Method for reducing cycle time in an injection molding machine

Details Method for reducing cycle time in an injection molding machine Method for reducing cycle time in an injection molding machine

1994-04-18

1995-10-03

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26432819, 425562, B29C 4554, B29C 4518

Patent

active

054549957

ABSTRACT:
The method of the present invention relates to reducing cycle time in injection molding machines that are running large capacity molds, such as multiple cavity preform molds, and require a high volume supply of quality melt. Specifically, the present invention proposes using a continually plasticizing extruder to supply two melt accumulators which will alternately operate to inject the plastic material into the mold. To accomplish this, a rotary valve at the end of the extruder is controlled to fill the pots, and ball check valves are positioned to control flow direction and limit pressure in certain parts of the system. A shuttle valve between the shot pots and before the nozzle facilitates decompression.

REFERENCES:
patent: 3296353 (1967-01-01), Nouel
patent: 3417433 (1968-12-01), Teraoka
patent: 3861841 (1975-01-01), Hanning
patent: 3940223 (1976-02-01), Farrell
patent: 3945784 (1976-03-01), Collins
patent: 4734243 (1988-03-01), Kohama et al.
patent: 5281384 (1994-01-01), Banks

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