Effect of thermal rectification on machinability of Eucalyptus grandis and Pinus caribaea var. hondurensis woods

Moura, Luiz Fernando de; Brito, José Ótávio; Nolasco, Adriana Maria; Uliana, Lis Rodrigues

doi:10.1007/s00107-010-0507-x

Cited by 27 publications

(34 citation statements)

References 3 publications

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“…On the whole, the average values of L*, a* and b* decreased as the temperature and heating time rose. That was also observed by Moura and Brito (2011), Esteves et al (2008) and Unsal et al (2003) in studies with E. grandis, E. globulus and E. camaldulensis wood respectively. According to Hill (2006), physical modifications in thermally modified wood depend heavily on the conditions of the methods applied and the colorimetric modifications are related to temperature and length of treatment.…”

Section: Resultssupporting

confidence: 70%

“…The biggest reduction in the coordinate green-red (a*) in radial and tangential sections also occurred in the treatment at 240ºC for 8 h. The a* showed reduction since the treatment at 180ºC for 8 h. The constant reduction in a* in wood is related to the volatilization of phenolic compounds as the temperature increases (Moura and Brito 2011). The coordinate yellow-blue (b*) showed a similar behavior in radial and tangential sections.…”

Section: Resultsmentioning

confidence: 93%

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THERMAL MODIFICATION OF Eucalyptus grandis WOOD: VARIATION OF COLORIMETRIC PARAMETERS

Cademartori

Schneid

Gatto

et al. 2013

Maderas, Cienc. tecnol.

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The color modifications in Eucalyptus grandis thermally modified wood were investigated. One hundred eighty specimens (10 x 10 x 200 mm) were prepared and thermally modified in an electric kiln for 4 and 8 h at 180-240ºC. The color parameters (L*, a*, b*, C*, h* and ΔE) were determined by the CIE-L*a*b* method on radial and tangential sections of untreated and treated wood. The results indicated the darkening of specimens in the radial and tangential sections. Both sections showed variation of L* between 73 and 30, a* between 9 and 5 and b* between 20 and 8. The thermally modified wood at 180 and 200ºC showed similar patterns, equally at 220 and 240ºC. The time of exposure indicated significance just in treatment at 200ºC.

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Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 93%

THERMAL MODIFICATION OF Eucalyptus grandis WOOD: VARIATION OF COLORIMETRIC PARAMETERS

Cademartori

Schneid

Gatto

et al. 2013

Maderas, Cienc. tecnol.

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“…The cutoff used was 2.5 mm, as recommended for wood in previous research by Gurau et al (2006) and several other researchers (Unsal and Ayrilmis 2005;Korkut et al 2009;de Moura et al 2011).…”

Section: Materials Methods and Equipmentmentioning

confidence: 99%

Milling of Heat-Treated Beech Wood (Fagus sylvatica L.) and Analysis of Surface Quality

Ispas¹,

Gurău²,

Câmpean³

et al. 2016

BioResources

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Several previous studies have investigated the effects of heat treatment on the chemical composition, along with the physical and mechanical properties, of wood from various species. However, the effects of these property changes upon the machining properties and surface quality of machined wood have been studied much less. The main goal of this work was to investigate the comparative cutting power consumption during milling and the resulting surface roughness of heat-treated and untreated beech wood (Fagus sylvatica L.). Several cutting regimes were tested by combining different values of rotation speed, feed speed, and cutting depth. The cutting power and the processing roughness were assessed and compared. The results clearly showed that the cutting power involved in the milling of heat-treated beech wood was up to 50% lower than that of untreated wood, but the processing roughness was slightly higher.

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“…The process of thermal degradation of wood produces changes in color due to dark-brown quinones formed after oxidation of phenolic compounds (CARVALHO et al, 2014;MOURA;BRITO, 2011). Pinus sp.…”

Section: Resultsmentioning

confidence: 99%

Wettability and surface free energy on heat-treated Pinus sp. and Erisma sp. woods

Ziglio¹,

Santos²,

Mendes³

et al. 2017

Sci. For.

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This study aims to investigate wettability, surface polarity, and mass loss in two reforestation woods, Pinus sp. (softwood) and Erisma sp (hardwood), after heat treatment. The wood samples were heated to 100 °C, 140 °C and 180 °C, meanwhile a control group was kept at a fixed temperature of 25 °C. Different test liquids were employed in order to obtain the contact angles (wetting angles) formed on the heat-treated sample surfaces. From such measurements, the values of surface free energy, in terms of its polar and dispersive components, were calculated by the Owens-Wendt-Rabel-Kaelble approach. Temperatures far below 180 °C proved to be high enough to yield hydrophobic samples, i.e., with relatively high wetting angles and low surface polarity, but without drastic visual and dimensional changes. The impact of heat treatment on the surface properties of Pinus sp. and Erisma sp. was also verified by fungal inoculation (Pycnoporus sanguineus). Compared to Pinus sp., heat-treated Erisma sp. showed improved properties, such as mass stability, surface polarity and wettability.

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Effect of thermal rectification on machinability of Eucalyptus grandis and Pinus caribaea var. hondurensis woods

Cited by 27 publications

References 3 publications

THERMAL MODIFICATION OF Eucalyptus grandis WOOD: VARIATION OF COLORIMETRIC PARAMETERS

THERMAL MODIFICATION OF Eucalyptus grandis WOOD: VARIATION OF COLORIMETRIC PARAMETERS

Milling of Heat-Treated Beech Wood (Fagus sylvatica L.) and Analysis of Surface Quality

Wettability and surface free energy on heat-treated Pinus sp. and Erisma sp. woods

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