| abstract |
A multi-wall bag of tubular form comprising a plurality of plies of flexible sheet material laminated to one another and an innermost ply of heat sealable plastic material loosely bonded to the contiguous ply for manual detachment therefrom, said bag having a pair of oppositely disposed gussets interposed between oppositely disposed surface portions, said plastic and contiguous plies being substantially flush cut at the opposite bag ends, at least the outermost of the remaining plies being stepped in both directions from said plastic and contiguous plies at the bag ends to provide overlap portions with respect thereto, said overlap portions being coated with a thermoplastic adhesive, said plastic ply being heat sealed transversely of said tube at one bag end, and the overlap portion at said end being folded over and adhesively bonded to the opposite bag surface. |