Patent ID: 6309571
Filing Date: 2001-10-30
Classification: B29C

Abstract:
A method for the control of injection molding and the determination of a transfer point from injection velocity control to packing pressure control comprising:sensing a nozzle pressure or cavity pressure in a mold at discreet time intervals;calculating a differential of the sensed nozzle or cavity pressure at said discreet time intervals;calculating at least one input based on said differential pressure for input into a fuzzy inference systemapplying knowledge from said fuzzy inference system and outputting a value indicating a suitable time to transfer from injection velocity control to packing pressure control; andwherein said input is calculated by using dP(i+1)/dP(i) where dP(i+1)=P(i+1)-P(i) and P(i) denotes the pressure at the ith sampling time interval.