Device and method for manufacturing a hollow glass article by controlled blowing

A method for forming a glass article starting with a blank intended to become the glass article, the method comprising the steps of:

• providing a forming device for forming the glass article, the forming device including
• a forming mold for receiving the glass blank, the glass blank defining an inside cavity and having a mouth with a main axis,
• a gas injection device with a blowing head configured for propelling gas into the inside cavity, and configured to be received in the mouth of the blank, the gas injection device comprising an air circuit,
• the air circuit comprising
• a pressurized gas inlet,
• an injection channel connecting the pressurized gas inlet to at least one outlet nozzle to be placed inside the inside cavity, through a first control valve, and
• a vent channel connecting the inside cavity to an atmospheric outlet, and the blowing head comprising a pair of upstream sensors, the pair of upstream sensors comprising an upstream pressure sensor (P1) and an upstream temperature sensor (T1), both said upstream sensor (P1) and said upstream temperature sensor (T1) arranged on the injection channel inside the blowing head, and
• an electro-pneumatic control unit;
• injecting into the inside cavity of the blank, via the first control valve, pressurized gas via the injection channel connecting the pressurized gas inlet to the at least one outlet nozzle in the inside cavity of the blank;
• simultaneously measuring a first pressure and a first temperature on the air circuit between the first control valve and the outlet to outside air, by way of the upstream pressure sensor (P1) and the upstream temperature sensor (T1);
• and
• controlling, via the electro-pneumatic control unit, the first control valve according to pressure measurements read by the upstream pressure sensor (P1) and temperature measurements read by the upstream temperature sensor (T1), so that the first control valve is controlled according to aeraulic conditions of a flow of the gas injected into the inside cavity and predetermined aeraulic criteria.

A device for forming a glass article, comprising:

• a forming mold for receiving a glass blank defining a blank cavity therein and having a mouth having a main axis, said glass blank intended to become the glass article;
• a gas injection device with a blowing head configured for propelling gas into the blank cavity, and configured to be received in the mouth of the blank, the gas injection device comprising an air circuit,
• the air circuit comprising
• a pressurized gas inlet,
• an injection channel connecting the pressurized gas inlet to at least one outlet nozzle to be placed inside the blank cavity, through a first control valve, and
• a vent channel connecting the blank cavity to an atmospheric outlet,
• and the blowing head comprising a pair of downstream sensors, the pair of downstream sensors comprising a downstream pressure sensor (P2) and a downstream temperature sensor (T2), both said downstream pressure sensor (P2) and said downstream temperature sensor (T2) arranged on the vent channel inside the blowing head;
• and
• an electro-pneumatic control unit configured to control the first control valve according to pressure measurements read by the downstream pressure sensor (P2) and temperature measurements read by the downstream temperature sensor (T2), so that the device controls the first control valve according to aeraulic conditions of a flow of gas blown into the blank cavity and predetermined aeraulic criteria.