Behavior of Juvenile and Mature Eucalyptus cloeziana Wood Subjected to Drastic Drying

Soares, Bruno Charles Dias; Lima, José Tarcísio; Rocha, Maria Fernanda Vieira; Araújo, Ana Clara Caxito de; Veiga, Tais Regina Lima Abreu

doi:10.1590/2179-8087.087217

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…From the saturation point of the wood fibers until close to 0 % moisture, the output of the adsorbed water was practically the same in the wood of the two clones. The drying curves of both clones showed an exponential trend, as found in studies performed with drastic drying (Barbosa et al 2005, Soares et al 2016, Soares et al 2019.…”

Section: Initial Moisture Content and Basic Densitysupporting

confidence: 70%

“…Drying schedules have been developed by various authors using this method (Barbosa et al 2005, Ofori and Brentuo 2010, Klitzke and Batista 2010, Batista and Klitzke 2012, Batista et al 2015, Jankowsky et al 2012, Effah and Cofi 2014, Eleotério et al 2015, Soares et al 2016, Soares et al 2019. Those studies confirmed that developed drying schedules shortens times and reduces overall work.…”

Section: Introductionmentioning

confidence: 89%

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Changing the calculated surface area of wood samples to define drying schedules for Eucalyptus clones

Maria

Calegário

Soares

et al. 2022

Maderas, Cienc. tecnol.

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The aim of this study was to determine how varying the inputted surface area value of wood samples would affect the determination of kiln-drying schedules using the drastic drying test. For this purpose, eight individuals of two Eucalyptus clones were selected. Specimens were obtained for drastic drying tests at 100 °C, to measure the basic density and to determine the initial moisture content. The initial and final temperatures and the drying potential were calculated in 100 mm × 50 mm × 10 mm samples, considering the surface area to be 130 cm² (Updated Method), in contrast to the surface area of 100 cm² that is commonly used in the method known as the Standard Method. Based on these findings, kiln-drying schedules were set for the lumber from each clone. Although the significant differences aforementioned, it was observed that the drying schedules developed by Standard Method and Updated Method are similar.

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Section: Initial Moisture Content and Basic Densitysupporting

confidence: 70%

Section: Introductionmentioning

confidence: 89%

Changing the calculated surface area of wood samples to define drying schedules for Eucalyptus clones

Maria

Calegário

Soares

et al. 2022

Maderas, Cienc. tecnol.

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“…Valenzuela et al (2012a) analyzed the checks and characteristics of the vessels in 12-year-old E. nitens wood samples and found a higher vessels diameter and higher average area of vessels in the wood with a higher percentage of checks. Soares et al (2019), studying the juvenile wood and the mature wood of E. cloeziana at the age of 37 years, stated that the lower vessel frequency and higher vessel diameter found in mature wood were associated with a lower occurrence of end checks.…”

Section: Introductionmentioning

confidence: 99%

Relationship between vessel parameters and cleavage associated with checking in Eucalyptus grandis wood

Soares

Lima²,

Silva

2021

Maderas, Cienc. tecnol.

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In this work, the relationship between vessels parameters and the wood cleavage strength were studied to clarify the process of formation of this type of check, very common in Eucalyptus wood. The objective was to identify the relationship between the wood cleavage strength, the average area of the vessel, and the percentage area of vessels on the wood transverse surface. For this, two Eucalyptus grandis trees at 22 years old were felled and specimens for the cleavage test were produced to determine the wood cleavage strength. From these specimens, samples were taken to determine the average area of the vessel and the percentage area of vessels, aiming at adjusting mathematical models that explain the variation in the cleavage strength. The results showed that the higher the average area of the vessel and the percentage of area occupied by vessels in the wood, the lower its cleavage strength. The multiple linear regression model can estimate the cleavage strength as a function of the average area of the vessel, and the percentage area of the vessels.

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How thermal treatment affects the chemical composition and the physical, mechanical and swelling properties of Scots pine juvenile and mature wood

Broda,

Popescu,

Poszwa

et al. 2024

Wood Sci Technol

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High variations in juvenile wood properties in the radial direction and its worse performance than mature wood make it less suitable for some applications and often treated as waste material. This study aimed to assess how thermal modification affects the chemical composition and the physical, mechanical and swelling properties of Scots pine juvenile and mature wood. An additional goal was to evaluate if the modification can equalise the differences in selected properties of juvenile wood to those of mature wood so that from waste material, juvenile wood can become a fully-fledged raw material for various industrial applications. Thermal treatment at 220 °C influenced wood chemical composition, degrading mainly hemicelluloses but also affecting cellulose and lignin, which resulted in a reduction of hydroxyls and carbonyl/carboxyl groups. These changes were more pronounced for mature than juvenile wood. It reduced mass loss and swelling rate, and increased swelling pressure in the tangential and radial directions to a higher degree for juvenile than mature wood. Changes in mechanical properties in compression were statistically significant only for mature wood, while wood hardness remained unaffected. Although the applied heat treatment improved the performance of juvenile wood by reducing its swelling rate, it did not equalise the examined properties between juvenile and mature wood. Since higher juvenile wood proportion is expected in the wood supply from the future intensively managed forests, there is still a need to find suitable modification methods or better processing techniques so that instead of being thrown away as waste, it could be used broadly in various industrial applications.

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Behavior of Juvenile and Mature Eucalyptus cloeziana Wood Subjected to Drastic Drying

Cited by 3 publications

References 12 publications

Changing the calculated surface area of wood samples to define drying schedules for Eucalyptus clones

Changing the calculated surface area of wood samples to define drying schedules for Eucalyptus clones

Relationship between vessel parameters and cleavage associated with checking in Eucalyptus grandis wood

How thermal treatment affects the chemical composition and the physical, mechanical and swelling properties of Scots pine juvenile and mature wood

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