Abstract
The use of reaction injection molding (RIM) and reinforced reaction injection molding (RRIM) for the production of large parts, especially in automotive applications, is currently quite commonplace.1 In the RIM process, shown schematically in Figure 1, two liquid components are pumped at high throughputs and pressures to a self cleaning impingement type mixing head and then into a mold where the polymerization reaction occurs and the part is formed within seconds.2 RRIM is basically the same process but short fibers or fillers are added to one or both of the components in order to obtain various special properties. Certain equipment modifications must be made in order to handle the viscous, and often abrasive slurries.
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