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The Plastic Molding Processes

1. Injection Molding: In Injection Molding, melted plastic is forced into a mold cavity. Once cooled, the mold can be removed.

2. Blow Molding: Blow molding is like injection molding except that hot liquid plastic pours out of a barrel vertically in a molten tube.

3. Compression Molding: In this type of plastic molding, a slug of hard plastic is pressed between two heated mold halves.

4. Film Insert Molding: This plastic molding technique imbeds an image beneath the surface 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 high-pressure gas to fill the mold cavity with plastic.

6. Rotational Molding: Hollow molds packed with powdered plastic are secured to pipe-like spokes that extend from a central hub.

7. Structural Foam Molding: Structural foam molding is a process of plastic molding usually used for parts that require thicker walls than standard injection molding.

8. Thermoforming: In this plastic molding process, sheets of pre-extruded rigid plastics are horizontally heated and sucked down into hollow one-piece tools. When the hot plastic solidifies, its shape conforms to that of the mold.

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