Liquid injection molding (LIM)



Process that involves an integrated system for proportioning, mixing, and dispensing dual-component liquid resin formulations and directly injecting the resultant mix into a mold which is clamped under pressure. During LIM, pumping systems deliver a two-part liquid silicone (catalyst and crosslinker) directly into a mixer for homogenization. Using a relatively low pressure, the mix is then injected directly into heated mold cavities in as little as 3 to 10 seconds. Molding and vulcanization (curing) occur inside the mold cavities within 10 to 90 seconds due to the high mold temperature. This all takes place within a completely closed system, which helps assure cleanliness.

LIM process offers many benefits, including:

  • Cleanliness with minimized contamination risk
  • No material preparation labor
  • Lower injection pressure
  • Faster cycle rates
  • Consistent part quality