Material injecting method and material measuring apparatus in injection molding machine
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United States of America Patent
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-
Jun 6, 1989
Grant Date -
N/A
app pub date -
Feb 12, 1987
filing date -
Jun 17, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An injection molding method operable in conjunction with an injection molding machine having an injection screw which rotates and moves backward while a preset dosage of molding material is injected into the molding machine. As the injection screw moves backward its arrival at a predetermined point relative to a discharge nozzle is detected by a sensor which initiates stoppage of feeding of material into the machine. Further backward movement of the injection screw resulting from internal pressure in the injection cylinder is arrested by an adjustably locatable stopper, disposed behind the injection screw. The stopper is designed to be located at a position that produces molded products of consistent quality. Further, in accordance with a preferred embodiment of the invention, the stop position of the injection screw is also used as a starting point for the injection screw in a subsequent injection step during which the dosage of material is injected into a molding cavity.
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