Injection/compression molding refers to the process wherein the cavity is not completely filled during injection of the resin. In this process, the resin is injected while the mold is slightly open. The two halves of the mold then close, distributing the resin and filling the cavity. This process is useful for products that require high surface replication, such as compact discs or optical parts. Thin-walled parts can also be molded by this process, as the pressure losses are reduced, and there is less risk of premature resin solidification. Figure 1.23 illustrates this process.
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