Preplasticizing injection machine

Details Preplasticizing injection machine Preplasticizing injection machine

1996-09-17

1998-06-23

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

With means to heat or cool

26432819, 425557, 425587, 425812, B29C 4554

Patent

active

057702454

ABSTRACT:
There is provided a preplasticizing injection machine including a resin vent formed in the injection cylinder behind the plunger stroke wherein said resin vent is connected to a pressure reducing device and/or an inert gas feeding machine. The resin entrapped in the clearance prevents gases generated within the cylinder from being exhausted and it may be blackened due to the oxidation thereof. According to the present invention, these problems can be solved by the above construction. Furthermore, a band heater is provided on the outer surface of the cylinder behind the injection plunger stroke over the resin vent to prevent the entrapped resin from being solidified.

REFERENCES:
patent: 3263276 (1966-08-01), Maier
patent: 3481001 (1969-12-01), Stillhard
patent: 4390332 (1983-06-01), Hendry
patent: 4749536 (1988-06-01), Farrell
patent: 4946356 (1990-08-01), Kumazaki
patent: 5030080 (1991-07-01), Fukuda et al.
patent: 5253994 (1993-10-01), Zweig et al.
patent: 5364255 (1994-11-01), Yokoyama
patent: 5380187 (1995-01-01), Fujikawa

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