Gusseted pinch bottom valved bags
AssigneeWestvaco Corporation
InventorsGeorge L. Willet, William D. Mushet
Life of this patent
Estimating the term…
Abstract
An improved multiwall, gusseted, stepped end pinch style bag is disclosed with provisions for forming a valve in one end thereof. The bag is prepared from a plurality of plies of flexible material such as kraft paper or the like and comprises at least one inner ply and one outer ply each of which is cut and scored to permit a valve area to be formed at one end when the gussets in that region are infolded while still retaining the conventional pinch style closure.
Claims14
A gusseted, valved multiwall pinch style bag having a tubed body formed from a plurality of plies of flexible sheet material, said plies comprising at least one inner ply and at least one outer ply each comprising a front wall, a pair of first gusset panels foldably connected to said front wall along a first pair of fold lines, a pair of second gusset panels foldably connected to said first gusset panels along a second pair of longitudinal fold lines and a rear wall foldably connected to said second gusset panels along a third pair of longitudinal fold lines, the terminal edges of the plies at each end of the tubed body being stepped with respect to one another to provide stepped end closures, the improvement comprising means associated with said bag for forming a valve in one end thereof characterized by:
- a. at least one cut line in an outer ply of said tubed body located along a fold line between one of the walls of said bag and a gusset panel of said bag at one side of said tubed body;
- and,
- b. a uniformly applied spot adhesive application between said inner and outer plies except in the region adjacent to said cut line.
A gusseted, valved multiwall pinch style bag having a tubed body formed from a plurality of plies of flexible sheet material, said plies comprising at least one inner ply and at least one outer ply that are adhered to one another substantially throughout their entire width along the free edges thereof, each ply comprising a front wall, a pair of first gusset panels foldably connected to said front wall along a first pair of longitudinal fold lines, a pair of second gusset panels foldably connected to said first gusset panels along a second pair of longitudinal fold lines and a rear wall foldably connected to said second gusset panels along a third pair of longitudinal fold lines, the terminal edges of the plies at each end of the tubed body being stepped with respect to one another to provide stepped end closures, the improvement comprising means associated with said bag for forming a valve in one end thereof characterized by:
- a. at least one cut line in an outer ply of said tubed body along a fold line between one of the walls of said bag and a gusset panel of said bag at one side of said bag;
- and,
- b. the absence of adhesive between said inner and outer plies in the region adjacent to said cut line which permits the gusset panels of both the inner and outer plies to be infolded to form a valve opening in said tubed body while leaving a flap portion of said outer ply available for closing the valved end of said bag.
Dependencies are inferred from the claim text.