B - Operations – Transporting – 31 – B
Patent
B - Operations, Transporting
31
B
93/39, 93/9
B31B 1/64 (2006.01)
Patent
CA 1311956
F-4523 PROCESS FOR MAKING SINGLE SIDE FREE PLASTIC BAG ABSTRACT The present invention is a method of continuously making thermoplastic film bags having one-side-free for separation from an opposite side. The method includes providing a continuous tube of thermoplastic film for formation of the bag, such tube having a continuous surface which forms opposing sides of said bags. The tube is directed to a bag forming means which continuously flattens the tube into at least the opposing sides of the bag. The tube must intermittently be partially severed on one of the opposing sides at intervals corresponding to single bag lengths, such severance being made at a location for providing detachable separation of the one wall from the opposing wall. Next a sealed seam is formed across the tube at intervals which provide bottoms to each of the bags, and the bags are then collected in a stack where they are substantially aligned followed by fusing the stack of substantially aligned bags adjacent the severance in the one side for separating the bags from the stack one side at a time.
607811
Benoit Gordon L.
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
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