjacent portion) A2b of the second outsole. The second outsole upper convex portion K2 has a convex portion height of 0.5.
~ 1.0 mm triangular pyramid-shaped small protrusions are formed around the tip of the toe that are easy to peel off at predetermined intervals, and the second unevenness K1 'on the lower side of the second outsole is the lower surface of the second outsole (adjacent part). A2b is formed on the entire joint portion with the first outsole upper surface A1a.

The second outsole A2 is molded by fitting a second dummy last 60 for molding the second outsole A2 to the bottom mold 10 as shown in FIGS. 8 and 9, for example. A second outsole molding gap 70 is formed between the bottom mold 10 and the second dummy last 60. In addition, around the toe molding portion 60a on the bottom surface of the second dummy last 60, as shown in FIG.
As shown in FIG. 3, triangular pyramidal small depressions T for molding the second outsole upper convex portion K2 are formed at predetermined intervals, and the fitting of the second dummy last 60 with the bottom mold 10 is performed. In this case, first, the second dummy last 60 is placed under the side mold 40 on which the main body last 50 is placed.
Are fitted, and then the bottom mold 10 is fitted to the lower portion of the second dummy last 60. After that, the second outsole molding material A21, which is a hard sole material, is injected and filled from the second injection gate 12 formed in the bottom mold 10 into the second outsole molding void 70, as shown in FIGS. Then, the second outsole A2 shown in FIG. 7 is injection-molded.

As shown in FIGS. 1 and 2, the midsole M is the uppermost sole of the shoe sole laminated on the outsole A, and as shown in FIG. 3, the midsole M and the second outsole upper surface A2a. Lower surface of the midsole which is the adjacent part (adjacent part)
Ma has a midsole lower concave portion (uneven structure) K2 ′ corresponding to the second outsole upper convex portion K2. The midsole lower concave portion K2 'is formed around the toe portion corresponding to the second outsole upper convex portion K2 in a corresponding shape at predetermined intervals.
For example, as shown in FIG. 11, the molding of the midsole M is the second molding used for molding the second outsole A2.
The dummy last 60 is removed from the bottom mold 10 and rotated in the lateral direction, and the bottom mold 10 is fitted to the side mold 40 on which the main body last 50 is placed instead of the second dummy last 60. A midsole molding gap 80 is formed between the main body lasts 50. After that, this void 80 for molding the midsole
A midsole injection material 41 formed in the side mold 40 is injected and filled with a midsole molding material M1 of a foamed soft sole material to form a midsole lower recess K2 'shown in FIGS. 1 to 3. The midsole M is injection molded.

As described above, in the shoe sole used in the embodiment of the present invention, the adjacent first outsole A is used.
Since the concavo-convex structure for increasing the joint area is applied to each adjacent portion of the first and second outsole A2 and the midsole M,
The joint strength between the partial shoe soles to be joined can be improved.
Further, in the embodiment, since the shoe sole is molded by injection molding, it is possible to form the uneven portion on any one of the adjacent portions of the first outsole A1, the second outsole A2, and the midsole M. The corresponding concavo-convex portion is inevitably injection-molded at the other adjacent portion at the time of molding. Further, by adopting the present invention for manufacturing the injection-molded shoe sole as described above, the first outsole A formed between the predetermined molds.
The first outsole molding void 30, the second outsole molding void 70, and the midsole molding void 80 for injection molding the partial shoe soles of the first, second outsole A2, and the midsole M are small. Even then, the joining area becomes large, so that sufficient joining strength can be obtained.

Although the embodiment of the present invention has been described above, the specific configuration and operation are not limited to this embodiment, and the present invention can be applied even if there is a design change or the like within a range not changing the gist of the present invention. Included in the invention. For example, in the examples, as the concavo-convex structure for increasing the joint area in the adjacent part of the partial shoe sole, the satin finish with a small concavo-convex width and the conical concavo-convex structure with a medium concavo-convex width are shown, but the invention is not limited thereto. However, the shape may be another shape having a large uneven height of 1.0 to 3.0 mm. Further, the range in which the concavo-convex structure is applied may be a part or the whole area, and is not limited as long as it is an adjacent part of the adjacent partial sole. For example, the second insole inner convex portion K2 may be provided not only on the toe portion but also on the entire circumference of the shoe sole.

[0013]

As described above, according to the present invention, a shoe sole composed of a plurality of partial shoe soles is manufactured in such a manner that a concavo-convex structure for increasing a joint area is formed in an adjacent portion of the adjacent partial shoe soles. Therefore, it is possible to obtain an effect that the joint strength between the partial shoe soles to be joined can be improved. Further, by adopting the present invention to an injection-molded shoe sole, the joining area becomes large even if the partial shoe sole molding void for injection-molding each partial shoe sole formed between predetermined molds becomes small. It is possible to obtain a sufficient joint strength with, so there is no fear that the shoe sole will peel off, and if concavo-convex parts are formed on either one of the adjacent parts, molding will be performed on the other adjacent part. At times, there is an effect that the corresponding uneven portions are necessarily formed and joined.

[Brief description of drawings]

FIG. 1 is a front view of a shoe using a shoe sole manufactured according to an embodiment of the present invention.

FIG. 2 is a bottom view of a shoe sole manufactured according to an embodiment of the present invention.

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

FIG. 4 is a plan view showing a first outsole of a shoe sole according to an embodiment of the present invention.

FIG. 5 is a central vertical cross-sectional view showing the manufacturing process of the first outsole of the shoe sole in the example of the present invention.

6 is a cross-sectional view taken along the line VI-VI of FIG.

FIG. 7 is a plan view showing a second outsole of the shoe sole according to the embodiment of the present invention.

FIG. 8 is a central vertical cross-sectional view showing the manufacturing process of the second outsole of the shoe sole in the example of the present invention.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is an enlarged view of an X portion of FIG.

FIG. 11 is a central vertical cross-sectional view showing the manufacturing process of the midsole rule for the shoe sole in the example of the present invention.

[Explanation of symbols]

 A outsole (partial shoe sole) A1 first outsole (partial shoe sole) A2 second outsole (partial shoe sole) M midsole (partial shoe sole) A1a first outsole upper surface (adjacent part) A2a second out Sole upper surface (adjacent portion) A11 First outsole molding material A21 Second outsole molding material M1 Midsole molding material K1 First outsole upper uneven portion (uneven structure) K2 Second outsole upper protruding portion (uneven structure) H Cover 10 Bottom mold 20 First dummy last 30 First outsole molding void 40 Side mold 50 Main body last 60 Second dummy last 70 Second outsole molding void 80 Midsole molding void

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29C 45/16 7344-4F // B29L 9:00 4F 31:50 4F

Claims (1)

[Claims] 1. A method of manufacturing an injection-molded shoe sole, which comprises sequentially performing the following steps. The first outsole molding gap formed between the first dummy last and the bottom mold, which are formed on the upper surface of the first outsole so as to form a concavo-convex structure that increases the joint area in the adjacent portion of the partial shoe sole. A step of injecting and filling a molding material into the first to injection-mold the first outsole, and leaving the first outsole on the bottom mold to remove the first dummy last. A second dummy last for forming a concavo-convex structure for increasing a joint area on an upper surface of the second outsole and a second dummy last fitted between the bottom mold and the bottom mold to form a second outsole molding therebetween. Injection of molding material into the cavity
A step of filling and injection-molding the second outsole, combining with the first outsole to form the outsole, and then removing the second dummy last. The bottom mold with the outsole left is fitted to the side mold on which the main body last is mounted, and the molding material is formed in the midsole molding gap formed by the main body last, the side mold, and the bottom mold. The process of injecting and filling and injection molding the midsole to complete the shoe sole.