Effects of Heat Seal Temperature, Peel Temperature and Peel Speed on Peel Strength of Poly(Ethylene Terephthalate) Film Laminated Electrolytically Chromium Coated Steel

Abstract

We investigated the adhesion between electrolytically chromium coated steel (ECCS) and poly(ethylene terephthalate)(PET) film by T-peel test. The ECCS and the PET film were heat sealed at a temperature between 80°C and 300°C, and then the peel strength was measured at a peel temperature of 20°C and a peel speed of 200 mm/min. The peel strength increased with increasing heat seal temperature up to 200°C and then it slightly decreased with increasing heat seal temperature above 200°C because the molecular weight of the PET film decreased with the degradation of PET in this temperature range. Secondly, the peel strength of the sample heat sealed at 300°C was measured at a peel temperature between-30°C and 100°C and a peel speed between 1 mm/min and 1000 mm/min. The peel strength depended on the peel temperature and speed and then it was brought into the time-temperature superposition principle. The master curve obtained from the principle showed that the peel strength was large under the conditions of low temperature and high speed and it was small under the conditions of high temperature and low speed.