Liquid silicone rubber (LSR) injection is a leading-edge technology that requires specific technical tooling. There are two different types of technology: open nozzles and needle nozzles. The choice between the two depends on the quality specifications of the finished part.
Liquid silicone has a very low viscosity index and requires perfect seals of the mould cavity in order to guarantee a burr-free finished product. As injections are carried out at high temperature, steel dilation and natural shrinkage of materials must be considered at the design stage of the liquid silicone rubber (LSR) injection tooling.
CVA Silicone's expertise lies in this comprehensive know-how that is unique in the world of liquid silicone rubber (LSR).
In order for CVA Silicone to manufacture and assemble a stronger and easier Liquid Silicone Rubber (LSR) component, the company needs to follow the fundamental golden rules for Liquid Silicone Rubber (LSR) parts, linked to the injection molding technics.
The injection molding of Liquid Silicone Rubber (LSR) implies various constraining factors that force the R&D team to take into consideration numerous information, for example:
The shape and all the final features of the Liquid Silicone Rubber (LSR) part chosen by the customer will depend on the way the Liquid Silicone Rubber (LSR) is mixed, injected, where and how fast, and how the material reacts with the different temperatures into the mold. Designing the mold with the Virtual Molding Software SigmaSoft allows us to plan for the perfect dimensions and constraints, to minimize stress, reduce flash, and obtain a flawless part.
To provide the best product, its perfection starts from the machining of the mold. Because Liquid Silicone Rubber (LSR) is present on high constraints markets, the mold needs to offer the best quality in term of precision. It takes a certain amount of time and a lot of accuracy for the company to build a mold capable of handling up the Liquid Silicone Rubber (LSR) injection molding process, representing the majority of the investment costs. However, thanks to the strong know-how and expertise of our team, CVA Silicone is now able to master the machining of tailor-made molds.
Liquid Silicone Rubber (LSR) exists in a wide range of types and grades. Based on the final use, our customers, in co-development with our R&D team, can select the most adapted material, with a soft touch, or with a high transparency level (i.e for the optic industry) from a range of hardness. CVA Silicone can manufacture Liquid Silicone Rubber (LSR) parts that need to deal with higher temperatures or to be implanted under the skin by mixing additives and other fillers.
Today, thanks to the development of the self-adhesive Liquid Silicone Rubber (LSR), CVA Silicone offers solutions for over-molding applications.