Two-shot or overmolding refers to a process whereby either different colors or different materials are molded into one part. In this process, the first material or color is injected, then the mold is rotated, and the second shot is injected as depicted in Fig. 1.27.
An alternative method is to use a retractable core. In this case, the first material is injected, cooled to solidify, and then the core is retracted to allow injection of the second material as shown in Fig. 1.28.
Bonding is accomplished through either strictly mechanical means or by adhesion between the two components through diffusion of the chains. This can result in parts with two materials combined without the need for an additional adhesive bonding step. In the case where direct adhesion of the materials is desired, proper selection of compatible materials is required. Table 1.8 shows the bonding strength for a number of thermoplastic combinations for use in multicomponent injection molding.
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