Injection molding tool heating method involves controling temperature difference across the tool by measurement of feed and return line temperatures and controling fluid flow using the temperature difference

摘要

The measured temperature of a heat transfer fluid in a control circuit(18) is used as a control variable. Additionally the temperature difference between the fluid inlet(24) and outlet(26) of the tool(14) is controled by: a) measuring the fluid temperature in the feed(20) and return(22) lines of the control circuit(18) and b) controling the fluid flow through the circuit by utilizing the difference between feed and return line temperature as a control variable. An independent claim is included for a temperature control system for heating an injection molding tool half(14). Temperature sensors(40,42) are located in the feed line(20) and return(22) line. A flow control valve(44) controls flow in the control circuit(18) using the difference between the measured temperatures in the feed and return lines as a control variable.