Method and apparatus for blow moulding of containers with a movable base part

An apparatus for transforming plastic parisons into plastic bottles, the apparatus comprising:

• at least one transport device on which a plurality of transforming stations are arranged, wherein each of the transforming stations has blow moulds which in each case have two lateral parts, which are movable with respect to one another for opening and closing the blow mould;
• a base part, wherein the base part is movable relative to the lateral parts in a longitudinal direction (L) of the plastic parison and in a closed state of the blow mould;
• at least one application device configured to apply a gaseous medium to the plastic parisons for expansion thereof;
• a control device which controls the application of the gaseous medium to the plastic parisons wherein, first of all, a first pressure (P1), then a second pressure (Pi) which is above the first pressure (P1), and finally a third pressure preferably above the second pressure (P2), are applied to the plastic parisons, wherein the apparatus has a driving device configured to move the base part at least intermittently during the application of pressure to the plastic parisons, wherein the base part is advanced towards the plastic parison in the longitudinal direction (L) of the plastic parison in at least two time intervals spaced apart from one another in time.