B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
220/17
B65D 33/24 (2006.01)
Patent
CA 1240296
PLASTIC BAGS WITH RELEASABLE CLOSURE AND THEIR MANUFACTURE Abstract A flexible bag has a releasable closure with a fin extending away from one of the mating pluralities of hook-like protrusions. The fin is joined to the base of the hook-like protrusions to apply disengaging force for opening the closure from the outside of the bag. The closure resists opening force from inside the bag. The protrusions have hook-like ends which have the same shape on all protrusions, which extend in one direction on one of the plurality of protrusions and in the other direction on the other plurality of protrusions. The protrusions are easily extruded from molten thermoplastic and applied to a moving web of film during an in-line bag manufacturing process where the temperature of the moving web is maintained such that the profile adheres to the moving web upon contact and thereafter cools to set the thermoplastic in the desired profile. The moving web of film is maintained under tension so that contraction of the film upon release compensates for the contraction of the locking profile as it cools to prevent puckering of the web. The locking profile is applied to the web in an in-line process which includes folding and heat-sealing the moving web of film to form plastic bags.
438723
Gowling Lafleur Henderson Llp
Tenneco Packaging Inc.
LandOfFree
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