Interference input data are intended to provide a way to empirically correct for unknown corrugator variables. The data base used to calibrate program ECT (figure 10) contained a mixture of A-, B-, and C-flute data. Program accuracy was found to be consistent among the three flutes when the default interference was assumed to apply. In cases where the calibration needs to be improved, other interferences can be specified.

To see how interference data affects the ECT predictions edit the data base in file FLUTE.BSE to appear like the data below. Then remove materials

Dflt-L and Dflt-M from file PPR.BSE and execute program PPR. Next edit file PPR.BSE to contain the input data below. Execute ECT. Short column strength

is a function of the microplate widths, and thus of the liner-medium interference. Bending stiffness is a function of combined board caliper and is shown to also vary with the specified interference.