JPS5971852A - Synthetic-resin multi-quality material injection laminated shape - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A method for firmly bonding 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 molding multi-color or multi-material materials is how to reliably adhere the secondary molded product to the pre-formed primary molded product. To achieve adhesion without using adhesives, an undercut of the secondary molding is provided on the primary side, or the high pressure of the molten secondary molding acts on the already solidified primary molding, causing the contact surface to There are two ways to use materials that can be expected to have a certain degree of weld penetration.

The former method can be achieved by forming an undercut in the mold, such as an angular pin type or a core plastic set, but it has the disadvantage of requiring a mold with a complex structure.

Furthermore, the latter method has drawbacks such as a limited range of application due to restrictions on the materials used.

The present invention provides a synthetic resin multi-material laminate molded product that reliably and firmly fixes primary and secondary molded products using a mold with a simple structure without being subject to the well-known complex mold structure and material constraints. This is related to.

An embodiment of the synthetic resin multi-material injection laminate molded product of the present invention, for example a shoe sole, will be described below.

The injection molding machine is a multi-color or multi-material injection molding machine. For example, an injection molding machine uses primary molding resin,
Each injection device for supplying resin for secondary molding is equipped facing each other, and is also equipped with a moving mold, a rotating device equipped with an ejector device, an empty wire device, a mold opening device, etc.

The molding mold includes two movable molds 1.1 of the same shape, a primary molding mold 5 provided with a recess 3 for forming the protrusion C, and a secondary molding mold 7. use.

As shown in FIG. 1, the method for producing a multi-material injection laminate molded product includes two identical movable molds 1.1 on the left and right having cavities 2 in which the next molded product A is to be formed, in a rotating device 10 of a molding machine. is attached, and the right movable metal 91 is provided with a recess 8 for forming the protrusion C, and a primary molding metal having a cavity 4 to form a contact surface with the secondary molded product B. The mold 5 is clamped accordingly, and a molten material of high-friction and wear-resistant resin such as polyamide (nylon 6, nylon 66), urethane resin, etc. is injected from the injection device 6 for synthetic resin for blow molding. The primary molded product A is then cooled to form a primary molded product A that serves as a ground contact surface with protrusions C disposed on the contact surface (inner surface) with the secondary molded product B.

Next, when the primary molding mold 5 is opened, the primary molded product A having the protrusions C disposed thereon is held in the right movable mold 1 in a solidified state.

Therefore, the rotating device 10 is rotated 180 degrees to the left, so that the right movable mold 1 corresponds to the secondary molding mold 7, and the left movable mold 1 corresponds to the primary molding mold 5. , etc. are clamped, the melted resin for primary molding is injected from the injection device 6 for the synthetic resin for primary molding, and at the same time the resin for secondary molding is injected. Inject a molten material such as a soft urethane resin containing a foaming agent, cool each injected resin,
On the left side, a secondary molded product B, which provides cushioning properties for the contact surface between the movable mold 1 and the secondary mold 7 with the sole of the foot, is laminated and molded on the existing primary molded product A. Next, the product S1 of the secondary molded products A and B is formed into a shoe sole. On the right side, a primary molded product A is molded using the moving mold 1 and the primary molding mold 5 on the right, in which a protrusion C is provided. Next, the secondary molding mold 7 and the blow molding mold 5 are opened, oil is supplied from the oil supply pipe 12 through the rotary valve 11, and the ejector 18 is operated to produce the primary and secondary molded products A.

Extrude the laminate molded product S of B. Furthermore, the same rotary valve 11 is rotated to supply oil from the oil supply pipe 14 to the ejector 18.
return to its original position. Thus, cavity 2 of the left moving mold 1
becomes a protruding chamber and returns to a moldable state at any time.

In the present invention, the protrusions C disposed on the inner surface of the secondary molded product A are formed longer than the thickness of each part of the secondary molded product B where each of the protrusions C is located. The mold 7 buckles or curves during mold closing.

Therefore, during molding of the secondary molded product B, the secondary molding resin that has flowed into the cavity 9 of the secondary molding die 7 causes the aforementioned protrusion C that has been deformed by the aforementioned buckling (becoming a flat head) or curving. is embedded with its upper top exposed on the upper surface of the secondary molded product B, and as shown in FIG. B can be mutually constrained.

In the above example, if the same resin is used as the resin for the secondary molded product and the resin for the secondary molded product, the secondary molded product B
During molding, the inner surface of the secondary molded product A is welded to the secondary molded product B, and together with the restraining properties of the projections C, the primary molded product A and the secondary molded product have an even stronger restraining property. A laminate S of B can be manufactured.

However, in the present invention, the second and second molding resins are different types of synthetic resins, for example, a urethane resin is used for the second molded product, and foamable butadiene styrene is used for the second molded product. Even in this case, both resins are difficult to dissolve during secondary molding, but as mentioned above, due to the restraining properties of the protrusions C provided on the inner surface of the secondary molded product A, A strongly bonded laminate S of molded products A and H can be manufactured. Therefore, the present invention makes it possible to produce a laminate product in which the secondary molded product A and the secondary molded product B are firmly bonded to each other without being subject to the t)tlJ limitations of the resin material.

Of course, according to the present invention, the secondary molded product A.

By using resins that use two types of coloring agents, for example, titanium oxide and antimony blue, for each resin for B, it is possible to easily produce multicolor laminate molded products with two layers of white and blue that are strongly adhered. .

Shoes using the above-mentioned multi-layer or multi-colored laminated soles,
In contrast to the bending of the sole of athletic shoes, in the present invention, each protrusion C on the inner surface of the primary molded product A has its upper apex exposed on the upper surface of the secondary molded product B to form a secondary molded product. Since it is configured to be embedded in B, the restraint with the secondary molded product B is strong, and separation of the secondary molded products A and H is absolutely impossible.

Indeed, if two types of thermoplastic synthetic resins are selected and used appropriately,
Durable synthetic resin shoe soles can be manufactured at a relatively low cost.

Furthermore, in the present invention, due to the strong restraint due to the deformation of the projections C, there is no need for an expensive molding die with a complicated structure that constitutes an undercut. We can provide this at a low price.

Regarding another embodiment of the present invention, the instrument case shown in FIGS. 4 and 5 can be manufactured by using a molding machine similar to that of the previous embodiment and a mold with a different cavity shape. . That is, a transparent window I, which is a primary molded product A, is injection molded using acrylic, and AB containing a coloring agent is molded.
When S or polycarbonate is injected to form the secondary molded product B, the main body ■, the protrusions C disposed on the inner surface of the secondary molded product A deform and exhibit their restraining properties, and the transparent window I It is possible to manufacture a two-color laminated instrument case that is firmly attached to the main body ■.

In the present invention, various shapes and numbers of projections C to be arranged on the inner surface of the primary molded product A can be considered depending on the requirements of the molded product, but the simplest shape is a rod shape. The protrusion C of the bottle point gate shown in FIG. 8 can also be used.

As described in detail above, the laminate product of the present invention is -Next molded product A
By buckling (flattening) or curving the protrusion C disposed on the inner surface of the protrusion C, the upper part of the protrusion C is exposed to the upper surface of the secondary molded product B and is embedded in the secondary molded product B. Therefore, the laminate S of the secondary molded products A and H reliably and firmly maintains the same temperature, and even if the laminate S is subjected to elasticity due to bending and stretching motion, the two layers will not peel off or cause damage. No heat is generated during desorption.

Furthermore, the movable molds 1, 1, the blow molding mold 5, and the secondary molding mold 7 used in this manufacturing can be inexpensive molds with a simple mechanism that does not require an undercut structure, making it economically robust. 161
Multi-layered or multi-colored laminate molded products S can be produced.

Moreover, because of the restraining properties of the protrusions C, the combination of different synthetic resins can be freely selected without being constrained, regardless of the adhesion properties of the secondary and secondary molding resins. It has the feature of being able to manufacture synthetic resin laminate molded products that match the intended use of the product.

Furthermore, since there are no restrictions on the combination of synthetic resins, the present invention has various effects, such as being able to provide inexpensive laminate molded products by appropriately using inexpensive pine resin suitable for the purpose of use and price. It has a wide range of applications.

[Brief explanation of drawings]

The drawings relate to embodiments of the present invention, and Fig. 1 is a cross-sectional explanatory diagram showing the molding relationship between the molding machine and the molded product, and Fig. 2 shows the main parts of the movable mold and the primary molding plate, and the primary molded product. 3 is a cross-sectional view of the sole of the laminated molded product of the present invention, and FIG. 4 is a front view of the instrument case of the embodiment of the present invention.
5 is a sectional view taken along the line Y-Y in FIG. 4, FIG. 6 is a bottom view of the sole of another embodiment of the present invention, and FIG. 7 is a sectional view taken along the line vn-vn in FIG. 6. FIG. 8 is a cross-sectional view of an example of the protrusion C. l... Moving mold, 2... Cavity, 8... Recess, 4... Cavity, 5...-Mold for blow molding, 6
... Injection device, 7... Secondary molding mold, 8... Injection device, 9... Cavity, A...-Next molded product,
B... Secondary molded product, C... Protrusion, S...
-Next, laminated products of secondary molded products. Patent Applicant: Furuyani Gyo Co., Ltd. Figure 3 A Figure 5 Figure G

Claims (1)

[Claims] 1. Each protrusion C arranged on the inner surface of the primary molded product A has a longer shape than the thickness of the secondary molded product B in which it is located, and is deformed by buckling or curving, causing its upper top to double. A synthetic resin multi-material injection laminate molded product, characterized in that the secondary molded product A and the secondary molded product B are mutually constrained by an embedded molded part exposed on the upper surface of the secondary molded product B.