Fully automatic molding: no flash, no runner, automatic demoulding
Regarding the fully automated molding process, people have carried out research from various aspects such as injection machines, molds, and materials. It not only saves manpower in process operation, but also reduces material costs because it does not produce useless solidified products. From the perspective of taking into account environmental protection, this method is also attracting attention. For the molding of micro products such as skeleton oil seals for automobiles, the molding cycle (from injection to the next injection) is required to be within 10s, which can be completed in a very short time.

Composite molding: insert molding, binary molding
Because the form of the crosslinking reaction is addition curing, it can be molded at relatively low temperatures. Since no by-products such as peroxide decomposition residues are generated during the cross-linking reaction, secondary vulcanization is not necessary in principle. Therefore, it can be integrally molded with the resin, and insert molding by coating the primer material, and the binary molding that integrates the sealing part and the skeleton part has also begun to spread.

Silicone rubber has excellent properties (heat resistance, plug resistance, weather resistance, electrical insulation, flame retardancy, etc.). Due to these properties, eco-friendly molding based on fully automatic molding, integral molding with metals and organic resins, is possible. In addition, the material itself is transparent and colorable, so its application range involves many fields, such as (computer, mobile phone, etc.) buttons, milk bottle nipples, (copiers, printers, etc.) rubber rollers, pipe joint seals, oil seals, etc. Various auto parts, TV picture tube anode caps, diving supplies, etc.

Material for automatic molding without glue edge/runner
In the injection molding of liquid silicone rubber, a method called edgeless, runnerless molding has become popular. This is a molding method that does not produce useless cured products and does not require secondary processing, that is, a molding method that does not have a sprue or runner (even if there is no curing), and does not generate waste rubber edges. In order to implement this molding method, the structure of the model and the smoothness of the parting surface, the metering and discharge accuracy of the injection machine must meet the requirements, and even in terms of materials, it must be a material that is difficult to generate waste rubber edges, and the glue entering the mold cavity must meet the requirements. After filling the mold cavity, due to the excessive amount of rubber or the thermal expansion of silicone rubber, the rubber flows into the parting surface and becomes a waste rubber edge after curing. If the parting surface is designed to be narrower, it will be difficult to generate the waste rubber edge, but at the same time, the air will not be easily discharged, so it becomes the reason for the air bubbles in the finished product.

Cure characteristics of molding materials for the waste-free edge. Compared with the previously used materials, the curing curve of this material is in a state of sharp inflection (very short time from the beginning of curing to the end of curing). By selecting the proper injection conditions for this type of material, curing has not yet started before the material fills the cavity, and the material has good fluidity, and when the material fills the cavity, curing ends immediately, even if there is residual pressure, the material will not Flow onto the parting surface to prevent the formation of scrap edges.