Package having a dual-film lid comprising a gas-impermeable film and a delaminatable, gas-permeable film
US6248380A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1996 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | Nov 25, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/15
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A dual-film package and method for making such package is disclosed which combines the manufacturing simplicity of a package having a single, peelable lid with the consistent peelability of a package having separate permeable and impermeable lids. This is accomplished by providing a support member and a lid having a gas-permeable film and a substantially gas-impermeable film. A first heat-weld bonds the gas-permeable film to the support member and a second heat-weld bonds the gas-impermeable film to the gas-permeable film. The first and second heat-welds each have a bond-strength which is greater than the intra-film cohesive strength of the gas-permeable film so that the lid preferentially delaminates within the gas-permeable film upon peeling, thereby leaving a portion of the gas-permeable film lidded to the support member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.