Effect of Processing Parameters on Essential Work of Fracture Toughness of LLDPE Blown Films

摘要

Blown film process is one of the most attractive processes for producing low-cost, high-performance polyolefin films. In this study, mode-I essential work of fracture (EWF) analysis and Elmendorf tear test were performed on m-LLDPE films to investigate how different processing conditions influence blown film EWF and tear properties. After the EWF test, the film was carefully characterized, especially within the necked zone. Effects of frost-line height, draw down ratio, blow-up ratio, and haze-zone region on the EWF parameters of the films were determined. Correlation between the EWF parameters and the films' Elmendorf tear properties was also made. The usefulness of the EWF test for investigating ductile polymeric blown films fracture performance is discussed. (C) 2015 Society of Plastics Engineers