Why does oil-based preservative enable penetration into poorly permeable Larch wood?

2019 Fiscal Year Final Research Report

• Project/Area Number: 19K21159
• Project/Area Number (Other): 18H06020 (2018)
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund (2019); Single-year Grants (2018)
• Review Section: 0603:Forestry and forest products science, applied aquatic science, and related fields
• Research Institution: Hokkaido Research Organization
• Principal Investigator: SHIBUI Hiromi 地方独立行政法人北海道立総合研究機構, 森林研究本部 林産試験場, 研究職員 (50825932)
• Project Period (FY): 2018-08-24 – 2020-03-31
• Keywords: カラマツ / 油溶性薬剤 / 浸透性 / 樹脂道 / 壁孔

Outline of Final Research Achievements

To clarify why the highly permeable oil-based preservative can penetrate deeply into the hard-to-permeate larch wood, the permeation route of the oil-based preservative in the tissue of the larch wood and the effects of the state (opening and closing) of bordered pit on the penetration were investigated. The oil-based preservative penetrated various tissues including the tracheid and the ray tissue. The resin canal filled with the resin having a high affinity for the oil-based preservative was thought to contribute to its high penetration. The permeability of the oil-based preservative tended to increase when the pores were open in heartwood, but it was suggested that there are other factors that contribute to the permeability of the oil-based preservative in addition to the state of bordered pits.

Free Research Field

木材保存

Academic Significance and Societal Importance of the Research Achievements

高浸透性の油溶性薬剤が，難浸透性のカラマツ材でも高い浸透が得られる要因として，樹脂道ネットワークを通じて素早く移動することが明らかとなった。さらに，液体の浸透性に深く関わると言われてきた壁孔の開閉以外にも油溶性薬剤の浸透性に関わる要因が存在することが示唆された。本研究は，これまでほとんど調べられてこなかった油溶性薬剤の浸透性について木材解剖学的観点から新たに明らかにした点で学術的価値の高いものであり，保存処理が困難であったカラマツ材の用途拡大に向けた応用的価値の高いものである。