Roll-to-roll coating machine R2R

for film coating

Aluminum oxide barrier coatings on polymer films for food packaging applications Highlights AlOx barrier coatings deposited via reactive thermal evaporation onto polymer films. Effect of plasma treatment on barrier performance was investigated. Uncoated films were characterized in terms of topography and surface energy. Surface energy and adhesion of AlOx coating were determined. AlOx barrier performance depends on surface characteristics of uncoated films. Substrate materials Various packaging grade BOPP films and a PET base film (all corona treated in-house by the film producers), as well as a BOPP film coextruded with a special high surface energy polymer as a skin layer were coated with an aluminum oxide barrier layer. The coatings were applied to the corona treated side of each film and the high surface energy polymer skin layer, respectively. All standard packaging grade BOPP films Barrier properties of packaging grade PET and BOPP films, coated with aluminum oxide via reactive thermal evaporation, are strongly affected by the surface characteristics of the plain film, such as surface defects and surface chemistry. These parameters have a large impact onto the aluminum oxide coating nucleation, growth and structure and not only vary to a large extent between the different polymer film types, but can also change significantly within one substrate type, as has been shown