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Effect of Regrind Content on PP-EVOH Sheets Properties and Effect of Orientation on Permeability of EVOH Multilayer Films

Lili Wang

Masters thesis (2019)

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Cite this document: Wang, L. (2019). Effect of Regrind Content on PP-EVOH Sheets Properties and Effect of Orientation on Permeability of EVOH Multilayer Films (Masters thesis, Polytechnique Montréal). Retrieved from https://publications.polymtl.ca/4013/
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Abstract

Résumé: Les emballages alimentaires jouent un rôle clé dans la fraîcheur et la conservation des aliments. Une des fonctions principales des emballages alimentaires est d’empêcher le passage de l’oxygène à travers l’emballage. Ainsi, il est nécessaire d’utiliser des matériaux hautement étanches à l’oxygène pour cet usage. Parmi les différents polymères, Le copolymère éthylène-alcool vinylique (EVOH) a une perméabilité très faible à l’oxygène, c’est pourquoi il est largement utilisé pour les emballages hautement étanches. Cependant, EVOH est sensible à l’humidité et coûteux. Des films multicouches sont utilisés pour diminuer les coûts, et EVOH est habituellement inséré entre deux couches résistantes à l’humidité. L’objectif de ce projet de recherche est de déterminer des méthodes pour réduire les coûts liés à l’EVOH dans les films multicouches.----------Abstract: Food Packaging keeps food fresh and extends shelf life. One of the most important functions of food packaging is preventing oxygen transmission through the package. Therefore, it is necessary to use high oxygen barrier materials in food packaging. Among different polymers, Ethylene vinyl alcohol (EVOH) has a very low oxygen permeability and is widely used in high barrier packaging, however, EVOH is an expensive material and sensitive to moisture. Multilayer films are used to decrease the cost and EVOH is usually sandwiched between two moisture barrier layers. The objective of this research was to find the ways to decrease the cost of multilayer films. This thesis begins with reviewing literature. Firstly, the importance and requirements of food packaging, including barrier properties, mechanical properties, thermal properties and optical properties are introduced. The next section in the literature review discusses important aspects of EVOH including its crystallization, nature of good oxygen barrier properties and its moisture sensitivity. Previous studies on EVOH drawbacks and some applications of EVOH multilayer packages are also reviewed. Originality and objectives of this research are presented at the end of literature review.

Open Access document in PolyPublie
Department: Département de génie chimique
Dissertation/thesis director: Abdellah Ajji and Ebrahim Jalali Dil
Date Deposited: 18 Nov 2019 13:16
Last Modified: 18 Nov 2019 13:16
PolyPublie URL: https://publications.polymtl.ca/4013/

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