Vacuum packaging with hermetic reclosure
US5167974A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1991 |
| Grant date | Dec 1, 1992 |
| Priority date | — |
| Expiry date | Dec 4, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2575/365
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A package is provided for enclosing a proteinaceous product under vacuumized and hermetically sealed conditions. The package has a peelable hermetic reclosure and a body member of semi-rigid preformed plastic with a first planar marginal portion and a central portion shaped to provide a packaging chamber. The package also has a flexible dimensionally stable base member having a corresponding second planar marginal portion and a central portion to provide a closure for said packaging chamber. The two planar marginal portions are adhered together face-to-face by an adhesive to provide at least a portion of the hermetic seal wherein said adhesive is a high molecular weight pressure sensitive hot-melt adhesive having a viscosity of between about 5,000 and about 100,000 centipoise at 300.degree. F. and said adhesive provides a peelable hermetic reclosure. Curling and wrinkling of the flexible base member are precluded by utilizing a flexible base member that is a film component, preferably a polyolefin film component, which has a coefficient of thermal expansion that is equal to or greater than that of the semi-rigid preformed plastic body member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.