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Injection Molding Process

2K (two-shot) Molding

Description

Molding two plastics together to form one part with two colors or different materials into one part. 2K Molding is done in a single injection mold machine with 2 or more injection units and with a tool that has 2 cavities that rotate between molding cycles to allow for multiple material parts. On the core side of the tooling are two identical cores beside each other. On the cavity side is one cavity that is only for the substrate or first shot. The second cavity is for the substrate or overmold shot. With each shot, the same machine makes a new substrate in one cavity and a final overmolded part in the second cavity.


This process provides a complex part with two materials that are chemically bonded to each other. Examples of this type of molding are toothbrushes, surgical instruments, or power tool handles.

Benefits

Great process for 2 material parts that are:

  • Higher volumes – Over 10,000 parts
  • Mid level to full production programs
  • Materials that have strong chemical bonding properties

injection molding

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