Liquid Injection Mold Production

Liquid Silicone Rubber Molding / Liquid Injection Mold

Liquid Injection Molding Manufacturing Process

Liquid Injection Molding can be realized by different methods. The machines used to produce liquid silicone parts can be compression machine, and LSR injection machine.

Liquid Silicone Molding by Compression Machine with Compression Mold

The compression machine need to be upgraded with an extra liquid silicone feeding system. There are two common LSR feeding system. One system is an manipulator that can extract liquid silicone from the A & B barrels and inject LSR automatically to the open compression mold. Another LSR feeding system for compression machine is like the system used in LSR injection machine, directly injecting the liquid silicone through the sprue and runner to the closed compression mold.

Liquid Injection Molding by LSR Horizontal Injection Machine

Liquid Injection Mold used in LSR horizontal injection machine is the complicated injection mold with cold runner system. The feeding of material is controlled by the needle valve (a piston nozzle). The liquid silicone is directly injected to each cavity through the nozzle. The needle valve can accurately control the amount of LSR to each cavity, which is beneficial for size control of product, and can make sure the LSR products doesn't be polluted by outside environment.

The liquid injection mold can be with ejectors and sliders. So it is more appropriate for the parts with complicated geometry. The ejectors can also help to take off the LSR parts from the mold cores automatically by air blowing.

Liquid Injection Molding by LSR Vertical Injection Machine

The LSR Injection Mold is same as the above one, just different in the production machine used. LSR injection molds with cold runner system can be used in vertical injection machine and horizontal machine. LSR parts that need overmolding or not easy demoulding, operation via vertical injection machine is easier.

Liquid Silicone Injection Molding Machine

Liquid Injection Mold (LIM)

Liquid Injection Mold (LIM) is a process in which liquid silicone rubber (LSR) is injected into a heated mold under pressure, completely filling the cavity before curing into a solid part which is then ejected from the mold. This process is virtually identical to the injection molding of thermoplastic polymers, except for the fact that LSR is a thermoset polymer.

For Liquid silicone injection molds need cold runner system (water system), some need nozzle shut-off valves, some do not need shut-off needle valves, which mainly depends on liquid silicone rubber products design, quality requirement and quantity demands etc.