Microstructural aspects of thermally modified Eucalyptus grandis wood

Batista, Djeison César; Paes, Juarez Benigno; Muñiz, Graciela Inés Bolzón de; Nisgoski, Silvana; Oliveira, José Tarcísio da Silva

doi:10.4067/s0718-221x2015005000047

Cited by 18 publications

(18 citation statements)

References 8 publications

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“…VAP HolzSysteme ® is typically divided in five phases, which lengths approximately eight hours, with some more eight hours of cooling. The exact schedule is proprietary information, but a more detailed description of the process can be found in Batista et al (2015).…”

Section: Wood Materials and Thermal Modificationmentioning

confidence: 99%

“…Nevertheless, its research with other species is continuing and the first paper published about this Brazilian process of thermal modification studied Eucalyptus grandis juvenile wood anatomy (Batista et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…This study is a continuing of Batista et al (2015) and its aim was to evaluate the effect of the VAP HolzSysteme ® process on the chemical composition of Eucalyptus grandis juvenile wood.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Brazilian thermal modification process on the chemical composition of Eucalyptus grandis juvenile wood: Part 1: Cell wall polymers and extractives contents

Batista

Muñiz

Oliveira

et al. 2016

Maderas, Cienc. tecnol.

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This article reports the first study of the influence of the Brazilian process of thermal modification called VAP HolzSysteme ® on the chemical composition of Eucalyptus wood. Flatsawn boards of Eucalyptus grandis juvenile wood were tested for four treatment levels: untreated and thermally modified at final cycle temperatures of 140, 160 and 180 °C. Chemical analyses were carried out according to the standards of the Technical Association of the Pulp and Paper Industry and encompassed total extractives, insoluble lignin, holocellulose (cellulose + hemicelluloses) and solvent soluble extractives in water (cold and hot) and ethanol:toluene (1:2 v.v.) mixture. The chemical composition of thermally modified Eucalyptus grandis juvenile wood was significantly changed by the VAP HolzSysteme ® process compared to untreated wood. Only the wood thermally modified at final cycle temperature of 180 °C was significantly different for all the chemical analyses performed compared to untreated wood.

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Section: Wood Materials and Thermal Modificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the Brazilian thermal modification process on the chemical composition of Eucalyptus grandis juvenile wood: Part 1: Cell wall polymers and extractives contents

Batista

Muñiz

Oliveira

et al. 2016

Maderas, Cienc. tecnol.

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“…For each of the evaluated species (Eucalyptus grandis and Pinus taeda), control pieces without any heat treatment applications were used, and pieces obtained from two thermal modification temperatures (140 and 160 °C) with a total cycle of eight hours, according to thermal modification program described by Batista et al (2015).…”

Section: Heat Treatmentmentioning

confidence: 99%

Effect of thermal modification in the natural resistance of Eucalyptus grandis and Pinus taeda woods

Carvalho

Juizo

França

et al. 2019

Agraria

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The aim of the study was to evaluate the natural durability of wood submitted to heat treatments and exposed in a field environment. Were used Eucalyptus grandis and Pinus taeda species, being selected five trees selected for each species studied, which were unfolded, dried in a conventional drying kiln, and later submitted to the heat treatments using temperatures of 140 and 160 ºC. Subsequently 75 specimens of each species were prepared, which were tested in the field during six months of exposure, and the evaluations of the samples occurring every 40 days. The evaluation included the analysis of climatic variables, potential of fungal attack and the mass loss (%) of the woods, being the statistical analysis of the data by ANOVA for mass loss (%), in a completely randomized design with triple factorial arrangement, for the factor specie in two levels, factor thermal treatment in tree levels (control, 140 and 160 ºC) and time of exposure in five levels (40, 80, 120, 160 and 200 days of exposure). Eucalyptus and pine treated at 160 ºC presented respectively the highest and lowest resistance to mass loss. All woods are classified by the average values as very resistant.Efeito da modificação térmica na resistência natural da madeira Eucalyptus grandis e Pinus taeda RESUMO: O objetivo do estudo foi avaliar a durabilidade natural de madeiras submetidas a tratamentos térmicos e expostas em ambiente de campo. Foram utilizadas madeiras das espécies Eucalyptus grandis e Pinus taeda, sendo selecionadas cinco árvores para cada espécie, as quais foram desdobradas, secas em câmara de secagem convencional e submetidas à modificação térmica utilizando temperaturas de 140 e 160 ºC. Posteriormente foram confeccionados 75 corpos de prova de cada espécie, expostos em campo durante seis meses, e as avaliações ocorrendo a cada 40 dias. Procedeu-se com a análise de variáveis climáticas, potencial de ataque fúngico e a perda de massa (%) das madeiras, sendo a análise estatística dos dados em ANOVA para a perda de massa (%), em delineamento inteiramente ao acaso com arranjo fatorial triplo para o fator espécie em dois níveis, fator tratamento térmico em três níveis (testemunha, 140 e 160 ºC) e fator tempo de exposição em cinco níveis (40; 80; 120; 160 e 200 dias de exposição). O eucalipto e o pinus tratados a 160 ºC apresentaram, respectivamente, a maior e a menor resistência a perda de massa. Todas as madeiras são classificadas pelos valores médios como muito resistentes. Palavras-chave: biodeterioração da madeira; perda de massa; tratamento térmicoEffect of thermal modification in the natural resistance of Eucalyptus grandis and Pinus taeda woods Rev. Bras.

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“…VAP HolzSysteme ® process is typically divided in five phases, which lengths approximately eight hours, with an extra phase of cooling, which also lengths about eight hours. The exact schedule is proprietary information, but a more detailed description of the process was provided by Batista et al (2015).…”

Section: Wood Materials and Thermal Modificationmentioning

confidence: 99%

Effect of the Brazilian thermal modification process on the chemical composition of Eucalyptus grandis juvenile wood: Part 2: Solubility and ash content

Batista

Muñiz

Oliveira

et al. 2016

Maderas, Cienc. tecnol.

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This article reports continuation of a study of the influence of the Brazilian process of thermal modification called VAP HolzSysteme ® on the chemical composition of eucalyptus wood. Flatsawn boards of Eucalyptus grandis juvenile wood were tested for four treatment levels: untreated, and thermally modified at final cycle temperatures of 140 °C, 160 °C or 180 °C. Chemical analyses were carried out according to the standards of the Technical Association of the Pulp and Paper Industry and encompassed 1% NaOH solubility and ash content. The 1% NaOH solubility increased in the wood thermally modified at 140 °C and 160 °C in relation to the untreated wood, but did not increase further 180 °C, indicating that the treatment at 180 °C was not enough to cause more degradation of hemicelluloses. In practice, the thermal modification process had no effect on the ash content of wood. The statistical difference observed between the treatment levels untreated and 160°C (0,04 percentage points) can be attributed to the heterogeneity of wood as a material.

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Microstructural aspects of thermally modified Eucalyptus grandis wood

Cited by 18 publications

References 8 publications

Effect of the Brazilian thermal modification process on the chemical composition of Eucalyptus grandis juvenile wood: Part 1: Cell wall polymers and extractives contents

Effect of the Brazilian thermal modification process on the chemical composition of Eucalyptus grandis juvenile wood: Part 1: Cell wall polymers and extractives contents

Effect of thermal modification in the natural resistance of Eucalyptus grandis and Pinus taeda woods

Effect of the Brazilian thermal modification process on the chemical composition of Eucalyptus grandis juvenile wood: Part 2: Solubility and ash content

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