Plastic and nonmetallic article shaping or treating: processes – Treatment of material by vibrating – jarring – or agitating... – By reciprocating or vibrating mold
Patent
1994-08-01
1996-04-30
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Treatment of material by vibrating, jarring, or agitating...
By reciprocating or vibrating mold
264161, 2643287, 2643288, 264334, 425554, 425555, 425556, 425566, 425DIG51, B29C 4557, B29C 4540, B29C 4538
Patent
active
055122230
ABSTRACT:
A local pressurizing type injection molding apparatus including a stationary die, a movable die disposed for movement into and out of contact with the stationary diet a first local pressurizing pin extending through the movable die and having a tip facing a gate, and a second local pressurizing pin extending through the movable die and having a tip facing the cavity. The apparatus is further provided with first advancing mechanism for advancing the first local pressurizing pin, second advancing mechanism for advancing the second local pressurizing pint and a device for individually setting the points in time at which advancing movements of the first local pressurizing pin and the second local pressurizing pin are started and for individually setting the pressurizing pressures given by the first local pressurizing pin and the second local pressurizing pin. One processing action is given to a molded product by advancing the first local pressurizing pin while another processing action is given to the molded product by advancing the second local pressurizing pin. Accordingly, in the case where two or more kinds of processing operations are performed, the processing operations can be started at different points in time and can be effected with different pressures.
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Heitbrink Jill L.
Sumitomo Heavy Industrie's, Ltd.
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