Abstract
Extensive use of flexible polyurethane fascia on automobiles has established RIM (Reaction Injection Molding) as a viable plastic molding process. Improvements in this process are continuously occurring which increase productivity, versatility, and the competitive economics of RIM versus other plastic molding techniques such as compression molding or thermoplastic injection molding. This paper examines the relative economics of state-of-the-art RIM versus these other molding techniques to make large, complex parts. Factors considered include productivity, raw material consumption and cost, process energy, tooling, fixturing, hourly labor and capital. Developments in RIM technology such as internal mold release promises to further increase the attractiveness of the RIM process.
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