Packaging method
US5832699A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 1, 1993 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Apr 1, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D81/24
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The invention provides methods of packaging plant materials. The plant materials are packaged in a perforate polymeric film, the film being of a polymer having a water vapor transmission rate and an oxygen transmission rate which improve the shelf lives of the packaged materials. The film is selected so that the water vapor transmission rate is substantially that inherent to the film, and the oxygen transmission rate is controlled by the size and/or frequency of perforations in the film. Typically the perforations will have a mean diameter of not more than 100 microns, and preferably from 40 to 60 microns. The frequency of perforations will usually be not more than 1000 per square meter, although at least 10 per square meter will usually be required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.