Sidel Participations

Isabelle Monin

Thierry Deau

Method for producing a vessel () by blowing in a mould () from a preform () made of plastic material, comprising the operations consisting in:

Method for producing vessels with feedback depending on the pre-blowing starting point

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.

Method for producing a vessel from a preform, with feedback depending on the development point of the preform

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

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Octeville sur Mer, France

Isabelle Monin