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Method and apparatus for thermally controlling a mold, die, or injection barrel

  • US 8,114,321 B2
  • Filed: 02/13/2006
  • Issued: 02/14/2012
  • Est. Priority Date: 02/14/2005
  • Status: Active Grant
First Claim
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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.

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