BIAXIALLY-ORIENTED POLYOLEFIN FILM WITH IMPROVED SURFACE PROPERTIES

摘要

The invention relates to a method for increasing the surface tension on biaxially stretched films made of thermoplastic polymers. According to said method, a film is first treated on a surface by means of an atmospheric pressure plasma before being stretched transversally or simultaneously across the width thereof, and the film is additionally subjected to a second treatment by means of a corona or flame after being stretched transversally or simultaneously, said second treatment being done on the same surface which has already been plasma-treated.