Method for manufacturing tamper evident reclosable plastic bags
US7413535B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 27, 2001 |
| Grant date | Aug 19, 2008 |
| Priority date | — |
| Expiry date | Oct 12, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B70/8133
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.