[Research into the mechanism of fragile sealing on the composition packet]

The research into the fragility of the sealing on two composition films for ham packages by using Fourier infrared spectrometer, DTG and melting index detector is reported. The research shows that the cause of the fragility of the sealing is the differences in the materials and their softening points and melting indexes between the inner film and the outer film. The inner film is made of adhesive polypropylene, whose softening point is 148.8 degrees C and melting index (MI) is 6.049 g/10 min. However, the outer film is made of polyamide 610, whose softening point is 221 degrees C, 72.2 degrees C higher than that of inner film, and melting index is 3.09 g/10 min, almost half of the MI of inner film. The mechanism of the fragile sealing on the composition packet is also discussed.