High capacity injection molding apparatus

Details High capacity injection molding apparatus High capacity injection molding apparatus

1989-11-02

1991-04-30

Heitbrink, Timothy

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With accumulator, trap chamber, or serially arranged valves...

2643288, 425563, 425573, 425581, B29C 4506

Patent

active

050113992

ABSTRACT:
An injection molding machine has a high volume cylinder with a piston slidably disposed in the cylinder. The piston is formed with channels and check valves for selective communication from the back of the cylinder to the front of the cylinder. A vertically disposed screw plasticizer provides molten thermoplastic material to the back of the cylinder, which material flows to the front of the cylinder with rearward movement of the piston. When the front of the cylinder is filled with thermoplastic material, the piston is moved forewardly to inject the thermoplastic material into a mold. A reciprocating screw plasticizer first assists in filling the front of the cylinder, and then in completing the injection molding under a high pressure. Novel composite thermoplastic products may be produced.

REFERENCES:
patent: Re28721 (1976-02-01), Farrell
patent: 3335461 (1967-08-01), Schwartz
patent: 4070142 (1978-01-01), Farrell
patent: 4290701 (1981-09-01), Schad
patent: 4389358 (1983-06-01), Hendry
patent: 4498860 (1985-02-01), Gahan
patent: 4749536 (1988-06-01), Farrell

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