A transverse compression technique enabled us to impregnate liquid into green timber through replacement of the free water in the timber with a treatment liquid without any critical physical damage to the timber by the roller-pressing method. The roller-pressing is supposed to remove free water the cell cavities and to concurrently introduce the treatment solution into green timber in the treatment vessel. This process seems applicable to the preservative treatment of timber without drying prior to the treatment, and definitely contributes to both the reduction of production costs and the greater yield of the products due to the occurrence of the fewer undesirable checks. When Cryptomeria japonica D. Don was treated with an aqueous solution of phenolic-resin according to this process, weight gain exceeded 40% and anti-swelling efficiency went up to over 60% even for 1 min immersion period after pressing. Further trials are planned to evaluate biological resistance of the treated timber when fungicide(s) and/or termiticide(s) are incorporated into the treatment solution(s).

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