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Effect of heat-sealing temperature on the properties of OPP/CPP heat seals. Part II. Crystallinity and thermomechanical properties

✍ Scribed by Tsujii Tetsuya; Yasuo Hashimoto; U. S. Ishiaku; M. Mizoguchi; Y. W. Leong; Hiroyuki Hamada

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
305 KB
Volume
99
Category
Article
ISSN
0021-8995

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✦ Synopsis

Abstract

The crystalline structure of the heat‐sealed part of oriented polypropylene (OPP) and cast polypropylene (CPP) films was investigated by differential scanning calorimetry, Fourier transform infrared spectroscopy, and thermal mechanical analysis (TMA). The relationship between the crystalline structure and the mechanical properties was analyzed. It was found that the high total crystallinity of both OPP and CPP gave rise to good mechanical properties and that the orientation of the crystalline structure in the OPP film also was an important factor. The optimum condition for heat sealing was the temperature at which total crystallinity was highest while still retaining the crystalline orientation of OPP. The assessment of crystalline orientation by TMA is an innovation initiated by the authors. Β© 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 513–519, 2006

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