ENHANCED BARRIER IMPROVEMENT FOR PET-BOTTLES BY COMBINATION OF INTERIOR AND EXTERIOR PLASMA ASSISTED COATING

摘要

Even though PET-bottles gain more and more market shares one crucial point is their insufficient permeation barrier. To overcome this disadvantage and to extend the shelf-life plasma assisted coating is a well known technique, which is industrially used. The coating is either deposited on the interior or exterior of the bottle. Typically barrier improvement factors (BIF) around 4 can be achieved for the gas carbon dioxide (CO_2). A combination of both techniques leads to a significant increase of the BIF. Hence the technology enables applications for even more sensitive goods.