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The distribution of sodium sulfite was non-uniform throughout an impregnated black spruce wood chip following passage through a screwfeeder with a compression ratio of 3:l. Concentrations of sulfite and bound sulfur were higher in earlywood than in latewood because of morphological differences. Bound sulfur was more uniformly distributed in a more destructured chip than in a less destructured one. The desired destructuring was achieved by using a screwfeeder with a higher compression ratio such as 5:1 which increased the sodium sulfite uptake significantly within a range from 20 to 48%. The uniformity of sulfite distribution was also improved by prolonging the residence time of impregnated chips in the preheater.
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Uniformity of Sodium Sulfite Distribution in Impregnated Black Spruce Wood Chips, 1991 International