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American Engineering Group is a leading full-service manufacturer of plastic, rubber, polymer and composite components. Some of our plastic products include nuts, bolts, washers, extrusions and tubing. We use injection molding, extrusion, blow molding and die cutting, so call today!
Reaction injection molding (rim molding) is a common type of fabrication
of plastic parts and components. Reaction injection molding is accomplished
by mixing two chemically-reactive substances (usually pre-polymers) together
and then injecting them into a mold. Once inside the mold, the reaction of
the two chemicals forms a thermoset polyurethane polymer part. The part is
removed from its mold and is tooled, inspected, finished and made ready for
delivery.
Reaction injection molded parts have been used in a number of commercial and
industrial applications. The molding process can create anything from light-weight
structural steel replacements to car bumpers. Advantages of rim molding over
other forms of production include: less air pollution created, large and lightweight
parts, varied thickness of parts, low tooling costs and freedom to design simple
or intricate items.
Rim molding also has a few drawbacks: the process has a slower cycle time
than other forms of plastic
injection molding, and the raw materials used in
rim molding are somewhat costly. Because of the usefulness of the process,
research into reaction injection molding was supported in the 1970’s
by the Department of Defense, NASA and other large organizations.
