Properties of Thermo-Mechanically Treated Wood From Pinus Caribaea Var. Hondurensis

Santos, Cristiane Moreira Tavares dos; Menezzi, Claudio Henrique Del; Souza, Mário Rabelo de

doi:10.15376/biores.7.2.1850-1865

Cited by 11 publications

(10 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For wood also from the cerrado, Santos et al (2012), found radial, tangential and volumetric contractions of 4.12, 6.34 and 10.46%, respectively, and anisotropic factor of 1.54. Trianoski et al (2013), when evaluating the dimensional stability of tropical pine species, reported values of 2.42, 5.74 and 8.95% respectively for the radial, tangential and volumetric directions and an anisotropic coefficient of 2.52.…”

Section: Variation Of the Contraction Of The Wood By Diametric Class And Position In The Logmentioning

confidence: 94%

PHYSICAL PROPERTIES OF WOOD Pinus caribaea var. caribaea, Pinus caribaea var. hondurensis AND Pinus oocarpa FOR PENCIL PRODUCTION

Loiola

Klitze

Rocha

et al. 2021

View full text Add to dashboard Cite

The behavior of the physical properties of wood is important for its use in the industrial sector. Manufacturing for pencil production requires raw material with low specific mass and high dimensional stability. The objective of this study was to evaluate the properties of the physical specific basic mass properties, anhydrous and green, as well as the retractability of the 14 years old Pinus caribaea var. caribaea, 25 years old Pinus caribaea var. hondurensis and 35 years old Pinus oocarpa in the medulla sense of the bark, base and top of the trees. All species come from the Brazilian Cerrado region afforestation. As for dimensional stability, the Pinus caribaea var. caribaea and Pinus oocarpa had similar behaviors to the volumetric contraction, when evaluating the coefficient of anisotropy of wood species of Pinus caribaea var. caribaea had higher values of anisotropy coefficient, however, all tropical pine studied, qualify as a raw material for the pencil industry, being an alternative species traditionally used.

show abstract

Section: Variation Of the Contraction Of The Wood By Diametric Class And Position In The Logmentioning

confidence: 94%

PHYSICAL PROPERTIES OF WOOD Pinus caribaea var. caribaea, Pinus caribaea var. hondurensis AND Pinus oocarpa FOR PENCIL PRODUCTION

Loiola

Klitze

Rocha

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Therefore, it is important to know these variables behavior to improve the interaction between wood, finishing, and gluing products, since a surface with high wettability offers high glue line shear resistance (Freeman & Wangaard, 1960). Studies on tropical wood or hardwood wettability are scarce, but Boehme & Hora (1996), Kishino & Nakano (2004), and Buyuksari et al (2011) can be cited, as well as the studies carried out in Brazil by Soares et al (2011), Oliveira et al (2010) and Santos et al (2012). In this context, the objective of the present work was to evaluate the roughness and wettability of 11 Amazonian hardwoods.…”

Section: Introductionmentioning

confidence: 95%

Surface wettability and roughness of 11 Amazonian tropical hardwoods

Amorim¹,

Ribeiro²,

Martins³

et al. 2013

Floram

View full text Add to dashboard Cite

The purpose of this study was to evaluate the wettability and surface roughness of 11 Amazonian hardwoods. Surface roughness was evaluated by a profilometer, while wettability was measured by a goniometer. Distillated water and phenol-formaldehyde were employed to study wood wettability. A 10-μL drop was placed on the wood surface and the contact angle was measured every 2 seconds for 120 seconds. The Virola michelii and Trattinnickia burserifolia wood specimens analyzed presented different roughness values according to the surface evaluated, radial or tangential. Regarding wettability, Virola michelii wood showed the lowest water contact angle on the tangential surface, while the radial surface presented better wettability for phenol-formaldehyde. The wettability of the species studied was not clearly affected by surface roughness, which depends on wood density.

show abstract

“…Esses tratamentos permitem que a madeira tratada seja usada em condições menos favoráveis e competir com madeiras tropicais de custo superior (ESTEVES et al, 2007). YILDIZ et al, 2006;BRITO et al, 2008;MBURU et al, 2008;GONZÁLEZ-PEÑA et al, 2009 ESTEVES et al, 2005;BRITO et al, 2006;ESTEVES et al, 2007;DEL MENEZZI et al, 2009;BATISTA e KLITZKE, 2010;MODES, 2010;SANTOS et al, 2012 Uma forma bastante usual de avaliar melhoras na estabilidade dimensional de madeiras tratadas termicamente é utilizando o cálculo da eficiência anti contração (ASEanti-shrinking efficiency) e eficiência anti inchamento (ASEanti-swelling efficiency).…”

Section: Revisão Bibliográfica 1 -Eucalyptus Benthamii (Maiden E Cambunclassified

“…Esses cálculos têm sido usados por muitos pesquisadores e demonstram a eficiência do aumento da estabilidade dimensional (CAO et al, 2011;ESTEVES et al, 2005;ESTEVES et. al, 2007;TUONG e LI, 2010 ESTEVES et al, 2005;ESTEVES et al, 2007;DEL MENEZZI et al, 2009;BATISTA e KLITZKE, 2010;SANTOS et al, 2012 Hill (2006).…”

Section: Revisão Bibliográfica 1 -Eucalyptus Benthamii (Maiden E Cambunclassified

“…No entanto, a resistência à tração transversal reduziu em 26% após o tratamento. Tendência de melhorias no módulo de elasticidade também foram observadas porSantos et al (2012), porém, diferente do trabalho anterior, essa tendência também foi observada para o módulo de ruptura à flexão, resistência à compressão paralela e dureza. Tal comportamento de aumento tanto na rigidez quanto na resistência da madeira tratada pode ser explicado por se tratar de um tratamento térmico aliado à densificação.O tipo de tratamento térmico empregado influencia diretamente no comportamento das propriedades mecânicas(MODES, 2010).…”

unclassified

See 1 more Smart Citation

Processamento termo-hidro-mecânico da madeira de Eucalyptus Benthamii (maiden e cambage)

Martins¹

View full text Add to dashboard Cite

THERMO-HYDRO-MECHANICAL PROCESSING OF Eucalyptus benthamii (Maiden e Cambage) WOOD The replacement of non-renewable material by wood-based material is crucial for the development of a sustainable society. Thus, the development of thermo-hydro and thermohydro-mechanical processing techniques might be a key factor in such a context. The goal of this study was to evaluate the usefulness and the viability of those processes, aiming to improve the dimensional stability and to find an alternative to the conventional Eucalyptus benthamii wood bonding processes. In order to accomplish that, the effect of heat treatment on the physical (density, dimensional stability, equilibrium moisture content, cell wall physical analysis and wettability), chemical (extractives, lignin and polysaccharides), mechanical (rupture and elasticity modules) and colorimetric (L*, a*, b*, C e h*) properties was evaluated by three different methods: Plato ® , inert atmosphere and Oléothermie. The welding strength was also checked under three different sets of parameters. The strengths of the joints were measured in tension shear and through percentage of wood failure. Moreover, the density profile in welded interfaces was also tested. The Plato ® treatment improved dimensional stability, decreased wettability, rupture and elasticity modules and made the wood darker. The main changes in chemical composition were the decrease of hemicellulose content and an increase of extractives. The inert atmosphere treatment improved dimensional stability, decreased wettability and the rupture module, changed wood color, making it darker and changed its chemical composition as well, decreasing xylose, arabinose and extractives values. The Oléothermie treatment did not affect dimensional stability. However, it decreased the equilibrium moisture content and wettability, made the wood darker and changed its chemical composition, decreasing the xylose value and increasing the lignin and extractives rates. The mean strength obtained in welding was 10,30 MPa with 100% wood failure. The welding interface density was superior than that of the wood, attaining maximal values between 700 and 800 kg/m 3. Given the results, we conclude that the welding process proved feasible for E. benthamii wood joining and that the heat treatment can change its physical, mechanical, chemical and colorimetric properties, depending on the method employed.

show abstract

Properties of Thermo-Mechanically Treated Wood From Pinus Caribaea Var. Hondurensis

Cited by 11 publications

References 19 publications

PHYSICAL PROPERTIES OF WOOD Pinus caribaea var. caribaea, Pinus caribaea var. hondurensis AND Pinus oocarpa FOR PENCIL PRODUCTION

PHYSICAL PROPERTIES OF WOOD Pinus caribaea var. caribaea, Pinus caribaea var. hondurensis AND Pinus oocarpa FOR PENCIL PRODUCTION

Surface wettability and roughness of 11 Amazonian tropical hardwoods

Processamento termo-hidro-mecânico da madeira de Eucalyptus Benthamii (maiden e cambage)

Contact Info

Product

Resources

About