Reaction Injection Moulding (Liquid Injection Moulding)

Abstract

Reaction injection moulding (RIM), alternatively and probably more realistically called liquid injection moulding (LIM), or sometimes high-pressure impingement mixing (HPIM), is essentially a ‘one-shot’ process for moulding polyurethane elastomers by carrying out the reaction and moulding process through the sequence of steps shown in Fig. 6.1, which represents a true one-shot process in which all the liquid components are individually metered and pumped to the mixer, where they are thoroughly mixed and then dispersed.