Patent ID: 7892477

Claim:
Process for the manufacture of a hollow body ( 7 ) which is molded from a heated preform of thermoplastic plastic in a contoured blow mold ( 2 a ) comprising: i) Stretching the hollow body ( 7 ) and introducing a first medium into the preform, which first medium is stored in a first medium storage unit ( 32 ) and is under a first pressure (pl); ii) Final blowing by introducing a second medium into the hollow body ( 7 ), which second medium is stored in a second medium storage unit ( 31 ) and is under a second pressure (p 2 ) which is higher than the first pressure (p 1 ); iii) Cooling the hollow body ( 7 ) from the inside by admitting a third medium, which third medium is stored in a third medium storage unit ( 33 ) and is under a third pressure which (p 3 ) is higher than the second pressure (p 2 ) and molding out the hollow body ( 7 ) that results from the pressure difference; iv) Producing a connection between the third medium storage unit ( 33 ) and one of the first and second medium storage units through the hollow body ( 7 ) and internally cooling the hollow body that results from the same ( 7 ); and v) Separating the connection and releasing at least one of the first, second and third medium from the hollow body ( 7 ), so that ambient pressure prevails in the hollow body ( 7 ).