• Title/Summary/Keyword: USDA schedule

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Development of Kiln-Drying Schedules for Neolitsea sericea and Dendropanax morbifera Grown in Jeju Island (제주산 참식나무와 황칠나무의 건조스케줄 개발)

  • 김수원;정성호;정두진;박병수;강호양
    • Journal of the Korea Furniture Society
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    • v.14 no.2
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    • pp.13-20
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    • 2003
  • This research is to develop kiln-drying schedules for 2.7 mm thick boards of Neolitsea sericea and Dendropanax morbifera, which grow in the southern region of Korean Peninsula. These two species are lesser-known to woodcraft industry in this country. The proper USDA drying schedules for Neolitsea sericea and Dendropanax morbifera were found to be T10-C6 and T10-E6, respectively, by using the Quick Oven-drying Method. The boards dried in a kiln with the newly-developed schedules were revealed to be free from warping and checking.

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Development of a Kiln Dry Schedule for Lindera erythrocarpa Grown in Hongsung, Chungnam Province, Korea (충남 홍성지역에서 자란 비목나무(Lindera erythrocarpa)의 열기건조스케쥴 개발)

  • Kang, Chun-Won;Kang, Ho-Yang
    • Journal of the Korean Wood Science and Technology
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    • v.46 no.1
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    • pp.10-16
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    • 2018
  • Lindera erythrocarpa is a less utilized species in Korea although that it has straight stem and it grows up to 40 cm in diameter. A proper kiln-dry schedule is required in advance to utilize an unknown species. Terazwa's quick oven-dry method was used to find it and which was confirmed by drying 25 mm thick boards in a kiln. The average green moisture content and the average green specific gravity of Lindera erythrocarpa are 72.3% and 0.53, respectively. Prospective kiln-drying conditions obtained by Terazwa's quick oven-dry method are a initial dry-bulb temperature of $50^{\circ}C$, a initial wet-bulb depression of $4^{\circ}C$ and a final dry-bulb temperature of $75^{\circ}C$, which are in a good agreement with USDA FPL kiln-dry schedule of T5-D4. 25 mm thick boards dried in a kiln with T5-D4 kiln-dry schedule did not have any severe drying defects such as honycombing and warping. A severer kiln-dry schedule of T8-C5 was developed and applied to another kiln-drying run to confirm it.

Air-and Kiln-Drying the Boards and Disk of Quercus variabilis (굴참나무 판재와 원판의 천연건조와 열기건조)

  • Kang, Ho-Yang;Kim, Su-Won
    • Journal of the Korean Wood Science and Technology
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    • v.32 no.1
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    • pp.52-58
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    • 2004
  • Oak is one of major species in this country as well as pine, but has been less utilized because of its refractory properties. The purpose of this study is to develope an effective method for drying the boards and disks of Quercus variabilis. Among four end-coaters used in this study thick coating with polyvinyl acetate chrolide glue (PVAc) was proved as the most effective. The average air-drying rate of boards was 1.2%MC/day, which did not exceed the safe drying rate recommended by United States Department of Agriculture (USDA). The kiln drying schedule used in this study gave a good result in drying the air-dried boards to 8%MC without any internal checks. An attempt to prevent oak disks from V-cracking during air-drying using special pallet-type stickers was not successful.