Patent ID: 8460599

Claim:
A method for the economical production of containers out of thermoplastic material, comprising the following steps: feeding a respective preform to a respective mould carrier of a blow moulding machine which has at least one pressure compartment of low pressure and at least one pressure compartment of high pressure; supplying pressurized air from a central air distributor to the at least one pressure compartment of low pressure and the at least on pressure compartment of high pressure, wherein the pressure in the pressure compartment of low pressure is lower than or equal to the pressure wherein the pressure compartment of high pressure; applying at least one first pressure to the respective preform in the mould carrier for pre-blowing the containers; carrying out a final blowing of the containers with at least one second pressure, which is supplied by the pressure compartment of high pressure and is higher than the first pressure; guiding at least one part of a venting of the final blown containers into a pressure compartment of low pressure, wherein the pre-blowing and/or further blowing steps for the production of the containers proceed from the pressure compartment of low pressure; and maintaining an essentially constant pressure in the pressure compartment of low pressure with a control unit during the pre-blowing and/or further blowing steps and the venting and controlling a lowering or raising of a pressure level of an external unit in such a way that a desired curve of the pressure rise or drop is achieved as a function of time and wherein a volume flow rate of the blowing medium is controlled by adjusting the set pressure of the external unit.