JPS6057843B2 - Manufacturing method for shoe soles - Google Patents

Description

[Detailed Description of the Invention] Conventionally, shoe soles, especially athletic shoe soles, have had good abrasion resistance and anti-slip properties on the contact side that contacts the ground or floor surface, and are lightweight and have good elasticity on the upper side. was required to be.

In order to meet the above-mentioned requirements, conventional shoe soles are made of a foamed rubber body that is lightweight and has good elasticity, and a solid rubber body that is already vulcanized and has good abrasion resistance with an adhesive. A sole that is bonded to a shoe sole, or an unvulcanized and unfoamed cellular rubber material that is lightweight and has good elasticity, and an unvulcanized solid rubber material, or an unvulcanized and unfoamed cellular rubber material that has good abrasion resistance. rubber material,
Some attempts have been made to obtain an integrally molded shoe sole by heating, pressurizing, vulcanizing, or pressurizing reaction within a shoe sole mold.

The aforementioned secondary shoe sole, for example, a shoe sole made by adhesively bonding a foamed foam material and a vulcanized solid rubber material, is heated and pressurized separately.
After foam molding, these bonding surfaces are coated with an adhesive, bonded under pressure, and then cut and formed into the desired sole shape, which is time consuming and costly. Similarly, an unvulcanized comb body material and an unvulcanized, unfoamed cellular rubber material, or a plurality of different unvulcanized, unfoamed rubber materials (composed of different foaming ratios) are delivered into the same mold. It is intended to be integrally molded by sealing the parts and performing heat-pressure vulcanization foaming or heat-foaming. However, since each member has different foaming conditions such as foaming rate and foaming pressure, foaming is difficult. After that, the sole shape of the shoe was different from the desired shape and the appearance was extremely poor, or a plurality of layers were jumbled together and the appearance was poor, both of which had poor commercial value. Furthermore, none of the conventional shoe soles mentioned above could have any design applied to the side surface of the sole, and could not contribute to providing high added value. The method for manufacturing a shoe sole of the present invention includes a lower mold having a recess with a desired sole shape and bottom design, an unvulcanized unfoamed rubber material in a lower mold, an upper mold, etc., and a foamed thermoplastic material thereon. The unvulcanized rubber material is placed in a mold that is heated and pressurized, so that the unvulcanized rubber material conforms to the design of the unevenness on the bottom of the recess, and the rubber material forms the air bubbles above it. By biting into and bonding to the resin body material, and because the cell resin body material is made of a material with good thermoplasticity such as EVA foam, its top, bottom and side surfaces are shaped into the desired shoe sole shape by heat and pressure. Since it can be molded into a product with a design pattern, etc., it is possible to provide a shoe sole with an extremely good appearance and high added value.

A method of manufacturing a shoe sole according to the present invention that can achieve the above-mentioned objects will be explained below with reference to the drawings.

First, the method for manufacturing the shoe sole of the present invention is as shown in FIGS. An unvulcanized and unfoamed cellular rubber material b is prepared.

These cellular resin material a and the rubber material or cellular rubber material b may be cut in advance into the outer peripheral shape of the shoe sole,
The cellular resin material a may be formed to be slightly thinner on the toe side and slightly thicker on the heel side, as shown in FIG. Next, as shown in FIGS. 2 1 to 2, the method for manufacturing shoe soles of the present invention uses a mold A consisting of an upper mold 1 and a lower mold 3.
The upper mold 1 is shown in FIG. A flat lid-shaped one such as the one shown in FIG. can be formed into

Next, the lower mold 3 of the mold A is shown in FIG. 2 1 and 3 1.
As shown in FIG.
A large number of protrusions 5, 5 forming anti-slip grooves on the contact surface side of the sole B are provided on the bottom surface corresponding to the inside, and the lower mold 3 is shown in FIGS. 2 and 3 as well as in FIG. As shown in (2), a slightly deep recess 4'' is formed so that the peripheral edge of the sole B to be molded can be formed, and on the outer side of the recess 4'' is formed mainly the heel side or the area extending from the non-stepping part to the heel. Two left and right side molds that can be removed by sliding the sides outward in the lateral direction, and that are provided with engravings 7 that form part 6 of the recess 4'' and further form the side design of the sole B on the inner wall. 2 can be attached and detached. The left and right side molds 2, 2 of the lower mold 3 can heat and press the thermoplastic J-cell resin material a, so they are provided with peripheral edges t as shown in FIG. In addition, a side design 4 such as a trademark, a combination of patterns, etc. can be easily engraved mainly on the heel side or on the side extending from the unstepped part to the heel on the outer surface side. The upper mold 1 and the lower mold 3 as described above or the left and right side molds 2 and 2 are slid laterally to be attached and removed freely, and the lower mold 3 is combined, and the foamed cellular resin material a and the unvulcanized In the method for manufacturing a shoe sole of the present invention using the com material or the unvulcanized and unfoamed cellular rubber material b, first, the mold A is heated in advance at 100 to 20 °C, and then the steps shown in Figs. As shown in , first, in the recess 4'' of the lower mold 3 of the mold A and the recess 6 of the side mold 2 (or the recess 4 of the lower mold 3), unvulcanized material is cut into the shape of the sole circumference, if possible. Insert a slightly thin layer of rubber material or unvulcanized, unfoamed cellular com material b, and then add thermoplastic cellular resin material a that easily softens with heat, such as foamed EVA, to form a flat surface. The toe part, which was the circumferential shape of the shoe sole, is slightly thinner and is cut into a very thick layer towards the heel side. A lower mold 3 in which the unvulcanized rubber material or the unvulcanized and unfoamed cellular comb material b is cut, and then the cellular resin material a and the rubber material or the cellular rubber material b are inserted. The two side molds 2, 2 (or only the lower mold 3) are closed with the upper mold 1 (or lid-shaped upper mold 1) having a raised part 6 on the lower surface side, and heated and pressurized for 5 minutes to 1 minute. Continue that blockage.

Meanwhile, the unvulcanized rubber material in the mold A is vulcanized to form the solid rubber outer sole A, and the adhesive previously applied to the bottom side of the foamed thermoplastic cellular resin material A is is adhesively bonded to the cellular resin material a. At this time, for example, mold A
Protrusions 5, 5 provided on the bottom side of the recess 4'' of the lower mold 3 and the recess 6 of the side molds 2, 2 (or the recess 4 of the lower mold 3)
An integral combination of a solid rubber outer sole with a large number of anti-slip grooves on the bottom side and a raised part by being pressed by the rubber, and a bottom main opening made of cellular resin on the top side. The sole B, which is the body, is molded. The main body of the sole B is made of a thermoplastic cellular resin material a such as EVA that is easily softened by heat. By forming a recess corresponding to the rising portion, and thereby being coupled so as to bite into each other, the bonding force is further strengthened. Next, the mold A
is cooled by being left in cooling water or at room temperature, and after the upper mold 1 of the mold A is removed from the lower mold 3 or from the lower mold 3 and the side molds 2, 2, the sole B is molded out. At this time, the sole B is heated by the left and right side molds 2, 2, which are part of the lower mold 3 of the mold A, and the side mold 2 is pressed by a cylinder or the like.
, 2. Therefore, the bottom main opening of the sole B is made of EVA.
Since it is a thermoplastic cellular resin material a that is easily softened by heat, the engravings 7 provided on the inner wall surfaces of the respective recesses 6 of the side molds 2, 2 make it possible to reduce the inner surface side mainly at the heel side. Alternatively, since the trademark pattern or the side design consisting of a combination of these can be clearly expressed on the part extending from the non-stepping part to the heel part, the appearance of the sole B and the athletic shoes equipped with the same can be improved, and its commercial value can be further increased. be enhanced. In addition, each of the side molds 2 is attached to the lower mold 3 by sliding in the lateral direction of the lower mold 3, and can be removably combined, so that the side design can be clearly expressed mainly at the main body opening of the sole B. In addition, it is extremely easy to take out the molded sole B from the lower mold 3, and by preparing the side mold 2 with various engravings 7 on the inner wall surface of the recess 6, different side surface designs can be created. It is possible to easily manufacture the provided shoe sole B.

Similarly, the sole B can be provided with or without a sole peripheral edge H formed from the upper surface, as shown in FIGS. B can be provided with the above-mentioned side surface design mainly on the outer surface side of the peripheral edge of the sole (E), mainly on the heel side or on the area extending from the non-stepping part to the heel. As shown in FIG.
The upper mold 1, which was connected to the lower mold 3 and covered with the lower mold 3, can be opened by lifting the other end side.
As shown in FIGS. 1 to 3, the knocks 11 protruding from the upper mold 1 are inserted into the through holes or recesses 10 provided in the lower mold 3 or the lower mold 3 and the side molds 2, 2. and the lower mold 3 or the lower mold 3 and each side mold 2 can be combined, and a second
As shown in FIG. are tightened and connected.
Therefore, the unvulcanized rubber material b inserted into the upper mold 1 and lower mold 3 of the mold A is kept at the temperature of the mold A: 100 to 200 degrees Celsius.
By heating and pressurizing the powder for 5 to 1 minutes, it is possible to easily form a solid rubber outer sole A that is vulcanized and molded and combined with the cellular resin material a. Similarly, the upper mold 1, the lower mold 3, and the side mold 2,
The unvulcanized and unfoamed cellular rubber material b inserted into the mold A is heated and pressurized for 5 to 1 minutes at a temperature of 10 to 20 degrees Celsius to foam and mold the foamed rubber material b. It is possible to easily form the outer sole A of the molded article of cellular resin that is firmly bonded to the body material A. BRIEF DESCRIPTION OF THE DRAWINGS The drawings illustrate the method of manufacturing the shoe sole of the present invention.

Claims (1)

[Scope of Claims] 1. A foamed thermoplastic cellular resin material a and an unvulcanized rubber material or an unvulcanized and unfoamed cellular rubber material are integrally molded in a mold for a shoe sole. To do this, the mold A is heated in advance, and a slightly thin layer of unvulcanized rubber material or unvulcanized and unfoamed cellular rubber material is placed in the recess 4 of the lower mold 3 of the mold A. Insert the unfoamed rubber material or the unfoamed foamed foamed rubber material on top of the foamed foamed foamed foamed thermoplastic foamed resin material a with an adhesive applied to the lower surface side in advance. The lower mold 3 into which these rubber materials or cellular rubber materials and the cellular resin material a are inserted is sealed with the upper mold 1, and after molding under heat and pressure, the mold is cooled and the sole is taken out. A method for manufacturing shoe soles characterized by: 2. The lower mold 3 of the mold A is characterized in that an engraving 7 is provided on the outer side of the recess 4 at a location where a decorative design such as a trademark or a pattern such as a pattern, symbol, or character is to be displayed. A method for manufacturing a shoe sole according to claim 1. 3 The lower mold 3 of the mold A has a deep recess 4 on its outer side that can be attached and removed by sliding horizontally mainly on the heel side, the unstepped side, or the area extending from the unstepped part to the heel. The shoe sole according to claims 1 and 2, characterized in that it has two left and right middle molds 2 each having a carving 7 forming a part 6 of the shoe sole and forming a decorative design on the inner wall thereof. Production method. 4 Claims characterized in that the mold A is provided with a clamping part 9 for fastening the two left and right middle molds 2 and the lower mold 3 or the upper mold 1 and the left and right middle molds 2, 2 and the lower mold 3. A method for manufacturing a shoe sole according to items 1 to 3.