JP2627246B2 - Injection molding shoe molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
More specifically, the present invention relates to a method for molding an injection-molded shoe in which an insert piece is embedded in a shoe sole by injection molding.

[0002]

2. Description of the Related Art Conventionally, as shown in Japanese Patent Application Laid-Open No. 3-4, a cushion body is fixed to the lower surface of the middle bottom of a sill suspended with a needle-like projection or an adhesive. Combine the bottom mold with the side mold at the bottom to form a sole forming cavity, inject the sole molding material into this sole forming cavity, form the sole into the sole, and cushion the sole in the sole. A method of embedding is proposed, but skill is required to accurately position and fix the cushion body at a predetermined position on the lower surface of the middle bottom with an adhesive, adhesive, and pierce and fix the needle-like projection. In this case, when the shoe having the completed shoe sole is removed from the last, the cushion body is damaged by the needle-shaped protrusion.

[0003]

SUMMARY OF THE INVENTION According to the present invention, an insert piece is easily buried and formed accurately at a predetermined position on a shoe sole by injection molding.

[0004]

The present invention will be described below with reference to the drawings showing an embodiment of the present invention. The present invention comprises a last 1 on which a cover a is suspended, a side mold 2.2, and an insert chamber 31 on the upper surface. The upper bottom forming cavity 01 is formed on the lower surface of the upper cover a by the dummy bottom mold 3 in which the insert pieces b are set in the insert chamber 31, and the upper bottom forming material is injected into the upper bottom forming cavity 01 to form the upper cover a. After the upper bottom c is integrally formed on the lower surface of the insert mold and the insert piece b is insert-molded on the upper bottom c, the dummy bottom mold 3 is replaced with the bottom mold 4 and the lower bottom is formed on the lower surface of the upper bottom c and the insert piece b. A molding cavity 02 is formed, a lower bottom molding material is injected into the lower bottom molding cavity 02, and an upper bottom c is formed.
SUMMARY OF THE INVENTION The gist of the present invention is a method of molding an injection-molded shoe, characterized in that the insert piece b is embedded in the shoe sole S by integrally molding the lower sole d with the lower surface of the insert piece b. .

In the present invention, the dummy bottom mold 3
May be formed so as to be surrounded by a partition wall continuously protruding in a band shape, or may be surrounded by a large number of independent protrusions protruding at regular intervals. Alternatively, a recess 311 may be provided on the upper surface of the dummy bottom mold, and the recess 311 may be formed.

In the present invention, the insert b is used for a shoe sole such as a soft foam, a cushion such as an air bag, a felt, a shock absorber, a hard rubber, a plastic plate, a fiber reinforced plastic plate, and a shank body such as a metal plate. And is punched and formed so as to be freely insertable according to the shape of the insert chamber 31.

In the present invention, if the insert piece b is made of a material that is compatible with the upper sole molding material or the lower sole molding material, the insert piece b can be embedded in the shoe sole S in a bonded state. The strength of the sole can be significantly increased, which is convenient.

In the present invention, the upper and lower sole molding materials are usually used for injection molding materials for shoe soles, such as vinyl chloride, polyurethane, 1.2 polybutadiene, and a block copolymer of styrene and butadiene. Things are used. If the upper or lower sole molding material is made of a transparent or translucent material, the insert b can be seen through the upper or lower sole c or the lower sole d, so that the shoe sole is visually visible. It can be.

In the present invention, after injection molding the lower bottom d, if necessary, the bottom mold 4 is replaced with a second bottom mold, and an outer bottom forming gap is formed on the lower surface of the lower bottom d. It is also possible to inject a molding material and form the outer bottom integrally with the lower surface d of the lower surface.

[0010]

Since the present invention is constructed as described above, the insert piece b is simply inserted into the insert chamber 31 of the dummy bottom mold 3 before the upper bottom injection molding, so that the shoe can be easily formed by injection molding. The insert piece can be buried accurately at a specified position of the bottom S. In addition,
A part of the hole b ′.
b '..., the insert piece b and the upper bottom C
And the adhesive strength between the shell and the sheath a
You.

[Brief description of the drawings]

FIG. It is principal part sectional drawing which shows an upper bottom molding state. B. It is principal part sectional drawing which shows a lower bottom molding state.

[Explanation of symbols]

 01. Top and bottom molding cavity 011. Void 02. Lower bottom molding cavity Last 2. Side mold 3. Dummy bottom mold 31. Insert chamber 311 ... recess 4. Bottom mold a. Cap b. Insert piece b '... hole c. Upper bottom d. Lower sole S. Shoe sole

Claims (1)

(57) [Claims] An insert chamber (31) is provided on the upper surface of the last (1) in which a cover (a) is suspended, a side mold (2.2), and a space between the lower surface of the cover (a) and the insert piece (b).
011 and a hole b ′. With b '…
The upper bottom molding cavity 01 is formed on the lower surface of the upper shell a by the dummy bottom mold 3 on which the insert piece b to be set is set, and the upper bottom molding material is injected into the upper bottom molding cavity 01, and the upper lower molding cavity is formed on the lower surface of the upper shell a. The bottom c is integrally formed by injection molding, and the upper bottom forming material is formed into a hole b ′.
After the insert piece b is insert-molded on the upper bottom c by anchoring to the b ′... , the dummy bottom mold 3 is replaced with the bottom mold 4, and the lower bottom molded cavity 02 is formed on the lower surface of the upper bottom c and the insert piece b. Burying the insert b in the shoe sole S by injecting the lower sole molding material into the lower sole molding cavity 02 and integrally molding the lower sole d on the lower surface of the upper sole c and the lower surface of the insert piece b. A method for molding injection-molded shoes, characterized in that: