Method and apparatus to regulate heating of a hot runner in a multicavity mould

In order to achieve a simultaneous filling of all cavities (K1-K4) in multi-cavity injection molds, the curves of the cavity pressure (p) are recorded in all cavities (K1-K4) and the times (tl-t4) from the beginning of the filling process to reach a suitably selected reference pressure (pR) for each cavity (K1-K4) measured. By intervening in the individual heaters of the individual hot runners (5), the temperatures in these channels are changed so that the measured times of the individual cavities approach each other.