Method for producing physically foamed injection moulded parts

Details Method for producing physically foamed injection moulded parts Method for producing physically foamed injection moulded parts

2006-02-21

2006-02-21

Kuhns, Allan R. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

C264S050000, C264S053000, C425S00400R, C425S146000, C425S149000

Reexamination Certificate

active

07001549

ABSTRACT:
A process for producing physically foamed injection molded articles is provided. The process involves feeding a propellant-free thermoplastic melt into a cavity followed by delivering a physical propellant directly into the cavity or directly into the melt flowing into the cavity. The pressure exerted on the propellant during the injection stage is greater than that exerted on the propellant during the holding phase.

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