Method for producing at least one flexible plastic container

A method for the manufacture of at least one flexible plastic container, each container comprising two separate walls facing one another joined at least on a section of their circumference by a sealed peripheral edge, said separate walls defining a storage space of the container, wherein at least the following stages are realized:

• a) forming a pile of two sheets of plastic material, said sheets being laid one against the other, the surfaces which face one another of these sheets being placed directly in contact with one another without any element acting as an interface,
• b) simultaneously shaping said sheets thus laid one against the other in order to define said at least one container without having previously separated these sheets, where simultaneously shaping said sheets comprises, with at least each container being partially formed, said sheets being maintained lying one against the other in at least one section of the areas of said sheets intended to constitute said peripheral edge of each container during this shaping, said shaping being realized by suction pressure forming by placing said pile between two mold sections which can be spaced at a distance from one another and brought to bear one against the other thus defining one or more cavities, at least one of these cavities thus formed corresponding to the shape and the external dimensions of a container to be manufactured, said at least one cavity then being closed at a section of its periphery corresponding to a section of the peripheral edge of the corresponding container to be formed, at least one of said mold sections comprising several orifices linked to one or more pump units,
• c) sealing at least partially the areas of said sheets intended to constitute said peripheral edge of at least each container.