Pressure Band for Sap Displacement of Freshly Felled Trees Using Waterborne Preservatives

A light-weight pressure band for the sap-displacement of freshly felled timber is described. Sap was displaced from a 2m length of freshly felled Sitka spruce, using copper-chrome-arsenate preservative, in 15 minutes at a pressure of 0.69 MPa (100 lb. ft. in.2). The maximum pressure attained with the band was 0.97 MPa (140 lb. ft. in.2). Trees of diameters 15 to 30 cm can be treated. A chain saw was used to cut a 1 cm slot around the tree 10 cm from the butt end. The slot penetrated the sapwood completely but left a diameter of 5 cm intact. The band was located in the slot and fastened with buckles. The delay between felling and treating is reported to be less than with conventional pressure methods. The band is considered light enough to enable treatment to be carried out by one man. A typical treatment is illustrated and a diagram of the band provided.

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