Two Shot Molding

About Two Shot Molding

Two-shot molding features two or more different thermoplastics molded together in a single cycle. Other experts call this technique either dual-shot, double-shot, or multi-shot molding. With this, two-shot molding allows parts to improve their designs and functionality by combining two or more plastic parts. This helps to cut down on the need for post-molding assembly, which could become costly and inefficient.

Like overmolding, two-shot molding is a multi-injection process that involves two (or more) different materials to combine a single part. The difference between overmolding and two-shot molding is that in two-shot, the parts form a molecular bond rather than a mechanically or chemically induced bond. During this process, the machine injects one material into the mold, cools, and then is transferred to another cavity. Rotating 180°, the first meets the second substrate when the second is injected into that mold. This creates a firm bond between the two.

Two-shot molding is best for those high volume operations. This is because of its efficiency and economy in producing highly durable and long-lasting assemblies and parts. This is especially true for those assemblies that have complex geometric shapes and colors to create beautiful and seamless products. Conversely, two-shot can require a special machine to create the parts and assemblies. Otherwise, engineers would have to compromise with time and labor to make the transfers during that process. This can make introductory costs high for many looking into this option. For lower volumes, overmolding might be a better option.

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