METHOD AND MACHINE FOR THE CONTINUOUS MANUFACTURE OF PACKAGES MADE FROM FLEXIBLE MATERIAL AND RESULTING PACKAGE
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Abstract
The invention relates to a method for continuously manufacturing containers made of a flexible material from a single continuous laminar band, or from several continuous laminar bands which will be longitudinally attached to form a single continuous laminar band, which will subsequently be transversely cut. In both cases, in a stage of the production phase a single laminar band, folded over itself along longitudinal fold lines, is obtained, the cross-section of which, open or closed according to the embodiment variant, forms a planar figure in which there is distinguished the upper base of the container, which in a variant of the method comprises a portion of band previously provided with holes and corresponding spouts, collapsed on one side, said single laminar band being susceptible of being driven by means of two drive rollers.
14 Citations
35 Claims
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1-20. -20. (canceled)
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21. 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. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
- 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
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33. A container formed by one sheet made of a flexible and heat-weldable material on one of the faces thereof, comprising
an upper base with a general parallelepiped shape with its edges being bevelled and without any fold line traversing it transversely or longitudinally, provided with a spout through which the content of the container can be poured to the exterior, and two side walls with their upper edges bevelled in correspondence with the bevels of the mentioned upper base, each bevel of the upper base being attached by heat welding to the bevelled edge of a corresponding side wall, a pair of inclined weld beads being formed on each side of the container, which determine respective transition shoulders between the central portion of the upper base and the sides of the container, the inclined weld beads of one and the same pair converging in a corresponding vertical weld bead of attachment between the facing edges of the two side walls of the container, which extends to the bottom, or lower base, of the mentioned container, and in that the sheet portions forming the upper base and the side walls of the container are contiguous portions of the sheet joined without interruption.
Specification