| 摘要 |
The method of forming a tamper-evident plastic bag (10) includes providing a zipper (24) with interlocking first and second profiles with respective first and second flanges (46,44). The second flange (44) is longer than the first flange (46). A distal portion (48) (with respect to the interlocking elements (40,42) of the profiles) of the second flange (46) is sealed to a web (28) thereby forming a transport seal to carry the zipper (24) with the web (38) through a form, fill and seal machine. At the form fill and seal machine hard seals are formed between the web (38) and the first flange (44) and a proximal portion of the second flange (46). The transport seal is a peel seal (30) or, alternatively, the second flange (46) is formed with a frangible section (32) between the distal and proximal portions and the transport seal is a hard seal (30a). In both cases the second flange (46) provides tamper evidence and/or a hermetic barrier for the completed bag (10). <IMAGE> |
