Patent ID: 7998396
Filing Date: 2011-08-16
Classification: B29C,B29K

Abstract:
1. Blow moulding or stretch-blow moulding method for manufacturing containers from blanks with a neck made of thermoplastic material comprising PET, by a blow moulding or stretch-blow moulding device comprising a blowing nozzle for blowing a fluid under pressure inside a blank having a body arranged in a moulding cavity of a mould and having a neck protruding from a surface of said mould, a flange of said neck resting on said surface of the mould, the blowing nozzle being mobile between two limit positions, comprising a high position raised above the mould and a low blow moulding position in which the blowing nozzle is operatively in tight connection with the neck so that blow air under pressure is injected into the blank, the method comprising at least the following steps: a step of gripping the neck of a non-blow moulded heated blank by clamping means provided above the mould; a step of lowering the blowing nozzle from the high position; a step of placing the body of the non-blow moulded heated blank in the moulding cavity by said clamping means; a step of opening the clamping means once the body of the non-blow moulded heated blank is placed in the moulding cavity; said gripping and placing steps being synchronized with the movement of the blowing nozzle; a step of blow moulding the blank using the blowing nozzle once the blowing nozzle has reached the low blow moulding position; a step of lifting the blowing nozzle back to the high position; a step of closing the clamping means once the blank is blow moulded, the body of the blow moulded blank remaining in the moulding cavity; a step of displacing the blow moulded blank out of the moulding cavity by said clamping means, said displacing step being synchronized with the movement of the blowing nozzle; and a step of transferring of the blow moulded blank from the clamping means to external means for gripping blow moulded blanks.