Spent Sulfite Liquor Binder for Exterior Waferboard–A Progress Report

High-strength poplar waferboard can be made with acidified spray-dried spent sulfite liquor (SSL) powder as an adhesive and with a press cycle time similar to that used in commercial phenolic waferboard production. In general, laboratory-made SSL waferboards showed aging characteristics similar to those of commercial phenolic waferboard when the conventional accelerated aging treatments were applied. However, these conventional accelerated aging treatments are mainly designed to predict the long-term durability of phenolic bonds in wood composites. The acidic SSL bonds may behave differently from the phenolic bonds in long-term performance. Further laboratory work is being carried out to determine the effect of acid on long-term durability of SSL-bonded waferboard.

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