| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Florestas. |
|
Data corrente: |
06/06/1995 |
|
Data da última atualização: |
16/03/2009 |
|
Autoria: |
FOELKEL, C. E. B. |
|
Título: |
Unbleached kraft pulp properties of some the brazilian and U.S. Pines. |
|
Ano de publicação: |
1973 |
|
Fonte/Imprenta: |
1973. |
|
Páginas: |
192 f. |
|
Idioma: |
Inglês |
|
Notas: |
Thesis (Master of Science) - State University of New York College of Environmental Science and Forestry, Syracuse, New York. |
|
Conteúdo: |
The purpose of this work was to compare wood characteristics and properties of the pulps obtained from several wood species, four of them growing in Brazil and two in the U.S.A. The four Brazilian pulp woods, namely Araucaria angustifolia, Pinus elliottii var. elliottii, Pinus taeda and Pinus caribaea var. hondurensis, were sampled, analyzed, pulped and tested in that country. The two American pulpwoods, Pinus elliottii var. elliottii (slash pine) and Pinus taeda (loblolly pine) studied in the U.S.A. Fiber measurements, chemical analyses and specific gravity determinations were performed on all samples. The three species of The three species of the genus Pinus from Brazil were young thinned woods and had a large juvenile wood component. The woods were pulped by the kraft process to two different intervals of permanganate number: 16 to 18 and 25 to 30. The objective was to compare pulps of equivalent lignin contents in each interval. The young Brazilian pinewoods were characterized by short fibers, low specific gravity and cellulose content, and high pentosan content. Araucaria angustifolia turned out to have long thick-walled fibers, high specifc gravity and cellulose content, and some what low alcohol benzene solubility and lignin content. The wood of the American slsh pine had longer and thicker-walled fibers, higher specific gravity and lower pentosan content when compared to the wood of loblolly pine. The pulps obtained from Araucaria angustifolia showed high tear strength but low burst and tensile strength. However, the young Brazilian pinewoods produced pulps with relatively high tensile and burst strength. Tear strength was low for Pinus elliottii and Pinus caribaea but high for Pinus taeda. Pinus caribaea pulps had high breaking length and burst factor and required a longer beating time to achieve a given handsheet density. Thesame trend regarding beating time was observed for Araucaria angustifolia pulps. Short-fibered species produced pulps with higher percentage stretch. The main objection to use of the pulps obtained from the young thinned Brazilian woods was the low pulp yield. This important feature leads to an economic problem in using these woods for manufacturing some grades of paper. However, this work demonstrates that kraft pulps from these woods have acceptable strength properties. If wood shortages become more severe, they may be used. The two American southern pine species which were studied gave very strong pulps, but low yields. Comparing the two species, slash pine pulps had higher, breaking lengths and burst factors, while loblolly pine pulps showed higher tear strength and were more easily refined. The effect of K Number on properties and interaction between species and K Number were also successfuly isolated and anlyzed. For all species, pulp yields, beating time and burst factor increased signicantly as a consequece of the increase in the K Number in the ranges which were studied, but the tear factor decreased. Among the Brazilian raw materials, significant effects of interaction between species and K Number were found for total yield (percent of oven- dry wood), beating time and breaking length. For the American woods , these effects were reported for screened yield (percent of oven-dry wood), breaking length and burst factor. MenosThe purpose of this work was to compare wood characteristics and properties of the pulps obtained from several wood species, four of them growing in Brazil and two in the U.S.A. The four Brazilian pulp woods, namely Araucaria angustifolia, Pinus elliottii var. elliottii, Pinus taeda and Pinus caribaea var. hondurensis, were sampled, analyzed, pulped and tested in that country. The two American pulpwoods, Pinus elliottii var. elliottii (slash pine) and Pinus taeda (loblolly pine) studied in the U.S.A. Fiber measurements, chemical analyses and specific gravity determinations were performed on all samples. The three species of The three species of the genus Pinus from Brazil were young thinned woods and had a large juvenile wood component. The woods were pulped by the kraft process to two different intervals of permanganate number: 16 to 18 and 25 to 30. The objective was to compare pulps of equivalent lignin contents in each interval. The young Brazilian pinewoods were characterized by short fibers, low specific gravity and cellulose content, and high pentosan content. Araucaria angustifolia turned out to have long thick-walled fibers, high specifc gravity and cellulose content, and some what low alcohol benzene solubility and lignin content. The wood of the American slsh pine had longer and thicker-walled fibers, higher specific gravity and lower pentosan content when compared to the wood of loblolly pine. The pulps obtained from Araucaria angustifolia showed high tear streng... Mostrar Tudo |
|
Palavras-Chave: |
Propriedade. |
|
Thesagro: |
Polpa. |
|
Thesaurus Nal: |
Pinus. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 03841nam a2200169 a 4500
001 1305513
005 2009-03-16
008 1973 bl uuuu m 00u1 u #d
100 1 $aFOELKEL, C. E. B.
245 $aUnbleached kraft pulp properties of some the brazilian and U.S. Pines.
260 $a1973.$c1973
300 $a192 f.
500 $aThesis (Master of Science) - State University of New York College of Environmental Science and Forestry, Syracuse, New York.
520 $aThe purpose of this work was to compare wood characteristics and properties of the pulps obtained from several wood species, four of them growing in Brazil and two in the U.S.A. The four Brazilian pulp woods, namely Araucaria angustifolia, Pinus elliottii var. elliottii, Pinus taeda and Pinus caribaea var. hondurensis, were sampled, analyzed, pulped and tested in that country. The two American pulpwoods, Pinus elliottii var. elliottii (slash pine) and Pinus taeda (loblolly pine) studied in the U.S.A. Fiber measurements, chemical analyses and specific gravity determinations were performed on all samples. The three species of The three species of the genus Pinus from Brazil were young thinned woods and had a large juvenile wood component. The woods were pulped by the kraft process to two different intervals of permanganate number: 16 to 18 and 25 to 30. The objective was to compare pulps of equivalent lignin contents in each interval. The young Brazilian pinewoods were characterized by short fibers, low specific gravity and cellulose content, and high pentosan content. Araucaria angustifolia turned out to have long thick-walled fibers, high specifc gravity and cellulose content, and some what low alcohol benzene solubility and lignin content. The wood of the American slsh pine had longer and thicker-walled fibers, higher specific gravity and lower pentosan content when compared to the wood of loblolly pine. The pulps obtained from Araucaria angustifolia showed high tear strength but low burst and tensile strength. However, the young Brazilian pinewoods produced pulps with relatively high tensile and burst strength. Tear strength was low for Pinus elliottii and Pinus caribaea but high for Pinus taeda. Pinus caribaea pulps had high breaking length and burst factor and required a longer beating time to achieve a given handsheet density. Thesame trend regarding beating time was observed for Araucaria angustifolia pulps. Short-fibered species produced pulps with higher percentage stretch. The main objection to use of the pulps obtained from the young thinned Brazilian woods was the low pulp yield. This important feature leads to an economic problem in using these woods for manufacturing some grades of paper. However, this work demonstrates that kraft pulps from these woods have acceptable strength properties. If wood shortages become more severe, they may be used. The two American southern pine species which were studied gave very strong pulps, but low yields. Comparing the two species, slash pine pulps had higher, breaking lengths and burst factors, while loblolly pine pulps showed higher tear strength and were more easily refined. The effect of K Number on properties and interaction between species and K Number were also successfuly isolated and anlyzed. For all species, pulp yields, beating time and burst factor increased signicantly as a consequece of the increase in the K Number in the ranges which were studied, but the tear factor decreased. Among the Brazilian raw materials, significant effects of interaction between species and K Number were found for total yield (percent of oven- dry wood), beating time and breaking length. For the American woods , these effects were reported for screened yield (percent of oven-dry wood), breaking length and burst factor.
650 $aPinus
650 $aPolpa
653 $aPropriedade
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Florestas (CNPF) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Semiárido. |
|
Data corrente: |
13/11/2023 |
|
Data da última atualização: |
13/11/2023 |
|
Tipo da produção científica: |
Artigo em Anais de Congresso |
|
Autoria: |
FEITOSA FILHO, J. C.; PINTO, J. M.; SILVA, D. J. |
|
Afiliação: |
JOSE CRISPINIANO FEITOSA FILHO, UFPB; JOSE MARIA PINTO, CPATSA; DAVI JOSE SILVA, CPATSA. |
|
Título: |
Efeitos da fertirrigação e da adubação convencional na salinidade e no pH dos solos em cultivos sob condições de ambiente protegido. |
|
Ano de publicação: |
2023 |
|
Fonte/Imprenta: |
In: INOVAGRI INTERNATIONAL MEETING, 8.; CONGRESSO BRASILEIRO DE IRRIGAÇÃO E DRENAGEM, 32., 2023, Fortaleza. Agricultura irrigada no Brasil e no mundo: tecnologias científicas de produção sustentável de alimentos. Brasília, DF: INOVAGRI: ABID, 2023. |
|
Idioma: |
Português |
|
Conteúdo: |
Esse trabalho teve como objetivo analisar níveis de salinidade e o pH do solo no momento antes do plantio e aos 30, 60 e 120 dias do ciclo cultural de Mini Melancia da Variedade Sugar Baby tutorada sob Fertirrigação comparada a mesma dose aplicada pela Adubação Convencional com 100% da dose recomendada. |
|
Palavras-Chave: |
Adubação convencional; Ambiente protegido; PH do Solo. |
|
Thesagro: |
Adubação; Fertirrigação; Irrigação; Salinidade; Solo. |
|
Thesaurus NAL: |
Fertigation; Salinity; Soil pH. |
|
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1158296/1/EFEITOS-DA-FERTIRRIGACAO-E-DA-ADUBACAO-CONVENCIONAL-2023.pdf
|
|
Marc: |
LEADER 01306nam a2200265 a 4500
001 2158296
005 2023-11-13
008 2023 bl uuuu u00u1 u #d
100 1 $aFEITOSA FILHO, J. C.
245 $aEfeitos da fertirrigação e da adubação convencional na salinidade e no pH dos solos em cultivos sob condições de ambiente protegido.$h[electronic resource]
260 $aIn: INOVAGRI INTERNATIONAL MEETING, 8.; CONGRESSO BRASILEIRO DE IRRIGAÇÃO E DRENAGEM, 32., 2023, Fortaleza. Agricultura irrigada no Brasil e no mundo: tecnologias científicas de produção sustentável de alimentos. Brasília, DF: INOVAGRI: ABID$c2023
520 $aEsse trabalho teve como objetivo analisar níveis de salinidade e o pH do solo no momento antes do plantio e aos 30, 60 e 120 dias do ciclo cultural de Mini Melancia da Variedade Sugar Baby tutorada sob Fertirrigação comparada a mesma dose aplicada pela Adubação Convencional com 100% da dose recomendada.
650 $aFertigation
650 $aSalinity
650 $aSoil pH
650 $aAdubação
650 $aFertirrigação
650 $aIrrigação
650 $aSalinidade
650 $aSolo
653 $aAdubação convencional
653 $aAmbiente protegido
653 $aPH do Solo
700 1 $aPINTO, J. M.
700 1 $aSILVA, D. J.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Semiárido (CPATSA) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
