Abstract: Method for producing a vessel (2) by blowing in a mould (11) from a preform (3) made of plastic material, comprising the operations consisting in: introducing the preform (3) into the mould; at a predetermined moment, called pre-blowing cue (tP), 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; measuring the pressure (P) inside the preform (3); detecting the so-called real moment (tA), of the beginning of the pre-blowing, at which the (P) in the preform (3) starts to increase; comparing this moment (tA) with a theoretical pre-blowing beginning moment; if the real moment (tA) of the beginning of the pre-blowing follows the theoretical pre-blowing beginning moment, advance the pre-blowing cue (tP); if the real moment (tA) of the beginning of the pre-blowing precedes the theoretical pre-blowing beginning moment, delay the pre-blowing cue (tP).

Abstract: A method for producing a vessel by stretch blow-molding in a mold from a preform made of plastic material includes heating the preform and introducing the preform in the mold. The preform is stretched by a rod displaced at a predetermined stretching speed. At a pre-blowing cue, the electrovalve is opened for establishing a communication between the inside of the preform and a gas source at a predetermined pre-blowing pressure and a pre-blowing flow rate. Pressure inside the preform is measured and a pressure peak is detected. The moment at which this pressure peak occurs and the corresponding pressure inside the preform is stored and compared with a predetermined moment and pressure for a theoretical pressure peak. Depending on the result, at least one of the following are modified: pre-blowing pressure, pre-blowing flow rate, pre-blowing cue, stretching speed, and heating temperature.

Abstract: A method for producing a vessel (2), involving: placing a preform (3) into the mold; at the pre-blowing cue (tp), controlling the opening of an electrovalve (22) for establishing communication between the preform (3) and a source (20) of gas at a predetermined pre-blowing pressure (Pp); measuring the pressure (P) inside the preform (3); at the blowing cue (tS), controlling the opening of an electrovalve (26) for establishing a communication between the preform (3) and a source (24) of a gas at a blowing pressure (PS) higher than the pre-blowing pressure (Pp); memorising the variations of the pressure (P) inside the preform (3) at least during the interval between the pre-blowing cue (tp) and the blowing cue (tS); detecting the expansion end moment (tC) from which the pressure in the preform (3) increases in a linear manner; and advancing the blowing cue (tS) according to the expansion end moment (tC).

Abstract: Method for producing a vessel (1) by stretch blow-moulding in a mould (11) from a preform (3) made of plastic material, comprising the operations consisting in heating the preform (3) to a predetermined heating temperature (T); introducing the preform (3) in the mould (11); stretching the preform (3) by means of a rod (16) displaced at a predetermined stretching speed (VE); at a predetermined moment, called pre-blowing cue (tP), 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 (PP) and a pre-blowing flow rate (DP); measuring the pressure (P) inside the preform (3); detecting a pressure peak; memorising the moment (tB) at which this pressure peak occurs as well as the corresponding pressure (PB) inside the preform (3); comparing the moment (tB) and the pressure (PB) of the peak detected with, respectively, a predetermined moment and pressure for a theoretical pressure peak; if

Abstract: The invention relates to a method for producing a vessel (2) by blowing in a mould (11) from a preform (3) made of a plastic material, comprising the following steps: placing the preform (3) into the mould; at a predetermined moment, called pre-blowing cue (tP), 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 (PP); measuring the pressure (P) inside the preform (3); at a predetermined moment, called blowing cue (tS) and following the pre-blowing cue (tP), controlling the opening of an electrovalve (26) for establishing a communication between the inside of the preform (3) and a source (24) of gas at a predetermined blowing pressure (PS) higher than the pre-blowing pressure (PP); memorising the variations of the pressure (P) inside the preform (3) at least during the interval between the pre-blowing cue (tP) and the blowing cue (tS); detecting in said interval a so-called expan

Abstract: Method for producing a vessel (2) by blowing in a mould (11) from a preform (3) made of plastic material, comprising the operations consisting in: introducing the preform (3) into the mould; at a predetermined moment, called pre-blowing cue (tP), 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; measuring the pressure (P) inside the preform (3); detecting the so-called real moment (tA), of the beginning of the pre-blowing, at which the (P) in the preform (3) starts to increase; comparing this moment (tA) with a theoretical pre-blowing beginning moment; if the real moment (tA) of the beginning of the pre-blowing follows the theoretical pre-blowing beginning moment, advance the pre-blowing cue (tP); if the real moment (tA) of the beginning of the pre-blowing precedes the theoretical pre-blowing beginning moment, delay the pre-blowing cue (tP).