A LENGTH OF FLATTENED TUBING FOR FORMING A FLEXIBLE TANK, A METHOD OF FABRICATING A FLEXIBLE TANK AND A FLEXIBLE TANK FABRICATED THEREWITH

摘要

A method of fabricating a flexible tank is disclosed which method comprises cutting away the corners of the upper layer (12) of a flattened flexible tube (10) and cutting away the corners of the lower layer (14) of the flattened flexible tube to provide, at each corner of each layer, a rectangular cut out bounded by first and second intersecting edges (24, 26 / 30, 32) with flaps (20, 22) between the cutouts. One of the flaps (20) of the upper layer (12) is welded to the underlying flap (22) of the lower layer along a transverse weld line (36). The upper flap and the weld line are then pulled in the direction which causes each flap (20, 22) to fold transversly whereby the upper flap (20) overlies both itself and the end part of the upper layer (12) and the lower flap (22) overlies both itself and the end part of the lower layer. Those parts of the layers which now lie outwardly of the end edges of the flaps are folded over on themselves along diagonal lines so that end zones thereof overlap end zones of the flaps (20, 22). The overlapping zones are welded together to close one end of the tank. The procedure is repeated to close the other end of the tank.