An improved high pressure sap displacement (HPSD) method for treating poles
1981
Siriban, F.R. (Forest Products Research and Industries Development Commission, College, Laguna (Philippines))
The main problem in the practical application of the high pressure sap displacement (HPSD) impregnation has been in devising a satisfactory cap that must be easily fitted to different sizes of log ends and tolerable eccentricities to give a leak-proof seal. This paper describes a new type of cap and sealing system designed to meet these requirements. Results of test on 15 mahogany (Swietenia macrophylla King) poles indicated that the system of operation is workable and that an adequate retention of preservative could be obtained in the treatable sapwood that will control decay and insect attack under tropical conditions. With regards to the present results as well as to those obtained by previous workers, it is considered on technical and economic grounds that HPSD techniques generally offer a suitable means of timber impregnation
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