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What are the types of plastic injection molding?

2023-11-07
There are four main types of plastic injection molding techniques:

1. Standard Molding: This is the most basic technique where a single color and material are used to produce the part. It is commonly used for manufacturing beverage containers, caps, auto parts, and toys.

plastic parts


2. Overmolding: This technique involves a two-step process to produce items that require two different types of plastic. The substrate part is first produced, and then each part is individually moved to another mold where another thermoplastic is molded over the substrate. This is commonly used for producing items with soft outer materials for improved grip.

overmolding
3. Insert Molding: In insert molding, a prefabricated part made of an alternative material (often metal) is used as the substrate. The substrate is inserted into the mold, and then plastic is injected onto it. This technique is often used for producing items like knobs and dials with a plastic exterior over a metal interior.
Insert molding

4. Two-Shot (Dual-Shot) Molding: This technique allows for the creation of a part or product using multiple colors and plastic types simultaneously, without the need for a multi-stage assembly process. It is done in one molding press, where a substrate is first injected by the primary press barrel, and then mold steel is exchanged for the second shot. This technique is commonly used for creating products with branded-color handles or multiple color components.

Two-Shot (Dual-Shot) Molding

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