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High Pressure Research
An International Journal
Volume 30, 2010 - Issue 4
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Selected papers from the 6th International Conference on High Pressure Bioscience and Biotechnology (HPBB 2010) in Freising (Germany)

High pressure-induced structural effects in plastic packaging

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Pages 555-566 | Received 25 Jul 2010, Accepted 11 Oct 2010, Published online: 14 Dec 2010
 

Abstract

Today, flexible vacuum packages are predominantly used for products to be subjected to high pressure treatment. However, tray packages with a modified atmosphere are in demand, which provide a high failure rate with respect to gas and water vapour permeability and packaging integrity. Methods to follow permeation processes under high pressure were developed and used together with optical microscopy, confocal scanning laser microscopy, Raman spectroscopy and atomic force microscopy to identify the mechanisms for changes in permeability and damage to the packaging materials. Single film samples and pouch packages filled with model products were studied. Results indicate a reversible decrease in the coefficients of diffusion and permeation under the impact of high pressure, due to the compression of the polymeric bulk. Irreversible changes in the polymeric materials are associated with gases in the packaging head space, which cause high local temperatures and create damage due to rapid deliberation upon the pressure drop at the end of the high pressure cycle.

Acknowledgements

Funding of a part of this work by the Deutsche Forschungsgemeinschaft, grant-number WE 989/13-1, is gratefully acknowledged.

Additional information

Notes on contributors

Tobias Richter

Multivac GmbH, Bahnhofstr. 4, 87787 Wolfertschwenden, Germany.

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