CLOSED LOOP CONTROL FOR AN INJECTION UNIT

摘要

A method is provided for improving melt quality in an injection unit. A closed loop control system regulates operation of the injection unit in accordance with a reference value for at least one operating parameter. A sensor measures the present value of a load upon the motor which drives an injection screw during operation of the injection unit. A processor compares the present value of the load to a reference value for the load. If the present value of the load deviates from the reference value of the load by more than a predetermined amount, then the processor adjusting the reference value of the at least one operating parameter. Operating parameters can include barrel temperature, back pressure and screw RPMs.