Reclosable packaging with gas barrier incorporated in zipper
US6830377B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 30, 2002 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Jun 28, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T24/2532
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A flexible zipper incorporating a layer of gas-impermeable thermoplastic material in one or both flanges. The zipper is installed in the mouth of a reclosable package or bag made of gas-impermeable material shaped to form a receptacle. The gas-impermeable web material of the receptacle and the layer of gas-impermeable material of the zipper form a substantially gastight enclosure for preserving the perishable contents of the package. Flexible zippers having a layer of gas-impermeable thermoplastic material joined to a layer of gas-permeable thermoplastic material are preferably manufactured by a coextrusion process. The resulting gas barrier inside the receptacle has a zone of preferential tearing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.