Abstract: A chain of bags is disclosed, with each having first and second panels and gusseted sides, each established by first and second gusset panels. The chain of bags is provided with a transverse bottom seal which in the central portion seals together the front and rear panels, and also seals together the inner portion of the gusset panels as well as the front and rear panels for four thicknesses being sealed. At the outer portions, there are only two thicknesses sealed together, namely, the front gusset panels are sealed to the front panel and the rear gusset panels are sealed to the rear panel. This establishes a chain of bags which may be supplied to a bag filling machine whereat conveyor belts form a nip and grip only the outer portion of the rear gusset panels where attached to the rear panel. By this means, the bags of a chain may readily be opened to practically full capacity and then filled.

Abstract: A chain of bags is disclosed, with each having first and second panels and gusseted sides. The chain of bags is provided with a transverse bottom seal which in the central portion seals together the front and rear panels, and also seals together the inner portion of the gussets as well as the front and rear panels for four thicknesses being sealed. At the outer portions, there are only two thicknesses sealed together, namely, the front gussets are sealed to the front panel and the rear gussets are sealed to the rear panel. This establishes a chain of bags which may be supplied to a bag filling machine whereat conveyor belts form a nip and grip only the outer portion of the rear gussets where attached to the rear panel. By this means, the bags of a chain may readily be opened to practically full capacity and then filled. When the bag is closed and sealed, it forms a rectangular bag with square ends which may readily be palletized to form a secure and stable pallet load.

Abstract: Square ended valve bags are formed from a tube-like band and in a chain with the back wall and top end of each bag partially sealed together to provide bags between the seals. Patches are placed on the top end of the bag and the patches and top ends are provided with displaced openings to provide a valve. Each bag in turn may be filled through the valve located in the top end, the bag expanding forwardly from the back wall by expanding gussets in the top and bottom ends.

Abstract: A continuous strip covering the open mouth end of bags connects successive bags in a chain of bags. The strip is activatable relative to the bags to constitute adhesive for sealing the bags when they are filled and closed.

Abstract: Open mouth square ended bags are formed from a tube-like band and in a chain with the back wall and top end of each bag partially sealed together from each side wall to provide an open mouth therebetween. Each bag in turn may be filled through the mouth located between the back wall and top end, the bag expanding forwardly from the back wall by expanding gussets in the top and bottom ends.

Abstract: A valve bag and an interconnected series of valve bags is disclosed which have alignment means on the bag. This is shown as a continuous tunnel along a first edge of the interconnected bags for guidance into an automatic bag filling machine, for example, onto a mandrel threading the tunnel. Each bag has a valve formed by overlapping portions of panels of one wall of a bag. Parts of the overlapping portions are sealed together and other parts are left open between two valve side edge lines to form a valve from the overlapping material.

Abstract: A valve bag and a series of interconnected valve bags is disclosed wherein the bag is constructed from first and second walls, with one wall having first and second overlapping panels. The valve is formed between unsealed portions of the overlapping panels, and other areas of the overlapping portions are sealed together. A tunnel is provided along a first edge of the series of bags so that the series may be guided into a bag filling machine. This tunnel is to be threaded by a mandrel to align the series of bags in the bag filling machine. As constructed, the valves in the bags are sealed closed, and only at the filling machine is the tunnel slit open by a cutter to expose the exterior opening of the valve so that the bag may be filled through this valve.

Abstract: Open mouth square ended bags are formed from a tube-like band and in a chain with the back wall and top end of each bag partially sealed together from each side wall to provide an open mouth therebetween. Each bag in turn may be filled through the mouth located between the back wall and top end, the bag expanding forwardly from the back wall by expanding gussets in the top and bottom ends.