Effect of Incising on Penetration of Creosote in Japanese Cedar Poles

Experiments with incising Japanese cedar poles to improve penetration of preservatives are described. The process had not been practiced in Japan and the studies were motivated by failures due to decay observed in spite of as much treatment as 10 pounds of creosote per cubic foot. The studies included observation of tangential penetration through natural checks and of longitudinal penetration through spiral saw cuts made on the poles. Results obtained were used to determine desirable patterns of incisions. Poles prepared with such patterns of incisions were studied for depth and distribution of penetration and subsequently for strength. Other parameters included in the experiments were: seasoning (air and artificial) and various treatment processes. For artificial seasoning methods the steam and vacuum and the boiling under vacuum methods were used. Creosoting was carried out with the empty-cell and the full-cell processes. An incision pattern of 3/4-inch spacing across the grain and about 19 inches along the grain was found to be desirable.

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