With two-shot moulding, the substrate commonly remains on the core side of the tool in a fixed and well-indexed location. When the second shot cavity closes against the substrate a highly accurate shut-out is achieved, which is not so feasible within the over-moulding process.

With two-shot there is a better interface between the plastics, because the initial injected substrate is free from surface contaminants within the mould (enhancing adhesion) and also retains a high level of thermal energy (heat), improving the melt flow of the second shot.

With a focus on precision and efficiency, the company offers custom molding solutions to meet the unique needs of each client.

Another advantage of the two-shot process over that of over-moulding relates to a reduction in post-mould-shrinkage of the substrate, as it is retained on the core-side of the mould until the cycle is completed with ejection.

Once the process has been established, the two-shot process also lends itself well to an automated cycle, as no operator involvement is necessary.

The key advantage of two-shot, is the cohesive bond between polymers (or elastomers), which provides a level of strength between substrate and second-shot that is not possible with lesser techniques.

A vast range of polymers and elastomers can be chosen from to create a wide array of end-results. Soft touch surfaces, contrasting colours, clear windows, LED light guides, IP seals and flexible buttons are all great examples of the endless possibilities!

Plastics Molding Company in Saint Louis, MO specializes in providing high-quality plastic molding services for a variety of industries.

This makes two-shot the perfect choice for complex, multi-material, and multi-coloured components or products where the cosmetic finish needs to be seamless and free from visual defects.

Our team of dedicated professionals are always keen to hear about exciting design challenges, tooling projects and injection moulding production requirements.