The present invention concerns a system for the further treatment of hollow body preforms produced by injection molding, comprising i) a receiving plate having at least one receiving cavity for receiving a preform, ii) a post-treatment system which has a) a post-treatment plate, b) at least one impression pin provided for changing the internal contour of the profile by either coming into contact with the inside of the preform during the post-treatment or closing the preform and acting on the inside space with a fluid under pressure, whereby the preform is inflated, and c) at least one post-treatment element which is provided for passing into the interior of a preform received in the receiving cavity or coming into contact with the preform, and iii) a movement device with which the receiving plate can be reciprocated relative to the post-treatment plate between a first position in which the impression pin is positioned within the receiving cavity, a second position in which the post-treatment element is positioned within the receiving cavity or comes into contact with a preform received therein, and a third position in which neither the impression pin nor the post-treatment element is positioned within the receiving cavity or comes into contact with a preform received therein.