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Modelling permeation through porous polymeric films for modified atmosphere packaging
V Del-Valle1, E Almenar, J M Lagarón
1Instituto de Agroquímica y Tecnología de Alimentos, IATA-CSIC, Apdo. Correos 73, E-46100 Burjassot, Spain.
Food Additives and Contaminants
|March 8, 2003
Summary
Perforated films in modified atmosphere packaging (MAP) require advanced models beyond traditional laws. New models like Knudsen
Area of Science:
- Food Science and Technology
- Materials Science
- Chemical Engineering
Background:
- Modified atmosphere packaging (MAP) increasingly utilizes perforated films for fresh produce.
- These films exhibit high mass transfer rates, challenging conventional transport models.
Purpose of the Study:
- To evaluate the applicability of non-conventional transport laws for perforated films in MAP.
- To model gas and water permeation and headspace evolution in packaged produce.
Main Methods:
- Discussion and application of Knudsen's law, gas diffusivities, and Poiseuille's flow.
- Modeling experimental permeation rates of oxygen and water.
- Describing headspace gas evolution in packaged fruit products.
Main Results:
- Conventional permeability equations (Henry's and Fick's laws) are insufficient for perforated films.
- Knudsen's law and Poiseuille's flow provide applicable models for mass transport.
- Models accurately described experimental permeation and headspace changes.
Conclusions:
- Advanced transport models are essential for accurately describing mass transfer through perforated MAP films.
- Understanding these models is crucial for optimizing MAP systems for fresh produce.
- The study provides a framework for predicting and controlling headspace composition.