| 摘要 |
<p>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 expansion end moment (tc) from which the pressure in the preform (3) increases in a linear manner; advancing the blowing cue (ts) according to the expansion end moment (tc).</p> |
