Tamper-evident pull tab induction liner with improved moisture migration resistance and method of sealing with same
US5860544A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 1, 1997 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Apr 1, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2251/0093
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A tamper-evident heat induction liner for sealing a container includes at least four stacked layers and exhibits improved resistance to moisture migration. A heat seal polymer layer is provided for induction bonding against a container opening. A moisture-impermeable foil layer is secured against the polymer layer opposite the container opening. Tear-resistant backing layer is provided, and is secured to a low cohesive strength layer which is disposed between the backing layer and the foil layer. The low cohesive layer splits when the backing layer is lifted, leaving the foil layer and polymer layer with a portion of the split low cohesive strength layer covering the container opening in a tamper-evident, rupturable manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.