Runner gating system design, cold runner forming is one of the important processing features of liquid silicone.

1. A cooling system needs to be designed inside the cold runner: the forming of the cold runner is very different from the hot runner system. The inside of the cold runner needs to be designed to transport water, and an effective thermal insulation layer should be set up between the cavity and the cold runner. temperature transfer. If the runner is too hot, the material starts to solidify before injection, and the product is prone to cracking and no glue.

2. The cold nozzle needs to design a closed system, automatic production, and shorter cycle: the design of the cold nozzle needs to use a needle valve type closure system, the glue port is designed to be between 0.5-0.8mm, and the valve needle system needs to be designed with a height-adjustable structure , easy to fine-tune the flow through the needle valve.

The cold nozzle needs to be designed with a glue quantity control system: for micro-products such as injection molded silicone seals, the product weight is less than 1 gram, and a precise glue quantity control system needs to be designed to ensure that the glue quantity in the flow channel can be controlled and adjusted.