Document Detail

Problems encountered for food safety with polymer packages: chemical exchange, recycling.
MedLine Citation:
PMID:  9828353     Owner:  NLM     Status:  MEDLINE    
When a polymer is in contact with a liquid, generally some matter transfers take place: the liquid enters the polymer, while some additives leave the polymer. This fact is responsible for a reduction in the properties of the polymer and pollution of the liquid food is obtained. However, it is sure that, on account of their outstanding properties, food packages are becoming more and more based on polymers. The process of mass transfers is controlled by transient diffusion, and these theoretical problems are so complex that only numerical models are able to resolve them. New difficult problems appear with the desire of recycling old food packages made of polymers by reusing them as new food packages. Of course, because of the potential contamination brought with this recycled polymer, the package is made of bi-layer or tri-layer films where the reused polymer is located between two virgin polymer layers. As it takes some time for the contaminant to diffuse through the virgin layer, this latter plays the role of a functional barrier to pollution. The various difficulties in the whole problem are considered in succession: the coextrusion of the films where a contaminant transfer already occurs; and the effect of the liquid food which may enhance the diffusion of the contaminant. Various master curves are drawn by using dimensionless numbers, so as to make the results quite general and of use from a practical point of view.
J M Vergnaud
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Advances in colloid and interface science     Volume:  78     ISSN:  0001-8686     ISO Abbreviation:  Adv Colloid Interface Sci     Publication Date:  1998 Nov 
Date Detail:
Created Date:  1998-12-11     Completed Date:  1998-12-11     Revised Date:  2005-11-16    
Medline Journal Info:
Nlm Unique ID:  8706645     Medline TA:  Adv Colloid Interface Sci     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  267-97     Citation Subset:  IM    
Laboratory of Materials and Chemical Engineering, Faculty of Sciences, University of St-Etienne, France.
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MeSH Terms
Conservation of Natural Resources*
Food Contamination*
Food Packaging*
Polymers / adverse effects*,  chemistry*
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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