Patent ID: 8114321
Filing Date: 2012-02-14
Classification: B29C,G05D

Abstract:
1. A method of controlling a thermal exchange liquid as it is circulated through an injection mold, die, or barrel (herein referred to as a “process”), the method comprising: establishing an energy set point, the energy set point being a desired rate of thermal energy exchange with the process; circulating the thermal exchange liquid through the process at a selected flow rate using a positive displacement pump coupled to a motor having a programmable and controllable speed which is independent of variations in line voltage; sensing an actual process inlet temperature and an actual process outlet temperature for the thermal exchange liquid; determining an actual flow rate of the thermal exchange liquid; computing an actual rate of thermal energy exchange between the thermal exchange liquid and the process according to the actual inlet and outlet temperatures and the actual flow rate; and computing and making an adjustment to the selected flow rate so as to correct the actual rate of thermal energy exchange to the energy set point.