Coinjection molding refers to a process whereby two materials are injected into the same cavity. The first material is injected into the cavity and then followed by the second material as depicted in Fig. 1.26.
In this process, the first material goes to the outside of the mold and forms the skin, and the second material forms the interior of the part. This is often referred to as sandwich molding. Materials may be injected either sequentially or simultaneously. Applications include the use of an expensive outer layer and a cheaper core material or with fiber reinforced materials, where a skin material is used for improved surface quality.
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