Predicting the permeability and tensile behavior of high density polyethylene/tie/polyamide 6 three-layer films

Abstract

Multilayer films with multiple properties have been widely applied in the packaging industry. In order to know the two most important properties, ie permeability and tensile property, of the multilayer films, we examined model predictions and the properties of the individual component layers to provide an efficient method to design desired multilayer structures. The series model was employed for predicting permeability; there is good agreement between experimental data and this model for predicting both gas and water vapor permeabilities of three-layer films with various thickness fractions of polyamide 6 (PA-6). We can also predict the parameters of the constitutive equation, which described the plastic deformation of the three-layer films, from those of the individual component layers, with particularly high accuracy by using the additive rule. However, there was a larger discrepancy between the model and experimental data at high crosshead speeds due to the generation of heat during deformation. (C) 2004 Society of Chemical Industry.