JPH04197301A - Injection molding method of shoe sole - Google Patents

Abstract

PURPOSE:To insert-mold an insert piece in a specified position of a shoe sole by raising an insert piece by injection pressure to be pressed and held on the base of an upper mold, and insert-molding an insert piece in the upper surface of a shoe sole. CONSTITUTION:A shoe sole molding material is injection-introduced from an injection gate 12, and an insert piece (a) is raised by injection pressure, taking a partition wall for forming an insert chamber as a guidance wall 111 to be pressed and held on the base of an upper mold 2, thereby molding a shoe sole (b). At this time, piercing needles 21, 21... are projected opposite to the insert chamber 11 on the base of the upper mold 2, and while the insert piece (a) set in the insert chamber 11 is raised, it pierced by the piercing needles 21, 21.... When the shoe sole (b) is injection-molded, with the insert piece (a) held in a specified position of a bottom mold 1, the insert piece (a) can be correctly insert-molded according to a specified position on the upper surface of the shoe sole (b).

Description

[Detailed description of the invention] (Industrial application field) This invention relates to an injection molding method for shoe soles.

(Prior art) Conventionally, according to Utility Model Application No. 48-112541, a reinforcing piece such as a shank or an insert piece such as a lightweight material such as cork foam is pierced into a piercing needle embedded in the bottom of an upper die. A method has been proposed in which a shoe sole molding material is set on the bottom of a mold and injected into a sole molding cavity formed on the bottom surface of the insert piece to form the shoe sole, and the insert piece is embedded and molded into the shoe sole. ing.

However, positioning the insert piece with respect to the upper mold is complicated, and when the upper mold is set in the bottom mold or the sole body is injection molded, the insert piece may fall off from the upper mold, resulting in the sole not meeting the specified specifications. It was difficult to insert-mold the insert piece in the position.

(Problems to be Solved by the Invention) The present invention attempts to insert-mold an insert piece at a prescribed position in the sole of a shoe using a simple method.

(Means for Solving the Problems) The present invention will be explained below with reference to drawings showing the state of implementation of the present invention.In the present invention, an insert piece a is set in an insert chamber 11 formed on the bottom surface of a bottom mold 1, an insert piece
- Inject the shoe sole molding material through the injection gate 12 formed on the bottom of the chamber, and use the partition wall 111 that constitutes the insert chamber as a smooth guide wall to insert the insert piece a by injection pressure.
Summary of the invention is an injection molding method for a shoe sole, which is characterized in that the sole is molded by raising and holding it in pressure contact with the bottom surface of the mold 2, and at the same time insert-molding an insert piece a on the upper surface of the shoe sole. That is. In the present invention, the insert chamber 11 is defined by a partition wall Ill protruding from an arbitrary position of the bottom mold, and the partition wall Ill may be provided with a cut portion if necessary, so that the insert chamber can be opened. The fluidity of the introduced sole molding material into the sole molding cavity O may be promoted.

In this invention, piercing needles 21, 21, etc. are provided on the bottom surface of the -1-type 2 so as to face the insert chamber 11, and the insert piece a set in the insert chamber 11 is inserted into the insert piece a.
If the shoe sole is injection molded while the insert piece a is held at the specified position of the hole mold 1 by inserting it into the puncture needle 21. The insert piece a can be accurately insert-molded by the position of .

Moreover, in this case, the piercing needle 21 .
A fitting hole a' is formed on the "-" side of the insert piece a corresponding to 21.
, a″ are provided, and the tip portion 211 . of the piercing needle is provided.
211... is partially inserted into the fitting holes a'' and a' of the insert piece a, the injection pressure will cause the insert piece a to
When raising the insert piece a, the insert piece a is further raised by -1- using the piercing needles 21, 21, . . . as guiding pieces. Therefore, it is possible to more accurately mold the insert piece a into the sole of the shoe.

The insert piece a is arbitrarily selected depending on the usage function of the shoe sole to be molded. For example, if the purpose is to make the sole of a shoe lighter and absorb shock, it may be made of lightweight material such as rubber, synthetic resin foam, cork, or felt, and the sole is made of multicolored material. If there is one, it will consist of a different kind of moon from the sole of the shoe.

Then, the insert piece a is punched and cut or molded according to the shape of the insert chamber 11, and its side surface aI
+ is formed in close contact with the inner wall surface 11.0 of the insert chamber and is slidable on the inner wall surface 110.

In this invention, if the insert piece a is made of a colored material and the shoe sole is made of a transparent material, the insert piece a can be seen through the shoe sole, and the function of the insert piece a can be visually emphasized.

In this invention, the insert piece a is first fitted into the insert chamber 11 and set, and the sole molding material is injected through the injection gate 12 opened at the bottom of the insert chamber 11. The insert piece a rises through the insert chamber 11 under pressure and is pressed against the bottom of the mold 2, and the sole molding material is injected into the partition wall 1.
11 and the insert piece a pressed against the bottom surface of the mold 2, the shoe sole is introduced into the shoe sole molding cavity O, and the shoe sole is molded, and the molded shoe sole bl-
Insert piece a is insert-molded on the surface part.

(Effects of the Invention) The present invention is designed to raise the insert piece a set in the insert chamber 11 as described below by using the partition wall Ill that partitions the insert chamber as a guide wall, while Since the insert piece a is held in pressure contact with the shoe sole, the insert piece a can be inserted-molded at the specified position of the shoe sole while the insert piece a is accurately held at the specified position on the bottom surface of the mold 2 during shoe sole molding. Moreover, the holding of the insert piece a against the bottom surface of the upper mold 2 is also carried out using injection pressure, which is simple.

[Brief explanation of the drawing]

The drawings show the state in which the present invention is implemented, and FIG. 1 shows the insert piece set in the bottom mold, and FIG. 2 is a sectional view of the main part showing the state of injection molding of the sole. . (Explanation of symbols) 0, sole molding cavity 1, bottom mold 10, sole molding cavity 11. Insert chamber 110
...Inner wall surface 111...Division wall 12...
・Gate 2. Upper mold 21, piercing needle
a, insert piece al, fitting hole
a”...Side, sole

Claims (1)

[Claims] Insert chamber 11 formed on the bottom surface of bottom mold 1
The insert piece a is set in the insert chamber, and the sole molding material is injected through the injection gate 12 formed on the bottom of the insert chamber.
Using the partition wall 111 constituting the insert chamber as a smooth guide wall, the insert piece a is raised by the injection pressure and held in pressure contact with the bottom surface of the upper mold 2 to form the sole b, and the insert piece a is placed on the upper surface of the sole. An injection molding method for shoe soles that involves insert molding.