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Migration à partir de bouteilles en PET recyclé. Elaboration et validation d'un modèle applicable aux barrières fonctionnelles

Abstract : Polymers (food packaging) could sorb dangerous substances (pollutants : pesticides, oil, etc ... ) before and during collecting for recycling. Reuse and recycling of these plastics in food packaging is proposed to reduce their amounts but could affect food safety and consumers health by migration of these pollutants in the food. Functional barrier concept has been proposed as a way to protect food from migration of potential pollutants. It consists of inserting, in new packaging, recycled polymer between two layers of virgin material which will delay migration into food.

Modelling such diffusion and migration allowed to predict time-lag and then, safety period of such material. Numerical analysis is necessary to make a complete modelling of all mass transfer phenomenon involved :

- diffusion in functional barrier during the process of PET preform : the diffusion coefficient is a function of local temperature which depends on time and localisation in the thickness (the temperature diffusion follows Fourier's laws and mater diffusion Fick's laws). Surface kinetic factors are taken into account.

- diffusion / migration of pollutants during food contact : the diffusion coefficient of pollutants is function of the local concentration of liquid simulant in the polymer.

Model and practical experiments including all possible contacts with food are compared for model substances diffusivities determination. For this purpose, a list of model substances, which cover all properties of chemicals encountered in real pollution solution (volatility, polarity, solubility in water,...), has been established. The diffusivities of these model substances give us extrapolation and overestimation of migration kinetics for all potential pollutant molecular weight for direct contact with food (monolayer bottles) and for functional barrier use (PET and plasma deposit barrier). These results will participate to elaboration of EEC regulations for the use of PET for food contact after recycling.
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Contributor : Pierre-Yves Pennarun <>
Submitted on : Saturday, November 12, 2005 - 8:31:25 PM
Last modification on : Wednesday, September 4, 2019 - 1:34:02 PM
Long-term archiving on: : Friday, November 25, 2016 - 9:46:40 AM

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Pierre-Yves Pennarun. Migration à partir de bouteilles en PET recyclé. Elaboration et validation d'un modèle applicable aux barrières fonctionnelles. Matériaux. Université de Reims - Champagne Ardenne, 2001. Français. ⟨tel-00010957⟩

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