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Injection molding is used extensively for the manufacture of polymeric items. A reciprocating/rotating screw both melts polymer pellets and provides the pressure required to quickly inject the melt into a cold mold. The polymer cools in the mold and the part is ejected. Injection molding machines are sized primarily by the force available in the mold clamping unit; ranging from 20 tons in laboratory machines to over 5000 tons in large commercial machines.

Process Schematic

(Click to enlarge)

injection molding


An introduction to injection molding can be found in:
Gerd Potsch, Injection Molding: An Introduction, Hanser Publishers, New York (1995) ISBN 1-569-90193-7.
There is even a magazine devoted to injection molding:
Injection Molding Magazine

Suppliers of Injection Molding Machines

Boy Machines
Cincinnati Milacron

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