Powdered resins were prepared from softwood or hardwood spent sulfite liquor (SSL) by acidifying and spray-drying, and they were used as binders for particleboard. The strength properties and dimensional stability of the board were evaluated. The results obtained were as follows.
(1) The particleboard with SSL powder showed good dimensional stability, but low modulus of rupture (MOR) and low internal bond (IB).
(2) The effects of spray-drying temperature of SSL on the properties of the board were little in the range from 120°C to 150°C.
(3) The board with softwood SSL powder was better in both strength properties and dimensional stability than that with hardwood SSL powder.
