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Plastic Moulding Processes - Double Shot Injection Moulding, or Co-Moulding
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Double shot, multi-shot injection moulding (often known as co-moulding) is the process of injection moulding a part having more than one type of colour or material within the one injection molding tool. The different materials are injected in sequence, each one attaching to, or overmoulding the previous shots. Special multi-shot injection moulding machines are required to carry out this type of molding.
Advantages of the co-moulding process include faster cycle time due to not having to transfer the part to another tool, and the reduction of handling errors in between shots. Disadvantages are the higher cost of the tooling.
Some typical applications for double shot injection molding are the moulding of assemblies having different colors such as automotive tail light lenses, fresnel lense molding, overmoulding hard plastic parts with softer ‘grip’ surfaces, moulding of soft seals and vibration mounts directly onto a harder plastic base parts.
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