a method of shaping plastics material pre - forms into plastics material containers with the steps : introducing a plastics material pre - form into a blow mold ; conveying the blow mold with the plastics material pre - form along a pre - set conveying path ; acting upon the plastics material pre - form with a gaseous medium during a pre - set period of time for the expansion thereof , wherein the supply of the gaseous medium is carried out in a controlled manner ; and releasing the container from pressure at a pre - set point in time . according to the invention the pre - set point in time is variable .