Patent ID: 8790229

Claim:
A method for continuously manufacturing containers made of a flexible material, from a single continuous laminar band made of plastic material heat-weldable on one of the faces thereof, the container being of the type in which there are distinguished, in the normal open position, two facing side walls and at least one upper base, wherein in a production phase, the single initial continuous laminar band is folded over itself along longitudinal fold lines according to a first and a second double zigzag folds and further folded over itself towards its heat-weldable face according to a third 180° fold until its cross-section forms a planar figure comprising the first side wall, along one of the edges of which the upper base of the container is collapsed; and the second side wall, the upper end portion of which is folded over itself downwardly and abuts the back of the collapsed upper base of the container, before the mentioned single continuous laminar band is transversely cut.