JPS6161801B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shoe sole in which a synthetic resin with excellent abrasion resistance and a synthetic resin with high elasticity and excellent cushioning properties are integrally molded through fabric, and a method for manufacturing the same. .

BACKGROUND ART A method for firmly adhering a primary molded product and a secondary molded product using a two-color injection molding machine or a multi-material injection molding machine for synthetic resin products is conventionally well known.

The most difficult problem in multi-color or multi-material molding is how to reliably adhere a secondary molded product to a pre-formed primary molded product.

In other words, in order to fix the product without using adhesive, it is necessary to provide an undercut for the secondary molding on the primary side, or to apply high pressure from the molten secondary molding to the already solidified primary molding, so that the contact surface There are two methods: using materials that can be expected to blend in to a certain extent.

The former method can be achieved by configuring the mold with an undercut such as an angular pin type or core puller type, but it has the disadvantage of requiring a mold with a complicated structure.

The latter method is subject to limitations in terms of the materials used, so it has drawbacks such as a limited range of application.

The present invention relates to a shoe sole in which a primary molded product and a secondary molded product are reliably and firmly fixed together using a simple mold without the need for the well-known mold with a complicated structure, and a method for manufacturing the same. It is.

That is, the present invention integrally molds a synthetic resin with excellent abrasion resistance such as polyamide type or urethane type and fabric b, thereby producing a primary molded product A consisting of a contact surface layer a and fabric b.
is formed, and on top of the fabric b of this primary molded product A, a highly elastic material such as soft urethane containing a foaming agent is added.
The mounting surface layer c is formed by secondary molding a synthetic resin with excellent cushioning properties, and the ground surface layer a and the mounting surface layer c are made of fabric b.
This is a shoe sole integrally molded through a shoe sole and a method for manufacturing the same.

The sole according to the present invention, as shown in FIG.
A tread layer a is formed on the entire surface of the tread surface of the sole using a synthetic resin such as polyamide or urethane with excellent abrasion resistance, and a fabric b is formed on the side of the tread layer a to which the shoe upper is attached. A mounting surface layer c made of a synthetic resin with excellent elasticity such as soft urethane containing a foaming agent is formed through the tread, and the tread surface layer a and the mounting surface layer c are integrally molded through the fabric b. be.

Next, a method for manufacturing a shoe sole according to the present invention will be explained using an example using the sole manufacturing apparatus shown in FIGS. 1 to 3.

The injection molding machine uses a well-known multi-color or multi-material injection molding machine.
Equipped with injection devices 6 and 8 facing each other for supplying resin for primary molding and resin for secondary molding, and equipped with a rotating device 10 equipped with a moving mold 1 and an ejector device, a mold clamping device, a mold opening device, etc. are doing.

The molding mold is equipped with two movable molds 1 and 1 of the same shape on the left and right having a cavity 2 for forming the ground surface of the primary molded product A, and the needle 3 for fixing the dough b is moved into the right movable mold. A mold 5 for primary molding having a plurality of cavities 4 protruding from the mold 1 and forming a contact surface with the mounting surface layer c, and a mold for secondary molding having a cavity 9 forming a mounting surface for attaching a shoe upper. Mold 7
use.

As shown in FIG. 1, the rotation device 10 of the injection molding machine is equipped with two left and right movable molds 1 of the same shape each having a cavity 2.
A fabric b having the same shape as the sole contact surface is fixed to the needle 3 of the primary molding mold 5 disposed opposite to the
This mold 5 for primary molding is clamped correspondingly to the moving mold 1 on the right, and the molten synthetic resin for primary molding is injected from the injection device 6 and cooled, and the mold is placed on the contact surface side with the mounting surface layer c. A primary molded product A consisting of a ground layer a on which a fabric b is integrally arranged is formed.

When this primary molding mold 5 is opened, the right movable mold 1 holds the primary molded product A with the dough b disposed thereon in a solidified state.

The rotating device 10 is rotated 180 degrees counterclockwise to make the right movable mold 1 correspond to the secondary molding mold 7, and the left movable mold 1 to correspond to the primary molding mold 5, After these primary molding molds 5 and secondary molding molds 7 are clamped, the melted resin for primary molding is injected from the injection device 6 for primary molding, and at the same time the synthetic resin for secondary molding is The molten material is injected from the injection device 8 for secondary molding, each injected resin is cooled, and on the left side, a mounting surface layer c in charge of cushioning properties is laminated onto the existing primary molded product A, and here A laminate B consisting of a ground surface layer a, a fabric b, and a mounting surface layer c,
In other words, the sole of the shoe is formed.

On the right side, the right moving mold 1 and the primary molding mold 5 form a primary molded product A in which the dough b is integrally arranged.

Next, the secondary molding mold 7 and the primary molding mold 5 are opened, and the oil supply pipe 1 is passed through the rotary valve 11.
2, and the ejector 13 is operated to push out the laminate B.

Furthermore, the same rotary valve 11 is rotated to supply oil from the oil supply pipe 14 and return the ejector 13 to its original position.

In this way, the cavity 2 of the left movable mold 1 becomes empty and returns to a moldable state at any time.

Then, rotate the rotating device 10 again by 180 degrees to the left,
On the right side are the left movable mold 1 and the primary molded product A in the empty cavity 2, and on the left side are the right movable mold 1 holding the primary molded product A in the cavity 2 and the secondary molding mold 7. The primary and secondary molding resins are similarly injected, cooled, molded, and the molds are opened to form laminate B.
By repeating a series of operations to push out the ground plane layer a,
To automatically and continuously manufacture a shoe sole which is a laminate B consisting of a fabric b and a mounting surface layer c.

In the above embodiment, the primary molded product A was arranged over the entire ground contact surface of the shoe sole, but FIGS. 5 and 6
As shown in the figure, it may be arranged only on the forefoot and heel of the sole.

Further, the fabric b used in the present invention can be a woven fabric, a nonwoven fabric, a knitted fabric, etc. Depending on the type of fabric, it may not be raised, but there are some fabrics in which it is particularly preferable to be raised.

By raising the cloth b, the raised hair has penetrated into the synthetic resin layer, and the synthetic resin has formed in the cloth b.
It penetrates between the fibers of the synthetic resin and the fabric b to strengthen the adhesion between the primary molded product A and the mounting surface layer c.
and are firmly adhered together via the fabric b.

Examples of the synthetic resin used in the present invention include:
For primary molding (for contact surface layer a), synthetic resins with excellent abrasion resistance such as polyamide (nylon 6, nylon 66), urethane, etc., for secondary molding (for mounting surface layer c).
As the material (for example), a synthetic resin with high elasticity and excellent cushioning properties, such as a soft urethane resin containing a foaming agent, can be used.

Even when different types of synthetic resins are used, for example, urethane resin for primary molding and foamable butadiene styrene resin for secondary molding, both resins are difficult to weld during secondary molding, but as mentioned above, The fabric b placed on the primary molded product A allows the primary molded product A to
It is possible to create a laminate B in which the mounting surface layer c and the mounting surface layer c are firmly adhered.

In addition, if two types of colorants, for example, titanium oxide and antimony blue, are used in the synthetic resins for the ground plane layer a and the mounting surface layer c, a strongly fixed multicolor laminate of two layers of white and blue can be formed. Molded products can also be easily produced.

As described above, in the present invention, since the ground plane layer a and the mounting surface layer c are integrally formed through the fabric b,
It is possible to ensure strong adhesion and provide an excellent sole that does not peel off during use.

In the shoe sole manufacturing method according to the present invention, the tread layer a is made of polyamide (nylon 6,
A primary molded product A is formed by integrating a synthetic resin with excellent abrasion resistance such as 66) type, urethane type, etc. and fabric b, and this is made of a soft urethane resin containing a foaming agent with high elasticity and cushioning properties. Since the mounting surface layer c is made of a synthetic resin with excellent wear resistance and is integrally molded on the secondary side, the synthetic resin with excellent wear resistance and the soft urethane resin containing a foaming agent have high elasticity and cushioning. Synthetic resins with excellent properties can be selected depending on the purpose of the shoe sole, and the mold has a simple structure and is easy to operate.The finished shoe sole also has the durability of two hard and soft layers. To provide a lightweight and durable shoe sole with excellent performance at a low cost.

The sole of the present invention is produced by integrally molding a synthetic resin with excellent abrasion resistance such as polyamide or urethane and a fabric b to form a primary molded product A consisting of a tread layer a and a fabric b. On top of the fabric b of the primary molded product A, a synthetic resin with high elasticity and excellent cushioning properties, such as soft urethane containing a foaming agent, is further molded to form the mounting surface layer c, and the contact surface layer a and Since the sole is made by integrally molding the mounting surface layer c and the fabric B by injection molding, the adhesion between the two is strong, and the back of the foot (mounting surface layer c) is highly elastic and cushioning. The tread surface side (touch surface layer a) has excellent durability, and both of these combine to provide a comfortable shoe sole that is wear resistant, durable, lightweight, and durable. .

In addition, synthetic resins with excellent abrasion resistance such as polyamide (nylon 6, nylon 66) and urethane, and synthetic resins with high elasticity and excellent cushioning properties such as soft urethane resin containing foaming agents, are suitable for the application. By appropriately selecting and using thermoplastic synthetic resins such as, it is possible to manufacture durable synthetic resin shoe soles at relatively low cost.

Since the present invention integrally molds the contact surface layer a and the mounting surface layer c through the fabric b, there is no need for an expensive mold with a complicated structure that constitutes the undercut, resulting in an inexpensive shoe sole. can be provided.

[Brief explanation of the drawing]

The drawings relate to embodiments of the present invention; Fig. 1 is a cross-sectional explanatory diagram showing the molding relationship between the injection molding machine and the molded product, and Fig. 2 shows the main parts of the movable mold and the primary mold, and the dough. FIG. 3 is a cross-sectional view showing the relationship between the main parts of the movable mold and the primary mold and the primary molded product. FIG. 4 is a cross-sectional view showing the relationship between the moving mold and the primary molding mold, and FIG. 5 is a bottom view of the ground-contacting side of the sole of another embodiment of the present invention, and FIG. 6 is a cross-sectional view of FIG. 5.
FIG. A... Primary molded product, B... Laminate, a... Ground surface layer, b... Fabric, c... Mounting surface layer, 1... Moving mold, 2... Cavity, 3... Needle, 4 ...Cavity, 5...Mold for primary molding, 6...Injection device, 7...Mold for secondary molding, 8...Injection device, 9
... Cavity, 10... Rotating device, 11... Rotary valve, 12... Oil supply pipe, 13... Ejector, 14... Oil supply pipe.

Claims (1)

[Scope of Claims] 1. A ground layer a made of a synthetic resin with excellent abrasion resistance such as polyamide or urethane, and a synthetic resin with high elasticity and excellent cushioning properties such as soft urethane containing a foaming agent. A sole formed by integrally molding the mounting surface c and the fabric b. 2. The shoe sole according to claim 1, wherein the fabric b is made of a raised fabric. 3 A movable mold 1 having a cavity 2 and a fabric b of the same shape as the sole contact surface are attached to the needle 3 of the primary mold 5 and the corresponding mold is tightened to form a wear-resistant material such as polyamide or urethane. Injection device 6 for superior synthetic resin
The mold is injected to form a primary molded product A that integrates the contact surface layer a and the dough b, and while this primary molded product A is held in the cavity 2, the movable mold 1 is moved to the secondary side. Then, the secondary molding mold 7 having the cavity 9 and the movable mold 1 are clamped correspondingly, and a synthetic resin with high elasticity and excellent cushioning properties, such as soft urethane containing a foaming agent, is injected from the injection device 8. A method for manufacturing a shoe sole, comprising: forming a mounting surface layer (c) by injection, and integrating the contact surface layer (a) and the mounting surface layer (c) via a fabric (b).