Study on conservation of waterlogged wood using freeze-drying method with microwave heating

• Project/Area Number: 23300329
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Cultural property science
• Research Institution: (財)元興寺文化財研究所
• Principal Investigator: KAWAMOTO Kozo 公益財団法人元興寺文化財研究所, 研究部, 研究員 (10241267)
• Co-Investigator(Kenkyū-buntansha): UEDA Naomi (公財)元興寺文化財研究所, 研究部, 研究員 (10193806) ; OOKUNI Makiko (公財)元興寺文化財研究所, 研究部, 技師 (40250352)
• Co-Investigator(Renkei-kenkyūsha): NAKAMURA Hidemi 奈良工業高等専門学校, 物質化学工学科, 教授 (70198232) ; KIZAWA Naoko (公財)元興寺文化財研究所, 研究部, 研究員 (50270773)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000); Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2011: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
• Keywords: 文化財 / 出土木製品 / 保存処理 / 凍結乾燥法 / マイクロ波 / マイクロ波加熱 / クラック

Outline of Final Research Achievements

The microwave freeze dryer has been developed for waterlogged wood conservation. The equipment is a freeze dryer with the added capability of allowing microwave to applied in the drying chamber. The freeze dryer is capable of achieving an absolute pressure of 10Pa. The chamber size is φ900mm×1800mm. The microwave source is magnetron which has a frequency of 2.45±0.05GHz and a maximum output of 2kW.
Based on experiments of the microwave freeze drying, the microwave system generates heat within the waterlogged wood sample itself so that sublimation is accelerated. We found the potential of the microwave freeze drying to remove the water which remains in depth of waterlogged wood.

Research Products

• [Presentation] 出土木材のマイクロ波加熱凍結乾燥法による保存処理の研究3 (2014)
  • Author(s): 川本耕三，植田直見，山田哲也，中村秀美（奈良高専）
  • Organizer: 日本文化財科学会 第31回大会
  • Place of Presentation: 奈良教育大学（奈良）
  • Year and Date: 2014-07-05 – 2014-07-06
• [Presentation] 出土木材のマイクロ波加熱凍結乾燥法による保存処理の研究2 (2013)
  • Author(s): 川本耕三，植田直見，山田哲也，中村秀美（奈良高専）
  • Organizer: 日本文化財科学会 第３０回大会
  • Place of Presentation: 弘前大学（青森）
• [Presentation] 出土木材のマイクロ波加熱凍結乾燥法による保存処理の研究2 (2013)
  • Author(s): 川本耕三
  • Organizer: 日本文化財科学会
  • Place of Presentation: 弘前大学
• [Presentation] 出土木材のマイクロ波加熱凍結乾燥法による保存処理の研究1 (2012)
  • Author(s): 川本耕三
  • Organizer: 日本文化財科学会
  • Place of Presentation: 京都大学