MOLD PRESSURE CONTROL APPARATUS

摘要

An apparatus for providing a uniform holding pressure in the mold cavity of an injection molding machine on successive cycles of the machine so as to insure a high degree of uniformity in the parts being produced. A signal representative of the pressure in the mold cavity is integrated over a predetermined time interval during the holding pressure phase of the machine cycle and this signal is compared with a reference signal. The error, if any, is used to adjust the holding pressure on the next cycle and thus maintain it at whatever value is represented by the reference signal.