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Cooling

Mold cooling

Task

Injection molds for plastics processing must be heated before injection molding. The molds must be cooled after molding to facilitate hardening and part ejection.

Solution

The temperatures of the each of the two halves of the injection mold are controlled independently. The molds are heated electrically by means of cartridge heaters incorporated in the mold. Cooling water is pumped through the two mold halves in order to cool the molds. The temperatures are measured with resistance thermometers. These actual temperature values are supplied to the temperature controllers, which, depending on the pre-settings, activate either the solenoid-operated control or proportional valves incorporated in the cooling water circuits. The controllers are mounted directly on the proportional valves. The set-point presetting is performed locally using the buttons of the controllers, or the set-point value is preset externally via a standard signal.