Process and device for the manufacture of a particularly heat-resistant hollow body

A process for manufacturing a hollow body which is molded from a heated preform of thermoplastic material in a contoured blow mold, comprising stretching a preform by moving a hollow stretching rod through an opening of the preform and into a direction of its base, placing a blowing nozzle on the hollow body and connecting the blowing nozzle with a valve block comprising a preblowing valve, a final blowing valve, and further comprising subsequent steps of:

• opening the preblowing valve and conducting preblowing air through the preblowing valve into the hollow body;
• closing the preblowing valve, opening the final blowing valve and conducting final blowing medium through the opened final blowing valve into the hollow body;
• and
• closing the final blowing valve and cooling the hollow body by feeding a cooling medium through the hollow stretching rod, the hollow stretching rod having an open bottom directed downwardly and cooling the hollow body comprising cooling the base of the hollow body in a completely targeted manner by the cooling medium fed through the open bottom, and removing the cooling medium from the hollow body by means of the blowing nozzle thereby enabling circulation of the cooling medium during the cooling process, whereby the hollow body is blown in one of a plurality of blow molding stations which rotate on blow molding wheel and whereby process air is fed through ring channels to the one of plurality of blow molding stations.