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Tests for Z-Direction fiber orientation

Fibers that acquire a Z-direction tilt in the forming process help bond adjacent strata of the paper sheet, increasing Z-direction shear and other properties. For certain tests, this manifests itself as a test difference upon 180 in-plane rotation of the sheet. Seven of eight different paper grades ranging in grammage from 73 to 268 g/m2 were found to show this difference for Scott internal bond tests, directional brightness tests, or both. Directional effects were compared using an extensional and a shear metric. One-third of comparisons showed significant directional effects at the 75-100% confidence level, including roughly equal numbers of Scott bond and brightness comparisons. However, the two tests did not reinforce each other strongly; agreement regarding directional effects occurred in only 60% of comparisons. The number of significant effects in the cross-machine direction matched those in the machine direction (MD), suggesting a more complex model may be needed. The best support for the fiber-tilt model was in the case of MD Scott-internal-bond testing.