Normal Resin Distribution in Particleboard Manufacture

In studies of resin distribution, a number of UF resin treated furnishes obtained from both production and laboratory sources were examined for correlation and straight line regression of resin treatment by screen fraction. Correlation which was significant for the raw data was substantially improved by modifying screen analysis values with estimated values for particle volumes. These estimates were obtained from the relationship of mesh openings for the individual screens of the fractions in question to the coarsest screen employed. Using these factors as a measure of relative volumes, other factors for obtaining and comparing surface areas of the different screens were calculated. Southern pine shavings boards were made using predicted resin distributions. The study concluded that: The amount of resin picked up by individual fractions of a typical furnish is determined both by the total volume and numbers of particles per fraction. Contrary to the popular belief that “fines rob resin”, spread rate determinations indicated that coarse particles receive more resin than the area they contribute. Board strength properties can be maintained for changing furnishes by keeping spread rates constant. In addition, constant spread rates with boards of the same density, the finer a furnish becomes, the better its dimensional stability as exhibited by 24 hour water soak characteristics.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member