EFFECT OF CRYSTALLIZATION AT FILM INTERFACE IN HEAT SEALING PROCESS

摘要

Effect of crystallization at film interface in heat sealing process was studied. Heat sealing is a general technique used for joining polymer film. The technique is widely used for processing plastic bag. Heat seal temperature at sealed film interface is an important factor to control heat seal properties. In this study temperature profile at sealed film interface in-situ heat seal process was precisely measured by a fine thermocouple. Molecular structure development at film interface was investigated by wide angle x-ray diffraction (WAXD) and differential scanning calorimetry (DSC). In heating and cooling process temperature profiles were obtained. The heating and cooling rate depended on crystallization behavior in heat sealing process. We concluded that crystallization is a major factor to affect heat seal properties.