JPH04224702A - Shoes sole and manufacturing method therefor - Google Patents

Abstract

PURPOSE:To provide a shoes sole formed by integrally fixing rubber-made ground-contacting shoes bottom and polyurethane foam-made main body of shoes sole and to prevent the deposition of polyurethane stock onto the side periphery and the ground-contacting bottom of shoes in the manufacturing process thereof. CONSTITUTION:A ground-contacting bottom 2 of a shoes sole is separated into the main bottom 21 and the heel portion 22. In addition the shoes is provided with rise portions 21a, 21b with a predetermined height on the periphery. In a recessed portion formed of the inner surfaces of the non-ground contacting surface of the ground-contacting bottom, a foam polyurethane-made main body 3 of the bottom is packed and secured. The rise portions 21a, 21b inhibit the deposition of stock onto the side periphery and ground-contacting surface.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe sole in which a rubber ground sole and a foamed polyurethane sole body are integrally fixed, and a method for manufacturing the same.

0002

BACKGROUND OF THE INVENTION Conventionally, foamed polyurethane shoe soles are suitable for reducing the weight of shoes, and have been used in sports shoes, sneakers, and the like. In addition, in order to improve the anti-slip function,
It is also known that the bottom body is made of foamed polyurethane, and a piece of vulcanized rubber is adhered and laminated to a part of the ground surface.

0003

[Problems to be Solved by the Invention] However, so far, shoe soles in which a rubber ground-contact sole is firmly laminated on the entire ground-contact surface side of a sole body made of foamed polyurethane have hardly been manufactured. This is because the thickness from the heel part to the lower edge of the upper is different from the thickness from the outsole to the lower edge of the upper. The thickness must be sufficient to ensure the thickness from the heel to the lower edge of the upper, and
This is mainly due to the fact that since the sole and heel are integrated, the number of pieces molded in one mold becomes extremely small, which is extremely disadvantageous in terms of manufacturing costs.

[0004] However, as mentioned above, the polyurethane foam is exposed, and there is a problem in that it is particularly susceptible to being penetrated by chips such as iron chips, which tends to cause cracks. In addition, they are inferior to rubber ones in terms of heat resistance, pressure resistance, slip resistance, and impact resistance, and are used for purposes other than the above-mentioned sports shoes, such as the soles of work safety shoes. In this case, there were restrictions on the conditions and its use was relatively limited. On the other hand, when laminating and fixing foamed polyurethane and a rubber ground sole, even if it is a conventional shoe sole with a rubber grounding sole fixed to a part, the foamed polyurethane stock solution is foamed in a mold to fix both. In this case, the foamed polyurethane stock solution may adhere to the side circumferential surface of the rubber ground sole or the ground surface side, or burrs may form in the gap between the upper and lower molds. There was also the problem that the adhered polyurethane foam had to be removed afterwards.

The present invention has been made to solve the above-mentioned problems, and in order to expand the uses of shoe soles using foamed polyurethane, a rubber grounding sole is laminated and fixed on the entire exposed surface, and at a low cost. An object of the present invention is to provide a shoe sole with a new structure that can be manufactured using the above-mentioned method and which can prevent the adhesion of polyurethane and the occurrence of burrs during manufacturing, and a method for manufacturing the same.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the sole of the present invention is separated into a main sole part and a heel part, and a peripheral part other than the end edge of the main sole part has a predetermined height. a rubber grounding sole having a raised part; and a main bottom part of the grounding sole, which is made of foamed polyurethane and is filled and fixed in a recess formed by the non-contacting surface of the grounding sole and the inner surface of the raised part; It is characterized by having a bottom main body, a part of the distal edge side of which is fixed to the foamed polyurethane layer forming the heel part, and which is integrated with the grounding sole, and the method for manufacturing the bottom main body is as follows: In a method of manufacturing a shoe sole in which a sole body made of polyurethane foam is integrally fixed, the ground sole is molded separately into a sole part and a heel part, and has a raised part except for the end edge of the sole part. Using a mold, place the sole and the heel in one mold so that the rising parts of the two are approximately at the same height, and a part of the end edge of the sole forms the heel of the sole body. fixedly fixed to the foamed polyurethane layer, and then filled with a foamed polyurethane stock solution into the recess formed by the non-contacted surface of the grounded bottom and the inner surface of the raised part,
After that, the other mold is joined, and the foamed polyurethane stock solution is foamed while preventing the foamed polyurethane stock solution from adhering to the side circumferential surface and ground surface of the grounded sole using the raised portion, and the foamed polyurethane stock solution is foamed onto the grounded bottom. The bottom body made of foamed polyurethane is integrally fixed to the bottom body.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in more detail below based on an embodiment shown in the drawings. In the figure, reference numeral 1 indicates a shoe sole according to the present embodiment, which includes a grounding sole 2, a sole body 3, and the like.

The grounding sole 2 is made of rubber, and is molded separately into a main sole portion 21 and a heel portion 22, as shown in FIGS. 2 and 3. Further, a raised portion 21a is formed on the peripheral edge of the bottom portion 21 except for the distal edge 21b. As will be described later, this rising part 21a is caused by the outflow of the foamed polyurethane stock solution from the mold during manufacturing, and by the burrs and ground bottom 2 that occur in the gap between the upper mold and the lower mold when the foamed polyurethane stock solution foams and expands. This function is to prevent the mold from adhering to the side circumferential surface or ground surface of the mold, and its height is such that it contacts the inner surface of the upper mold when it is joined.

[0009] Furthermore, it is preferable that a plurality of columnar protrusions 21c of a predetermined height are formed on the non-contact surface side near the distal edge 21b of the bottom portion 21. According to this, when the upper mold is joined, the columnar projection 21c can press the vicinity of the end edge 21b against the lower mold by coming into contact with the inner surface of the upper mold, so that foaming during manufacturing can be prevented. It is possible to prevent the polyurethane stock solution from adhering to the side peripheral surface and the ground surface from the end edge 21b side. Therefore, its height is
There is no particular limitation as long as the height is in contact with the inner surface of the upper mold, but for example, if the inner surface of the upper mold has a shape that protrudes toward the lower mold at approximately the center, as shown in FIG. 4 and FIG. It is formed slightly lower than the portion 21a. Furthermore, as shown in FIG. 5, the bottom part 21 is formed by bending the vicinity of the distal edge 21b downward at a predetermined angle, and a raised part 22a formed at the distal end of the heel part 22, which will be described later, and the distal edge 21b may be joined to each other.

On the other hand, as shown in FIG. 3, a raised portion 22a is also formed at the peripheral edge of the heel portion 22 and serves a similar function. The height of this raised part 22a, like the raised part 21a of the main bottom part 21, is such that it touches the inner surface of the upper mold when it is joined, that is, when it is placed in the lower mold of the mold. The upper edge of the raised portion 22a and the upper edge of the raised portion 21a of the main bottom portion 21 are formed to be at the same height. The stepped portion 22b formed by cutting out a part of the tip of the raised portion 22a overlaps with the vicinity of the end edge 21b of the main sole portion 21, thereby increasing the heel portion of the sole body 3 formed of polyurethane foam. Fixing the vicinity of the end edge 21b to the foamed polyurethane layer to be formed,
This prevents the bottom portion 21 and the heel portion 22 from separating.

As shown in FIG. 6, the sole portion 21 and the heel portion 22 have raised portions 21a, 22a and an edge 21e projecting outward from the upper edge thereof. Good too. According to this, if the foamed polyurethane stock solution should leak out from the inner surface of the upper mold and the upper edges of the raised parts 21a and 22a during manufacturing, or if the inner surface of the upper mold has been processed such as knurling, As a result, even if the inner surface of the upper mold and the upper edge of the raised portion do not match and a gap is created, it is possible to prevent the mold from running around and adhering to the side peripheral surface of the grounding sole 2 and the grounding surface side.

The sole main body 3 is made of foamed polyurethane, and the non-contacting surfaces 21 of the main sole part 21 and the heel part 22 of the above-mentioned grounding sole 2
d, 22d and the respective raised portions 21a, 22a are filled with the concave portions.

Next, a method for manufacturing the shoe sole 1 of this embodiment will be explained. First, in order to bond the grounding sole 2 and foamed polyurethane, a primer or the like is applied to the non-grounding surface of the grounding sole 2, and the above-mentioned grounding sole 2 is placed on one mold (lower mold) of a mold (not shown). Set it in place. At this time, the raised part 21a of the main sole part 21 of the grounding sole 2 and the raised part 22 of the heel part
It is necessary to arrange the upper edges of a to be at approximately the same height. Further, the vicinity of the distal edge 21 of the main sole portion 21 is disposed so as to overlap the stepped portion 22b formed in the heel portion 22.

Next, the foamed polyurethane stock solution is applied to the main bottom part 2.
1 and the non-contact surfaces 21d and 22d of the heel portion 22 and the respective raised portions 21a and 22a are filled with a predetermined amount.

After that, the other mold (not shown) is
The upper mold) is joined to the lower mold, and the foamed polyurethane stock solution is foamed and solidified under predetermined conditions to form the bottom body 3. At this time, according to the manufacturing method of this embodiment, the grounding bottom 2
Since the raised portions 21a and 22a are provided at the top, the foamed polyurethane stock solution may flow out from the peripheral edge and adhere to the side circumferential surface and ground surface of the grounding sole 2, or cause burrs to form in the gap between the upper mold and the lower mold. The bottom main body 3 is formed without forming. Also,
Since the main bottom part 21 has a plurality of pillar projections 21c, the upper surface of the pillar projections 21c comes into contact with the inner surface of the upper mold, so that the vicinity of the end edge 21b of the main bottom part 21 becomes lower mold. , so that no gap is created between the end edge 21b and the lower die. Therefore, the terminal edge 21b
It can be manufactured while also preventing the foamed polyurethane stock solution from adhering from the side.

[0016] Also, the vicinity of the distal edge 21b of the bottom portion 21 is
Since the foamed polyurethane stock solution is filled after overlapping the stepped portion 22b of the heel portion 22, the vicinity of the end edge 21b is fixed to the foamed polyurethane layer filled into the heel portion 22, as shown in FIG. It turns out. Further, as shown in FIG. 5, even when the bottom portion 21 is bent near the end edge 21b, it is fixed to the foamed polyurethane layer filled in the heel portion 22. Therefore, even if the ground-contact sole 2 is formed separately into the main sole 21 and the heel 22, cracks or the like will not occur in the sole 1 from the joint between the two. Note that, since the raised portions 21a and 22a are formed at a height in contact with the inner surface of the upper mold, it is desirable to use a mold in which deaeration holes are formed at appropriate locations such as the upper mold.

[0017] As mentioned above, as the grounding sole 2,
When using the one having the edge 21e shown in FIG. 6, it is of course necessary to remove the edge 21e by cutting or the like after fixing the bottom body 3 made of foamed polyurethane.

[0018]

Effects of the Invention According to the shoe sole and the method for manufacturing the same of the present invention, since the rubber ground sole is molded separately into the main sole and the heel, the mold for molding the ground sole is It can be divided into one for the bottom part and one for the heel part. Therefore, a thin mold can be used for the outsole, and the number of outsole and heel parts that can be molded with one mold can be increased compared to the conventional method. As a result, a shoe sole in which the entire contact surface side of the sole body made of foamed polyurethane is covered with a rubber contact sole can be manufactured at low cost. In addition, it can prevent the sole from cracking due to chips getting stuck in it, which was a problem with conventional foamed polyurethane soles, and it also has heat resistance, chemical resistance, pressure resistance, impact resistance, Abrasion resistance, slip resistance, etc. can be improved. Therefore, it can be used for various purposes such as safety shoes for work. In addition, since the structure has a raised portion on the periphery of the grounded sole, it is possible to prevent the foamed polyurethane stock solution from flowing out during manufacturing, and prevent it from flowing around and adhering to the grounding surface side of the grounding sole. Furthermore, it is possible to prevent burrs from occurring in the gap between the upper mold and the lower mold when the foamed polyurethane stock solution foams and expands. Therefore, there is no need for work to remove deposits and burrs, which contributes to a reduction in manufacturing steps.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a shoe sole according to the present invention.

FIG. 2 is a perspective view showing the main body of the grounding sole used in the same example.

FIG. 3 is a perspective view showing the heel portion of the ground-contacting sole used in the same example.

FIG. 4 is a sectional view of the same embodiment.

FIG. 5 is a sectional view showing another embodiment of the sole according to the present invention.

FIG. 6 is a perspective view showing a part of the ground sole in which a raised portion having an edge is formed.

[Explanation of symbols]

1. Sole 2 Ground bottom 3. Bottom body

Claims (5)

[Claims] Claim 1: A ground sole made of rubber and made of polyurethane foam, which is separated into a sole part and a heel part, and has a raised part of a predetermined height on the peripheral edge except for the end edge of the sole part. , filled and fixed in a recess formed by the non-contacting surface and the inner surface of the raised part of the grounding sole, and a part of the end edge side of the main bottom part of the grounding sole is fixed to a foamed polyurethane layer forming a heel part, a bottom body integrated with the grounded bottom;
A shoe sole characterized by having. 2. The grounding sole has a columnar protrusion of a predetermined height on the non-contacting surface of the main sole and near the distal edge thereof, and the bottom main body has a columnar projection of a predetermined height on the non-contacting surface of the main sole. 2. The shoe sole according to claim 1, which is formed by filling and fixing foamed polyurethane so as to surround the columnar projection. 3. A method for manufacturing a shoe sole in which a sole body made of foamed polyurethane is integrally fixed to a ground sole made of rubber, in which the main sole part and the heel part are separately molded, and the main sole part Use a grounded sole that has a raised part on the part other than the end edge, and place the outsole and heel part in one mold so that the raised parts of both are approximately at the same height, and place the outsole on the end edge side of the outsole. A portion of the foamed polyurethane layer forming the heel portion of the sole body is placed so as to be fixed thereto, and then a foamed polyurethane stock solution is filled into the recess formed by the non-contacting surface of the grounded sole and the inner surface of the raised portion. After that, the other mold is joined, and the foamed polyurethane stock solution is foamed while preventing the foamed polyurethane stock solution from adhering to the side circumferential surface of the grounded sole and the ground surface by the raised part, and the foamed polyurethane stock solution is foamed. A method for manufacturing a shoe sole, characterized by integrally fixing a foamed polyurethane sole body to the sole. 4. The grounding sole further has a columnar protrusion of a predetermined height on the non-contacting surface of the main sole and near its end edge, so that when the other mold is joined, Then, the inner surface of the other mold comes into contact with the upper surface of the columnar protrusion, presses the vicinity of the end edge of the main body part of the grounded bottom against the one mold, and the side peripheral surface of the foamed polyurethane stock solution from the vicinity of the end edge. and claim 3 which can also prevent adhesion to the ground surface side.
The method of manufacturing the soles described. 5. To prevent the foamed polyurethane stock solution from adhering to the side peripheral surface and the ground surface side even if a gap occurs between the inner surface and the upper edge of the raised part due to the shape of the other mold. , furthermore, as the grounding sole, one having an edge protruding outward on the upper edge of the rising part is used;
5. The method of manufacturing a shoe sole according to claim 3, further comprising a step of removing the edge after molding.