Reaction Injection Molding (RIM)

    Reaction injection molding (RIM) is also known as liquid reaction molding or high- pressure impingement mixing. The low pressure method involves mechanical mixing often with plural component dispensing equipment rather than by impingement and immediately injects the mixture into the closed mold cavity. These reactive polymer resins such as polyols, isocyanates, polyurethanes, and polyamides provide fast molding cycles well suited for automotive and furniture applications. Common RIM parts include automotive bumpers, fender and panel components, appliance housings, and furniture components.

    When short fibers or flakes are used to produce a more isotropic product, the process is called reinforced reaction injection molding (RRIM). Many hybrids such as polyurethane/urea, polyurethane/polyester hybrid systems are currently being used as well as those for RIM already mentioned.

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