Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1984-03-16
1985-11-05
Coan, James F.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493194, 493346, 493933, B31B 110, B31B 3902
Patent
active
045511250
ABSTRACT:
A plurality of multi-walled bags of flexible plastic material is formed by taking a longitudinally folded flat web of a first flexible plastic film; at least partially separating the superposed plies of said first flexible plastic film at the edge opposite the fold line and moving the film past a corona discharge electrode between the separated plies of the film to pre-treat at least a part of the inwardly facing surface of each of said two plies; taking a longitudinally folded flat web of a second flexible plastic film; corona discharge-treating the outwardly facing surfaces of the two plies of said second flexible plastic film; passing the pre-treated web of said second flexible plastic film over a diverter guide into the space between the two at least partially separated plies of said first flexible plastic film to bring the fold lines of the first and second flexible plastic film webs substantially into register with the two webs moving synchronously in a single direction; and sealing the composite of the two folded webs at a sealing station, along spaced transverse seal lines to form a plurality of open-ended bags having the bottom of each bag defined by the registered fold lines of the two webs and the mouth region of the bag defined at the web margin opposite the said fold line. The bags may be either wound up in a roll without severing or severed from one another and then stacked or attached to feed tapes in a imbricated way.
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Pezzana Francesco
Quacquarella Cesare
Coan James F.
Lee, Jr. William D.
Quatt Mark B.
Toney John J.
W. R. Grace & Co., Cryovac Div.
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