Fiberboards from Loblolly Pine Refiner Groundwood: Effects of Gross Wood Characteristics and Board Density

The effects of gross wood properties on the physical characteristics of wet formed fiberboards were studied in a factorial experiment. Fiber, derived from different parts of the log (Pinus taeda L.), and therefore having different properties, was made into boards of three different specific gravity classes. Seven board properties were measured to determine the effects of the various fibers, and hence the gross wood properties. The wood properties chosen for study were specific gravity of extracted and unextracted wood, growth rate in rings per inch, and proportion of latewood. The board properties measured were: tension parallel to surface, tension perpendicular to surface, stress at proportional limit, modulus of elasticity, modulus of rupture, lineal dimensional change, and thickness dimensional change. The gross wood properties of specific gravity, proportion of latewood, and growth rate were found to affect strength of the fiberboard in tension and bending, and dimensional stability. It was determined that most properties were improved by using fiber from dense wood having a low latewood content.

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