a plastic preforms molding device and process comprising an injection mold , containing a plurality of injection cavities , an arm for extracting the preforms from the mold , equipped with guillotine - like gripping elements , which moves between the existing space between the half molds when in the open position in order to grasp the preforms and the external position , a cooling turret , with the faces housing a group of cups for the conditioning of the preforms , which effects a rotational movement around a horizontal axis and a vertical translation movement between the high position under the extraction arm to receive the preforms and the low position corresponding to the extraction table of the preforms , on which are indented longitudinal slots with teeth shaped constrictions in order to grasp the preforms under the ring and to extract them from the cups .