Patent ID: 6882957

Claim:
A method for calculating physical properties using a physical properties calculating apparatus which comprises inputting means, storing means previously storing equations and constants used for calculating physical properties, and calculating means, and calculates physical properties of an intermediate layer sandwiched between a layer on one side and a layer on other side of a packaging material composed of a plurality of layers, characterized by comprising the steps of: accepting material and thickness of said layer on one side, material and thickness of said layer on the other side, and humidity and temperature on the one side and the other side, by said physical properties calculating apparatus through said inputting means; calculating humidity of said intermediate layer by said calculating means of said physical properties calculating apparatus with use of the equations and constants previously storing in said storing means, based on material and thickness of said layer on one side, material and thickness of said layer on the other side, and humidity and temperature on the one side and the other side; and calculating physical properties of said intermediate layer by said calculating means of said physical properties calculating apparatus with use of the equations and constants previously stored in said storing means, based on the calculated humidity of said intermediate layer.