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Heat sealing is currently a standard method for manufacturing plastic bags of polylactic acid film, which has high clarity and strength. However, the heat sealing of polylactic acid is difficult because its strength declines at high temperatures. Processing conditions such as the heat sealing temperature and pressure can greatly affect the mechanical properties of the heat sealed part. In this study, the relationship between the heat sealing temperature and the mechanical properties of heat-sealed polylactic acid film were examined through peel strength tests and tensile testing of samples with circular notches. Differential scanning calorimetry (DSC) and FT-IR imaging were used to investigate the dependence of crystallinity and molecular-orientation ratio (MOR) on the heat sealing temperature. These studies showed that the optimum heat seal temperature was 128•Ž, with a very narrow temperature window. Thus, precise control of the heat sealing tem-

Effect of Heat Sealing Temperature on Mechanical Properties and Molecular Structure of Heat-sealed Polylactic Acid Film