Edit file RSC.BSE and make the data containing Yes-No criteria appear like the line below. This will activate program RSC to

determine strength in all possible flute directions and load orientations (figure 8). Add the input data from the input and output shown below

and execute RSC. Depending on computer speed you might notice that program running time increases when all strength calculations

are activated. Program RSC has been calibrated for only top-to-bottom loading and end-to-end loading of vertically fluted boxes. Thus, the strengths for other loading conditions are surrounded by braces, i.e., { } to show that they lie outside the calibration range.

Materials 200Ch and 275Ch were derived by substituting a high strength linerboard for the single face and double back components in materials 200C and 275C, respectively. The high strength linerboard was characterized as having a higher strength in the cross machine direction (CD) without a proportional strength increase in the machine direction (MD). Such paperboards can be achieved by controlling the fiber alignment on the paper machine.

The result of substituting a high strength linerboard is shown to yield a higher top-to-bottom strength compared to the strength due to 200C and 275C materials. Although box strength increases for top-to-bottom loading (column 5) when switching from material 200C to 200Ch or from material 275C to 275Ch, strength decreases for end-to-end loading (column 7). For other loading conditions (columns 6, 8-10, figure 8) box strength decreases whenever the combined board facings are loading in the MD. For this particular material the user would need to evaluate the possible box loading conditions before recommending the high strength linerboard.

All these examples have utilized the data bases of stress-strain properties stored in file PLATEC.PRN and file PLATEM.PRN. These files are considered as transparent and the user is thus not required to interpret them. The small number of specific material codes from these examples could be further used to examine the operation of program RSC for other box dimensions. However, to build a data base of user specified materials the next step is to examine program ECT, Example 2.1.