To process plastic, an injection mold must be brought to a certain temperature.
The thermal energy introduced by the melt must be dissipated to ensure that the temperature in the mold is as uniform as possible.
These tasks are performed by the temperature control system installed in the mold.
This is usually formed by bores, some of which are provided with plugs to guide the coolant (usually water).
The tightness of the individual channels in the cooling system is ideally carried out before the mold is set up.
For this purpose, water is pumped into a circuit via a pump and kept under pressure for a certain time.
If water does not leak at any point, the leak test of the sewer is complete and the next sewer can be tested.