Method for producing a plastic container

A process for production of a container by blowing starting from a pre-form made of plastics material within a production unit, the production unit comprising a mold defining an impression for the container to be formed, and a nozzle which is designed to close the mold hermetically, the production process comprising:

• a sequence of forming by blowing, with a blowing phase (S2;
• S3;
• S5) comprising at least the injection and maintenance of a gas under pressure in the pre-form, via the nozzle, in order to deform the pre-form until it matches the impression of the mold, and obtain a container;
• a phase of degassing (D2;
• D3;
• D5) of the container formed, consisting of discharging the gas contained in the container at the end of the forming sequence, in order to take the interior of the container to atmospheric pressure,
• wherein, during the degassing phase (D2;
• D3;
• D5), the nozzle is spaced (ET2;
• ET3;
• ET5) from the mold in order to interrupt the hermetic closure, so as to put the interior of the container into direct fluid communication with the atmosphere, the spacing of the nozzle being begun:
• after the beginning of the degassing phase (D2;
• D3), when the pressure in the interior of the container has dropped and has reached an intermediate pressure which is lower than the pressure at the end of the forming sequence, and is between 14 and 3 bars;
• or
• after completion of the blowing phase (S2;
• S3;
• S5), at a predetermined instant which takes place within an interval of time of between 0 and 200 ms after the stoppage of the injection of gas into the container and at a pressure not above approximately 14 bars.