When an injection stretch blow molding machine in which the molding cycle is tried to be shortened manufactures hollow molded bodies, blow molding in which shaping and cooling are simultaneously performed by blowing compressed air from a single compressed air supply source while discharging compressed air is performed to achieve energy saving for manufacturing hollow molded bodies.

A blowing apparatus 10 of a stretch blow molding apparatus 11 includes a compressed air supply source 32 configured to send out compressed air adjusted to have an air pressure at which an object to be shaped e is inflated to be shaped into a hollow molded body, an inflow passage 33 through which the compressed air from the compressed air supply source 32 flows to the internal space of the object to be shaped e disposed in a blow mold 8, and a non-closed outflow passage 34 through which the compressed air flows out from the internal space of the object to be shaped e to a discharging space outside the blow mold. In the entire process of the blowing operation by the blowing apparatus 10, a compressed air flow passage 36 is formed through which the compressed air from the compressed air supply source 32 flows through the inflow passage 33 and the internal space of the object to be shaped e and through the outflow passage 34 into the discharging space. Shaping and cooling are simultaneously performed by blowing the compressed air adjusted to have an air pressure at which the object to be shaped e being in the form of a preform is inflated to be shaped into the hollow molded body throughout the entire process of the blowing operation.

Plastic preforms are introduced into a blow mold and are expanded by applying a flowable medium thereto, which is introduced into the internal space of the plastic preforms, wherein the blow mold includes at least two lateral parts which form a cavity during the expansion of the plastic preforms, within which the plastic containers are expanded. The lateral parts are respectively provided on lateral part carriers that are moved relative to each other for opening and closing the blow mold. At least one arrangement of a lateral part carrier and the lateral part provided thereon has an expansion element that can have a gaseous medium applied thereto. The expansion element ensures, when the gaseous medium is applied thereto, that one lateral part is moved towards the other lateral part. During the expansion of the plastic preforms, at least two different pressure levels are applied.

An apparatus for the shaping of plastics material pre-forms into plastics material containers, with a plurality of shaping stations which are arranged on a movable carrier, wherein the shaping stations have blow molds which are used for receiving the plastic pre-forms and inside which the plastic pre-forms are shaped into the plastic containers, and wherein the shaping stations have stressing devices which are movable relative to the plastic pre-forms and which act upon the pre-forms arranged in the blow molds with a sterile flowable medium to expand them, with a clean room, inside which the shaping stations are conveyed, wherein this clean room is arranged or demarcated from the environment by means of at least one wall. At least one supply device is provided for supplying a flowable control medium to at least one shaping station), wherein this supply device (60) is sealed off from the clean room.