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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados; Embrapa Pantanal. |
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Data corrente: |
05/05/1997 |
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Data da última atualização: |
05/05/1997 |
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Autoria: |
CHUDNOFF, M.; MALDONADO, E. D.; GOYTIA, E. |
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Título: |
Solar drying of tropical hardwoods. |
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Ano de publicação: |
1966 |
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Fonte/Imprenta: |
Rio Piedras: Institute of Tropical Forestry, 1966. |
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Páginas: |
26p |
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Série: |
(Research Paper, 2). |
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Idioma: |
Inglês |
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Conteúdo: |
The lumber solar dryer is a wood-framed structure covered with thin transparent materials that permit transmission of shortwave solar energy. Baffled fans provide air circulation. Air exchange is regulated using adjustable vents and mist sprayers permit some additional control of relative humidity. At Rio Piedras-San Juan, temperature, relative humidity, and solar radiation are fairly uniform throughout the year, being slightly more favorable for rapid lumber drying during february-march. Solar and air drying time of seven charges of Honduras mahogany of varying thicknesses and one mixed charge of 11 hardwood species has been determined. From an initial green moisture content of 50 percent, l-inch mahogany can be solar dried to a final moisture content of 12 percent in 18 days, 1-1/4-inch requires 25 days, and 2-inch stock about 41 days. The mixed hardwoods (1-1/4-inch), ranging in basic specific gravity from 0.48 to 0.82 required 43 days to solar-dry from an average green moisture content of 60 percent to a final average moisture content of 12 percent. At the end of the runs, moisture content of sample boards usually ranged +- 2 percent from this mean. A 48-hour mist spray conditioning treatment is adequate to remove severe casehardening. A moisture content of 15 percent can be reached in the solar dryer in one-half to one-fourth the time required for air drying. Nevertheless, warping and checking in the solar-dried lumber are no more severe than in matched air-dried material. MenosThe lumber solar dryer is a wood-framed structure covered with thin transparent materials that permit transmission of shortwave solar energy. Baffled fans provide air circulation. Air exchange is regulated using adjustable vents and mist sprayers permit some additional control of relative humidity. At Rio Piedras-San Juan, temperature, relative humidity, and solar radiation are fairly uniform throughout the year, being slightly more favorable for rapid lumber drying during february-march. Solar and air drying time of seven charges of Honduras mahogany of varying thicknesses and one mixed charge of 11 hardwood species has been determined. From an initial green moisture content of 50 percent, l-inch mahogany can be solar dried to a final moisture content of 12 percent in 18 days, 1-1/4-inch requires 25 days, and 2-inch stock about 41 days. The mixed hardwoods (1-1/4-inch), ranging in basic specific gravity from 0.48 to 0.82 required 43 days to solar-dry from an average green moisture content of 60 percent to a final average moisture content of 12 percent. At the end of the runs, moisture content of sample boards usually ranged +- 2 percent from this mean. A 48-hour mist spray conditioning treatment is adequate to remove severe casehardening. A moisture content of 15 percent can be reached in the solar dryer in one-half to one-fourth the time required for air drying. Nevertheless, warping and checking in the solar-dried lumber are no more severe than in matched air-dried materi... Mostrar Tudo |
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Palavras-Chave: |
Secadora solar. |
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Thesagro: |
Madeira; Secagem. |
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Thesaurus Nal: |
hardwood; solar drying. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02038nam a2200217 a 4500
001 1560892
005 1997-05-05
008 1966 bl uuuu u0uu1 u #d
100 1 $aCHUDNOFF, M.
245 $aSolar drying of tropical hardwoods.
260 $aRio Piedras: Institute of Tropical Forestry$c1966
300 $a26p
490 $a(Research Paper, 2).
520 $aThe lumber solar dryer is a wood-framed structure covered with thin transparent materials that permit transmission of shortwave solar energy. Baffled fans provide air circulation. Air exchange is regulated using adjustable vents and mist sprayers permit some additional control of relative humidity. At Rio Piedras-San Juan, temperature, relative humidity, and solar radiation are fairly uniform throughout the year, being slightly more favorable for rapid lumber drying during february-march. Solar and air drying time of seven charges of Honduras mahogany of varying thicknesses and one mixed charge of 11 hardwood species has been determined. From an initial green moisture content of 50 percent, l-inch mahogany can be solar dried to a final moisture content of 12 percent in 18 days, 1-1/4-inch requires 25 days, and 2-inch stock about 41 days. The mixed hardwoods (1-1/4-inch), ranging in basic specific gravity from 0.48 to 0.82 required 43 days to solar-dry from an average green moisture content of 60 percent to a final average moisture content of 12 percent. At the end of the runs, moisture content of sample boards usually ranged +- 2 percent from this mean. A 48-hour mist spray conditioning treatment is adequate to remove severe casehardening. A moisture content of 15 percent can be reached in the solar dryer in one-half to one-fourth the time required for air drying. Nevertheless, warping and checking in the solar-dried lumber are no more severe than in matched air-dried material.
650 $ahardwood
650 $asolar drying
650 $aMadeira
650 $aSecagem
653 $aSecadora solar
700 1 $aMALDONADO, E. D.
700 1 $aGOYTIA, E.
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Registro original: |
Embrapa Cerrados (CPAC) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Rondônia. |
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Data corrente: |
25/04/2024 |
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Data da última atualização: |
30/04/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BENTES-GAMA, M. de M.; SCOLFORO, J. R. S.; GAMA, J. R. V.; OLIVEIRA, A. D. |
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Afiliação: |
MICHELLINY PINHEIRO DE MATOS BENTES, CPAF-RO; JOSÉ ROBERTO SOARES SCOLFORO, UNIVERSIDADE FEDERAL DE LAVRAS; JOÃO RICARDO VASCONCELOS GAMA, UNIVERSIDADE FEDERAL DE VIÇOSA; ANTONIO DONIZETTE DE OLIVEIRA, UNIVERSIDADE FEDERAL DE VIÇOSA. |
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Título: |
Estrutura e valoração de uma Floresta de várzea alta na Amazônia. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Cerne, v. 8, n. 1, p. 88-102, 2002. |
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Idioma: |
Português |
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Palavras-Chave: |
Estuário amazônico; Floresta inundável. |
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Thesagro: |
Composição Botânica; Estrutura Vegetal; Estuário; Várzea. |
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Thesaurus NAL: |
Botanical composition. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00674naa a2200229 a 4500
001 2164010
005 2024-04-30
008 2002 bl uuuu u00u1 u #d
100 1 $aBENTES-GAMA, M. de M.
245 $aEstrutura e valoração de uma Floresta de várzea alta na Amazônia.$h[electronic resource]
260 $c2002
650 $aBotanical composition
650 $aComposição Botânica
650 $aEstrutura Vegetal
650 $aEstuário
650 $aVárzea
653 $aEstuário amazônico
653 $aFloresta inundável
700 1 $aSCOLFORO, J. R. S.
700 1 $aGAMA, J. R. V.
700 1 $aOLIVEIRA, A. D.
773 $tCerne$gv. 8, n. 1, p. 88-102, 2002.
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