The development of moisture and strain profiles during predrying of<i>Eucalyptus nitens</i>

Sepúlveda-Villarroel, Víctor; Pérez-Peña, Natalia; Salinas-Lira, Carlos; Salvo-Sepúlveda, Linette; Elustondo, Diego; Ananías, Rubén A.

doi:10.1080/07373937.2015.1060490

Cited by 11 publications

(5 citation statements)

References 27 publications

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“…Several studies have evaluated the water outlet of the Eucapyptus, mainly in lumber (Barbosa et al, 2005;Jankowsky & Santos, 2005;Klitzke & Batista, 2010;Sepulveda-Villarroel et al, 2015;Latorraca et al, 2015). Publications on the drying of Eucalyptus logs began in the 1980s, with studies of the effect of time on wood drying (Vital et al, 1985).…”

Section: Introductionmentioning

confidence: 99%

Water Flow Evaluation in Eucalyptus and Corymbia Short Logs

et al. 2018

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The aim of this study is to evaluate the free and adsorbed water flow in short logs of Eucalyptus urophylla and Corymbia citriodora clones. 40 cm long, short logs were extracted from the base of the trees. Three trees each of C. citriodora and E. urophylla (A and B clones) were used. 27 logs were debarked and dried to achieve stabilization of mass. Free water (FWFR), adsorbed water (AWFR) and total water (TWFR) flow rates, and basic density were calculated. FWFR was greater than TWFR, which was superior to AWFR. The B clone wood showed a higher FWFR value and a lower AWFR value when compared to the other materials. On the other hand, the A clone wood showed a higher TWFR than the other materials. The TWFR was inversely proportional to density.

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Section: Introductionmentioning

confidence: 99%

Water Flow Evaluation in Eucalyptus and Corymbia Short Logs

et al. 2018

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“…These growth rates result from climate conditions and investment in tree breeding and silviculture management (CAMPINHOS Jr, 1999;GONÇALVES et al, 2008). The wood from these crops is used for diverse purposes, such as panel production (BAL;BEKTAŞ, 2014), energy (ZANUNCIO et al, 2013a;ZANUNCIO et al, 2013b;ZANUNCIO et al, 2014), lumber (ANANIAS et al, 2014;SEPULVEDA-VILLARROEL et al, 2015;ANDRADE et al, 2016) and cellulose pulp (OKAN et al, 2015;BARBOSA et al, 2016). This generates jobs and taxes for the Brazilian economy, but wind damage may limit the performance of this segment.…”

Section: Introductionmentioning

confidence: 99%

PULP PRODUCED WITH WOOD FROM Eucalyptus TREES DAMAGED BY WIND

Zanuncio

Carvalho

Carneiro

et al. 2016

CERNE

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Wind may damage eucalyptus trees, especially 24 months after planting, which can reduce wood fiber quality and hinder pulp production. The objective of this study was to evaluate the use of these materials in mixtures with wood from seven-yearold trees to produce pulp. Bleached pulp was produced using 100, 95, 85, 75 and 0% wood from seven-year-old eucalyptus trees, related to cutting age. Wood from two-yearold trees, when trees are most susceptible to damage by wind, completed each treatment. A 5 cm thick disc was taken from breast height (1.3m) on each tree for anatomical and ultrastructural characterization. The seven-year-old wood had lower vessel frequency and fibers with a longer length, higher cell wall fraction, higher modulus of elasticity and hardness, and a lower microfibril angle. Pulp refining decreased the opacity and specific volume, increased air resistance and improved mechanical properties. The addition of two-year-old wood to produce pulp reduced the mechanical properties and opacity, and increased the air resistance of the paper. The proportion of two-year-old wood that can be used in pulp production varied with the clone, parameter, and refining level. However, the pulp produced with 5% wood from two-year-old trees and 95% wood from sevenyear-old trees was similar to that with 100% seven-year-old wood. Therefore, 5% twoyear-old wood can be used to produce pulp without quality losses. PRODUÇÃO DE POLPA CELULÓSICA COM MADEIRA DE ÁRVORES DEEucalyptus DANIFICADAS PELO VENTO RESUMO: Árvores de eucalipto de rápido crescimento podem ser danificadas por ventos, principalmente 24 meses após o plantio, mas a baixa qualidade das fibras dessa madeira dificulta a produção de polpa celulósica. O objetivo deste estudo foi avaliar a utilização destes materiais para a fabricação de polpa celulósica em misturas com madeira de árvores de sete anos de idade. Polpa celulósica branqueada foi produzida com 100, 95, 85, 75 e 0% de madeira de árvores de dois clones de Eucalyptus grandis x Eucalyptus urophylla com sete anos de idade, relacionada com a idade de corte. Madeira de árvores de dois anos de idade, mais susceptíveis a danos por ventos, foi utilizada para completar cada tratamento. Um disco de espessura de 5 cm foi retirado na altura do peito (1,3 m) em cada árvore para a caracterização anatômica e ultra-estrutural. As árvores com sete anos apresentaram maior frequência de vasos, fibras com maior comprimento, fração parede, módulo de elasticidade e dureza e menor ângulo microfibrilar. O refino nas polpas diminuiu a opacidade e o volume específico e aumentou a resistência a passagem do ar e as propriedades mecânicas. A adição de madeira de dois anos de idade na produção de polpa celulósica reduziu a resistência mecânica e opacidade e aumentou a resistência à passagem de ar. A proporção da madeira de dois anos de idade, que pode ser utilizado na produção de polpa celulósica variou com o clone, parâmetro avaliado e intensidade do refino. No entanto, a polpa celulósica produzida com 5% de madeira de do...

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“…There are several drying methods used in the wood industry, in which the conventional kiln drying has dominated in the drying of lumbers due to its low cost and wide adaptability [21,22]. Although it is difficult to dry the refractory Eucalyptus wood owing to their natural propensity to internal checking and collapse, some Eucalyptus wood have been dried successfully at the commercial level using conventional kiln drying [23]. The studies showed that relatively thin wood (<20 mm) can be dried with less internal checking and collapse if they are pre-treated by air drying from green to the fiber saturated point (FSP).…”

Section: Introductionmentioning

confidence: 99%

Effect of Samples Length on the Characteristics of Moisture Transfer and Shrinkage of Eucalyptus urophylla Wood during Conventional Drying

Liu

Zhou

et al. 2023

Forests

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Moisture transfer influences wood deformation and moisture content (MC) distribution during conventional drying of Eucalyptus urophylla wood. This study aims to investigate the effect of sample length (30, 100, and 200 mm) on moisture distribution and transfer in different directions and locations and on deformation of wood. The results showed that when the MC was above the fiber saturated point (FSP), the drying rate decreases exponentially with an increase of sample length; however, below the FSP, there was no obvious relationship between the drying rate and sample length and above the FSP, the moisture distribution was non-uniform along tangential, radial, and longitudinal directions and became even below the FSP, which was more significant in the middle location of wood. The greatest MC differences occurred between the surface and sub-central layers along the tangential and radial direction, which were between the end and sub-middle locations along the longitudinal direction. The effect of sample length on the MC distribution and MC differences along wood in the three directions depended on locations and the MC stage of wood; most of the free water and bound water transferred from the wood central to the ends along the longitudinal direction for three sets of samples. Bound water diffusion significantly slowed as the sample length exceeded 200 mm; sample length affects wood collapse and its recovery, but the drying rate has a lesser effect on collapse for samples with a length below 200 mm.

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The development of moisture and strain profiles during predrying ofEucalyptus nitens

Cited by 11 publications

References 27 publications

Water Flow Evaluation in Eucalyptus and Corymbia Short Logs

Water Flow Evaluation in Eucalyptus and Corymbia Short Logs

PULP PRODUCED WITH WOOD FROM Eucalyptus TREES DAMAGED BY WIND

Effect of Samples Length on the Characteristics of Moisture Transfer and Shrinkage of Eucalyptus urophylla Wood during Conventional Drying

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