초록 ▼

To obtain simultaneous filling of all cavities (K1-K4) in multicavity injection moulds, the mould cavity pressure (p) patterns in all cavities (K1-K4) are detected and the times (t1-t4) measured from the beginning of filling till a suitably chosen reference pressure (pR) is reached for each cavity (

To obtain simultaneous filling of all cavities (K1-K4) in multicavity injection moulds, the mould cavity pressure (p) patterns in all cavities (K1-K4) are detected and the times (t1-t4) measured from the beginning of filling till a suitably chosen reference pressure (pR) is reached for each cavity (K1-K4). By interventions in the individual heating systems of the individual hot runners (5), the temperatures in these are altered to bring the measured times of the individual cavities more in line.

대표청구항 ▼

[ What is claimed is:] [1.] A process for monitoring and controlling the filling of plastic injection moulds with multiple cavities fed with molten material via a hot-runner system whose temperature is controllable, the process comprising:measuring pressure in each cavity;measuring a time interval f

[ What is claimed is:] [1.] A process for monitoring and controlling the filling of plastic injection moulds with multiple cavities fed with molten material via a hot-runner system whose temperature is controllable, the process comprising:measuring pressure in each cavity;measuring a time interval from a fixed point in a filling phase to when a certain adjustable reference pressure of the mould cavity pressure is reached in each cavity;the reference pressure lying above a measured pressure at the end of a volumetric filling phase but below a measured lowest maximum pressure in the cavities; andadjusting the temperatures in the hot runners individually so that the measured time intervals are kept close with their differences tending towards zero.