| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently charge inorganic fine particles to the vicinity of a core of a timber to be treated without using a drum by opening wall holes of cells of the timber, then charging dispersion of the particles in the timber and drying it. SOLUTION: After a timber to be treated is previously barked, the timber is lumbered without finishing allowance as a green timber remains as it is. The lumbers are stuck in a pretreating unit 1, an inner kiln 2 is sealed, initially cooked with a saturated steam of a predetermined temperature and a pressure to soften timber cells, and moistures in the cells are evaporated and vaporized. Then, a combustion gas amount to an outer kiln 3 is regulated while exhausting the steam in the kiln 2 to set a predetermined superheated steam atmosphere in the kiln 2 to rush wall holes of the timber cells to be opened. After the treatment, the timer is dried by a dryer to several % of a content moisture, and transferred to a mineral charging kiln. The charging kiln is evacuated to a predetermined vacuum degree to remove containing air. Then, dispersion in which fine particles of silica or the like are separately readily mixed in a colloidal state is fed, pressurized, charged and dried. Thus, inorganic film particles can be charged to a core of the timer without using a drug.
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