Storage temperature effects on the sealing properties of corona-treate
d polypropylene film were investigated. Samples of film stored at room
temperature, 50-degrees-C, 75-degrees-C, 100-degrees-C, and 125-degre
es-C for a period of 48 hours showed dramatic changes in both sealing
temperature and sealing range, with sealability rapidly declining with
increases in storage temperature. Differential scanning calorimetry w
as used to assess changes in crystallinity of the samples. Total cryst
allinity was found to increase with storage temperature. This in turn
affected the film's sealability.