Drying and impregnating for heavy timbers of Sugi heartwood. (1)
Effects of moisture content and incising on preservative penetration.

Abstract

For the purpose of establishing an impregnation procedure for heavy timbers from Sugi wood, the effects of moisture content and incising on preservative penetration were investigated.
With the decrease of moisture content of Sugi heartwood specimens, impregnation and penetration of wood preservative increased. However, only 1/2~2/3 specimens without incising passed the minimum requirement for preservative penetration of the JAS for sawn timber, though the moisture contents were about 20% . On the other hand, all incised specimens whose moisture contents were about 50% or less showed the penetration more than 90% , and passed the requirement of preservative penetration.