The phenol formaldehyde(PF) resin adhesive was modified to manufacture the wood-based panel adhesive with the extract from P.elliotti barks.By means of the L9(34)orthogonal experiment design,the optimum processing conditions of producing modified PF adhesive were found out.They are: reaction temperature at 90℃;reaction temperature at 25 min;the mol ratio of catalyst and total phenols being 0.06∶1;and 40% of phenol replaced by the extract from P.elliotti barks.The quality of the plywood pressed can meet the ...