Patent ID: 9278496
Filing Date: 2016-03-08
CPC Classification: B31B,B65D

Claim Text:
1. A method of manufacturing a foldable bag for use in a bag-in-box assembly, the foldable bag having a folded condition in which it includes at least an inwardly creased bag portion in a longitudinal direction thereof, the method comprising: providing a flexible bag comprising a front sheet and a back sheet wherein each sheet includes an inner surface and an outer surface, a left side edge, a right side edge, a top side edge and a bottom side edge wherein each corresponding edge of the inner surface of the front sheet and is joined together to the inner surface of the back sheet about each of the left side edge, the right side edge, the top side edge and the bottom side edge thereof to define a sealed cavity, which bag has an unfolded condition in which it includes at least either the right side edge or the left edge and substantially the entire portion of the inner surface of the front sheet within the cavity abuttingly overlying substantially the entire portion of inner surface of the back sheet within the sealed cavity, displacing the front sheet and the back sheet away from each other in at least a region of displacement extending on each of the sheets remote from the left and right side edge, hence creating a space between the front and back sheet in at least said region of displacement, displacing either the left side edge or the right side edge in the direction of said space, with the top side edge sliding inwardly over itself forming a top flow-through opening therebetween and the bottom edge sliding inwardly over itself so as to have a portion of the inner surface of the front sheet within the cavity abuttingly overlying itself, and so as to have a portion of the inner surface of the back sheet within the cavity abuttingly overlying itself, and defining a bottom flow-through opening therebetween so as to form two double-walled flaps, each extending substantially perpendicularly to the left or right side edge, thus forming an inwardly creased bag portion in the longitudinal direction of the bag returnable to the unfolded condition; and moving the flaps to each other when the left or right side edge has reached a predetermined position between the front and back sheet of the bag wherein the bag is structurally configured to entirely unfold into the unfolded condition when filled with a liquid.