Effect of steam thermal treatment on the drying process of Eucalyptus dunnii variables

Severo, Elias Taylor Durgante; Tomaselli, Ivan; Calonego, Fred Willians; Ferreira, André Luiz; Mendes, Lourival Marin

doi:10.1590/s0104-77602013000400014

Cited by 12 publications

(9 citation statements)

References 7 publications

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“…The water losses in the eucalyptus clones were higher during the first days of drying, similar to that reported for Eucalyptus urophylla logs (REZENDE et al, 2010;ZANUNCIO et al, 2013b) and Pinus radiata and Eucalyptus dunnii lumber (ANANIAS et al, 2013b;SEVERO et al, 2013). During this period, the loss of free water occurs because the weak capillary bonding between the wood and the water molecules gets easily broken, favoring water loss from the wood (KOLLMANN; CÔTÉ, 1968).…”

Section: Wood Dryingsupporting

confidence: 81%

RELATIONSHIP BETWEEN THE ANATOMY AND DRYING IN Eucalyptus grandis X Eucalyptus urophylla WOOD

et al. 2016

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-Drying is an important step to using wood and anatomical characteristics influence this process. Thus, the objective of this work was to evaluate the relationship between anatomy and wood drying. Samples with 2 x 2 x 4 cm were obtained from eight Eucalyptus urophylla x Eucalyptus grandis clones at 1.3 m height to evaluate the anatomy and drying in climate chamber during 15 days. Cell wall fraction was established as the parameter that best correlated with drying, the Pearson correlation coefficient between this parameter and moisture was -0.8986, -0.6580, 0.9216, 0.8743, 0.7131 and 0.8727 for saturated wood, and after 1, 2.5, 5, 10 and 15 days of drying, respectively. The frequency and vessel size, as well as the height and width of the rays showed low relation with wood drying. Wood anatomy, mainly the cell wall fraction, influences moisture losses and should be considered in wood drying programs.Keywords: Cell wall fraction; Eucalyptus; Moisture. RELAÇÃO ENTRE A ANATOMIA E A SECAGEM DA MADEIRA DE Eucalyptus grandis X Eucalyptus urophyllaRESUMO -A secagem é uma importante etapa para utilização da madeira e as características anatômicas influenciam neste processo. Desse modo, o objetivo foi avaliar a relação entre a anatomia e a secagem da madeira. Amostras de 2 x 2 x 4 cm de madeira foram retiradas de oito materiais de Eucalyptus grandis x Eucalyptus urophylla, a 1,3 metros acima do solo para avaliação da anatomia e secagem em câmara climática durante 15 dias. A perda de umidade foi maior nos primeiros dias de secagem e todos os materiais alcançaram a umidade de equilíbrio com 15 dias de secagem. A fração parede foi o parâmetro que melhor se relacionou com a secagem, sendo que o coeficiente de correlação de Pearson entre este parâmetro e a umidade foi de -0,8986; -0,6580; 0,9216; 0,8743; 0,7131 e 0,8727 para a madeira saturada e após 1; 2,5; 5; 10 e 15 dias de secagem, respectivamente. O diâmetro e a frequência de vaso e a altura e a largura dos raios mostraram baixa relação com a secagem. A anatomia, principalmente a fração parede, influenciou a perda de umidade e por isto, deve ser considerada na elaboração de programas de secagem da madeira.Palavras-chave: Eucalipto; Fração parede; Umidade. 724Revista Árvore, Viçosa-MG, v.40, n.4, p.723-729, 2016 ZANUNCIO, A.J. et al.

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Section: Wood Dryingsupporting

confidence: 81%

RELATIONSHIP BETWEEN THE ANATOMY AND DRYING IN Eucalyptus grandis X Eucalyptus urophylla WOOD

et al. 2016

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“…The moisture loss was higher for all the materials in the first drying periods, similar to that reported for E. urophylla logs (REZENDE et al, 2010;ZANUNCIO et al, 2013b) and Pinus radiata and Eucalyptus dunnii lumber (ANANIAS et al, 2013;SEVERO et al, 2013). At this stage, the timber has higher volume of free water that weakly interacts with wood and is easily removed, thus increasing the drying rate (ENGELUND et al, 2013).…”

Section: Wood Dryingsupporting

confidence: 80%

Artificial Neural Networks as a New Tool for Assessing and Monitoring Wood Moisture Content

et al. 2016

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-Drying of wood is necessary for its use and moisture control is important during this process. The aim of this study was to use artificial neural networks to evaluate and monitor the wood moisture content during drying. Wood samples of 2 × 2 × 4 cm were taken at 1.3 m above the ground, outside of radial direction, from seven 2-year-old materials and three 7-year-old materials. These samples were saturated and drying was evaluated until the equilibrium moisture content, then, the artificial neural networks were created. The materials with higher initial moisture reached equilibrium moisture content faster due to its higher drying rate. The basic density of all wood materials was inversely proportional at the beginning and directly proportional to the moisture at the end of drying. All artificial neural networks used in this work showed high accuracy to estimate the moisture, however, the neural network based on the basic density and drying days was the best. Therefore, artificial neural networks can be used to control the moisture content of wood during drying.Keywords: Eucalyptus urophylla × Eucalyptus grandis; Drying; Modeling.REDES NEURAIS ARTIFICIAIS COMO NOVA FERRAMENTA PARA AVALIAÇÃO E MONITORAMENTO DA UMIDADE DA MADEIRA RESUMO -A secagem da madeira é necessária para sua utilização e o controle da umidade é fundamental durante este processo. O objetivo deste trabalho foi utilizar redes neurais artificiais para avaliar e monitorar a umidade da madeira durante a secagem. Amostras de 2 x 2 x 4 cm foram retiradas a 1,3 metros acima do solo na parte externa no sentido radial de sete materiais de dois anos e três de sete anos de Eucalyptus urophylla x Eucalyptus grandis. Essas amostras foram saturadas e sua secagem avaliada até a umidade de equilíbrio, logo após, foram criadas as redes neurais artificiais. Os materiais com maior umidade inicial atingiram a umidade de equilíbrio mais rápido, devido a maior taxa de secagem. A densidade básica da madeira de todos os materiais foi inversamente proporcional no inicio e diretamente proporcional à umidade no final da secagem. A rede neural artificial baseada na densidade básica e nos dias de secagem apresentou alta precisão para avaliar e monitorar a umidade da madeira. Portanto, as redes neurais artificiais podem ser utilizadas para controle da umidade da madeira durante a secagem.Palavras-chave: Eucalyptus urophylla × Eucalyptus grandis; Modelagem; Secagem. 544Revista Árvore, Viçosa-MG, v.40, n.3, p.543-549, 2016 ZANUNCIO, A.J.V. et al.

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“…[4,6,7] Steaming wood is a technique that may alleviate the problems during the sawing and drying processes, and it is applied for a variety of other purposes, such as to reduce growth stress levels, [8][9][10] change color, improve the dimensional stability, [11][12][13][14] increase the permeability [15] and drying rate, and reduce the initial moisture content (IMC), moisture gradient, and drying defects. [1,3,13,14,[16][17][18][19] When steamed at 54°C, the H. brasiliensis logs produce boards with higher end-cracks, where 704 and 239 mm are in their respective central and peripheral boards, whereas the steamed logs at 92°C present a greater relief of growth stresses, as observed by the smaller difference between the cracks' length in the central (394 mm) and peripheral (165 mm) boards. [20] The drying process is the best way to add value to the lumber.…”

Section: Introductionmentioning

confidence: 99%

Drying behavior and decay resistance of rubberwood from steamed log and presteamed lumber

et al. 2018

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The objective of this study was to evaluate the effect of log steaming and steaming prior to drying singly and both treatments together on the drying behavior and decay resistance of Hevea brasiliensis wood (rubberwood). Logs with a diameter of 34.6 � 4.4 cm were used. Half of the logs were kept in their original condition, and the other half were steamed at 90°C for 36 h. Later, the logs were cut into flat sawn boards. Half of the boards were kept in their original condition, and the other half were presteamed at 90°C for 3 h after 1 h of heating-up. These boards were dried in a drying kiln. The drying defects, drying time, drying rate, and decay resistance of wood to the Pycnoporus sanguineus fungus were determined. The results showed that the steaming is not suitable for decreases in the time and the drying rates of this kind of wood, and it neither reduces the drying defects of boards. Furthermore, these treatments adversely affected the decay resistance of rubberwood to P. sanguineus fungi.

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Effect of steam thermal treatment on the drying process of Eucalyptus dunnii variables

Cited by 12 publications

References 7 publications

RELATIONSHIP BETWEEN THE ANATOMY AND DRYING IN Eucalyptus grandis X Eucalyptus urophylla WOOD

RELATIONSHIP BETWEEN THE ANATOMY AND DRYING IN Eucalyptus grandis X Eucalyptus urophylla WOOD

Artificial Neural Networks as a New Tool for Assessing and Monitoring Wood Moisture Content

Drying behavior and decay resistance of rubberwood from steamed log and presteamed lumber

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