Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

Improved material characteristics in metal polyester packaging film

The goals of the research were to increase metal polyester adhesion in food packaging materials, especially in a humid environment, and to increase the barrier to oxygen permeation of the metallized film.

The site of chemical bonding between aluminum atoms and polyester molecules was shown to be the carbonyl groups. The first monolayers of aluminum on a polyester surface are strongly oxidized, whereas the bulk of the aluminum is in the metallic state, growing in columns. Failure of the metal polyester bond occurs in most cases within the polyester, except in humid environments which lead to interfacial failure. Significant effort was put into the improvement and development of adhesion tests. The dependence of both adhesion and the oxygen barrier on the different parameters of the metallization process was assessed. The influence of thepolyester film manufacturing process was investigated and optimal parameters defined. The effect of the surface treatments on both properties was studied.

Improvements in adhesion and reduced oxygen permeation were achieved.


Marianne KOENIG
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