Liquid Silicone Rubber Mold Design with Cold Runner

Overview of Liquid silicone injection molding

LSR Moulding is a manufacturing process that involves injecting liquid silicone into a mold cavity under high pressure.

The LSR injection Molding process is similar to plastic injection molding but uses liquid silicone instead of plastic. The liquid silicone is cured in the mold cavity to produce the final product.

Liquid Silicon Injection Molding has become a popular manufacturing technique in recent years because of its ability to produce high-quality rubber products with tight tolerances and complex geometries.

The process is ideal for producing small to medium-sized parts in large volumes.

There are the following forms during liquid silicone injection mould design:

1) Hot Runner with Edge Gate

It is a waste of materials, simple design, low cost, and mostly used for large products.

2) Cold Runner with Needle Valve

It can realize automation and short cycle.

3) Cold runner without needle valve

Due to the high expansion coefficient of LSR, it will expand when heated, but it will shrink slightly when cooled, so the parts can not keep accurate side distance in the mold. Therefore, cold channel processing can be used, LSR should keep low temperature and fluidity, cold channel adopts closed system, in the injection cycle, the closed system uses "sealing needle" or "needle valve" in each channel to control the accurate measurement of LSR material.

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