JPH0222641B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for manufacturing rubber shoe soles, and in particular, to a method for manufacturing rubber shoe soles, in particular, a method for manufacturing rubber shoe soles in which the tread area, heel area, marks, etc. of the sole are unique from other parts. The present invention relates to a method of manufacturing a rubber shoe sole.

(Conventional technology) Conventionally, two-color molded soles are made in advance by separate processes such as
A uniquely colored part such as a mark on the heel or sole is manufactured in advance, and the uniquely colored part is fixed at a predetermined location on the bottom of the concave part of the lower mold for forming the sole of the shoe, and then rubber,
It was manufactured by injecting synthetic resin and heating and pressurizing it.

In the conventional manufacturing method described above, it is necessary to manufacture unique parts such as the tread part, heel part, or mark of the sole in a separate process in advance, which requires an extra mold and molding process. Furthermore, depending on the manufacturing process, the parts may contract or expand and may not be able to be firmly fixed in place on the bottom of the concave part of the lower mold for sole molding without any gaps. However, the injected rubber or synthetic resin may enter the gap and bulge out, or the fixed position may move, giving the finished product an ugly appearance.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned drawbacks, and uses two upper molds for forming shoe soles in succession for one side of the lower mold for forming shoe soles, thereby achieving different color tones and functions. To provide a method for manufacturing a rubber shoe sole, in which a treading part, a heel part, etc., having elasticity can be integrally molded with other parts of the sole without protruding from each other.

(Means for Solving the Problems) The method for manufacturing a rubber shoe sole of the present invention has the following configuration.

A recessed part 1 of the lower mold X for forming soles, and a recessed part 3 formed on the bottom surface of the recessed part 1 and consisting of a partition peripheral wall 2 having a height protruding from the upper surface of the lower mold X for forming soles,
After loading or injecting a rubber base material 5 having abrasion resistance such as foamed polyurethane, the partition wall 2 is fitted into the upper concave portion 4 drilled on the lower surface of the upper mold Y for forming the sole of the shoe. After combining the molding upper mold Y and molding the primary molding member 5A by applying heat and pressure, the upper mold Y for sole molding is removed, and only the primary molding member 5A in the recess 3 is removed. The upper mold Z for forming a shoe sole is combined with the upper mold Z for forming a shoe sole, which has an upper recess 6 formed on the lower surface to cover the recess 1, the partition peripheral wall 2, and the recess 3 of the lower mold X for forming a shoe sole. By loading or injecting a rubber base material 7 having an anti-slip property such as butadiene rubber and having a color tone different from that of the rubber base material 5A into the recess 3 and heating and pressurizing it, the primary molded member 5A in the recess 1 and the recess are bonded. The secondary molded member 7A made of the rubber base material 7 of section 1 is integrally molded.

(Example) The method for manufacturing a rubber shoe sole of the present invention is shown in FIGS. 1 and 2.
As shown in the figure, a lower mold for forming a shoe sole
After loading or injecting the rubber base material 5 into the recesses 1 and 3 of the lower mold X for forming soles,
As shown in FIG. 3, an upper mold Y for sole molding having an upper recess 4 in the lower surface into which the partition peripheral wall 2 of the lower mold X for molding soles can be fitted is assembled and heated and pressurized.

Here, the partition peripheral wall 2 has a height that projects from the upper surface of the lower mold X for forming shoe soles, and
When the upper surface and the lower surface of the upper die Y for forming soles are brought into contact with each other, the upper surface of the partition peripheral wall 2 has a height such that it comes into contact with the surface of the upper concave portion 4.

Next, the upper mold Y for forming soles is removed, and as shown in FIG. Leave the primary molded member 5A as it is.

Thereafter, as shown in FIG. 5, the concave portion 1, the partition wall 2, the concave portion 3,
After combining the upper mold Z for forming a shoe sole with the lower mold X for forming a shoe sole, which has an upper concave part 6 having a width that covers 3 on the lower surface, the upper concave part 6 and the concave part 3 are A rubber base material 7 having a different color from the molded member 5A is loaded or injected, and heated and pressurized.

When the lower mold X for forming a shoe sole and the upper mold Z for forming a shoe sole are removed, the primary molded member 5A and the rubber base material in the concave portion 1 as shown in FIGS. 6 to 8 are removed. A rubber shoe sole G in which the secondary molded member 7A according to No. 7 is integrally molded is manufactured.

In the embodiments shown in FIGS. 1 to 8, the recessed portion 3 is formed in the stepping portion 3 on the toe side of the sole, but it may be formed in other locations such as the heel portion or the location where the mark is attached.

In addition to natural rubber and synthetic rubber, the rubber base materials 5 and 7 used in the present invention are made of elastic resin materials such as urethane, foamed polyurethane resin, and vinyl chloride. A material with wear resistance such as
The parts of the rubber base material 7 corresponding to the rubber base material 5
It is different from that and uses materials with anti-slip properties such as butadiene rubber and styrene rubber.

(Operations and Effects of the Invention) According to the method for manufacturing a rubber shoe sole of the present invention, the recess 1 of the lower mold X for forming a shoe sole, and the lower mold X for forming a shoe sole formed on the bottom surface of the recess 1 After loading or injecting a wear-resistant rubber base material 5 such as polyurethane foam into the recess 3 formed by the high partition wall 2 protruding from the upper surface, a hole is inserted into the lower surface of the upper mold Y for forming soles. The partition peripheral wall 2 is fitted into the upper concave portion 4 provided, and the upper mold Y for forming the sole is assembled, and after heating and pressurizing to form the primary molding member 5A, the upper mold Y for forming the sole is removed. At the same time, the primary molded member 5 of the recess 3
Only A is removed, and then an upper mold Z for sole molding is assembled, which has an upper recess 6 formed in the lower surface to cover the recess 1, partition peripheral wall 2, and recess 3 of the lower mold X for sole molding. At the same time, a rubber base material 7 having anti-slip properties such as butadiene rubber is loaded or injected into the upper concave portion 6 and the concave portion 3 in a color tone different from that of the primary molded member 5A, and heated and pressurized to form the primary molded member 5A. Secondary molded member 7
Since A is integrally molded, shrinkage or expansion of the primary molded member 5A can be avoided, and the partition peripheral wall 2 protrudes from the surface of the primary molded member 5A, so that the primary molded member 5A becomes the secondary molded member. 7A can be completely prevented from being mixed in, the primary molded member 5A and the secondary molded member 7A can be clearly distinguished and molded, and a shoe sole with excellent design and high commercial value can be provided.

Moreover, since the partition peripheral wall 2 has a height that projects from the upper surface of the lower mold X for forming soles, the primary molding member 5A in the recessed part 1 and the recessed part 3 can be completely separated and molded. Therefore, when only the primary molded member 5A in the recess 3 is removed, cutting, deburring, and other pretreatments are not required.

In addition, the rubber base material 5 is made of a wear-resistant material such as foamed polyurethane, and the rubber base material 7 is made of a material that has a different color tone from the rubber base material 5 and has anti-slip properties such as butadiene rubber. Since we use
It is possible to add functionality to the stepping part and heel part,
We can provide soles with high commercial value.

[Brief explanation of drawings]

Figure 1 shows the lower mold X for forming shoe soles used in the present invention.
FIG. 2 is an enlarged sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a combination of a lower mold X for forming a shoe sole and an upper mold Y for forming a primary sole according to the present invention. FIG. 4 is an explanatory diagram showing the state in which the primary molding member is placed. FIG. 5 is an explanatory diagram showing the state in which the primary molding member is placed. FIG. FIG. 6 is a plan view of the rubber sole according to the present invention, FIG. 7 is a sectional view taken along line BB in FIG. 6, and FIG. 8 is a bottom view of the sole. 1... Recessed part, 2... Partition peripheral wall, 3... Recessed part,
4... Upper concave portion, 5... Rubber base material, 5A... Primary molded member, 6... Concave portion, 7... Rubber base material, 7A
...Secondary molded member, F...Tread section, G...Sole,
X: Lower mold for forming shoe soles, Y: Upper mold for forming soles for primary forming, Z: Upper mold for forming shoe soles for secondary forming.

Claims (1)

[Claims] 1 Recessed part 1 of lower mold X for forming shoe soles and recessed part 1
A rubber base material 5 having abrasion resistance is loaded or injected into a recess 3 consisting of a partition wall 2 formed on the bottom surface of the shoe sole and protruding from the top surface of the lower mold X for forming shoe soles. The partition peripheral wall 2 is fitted into the upper concave portion 4 formed on the lower surface of the upper mold Y for sole molding, and the upper mold Y for sole molding is assembled, and the primary molded member 5 is heated and pressurized.
After molding A, the upper mold Y for sole molding is removed, and only the primary molded member 5A in the recess 3 is removed, and then the recess 1 and the partition of the lower mold X for sole molding are removed. An upper mold Z for forming a shoe sole having an upper recessed part 6 formed on the lower surface that covers the peripheral wall 2 and the recessed part 3 is combined, and the upper recessed part 6 and the recessed part 3 are provided with anti-slip properties in a color tone different from that of the rubber base material 5. By loading or injecting the rubber base material 7 and heating and pressurizing it, the primary molded member 5A in the concave portion 1 and the secondary molded member 7 made of the rubber base material 7 are formed.
A method for manufacturing a rubber shoe sole, characterized in that A is integrally molded.