REACTION INJECTION MOLDING
Reaction injection molding (RIM) is also known as liquid
reaction molding or high- pressure impingement mixing.
The low pressure method involves mechanical mixing often
with plural component dispensing equipment rather than by
impingement and immediately injects the mixture into the
closed mold cavity. These reactive polymer resins such as
polyols, isocyanates, polyurethanes, and polyamides
provide fast molding cycles well suited for automotive
and furniture applications. Common RIM parts include
automotive bumpers, fender and panel components,
appliance housings, and furniture components.
When short fibers or flakes are used to produce a more
isotropic product, the process is called reinforced
reaction injection molding (RRIM). Many hybrids such as
polyurethane/urea, polyurethane/polyester hybrid systems
are currently being used as well as those for RIM already
mentioned.
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Web Author: Terry Price (tprice@cerritos.edu)
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Last update: 11/14/01 |
