On the Measurement of Fiber Orientation in Fiberboard

An attempt to measure the vertical component of fiber orientation in fiberboard is described. The experiment is based on the obvious reduction of the furnish fiber length which occurs by cutting thin microtome sections of the board parallel to the board plane. Only when no vertical fiber orientation component is present will the fibers contained in these sections have the same average length as the fibers in the board at large. Increasing deviation of fiber alignment from the board plane will result in shorter fiber lengths in the microtome sections. These relationships could be predicted by computer analysis. The comparison of actual measurement of fiber lengths in microtome sections with fiber lengths estimated by computer for different fiber orientations allowed the estimation of the actual vertical orientation component in a medium-density fiberboard sample. An automatic optical image analyzer coupled to a microscope was used for fiber length measurement.

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