Original paper(Vol.48 No.3 pp.218)
Deterrence of Irregular Staining Caused by Tylose Development in Partial Coloring of Beechwood Utilizing Selective Penetration
Arai Kazushige; Yata Shigeki
Abstract:For the development of the partial coloring technique using Japanese beech (Fagus crenata), it is necessary to clarify the methods for prevention of tylose development.
Three logs felled in midsummer were immediately immersed in a hot bath at temperatures of 20 deg., 40 deg., 50 deg., 60 deg.. Another three logs felled in midwinter were each cut into 4 sections then treated in the following conditions; outdoors under snow, a stockroom well ventilated within -30.9 deg. - 11.3 deg., a thermostatic room at 4 deg., a stock room well ventilated within 1 deg. - 18 deg. for 90 days, and a half of each section was immediately immersed in a hot bath at a temperature of 50 deg.. Then, they were each penetrated with a dye solution by the capillary rise method for four hours.
Results obtained were as follows;
1. The wood felled in summer and treated in hot baths of 50 deg. and 60 deg. absorbed a dye solution very well. And as the dye solution penetrated into the wood deeply through the vessels of earlywood, color contrast between the earlywood and the latewood was emphasized clearly.
2. Wood felled in winter needs to be sawed and dried within a low temperature period. Or the wood needs to be heated above 50 deg. before drying.
Key Words:tylose development, heat treatment, partial coloring