Reaction Injection Molding
RIM
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Definition:
A fabrication technique involving the extremely rapid impingement mixing of two chemically reactive liquid streams, injected into a mold that results in the simultaneous polymerization, cross-linking and formation of the part. This technique is a form of liquid injection molding (LIM). When short fibers (1.6 mm), carbon or mineral fillers are incorporated into one of the liquids to increase modulus and reduce coefficient of expansion the process is referred to as reinforced reaction injection molding (RRIM). RIM resin systems include epoxy which mold over continuous strand mat and preforms as well as polyurethane/polyester hybrids, polyurea and poly(DCPD).
Definition Copyright ©1989 CRC Press LLC. All rights
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