Response data of melting surface temperature of the several ℃ serrations are respectively necessary for the setting of “the proper heating range” of the heat sealing. It is convenient that “the proper heating range” of heat sealing is estimated on the basis of measured data of one or two temperature condition, if it is possible. The temperature rising pattern of the object by the heating is decided in heat capacity and heat transfer characteristic of the object Therefore, simulation data were made by the setting of the ratio of the gradient of beginning and end point temperature of the melting surface temperature, that was estimated by the application of electronic circuit theory with temperature gradient of measured data of the melting surface temperature. The good coincidence was observed between this simulation result and measured value It was proven that this knowledge could be effectively utilized for the verification of the reliability of the heat sealing.

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