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140. The process of plastic molding

Now many people are interested in the plastic molding. But few people know the process of the plastic molding. So we introduce some things to you. If you want to know, you can read about below.

1. Injection Molding

In Injection Molding, liquified plastic is forced into a mold hole. Once cooled, the mold can be removed. This plastic molding process is sometimes used in mass production tooling or prototyping of a product.

2. Blow Molding

Blow molding is like injection molding except that hot liquid plastic pours out of a barrel vertically in a molten tube. The mold closes on it and forces it outward to comply with the inside shape of the mold. When it is cooled, the hollow part is made.

Equipments required in setting-up a blow molding business are comparatively higher than injection molding.

3. Compression Molding

In this kind of plastic molding, a slug of hard plastic is pressed between 2 heated mold halves. Compression molding usually uses vertical presses rather than the horizontal presses used for injection and blow molding. The parts formed are then air-cooled. Costs of equipments used for compression molding are moderate.

4. Film Insert Molding

This plastic molding technique imbeds an image beneath the outside of a molded part. A material like film or fabric is inserted into a mold. Plastic is then injected.

5. Gas Assist Molding

Also called gas injection molding is used to create plastic parts with hollow interiors. Partial shot of plastic is then followed by hi-pressure gas to fill the mold cavity with plastic.