If there is a hot runner system implemented in the mold a PID-Controller is used to bring the heater band up to a given temperature.
By controlling the heater band, the temperature at the sensor oscillates around the requested temperature.
Dependent on the choice of P-,I- and D-values reaching the given temperature happens faster or slower.

PID-Controller in Plastic Industry

Hot Runner: The curve of the PID-Controller shows the oscillation of the temperature over time.

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This glossary of plastic industry is provided by PLEXPERT Canada Inc.