POLYESTER ALUMINIUM ADHESION - IMPROVEMENT BY HEAT-TREATMENTS/

Because of its industrial importance, poly(ethylene terephthalate) (PE T) has been the subject of numerous studies concerning surface modific ations in order to improve its bonding ability. Most of the previously reported surface treatments performed before the metallization provid e good dry adhesion of vapour deposited metallic layers. However, food packaging applications also require good wet adhesion and strong oxyg en barrier properties. Heat treatments have been found to improve thes e properties. Hence, the aim of this study was to isolate an efficient heat treatment for the metallized PET films suitable for industrial a pplication. The adhesive performance of aluminized polyester films has been assessed by use of an ultrasonic vibration test.