Patent ID: 8532814

Claim:
Method for producing a vessel ( 2 ) by blow-moulding in a mould ( 11 ) from a preform ( 3 ) made of plastic material, comprising the following steps: introducing the preform ( 3 ) into the mould ( 11 ); at a predetermined moment, called pre-blowing cue (t P ), controlling the opening of an electrovalve ( 22 ) for establishing a communication between the inside of the preform ( 3 ) and a source ( 20 ) of gas at a predetermined pre-blowing pressure (P P ); measuring the pressure (P) inside the preform ( 3 ); at a predetermined moment, called blowing cue (t S ), following the pre-blowing cue (t P ), controlling the opening of an electrovalve ( 26 ) for establishing a communication between the inside of the preform ( 3 ) with a source ( 24 ) of gas at a blowing pressure (P S ) that is greater than the pre-blowing pressure (P P ); memorizing the variations in the pressure (P) inside the preform ( 3 ) at least in the interval between the pre-blowing cue (t P ) and the blowing cue (t S ); detecting in this interval the expansion end moment (t C ), from which the pressure (P) in the preform ( 3 ) increases in a linear manner; advancing the blowing cue (t S ) according to the moment of expansion end (t C ).