Method for forming smooth walled flexible package
US4727706A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 7, 1987 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | May 7, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24826
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A sealable package (20) in accordance with this invention includes an inner bag or container (24) located within an outer bag or container (26). The inner bag is formed of a flexible sheet (40) of material resistant to the passage of gas therethrough. The outer bag is formed of a flexible sheet (42) of material. The inner bag is secured to the outer bag along its top (32) and bottom (30) edges and along a vertically oriented back seam (52) by areas (44) of adhesive interposed therebetween. The adhesive areas define passageways (58) therebetween through which air from the ambient atmosphere may flow to enter into the space (28) between the two bags. The inner bag is arranged to be filled with some material (22) and then vacuumized and the top sealed closed. The gas space between the inner bag and outer bag enables the outer bag to provide a smooth, aesthetically pleasing appearance notwithstanding the fact that the inner bag may be in close conformance to the surface of the contents stored therein as a result of the vacuum. The package is formed by applying adhesive in prepatterned areas along selected portions of webs or sheets to form the package, sealing the sheets together, and …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.