In order to explore the influence mechanism of the surface texture height difference of the heat sealing knife on the heat sealing strength of the multilayer composite film.Three-layer PET/PE composite membrane was used as the heat sealing object,took the trapezoidal texture on the surface of heat sealing knife as an example,the influence of trapezoidal texture height difference of heat sealing knife surface on the temperature distribution of composite film heat sealing interface was analyzed by heat conduction theory calculation and simulation test.Based on this,the relationship between the trapezoidal texture height difference on the surface of the heat sealing knife,the heat sealing strength of the composite film and the adhesive force of film was explored;Finally,the correctness of the influence of the trapezoidal texture height difference on the heat sealing strength of the composite film was verified by the heat sealing strength test of the composite film.The results showed that for the three-layer PET/PE composite film,the trapezoidal texture height difference on the surface of the heat sealing knife was positively correlated with the heat sealing strength of the composite film in the range of 0～0.09 mm.Beyond this range,the trapezoidal texture height difference on the surface of the heat sealing knife was negatively correlated with the heat sealing strength of the composite film.
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