THE EFFECT OF VINYL ACETATE CONTENT AND POLYISOBUTYLENE CONCENTRATION ON THE PROPERTIES OF METALLOCENE POLYETHYLENE/ETHYL VINYL ACETATE CO-EXTRUDED FILM FOR STRETCH AND CLING FILM APPLICATIONS

摘要

A range of EVA/m-LLDPE/EVA co-extruded films, with Polyisobutylene (PIB) content from 0-20% and Vinyl Acetate (VA) co-monomer content of 6, 12 and 18%, was manufactured using a Killion cast film co-extrusion system. The films were aged at 45℃ for up to 28 days, to enable tack (cling) development. The results show that film tack strength improved significantly with ageing. Increased VA concentration in the surface layer also showed significant improvement in film tack strength. The film tensile strength, elongation and tear properties in both MD and TD were not significantly affected by increase in PIB concentration. However, increased VA content showed slight improvement in MD mechanical performance of the films, TD properties were relatively unaffected.