Injection molding machine and method for determining closure...

Details Injection molding machine and method for determining closure... Injection molding machine and method for determining closure...

2011-07-19

2011-07-19

Gupta, Yogendra N (Department: 1744)

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Molding pressure control means responsive to pressure at...

C425S145000, C425S557000, C425S589000

Reexamination Certificate

active

07980844

ABSTRACT:
Torques and resin pressures applied to a screw are detected during the forward movement of the screw and coefficients of correlation between the detected torques and resin pressures are calculated. When the check ring is open, the flight of the screw receives resin pressure, and the screw torque increases proportionally to the resin pressure due to resin backflow, so the coefficients of correlation between the screw torques and the resin pressures are higher than a reference value. When the check ring closes, the flight of the screw no longer receive resin pressure, so the screw torque decreases and the coefficients of correlation become lower than the reference value. The check ring is determined to be closed when the coefficients of correlation become lower than the reference value.

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EP Search Report for 08103947.1 dated Oct. 13, 2008.

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