Silicon injection molding and variety of ways

Silicon Injection molding services produce molded parts made from silicon. Silicone rubber is a 2 part, flexible and synthetic rubber-like material from silicone elastomers that can be cured at room temperature into a powerful elastomer used in molding. It is durable, heat resistant and free of allergens or leachable chemicals. Liquid silicone is similar to general silicone but has different processing features. It is purchased as a 2 part raw material with a grease-like viscosity.

Nowadays the silicone molding parts made by liquid silicone injection molding are becoming very vital. One reason is the increased performance needs of the finished articles. Further, more and more producers of rubber parts are viewing advantages in the high level of automation and productivity.

Different ways of silicon molding

Silicone injection molding
Silicone injection molding

Molding processes used by providers of liquid silicone injection molding services contain cast molding, dip molding, compression molding, rotational molding, reaction injection molding, and transfer molding.

While in the cast molding process, liquid stuff is poured into an open mold, in solidity molding a slug of silicone is pressed between two heated mold halves. On the other hand dip molding is a process similar to warm dip coating, in which the finished product is the fused plastisol stripped from the dipped mold.

Anyway in injection molding, liquid silicone is forced into a chilled mold under wonderful force. In the RIM process, 2 or more reactive chemicals are combined at high speed as they are being injected into a mold. In rotational molding hollow molds packed with silicone material are secured to pipe-like spokes that spread from a central hub. In transfer molding, the 2 mold leaves are clamped combine and silicone is forced by pressure into the mold.

Why the favored use of silicon rubber in injection molding

Silastic silicon rubber is shear stuff and so its viscosity depends on shear rate. As the shear rate increases, the product becomes lower in viscosity. It is this effect that is extremely favorable for the injection molding process. At the starting of the injection process speed profile should be programmed in such a way that the volume flow is top sufficient for the liquid silicon rubber-not to start to vulcanize before the cavity is filled, in order to reject scorch of the material. Thus liquid silicon rubber is largely used for the process of injection molding due to its following features:

  • Simple mixing and pigmentation
  • Solventless with low and flexible viscosity.
  • Quick processing matched to solvent dispersion and generally permits a full coating to be applied in one pass.

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