Qualidade da secagem de madeira serrada de &lt;i&gt;Eucalyptus dunnii. &lt;/i&gt;

Severo, Elias Taylor Durgante

doi:10.5902/19805098399

Cited by 19 publications

(18 citation statements)

References 2 publications

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“…Segundo Severo (2000), a principal razão para a secagem da madeira é assegurar-se de que a madeira seja dimensionalmente tão estável quanto possível antes do uso em uma estrutura ou item manufaturado. A maneira mais prática e barata de secar madeira é àquela ao ar livre.…”

Section: Introductionunclassified

Curva Característica de Secagem da Madeira de Tectona grandis e Acacia mangium ao Ar Livre

et al. 2015

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RESUMOA secagem natural é uma alternativa que pode ser empregada como pré-secagem ou secagem definitiva para diversas madeiras com baixo custo e condições simples de trabalho. O presente trabalho foi realizado com o objetivo de estudar o comportamento das curvas características de secagem ao ar livre de tábuas de Acacia mangium e Tectona grandis. Árvores de cada espécie com idade de 15 anos foram abatidas, com toras de aproximadamente 3 m. Essas foram desdobradas utilizando-se o sistema de cortes tangenciais para a obtenção das tábuas de 3,0 cm de espessura. Instalada a pilha de madeira para a secagem, a umidade inicial das amostras foi determinada e o acompanhamento foi realizado por meio de pesagens periódicas das amostras de controle. Observou-se que nas condições ambientais expostas, a madeira de Acacia mangium secou mais lentamente ao ar livre que a madeira de Tectona grandis. Recomenda-se a análise da curva de secagem para cada espécie separadamente.Palavras-chave: secagem natural, umidade, pilha de madeira. Characteristic Air Drying Curve for Tectona grandisand Acacia mangium Lumber ABSTRACTAir drying is a simple, low-cost alternative that can be used in the pre-drying or definitive drying of several woods. The objective of the present work was to study the behavior of the characteristic air drying curve for Acacia mangium and Tectona grandis lumber. Fifteen-year-old trees of each species were cut into logs of approximately 3 m in length. The logs were sawn using a tangential cut system to obtain 3 cm-thick boards. After the wood pile was mounted for drying, the moisture content of samples was determined, and monitoring occurred through the periodic weighing of the control samples. It was possible to observe that, under the environmental conditions imposed, Acacia mangium boards dried more slowly than Tectona grandis boards. A separate analysis of the drying curve for each species is recommended.

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Section: Introductionunclassified

Curva Característica de Secagem da Madeira de Tectona grandis e Acacia mangium ao Ar Livre

et al. 2015

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“…During drying, the superficial layers of boards are under tensile stress, while the center is under compression, causing superficial and end-crack and warping (CALONEGO; SEVERO, 2004SEVERO, , 2007SEVERO, 2000;SOUZA et al, 2012;VERMAAS, 1995).…”

Section: Severo E T D Et Almentioning

confidence: 99%

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

Severo

Tomaselli

Calonego

et al. 2013

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ABSTRACT:The aim of this study was to evaluate the effect of steam treatment prior to drying on the initial moisture content, moisture gradient, and drying rate in Eucalyptus dunnii Maiden wood. Boards were steamed at 100ºC for 3 h after 1 h of heating-up. Part of these boards was dried in a drying electric oven at 50ºC, and part was dried at kiln. The results showed that the steaming prior to drying of wood: (1) significantly reduced by 9.2% the initial moisture content; (2) significantly increased by 6.2% the drying rate; (3) significantly decreased by 15.6 and 14.8% the moisture gradient between the outer layer and the center of boards and between the outer and intermediate layers of boards, respectively. Steamed boards when dried in an oven showed drying rate of 0.007065 whereas in kiln were 0.008200 and 0.034300 from green to 17 and 17 to 12% moisture content, respectively. It was demonstrated that the steaming prior to drying can be suitable for reduces the drying times of this kind of wood.

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“…The wood freezing (WF) was carried out in a conventional freezer without air circulation. After this stage, all the samples were dried at 40 °C in an oven with forced air circulation, and the moisture content of the samples was monitored using the methodology described by Severo (2000). The heat treatment (WT) was performed in the same oven with forced air circulation.…”

Section: Two-stage Freeze-heat Treatmentsmentioning

confidence: 99%

Physical and Mechanical Properties of Fast-Growing Wood Subjected to Freeze-Heat Treatments

et al. 2016

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The physical and mechanical performance of wood from the rose gum (Eucalyptus grandis) and the Gympie messmate (Eucalyptus cloeziana) species were investigated. The wood samples were treated with a twostage freeze-heat thermal process. Fast-growing trees were used for preparing test samples, which were subjected to thermal treatments. The freezing stage had the treatment temperature fixed at -22 °C for 72 h, while the temperature of the heat stage ranged from 180 to 200 °C for 3.5 h. The measurements of mass loss, density, and equilibrium moisture content were determined to better understand the mechanical properties. Static bending, compression parallel to grain, Janka hardness, and impact tests were applied to reveal changes in the mechanical behavior of the treated wood. In general, the freezing stage decreased the mass loss and increased the moisture content of wood (when combined with the heating stage), which showed the opposite trend for the heating stage. Modulus of elasticity and compression strength were increased only after the heating stage, while decrements were found for modulus of rupture, impact strength, and Janka hardness. The two-stage treatments did not prevent a decrease in the mechanical properties; however, they were helpful in preventing higher mechanical resistance losses in hardness (the Gympie messmate) and impact resistance (the rose gum).

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Qualidade da secagem de madeira serrada de <i>Eucalyptus dunnii. </i>

Cited by 19 publications

References 2 publications

Curva Característica de Secagem da Madeira de Tectona grandis e Acacia mangium ao Ar Livre

Curva Característica de Secagem da Madeira de Tectona grandis e Acacia mangium ao Ar Livre

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

Physical and Mechanical Properties of Fast-Growing Wood Subjected to Freeze-Heat Treatments

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