Method of molding thermoplastic material

Details Method of molding thermoplastic material Method of molding thermoplastic material

1988-10-17

1990-07-31

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

264 85, 264101, 425812, B29C 4563, B29D 2200

Patent

active

049449109

ABSTRACT:
A process for molding a thermoplastic material includes the aspect of venting fluid through a bore in a valve member of a nozzle body through which thermoplastic material flows. The nozzle body is communicated with a mold space into which the thermoplastic material flows. The mold space is defined by mold surfaces. Then the valve member is actuated to allow thermoplastic material to flow through the nozzle body into the mold space. Subsequently, pressurized fluid is allowed to flow through the valve member bore into the thermoplastic material in the mold space to form a cavity in the thermoplastic material. Then the valve member is actuated to terminate the flow of thermoplastic material through the nozzle body. The pressurized fluid is allowed to flow through the valve member bore into the fluid cavity. Finally, the pressurized fluid is vented from the fluid cavity to the valve member bore.

REFERENCES:
patent: 4101617 (1978-07-01), Friederich
patent: 4106887 (1978-08-01), Yasuike et al.
patent: 4136220 (1979-01-01), Olabisi
patent: 4333608 (1982-06-01), Hendry

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