B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
220/12, 226/75
B65D 33/18 (2006.01) B65B 7/12 (2006.01) B65B 51/00 (2006.01) B65B 51/08 (2006.01)
Patent
CA 1122576
Abstract of the Disclosure To provide a hermetic seal for flexible receptacles such as plastic bags, pouches, or casings, the outside of the mouth of the receptacle is coated with a cold flowing resin so that when the receptacle is filled and its mouth gathered under pressure the resin will cold flow and fill the voids in the gathered folds. Preferably, the end of the gathered mouth is trimmed and then high pressure is applied to cause the resin to exude from the trimmed end. Next, a forming plunger is used to press the exudate into a smooth surface whereby a fused cap of resin is formed hermetically closing the bag's mouth. As an alternative, a clip or band can be placed around the gathered end under sufficient pressure to cause cold flow of the resin thereby sealing the voids.
317360
Smart & Biggar
W.r. Grace & Co.,-Conn.
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