The effects of heat treatment on some technological properties of Scots pine (Pinus sylvestris L.) wood

Korkut, Süleyman; Akgül, Mehmet; Dündar, Türker

doi:10.1016/j.biortech.2007.03.038

Cited by 108 publications

(71 citation statements)

References 9 publications

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“…Regarding the Gympie messmate wood, HL decreased by 22.3% (NF) and HT decreased by 26.9% (F) at 200 °C. Similar results have been observed in previous studies (Unsal et al 2003;Korkut et al 2008;Calonego et al 2012;Bakar et al 2013;Priadi and Hiziroglu 2013). The reduction of hardness was attributed to the decomposition of the hemicelluloses during the heating treatments.…”

Section: Mechanical Propertiessupporting

confidence: 91%

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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Section: Mechanical Propertiessupporting

confidence: 91%

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

et al. 2016

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“…The same initial increase was mentioned by Sundqvist et al (2006) and attributed to condensation reaction in lignin and cellulose. However this increase was not found by Korkut et al (2008) who studied heat-treated Scots pine wood and concluded that Janka hardness decreased with the increase in temperature and time of treatment. The same was reported by Korkut and Hiziroglu (2009) for hazelnut wood with a 60% reduction for Janka hardness.…”

Section: Janka Hardnessmentioning

confidence: 83%

“…Due to the treatment there is also a darkening of wood (Esteves et al 2007b) and a decrease of wettability (Pecina and Paprzycki 1988;Kamdem et al 2002;Pétrissans et al 2003;Hakkou et al 2005;Kocaefe et al 2008). The main problem of this treatment is, however, the degradation of some mechanical properties, mainly bending strength (Kim et al 1998) but also compression strength parallel to grain, modulus of elasticity in bending, janka hardness, impact bending strength, and tension strength perpendicular to the grain decrease (Korkut et al 2008). …”

Section: Introductionmentioning

confidence: 99%

Comparison between heat treated sapwood and heartwood from Pinus pinaster

et al. 2013

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Sapwood and heartwood samples of Pinus pinaster were treated in an oven at 190ºC and 200ºC for 2-6h. Dimensional stability, measured as Anti Shrinking Efficiency (ASE) between 0% and 65% relative humidity, durability against fungi, mechanical resistance (MOE and MOR), hardness and chemical composition were determined for treated and untreated sapwood and heartwood. Radial ASE reached 52% for sapwood and 50% for heartwood while tangential ASE reached 50% and 40% respectively. MOE increased slightly at the beginning of the treatment decreasing afterwards. No significant differences were found between sapwood and heartwood. MOR decreased by 50% and 30% for sapwood and heartwood respectively. A significant increase in durability against Rhodonia placenta was found for both heartwood and sapwood at the higher temperature and for heartwood only at 190º for 4h.

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“…Korkut et al (2007) observaram para a madeira de Pinus sylvestris L. uma maior redução no MOR, da ordem de 11,08% inferior à madeira sem tratamento.…”

Section: Resultsunclassified

EFEITO DA TERMORRETIFICAÇÃO NAS PROPRIEDADES MECÂNICAS DAS MADEIRAS DE<i> Pinus taeda</i> E <i>Eucalyptus grandis</i>

Modes¹,

Santini²,

Vivian³

et al. 2017

Ciênc. Florest.

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RESUMOA presente pesquisa objetivou investigar o efeito da técnica de retificação térmica, empregada sob duas condições de tratamento, nas propriedades mecânicas das madeiras de Pinus taeda L. e Eucalyptus grandis W. Hill ex Maiden. De cada espécie foram amostradas três árvores com 25 anos e, de cada uma, retirada a primeira tora com 2 m de comprimento da qual foi obtida duas pranchas de dimensão 7,0 x 20,0 cm (espessura x largura, respectivamente) diametralmente opostas e destas confeccionados 30 corpos de prova para cada tratamento. No primeiro deles, denominado combinado, as madeiras foram submetidas à termorretificação em autoclave a 130/±3°C e pressão de 2 kgf/cm², por 3 horas e, após um período de condicionamento, submetidas ao calor em estufa elétrica a 160/±1°C, pelo mesmo período. O segundo tratamento consistiu apenas na termorretificação em estufa. Avaliaram-se ainda peças de madeira sem tratamento (testemunha). As propriedades mecânicas foram avaliadas por meio dos ensaios para determinação dos módulos de elasticidade e ruptura em flexão estática, resistência máxima à compressão paralela à grã e dureza Janka, conforme norma ASTM D 143 (1995), e resistência ao impacto, conforme norma ABNT NBR 7190 (1997). Para a madeira de Pinus taeda, observou-se que o tratamento em estufa forneceu os piores resultados, tanto em função da redução nos valores de carga suportada de um maior número de propriedades mecânicas avaliadas, como em relação aos menores incrementos na resistência quando observado um aumento das mesmas atribuídas ao tratamento térmico. Na madeira de Eucalyptus grandis, o tratamento combinado reduziu um maior número de propriedades mecânicas da madeira. Palavras-chave: retificação térmica; propriedades mecânicas; Pinus; Eucalyptus ABSTRACTThis study investigated the effect of thermal treatment, employed under two treatment conditions on mechanical properties of wood of Pinus taeda L. and Eucalyptus grandis W. Hill ex Maiden. From each species, three 25-year tress were sampled, and from each one, it was taken the first 2-meter long log, which was obtained from two boards of size 7,0 x 20,0 cm (thickness x width respectively) diametrically opposite from where 30 specimens were saw for each treatment. At the first one, called the combined one, the woods were subjected to heat treatment by autoclaving at 130 / ± 3°C and pressure of 2 kgf / cm ² for 3 hours and, after a conditioning period, subjected to heat in an electric oven at 160 / ± 1°C for the same period. The second treatment consisted only of heat treatment in oven. It was also evaluated the pieces of wood

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The effects of heat treatment on some technological properties of Scots pine (Pinus sylvestris L.) wood

Cited by 108 publications

References 9 publications

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

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

Comparison between heat treated sapwood and heartwood from Pinus pinaster

EFEITO DA TERMORRETIFICAÇÃO NAS PROPRIEDADES MECÂNICAS DAS MADEIRAS DE<i> Pinus taeda</i> E <i>Eucalyptus grandis</i>

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