B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
B65D 33/34 (2006.01) B31B 19/90 (2006.01) B65D 33/25 (2006.01) B65D 81/32 (2006.01)
Patent
CA 2389835
The method of forming a tamper-evident plastic bag or similar container includes providing a zipper with interlocking first and second profiles with respective first and second flanges. The second flange is longer than the first flange. A distal portion (with respect to the interlocking elements of the profiles) of the second flange is sealed to the web thereby forming a transport seal to carry the zipper with the web through a form, fill and seal machine. At the form fill and seal machine hard seals are formed between the web and the first flange and a proximal portion of the second flange. The transport seal is a peel seal or alternatively the second flange is formed with a frangible section between the distal and proximal portions and the transport seal is a hard seal. In both cases the second flange provides tamper evidence and/or a hermetic barrier for the completed bag.
Finlayson & Singlehurst
Illinois Tool Works Inc.
LandOfFree
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