Method of improving the mould quality of mould-forming machine

The method of improving the mould quality of a mould-forming machine comprising at least one moulding chamber with oppositely positioned and movable squeeze plates, in which the mould-forming process comprises the steps of a) filling the at least one moulding chamber with compressible mould material, b) pressing the mould material between the squeeze plates, c) opening the moulding chambers(s) by moving at least one of the squeeze plates, d) removing the produced mould or mould parts from the moulding chamber(s) and e) reclosing the moulding chambers(s) by moving at least one of the squeeze plates, ready for a new cycle starting from step (a), by moving at least one squeeze plate in a direction reducing the volume of the moulding chambers(s) during at least part of the filling step a), an improved filling of mould cavities is achieved, which compensates for the reduced filling velocity during start-up of the filling.