A physical properties calculating apparatus accepts inputs of material and
thickness of an intermediate layer, accepts inputs of material and
thickness of an outer layer, accepts inputs of material and thickness of
an inner layer, accepts an input of outside air humidity, accepts an input
of inside humidity, accepts an input of outside air temperature,
calculates the moisture content of the intermediate layer by activating a
sub-routine for calculating the moisture content of the intermediate layer
based on the accepted various information and preset information, and
calculates physical properties such as oxygen transmission rate of the
intermediate layer based on the calculated moisture content of the
intermediate layer and the accepted outside air temperature. It is
possible to know the physical properties of the intermediate layer that
forms a packaging material for packaging products to be packaged, such as
foods, without actually measuring the physical properties.
