JPS5829737B2 - Simultaneously molded products using different raw materials - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a product simultaneously molded using different raw materials, which is fusion-molded using different raw materials made of two or more types of expandable thermoplastic resin particles without mixing the respective raw materials. I'm trying to get .

In conventional foam molded products, when some parts require strength or some parts require chemical resistance,
Foamed molded products were manufactured separately using raw materials made of two or more types of expandable thermoplastic resin particles, and then combined into a single foamed molded product by means such as fitting or adhesion. However, there are various problems such as poor integrity due to adhesives coming off, and the fact that each molded item must be assembled by adhesives etc. in manufacturing, which is time consuming.In order to promote cost reduction, Improvements were also requested.

Therefore, the present invention provides a co-molded product made of different raw materials in order to solve the above-mentioned problems all at once.The structure is such that foamed polystyrene particles and foamed polyolefin/particles are made of mutually different materials. It is characterized in that it is composed of raw materials made of two or more types of expandable thermoplastic resin particles with different types, and the different types of raw materials are simultaneously molded without mixing, and their boundary parts are fused together. It is something to do.

Next, embodiments of the present invention will be illustrated below with reference to the drawings.

A shows the entire foam molded product, and 1 and 2 are parts made of materials made of foamable thermoplastic resin particles that are different from each other. They are molded at the same time and their boundary parts 3 are fused together, with 10 parts made of foamed polystyrene/resin and 2 parts made of foamed polyolefin resin (for example, foamed polyethylene resin). ),
Expanded polystyrene resin is inexpensive, but it is not oil resistant, so in order to achieve the required oil resistance in some areas, the two are molded simultaneously so that the central part is made up of expanded polyolefin resin. The boundary portion 3 of the material is fused together and is used, for example, as a packaging material for mechanical parts and other uses.

As a molding method to obtain a simultaneous molded product using different raw materials having the above configuration, the boundary portion of the mold cavity of a pair of splittable molds where the different raw materials are to be molded is connected with a large number of pins or comb-like objects in the partitioning direction. The partitioned mold cavities are separated by spaced members, and different types of raw materials are filled into the partitioned mold cavities, and immediately after the filling or during heating, the partitioned members are moved back and the different types of raw materials are filled. It may be integrally fused and molded.

In addition, in the above-mentioned simultaneous molded product using different raw materials according to the present invention, in addition to having the center part as the boundary part as in the above embodiment, the boundary part may be determined as appropriate depending on the type of the foamed molded product, such as a part of the corner. .

As described above, according to the present invention, two particles, such as expanded polystyrene particles and expanded polyolefin particles, are made of different materials.
It is composed of more than one type of raw material, and the different raw materials are molded simultaneously without being mixed with each other, so that their boundary parts are fused together, so the molding is in a state where the boundaries between the different raw materials are clearly expressed. Moreover, it has high integrity and is much stronger than conventional combination products, and can be molded with a correspondingly thinner wall thickness.

The molded product will have molded parts made of different materials, such as a combination of foamed polystyrene and foamed polyolefin, so foamed polystyrene with oil resistance is used to replace the parts where foamed polystyrene, which has poor oil resistance, is insufficient. By forming polyolefin, added value can be increased, and there are a wide variety of products that are adapted to the functions required depending on the application, such as those that require partial reinforcement, those that require chemical resistance, etc. This means that products with added value can be easily provided.

Furthermore, the above-mentioned device according to the present invention can save the labor of manufacturing and assembling the components separately, thereby contributing to cost reduction.

[Brief explanation of the drawing]

The figures illustrate an embodiment of the present invention, and FIG. 1 is a plan view, and FIGS. 2 and 3 are I-I lines and ■-■
FIG. A... Entire foam molded product, 1, 2... Constituent parts of the foam molded product made of different raw materials, 3... Boundary portion.

Claims (1)

[Claims] 1 It is composed of a raw material of two or more types of expandable thermoplastic resin particles of mutually different materials, such as expanded polystyrene/particles and expanded polyolefin particles, and the different types of raw materials are simultaneously molded without mixing and are mutually compatible. A simultaneously molded product made from different raw materials, characterized by the boundary parts being fused together.