Begin by executing program PPR. From the CODE41 Main Menu enter Program PPR and Execute PPR. The Table of Paperboard Test Data shown below should appear. The results have also been saved in file PPR.PRN and files PAPERC.PRN and PAPERM.PRN have been created.

It is critical in specifying input data that the measurement be converted to the units of measure and scale factor in the column subtitle. For instance, flexural stiffness is often determined via a Taber test and specified in Taber units. However, for program PPR the data would need to be converted to units of 0.001 lbf^.in.

In this example materials High, Arch, and Arch90 are each specified at only one basis weight value which thus, becomes the respective normalized basis weight. For material 90%, specified at three different basis weight values, the normalized basis weight is that of the lowest thickness of the lowest weight of the lowest strength paper among the group, i.e., 41.7 lbm/1000 ft². Recall from example 2.4 that when the basis weight specification in the Table of Corrugated Fiberboards was left blank, the normalized value was assigned.

Examples 2.1, 2.2, and 2.4 showed how a material could be assigned an arbitrary basis weight value. Given any basis weight, the corresponding thickness is determinable from the effective thickness-basis weight relationship as characterized by an exponent called x. (For a more complete description of how an x-value is used to relate effective thickness and basis weight read Program PPR in section 2.)

In this example program PPR determines a specific x-value for material 90%. Average stress-strain properties of the three specified papers are then assumed to represent the material behavior at all basis weights. For materials High, Arch, and Arch90 the x-value from the default linerboard is assumed to apply.