Package making – Methods – Wrapping contents including cover forming
Patent
1993-04-01
1998-11-10
Johnson, Linda
Package making
Methods
Wrapping contents including cover forming
53432, 426415, 426419, B65B 1100, B65B 3100
Patent
active
058326995
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.
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Briones et al., International Journal of Food Science and Technology (1992), 27, 493-505.
Johnson Linda
Sidlaw Flexible Packaging Limited
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