Bulk bag lifting loop attachment system

Abstract

An improved bulkbag and method of making same, of the type having four sidewalls, a floor and top portion, all portions stitched together to define the enclosure for the bulk bag housing material. The bag comprises a plurality of four wall panels, which each panel having a first and second vertical edge for sewing into the next adjacent panel along each edge. Prior to sewing the panels together, to each upper edge of each panel there is provided a first and second leg of a lifting loop, so that each loop spans from the first edge to the second edge of each panel. The panels are then sewn together along their edges, and there is defined the bulk bag, with the ends of each of the four lifting loops terminating at the stitch line between panels, which define the middle of each sidewall of the bag. There would then be provided a reinforcement ring at each point where a pair of legs of lifting loops are stitched to strengthen the attachment point. Further there would be provided at each lifting loop attachment points a dart, or stacker seam to define the bottleneck feature of the bag. The lifting loop attachment points would define a vertical seam along the surface of the dart defined by the stacker seam. Further there is provided a back tack stitching feature to prevent spread forces in the filled bag, and reinforcing strapping in the loops to provide a stiffening feature to the loops.