RIM (Reaction injection molding) is a molding process to produce plastic molded parts. During the reaction injection molding process, Isocyanides and Polyolefin (along with other ingredients) are mixed together in a mixing mechanism in a fluid mode and then injected into a mold as a liquid mass. The liquid mass’ solidification takes place in the mold just as the mixed liquids are involved in a reaction with tool surface’s heated surface.

The benefit of this process is a low clamping force required for the mold, the low-pressure conditions of the molding process and lengthy material travel paths. The necessary molds could be made quickly and cost-effectively with the use of aluminium.

Molded parts manufactured in the RIM procedure compete with parts from injection molding, fibreglass layup, and thermoforming. The liquid masses of the RIM process possess a more beneficial flow behaviour when compared to injection molding because of the low viscosity of the material since they are not a thermoplastic. Therefore, much longer flow paths could be arrived at with the same wall thickness than what’s obtainable with the other traditional molding processes.

Several benefits to Reaction Injection Molding (RIM)

The very low molding temperatures and pressures for the reaction injection molding process give it numerous advantages:

  • Designers have more creative opportunities with Reaction Injection Molding (RIM) due to the fact that it could easily mold thick and thin walls in the same part.
  • Economical low-cost tooling for large parts and/or low production volumes.
  • Insert molding and encapsulation of delicate components are a lot easier with RIM because temperatures and pressures are low. This can decrease your assembly expenses, solve sealing problems for you or make assemblies tamper-proof.
  • Economical set-ups for brief production runs mean Reaction Injection Molding (RIM) is well suited to JIT deliveries for both Kan Ban and low production volumes.