Closely paralleling RIM injection
molding, this rapid setting urethane process utilizes a
wide variety of materials. Both flexible and rigid urethanes
are available for use in this process. The two component
liquid urethane system is dispensed using specialized meter
mixing equipment. Depending on part geometry and material
specifications, either epoxy, urethane, silicone or aluminum
tooling is used. Most molds are made directly from models
of the finished part. These models can be made from many
different materials i.e. wood, plastic, metal, SLA, SLS,
etc…
Unlike injection molding, consistent wall thickness is not
required. Parts can be produced with a wall thickness as
thin as 1/16” and as thick as 1”+, all in the
same part. Threaded bushings and other features can be molded
in eliminating some secondary operations. Parts can be molded
in different colors or post mold painted. Depending on part
size and material chosen, up to 50 pieces per 8 hr. shift
can be produced. This process is capable of manufacturing
parts 250 cubic inches in volume and up to 48 inches in
length
