Conventional Versus Plasma Assisted Deposited AIOx Coatings on PET Films in Roll-to-Roll Metalizers

Conventional Versus Plasma Assisted Deposited AIOx Coatings on PET Films in Roll-to-Roll Metalizers

Dr. Anye Chifen
Buhler Leybold Optics

How was the film deposited, and for what is it good with respect to food packaging?

This is the main subject of this paper, the structure-property relations of two methods used to deposit transparent aluminium oxide films on PET substrates. An experimental microscopic analysis of the AlOx films deposited by (1) plasma assisted deposition and (2) conventional reaction oxidation will be presented. The primary goal for the food packaging industry is the protection of the purchased product inside, which is strictly evaluated to the freshness (transparency) and extend shelf-life (barrier). Although, the consumer preferences are constantly evolving which brings along tremendous opportunities for innovation in packaging films.

As such, in order to answer the question, “how good is the deposited film for my application?” this paper focuses on the influence of the deposition method on the microstructural investigations, indicating how physical behaviour are dependent on the chemical structure. More-detailed evaluation using scanning electron and atomic force microscopes were used to correlate the results of oxygen and water vapor barrier properties of the films as achieved for both deposition methods. Bearing the fact, the consumption of flexible packaging film has propelled to astonishing figures due to their importance in food packaging, thus understanding the properties of both deposition methods widens the application of these films for food packaging.