Container manufacturing method, involves advancing pre-blowing signal if real instant is later to theoretical instant of beginning of pre-blowing, and delaying signal if real instant is prior to theoretical instant

摘要

The method involves introducing a bolt blank in a mold, and controlling opening of a solenoid valve for communicating the blank with a gas source at a pre-set blowing pressure, during a pre-blowing signal (tp). The pressure inside the blank is measured, and a real instant (tA) of starting of preblowing is detected, where the pressure starts to increase. The instant is compared with a theoretical instant of starting of preblowing, and the signal is advanced if the real instant is later to the theoretical instant. The signal is delayed if the real instant is prior to the theoretical instant. Independent claims are also included for the following: (1) a machine for fabricating a container from a bolt blank, comprising a mold (2) a computer program product to be implemented on a container fabricating machine, comprising instructions for controlling opening and closing of solenoid valve.