DRAGGING DETECTING METHOD AND APPARATUS OF PLASTIC MOLDING MACHINE

摘要

PROBLEM TO BE SOLVED: To substantially prevent a dragging phenomenon by estimating and/or judging the dragging phenomenon beforehand. SOLUTION: In a plastic molding machine, the resin material supplied from a hopper 10 is kneaded and melted by the screw 14 in a barrel 12 and extruded to a T-die 16 to be molded. A radiation thermometer 44 detecting the radiation intensity corresponding to the temp. profile of the molten resin in screw grooves in the barrel 12 and the surface temp. profile of the main flights of the screw is arranged at least in the melting part of the barrel 12 and a dragging foreknowing means 50 estimating and/or judging the dragging phenomenon of the screw 14 to the barrel 12 from the waveform and/or temp. abnormality change between both tmemp. profiles is connected to the radiation thermometer 44.