Study on Chemical Coloration of Eucalyptus Veneer

Taking FeCl3, Fe2（SO4）3, CuSO4, K2Cr2O7, Na2Cr2O7 and KMnO4 as ingredient chemicals to prepare the chemical coloration formula for eucalyptus veneer, 16 chemical preparations were composed finally. According to the coloration effect and the coloring depth inside the veneer, PBC-1 was screened out as the most suitable one. To get the optimal parameters for coloration treatment of eucalyptus veneer under normal atmospheric pressure condition, the factors that influenced on the coloration effect on eucalyptus veneer were analyzed through an orthogonal test by taking PBC-1 as treatment chemical. The results showed that the significance order of the discussed factors influencing the coloration effect was: chemical concentration > treatment time duration > reaction temperature > bath ratio. The optimal technological parameters for chemical coloration treatment of eucalyptus veneer were as follows: 08% of PBC-1 as the chemical solution, 15∶1 as bath ratio, 10h of treatment time duration at 70℃ solution temperature. The eucalyptus veneer treated with above technological parameters would be characterized as evenly dark brown with a color effect of teak wood, and the color difference problem caused by the numerous knots on the surface of eucalypt veneer would be overcome perfectly.