Device and method for liquid-tight sealing of two partially overlapping packaging parts and containers Produced therewith/thereby

A device for liquid-tight sealing of two partially overlapping packaging components, wherein one of the packaging components is a tubular basic body, formed from a blank made of cardboard and plastic composite material, and wherein a second packaging component forms a packaging head or bottom, the device comprising:

• a mandrel and a die, wherein the mandrel has at least two expansion elements, wherein the at least two expansion elements in a working position have an expanded cross section, and wherein the at least two expansion elements are movable towards each other from the working position to a rest position having a reduced cross section, in order to allow the tubular basic body to be slid on the mandrel,
• wherein the at least two expansion elements have sealing jaws which, when the at least two expansion elements are in the working position, form a closed, encircling outer contour, which corresponds to an inner contour formed by an opening in the die, and wherein between the inner contour and outer contour, a narrow annular gap remains for application of a pressing force from an inside onto an overlapping area of the two partially overlapping packaging components,
• wherein the at least two expansion elements are each individually arranged on a joint base element to be individually swiveling,
• wherein the at least two expansion elements are, at least in an area of the sealing jaws, formed as magnet armatures, and
• wherein the die has one or more magnetic coils that are adapted to activate the magnet armatures to radially expand the at least two expansion elements.