Resin Efficiency in Particleboard as Influenced By Density, Atomization, and Resin Content

Resin efficiency in particleboards was studied using a Douglas-fir flake-particle mixture. Two levels of board density and resin atomization and three levels of resin content were studied. In the density range studied (40 – 45 lbs./cu. ft.), static bending strength and thickness swelling approach optimum levels at resin contents below 8 percent. Internal bond strength continues to increase with increasing resin content. Resin efficiency was found to be significantly affected by the three primary variables with degree of atomization and resin content controlling the distribution and coverage of resin on wood particles, and density contributes to the interparticle contact area and pressure required for optimum bonding. The use of multiple regression equations showed that with proper resin efficiency, reductions could be attained by either or both board density or resin requirements for a board of desired strength levels, as compared to the same board prepared with poor resin efficiency. A simple technique for estimating coverage of wood particles with dyed resin was described. The method used a photoelectric reflection photometer and while the technique was quite unrefined at present, this appears to be a promising area for further research.

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