Effects of heat seal temperature, peel temperature and peel speed on peel strength of poly(ethylene terephthalate) film laminated electrolytically chromium coated steel

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 degrees C an d 300 degrees C, and then the peel strength was measured at a peel temperat ure of 20 degrees C and a peel speed of 200 mm/min. The peel strength incre ased with increasing heat seal temperature up to 200 degrees C, and then it slightly decreased with increasing heat seal temperature above 200 degrees C because the molecular weight of the PET Alin decreased with the degradat ion of PET in this temperature range. Secondly, the peel strength of the sa mple heat sealed at 300 degrees C was measured at a peel temperature betwee n -30 degrees C and 100 degrees C and a peel speed between 1 mm/min and 100 0 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 sma ll under the conditions of high temperature and low speed.