The Liquid Injection Molding (LIM) process starts with a two part liquid silicone compound formula ( A & B parts) that are delivered at a fixed ratio, typically 1:1, from material drums or pails by a hydraulic or pneumatic metered pumping system to a static mixer. The static mixer blends the two components into a homogenous suspension; this mixing process activates the compounds platinum cure system. The liquid silicone material from the static mixer flows to the injection unit. The LSR material is then injected into the mold cavity through a runner and gate system where it is held in the mold under high pressure and elevated temperature until material is cured (rubber is vulcanized). The cycle time is established to reach an optimal level of cure. At the end of the cycle, the parts are removed or ejected from the cavities and the next cycle begins.
Disadvantages of Injection Molding vs. other rubber molding methods:
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