New Process for Longitudinal Treatment of Wood

A method for impregnating green wood with a water solution by sealing, one end of the wood with fine sand and forcing the liquid under pressure through the wood is described. The Process is known as the Slurry-Seal process. It is a modern adaptation of the Boucherie method of wood treating. Pilot plant equipment located at Spartanburg, S. C., is described. This equipment can be scaled up to normal wood treating capacities. This method of treatment speeds up the natural process of sap movement and provides preservative treated wood to conform to American Wood Preservers’ Association Standards. Treatment with a mixture of copper, chromium, and arsenic solution was used to illustrate the method. The pilot plant equipment is described in detail. Average retention of the CCA reported was 0.67 – 0.70 lb./cu.ft. Unpeeled or peeled wood can be used. Principal advantages claimed for the Slurry-Seal process are reduction of treating time, no boiler or steam is required, and no vacuum equipment is needed. The process works well only on green wood. It has been applied to southern yellow pine, red oak, red and black gum, and poplar.

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