Abstract
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.
Highlights
Among the various species of wood and of economic interest worldwide is Pinus, being used as a raw material for the forest-based industry
The physical properties of wood of various species change according to the growth radius of the tree and the portion of wood corresponding to the first growth rings; features thinner cell walls, shorter tracheids, characterizing differences between juvenile and adult wood, according to reports by Juízo et al (2015)
Basic wood specific mass The results for the basic specific mass, anhydrous and green for the studied tropical pine species are in Tabela 1
Summary
Among the various species of wood and of economic interest worldwide is Pinus, being used as a raw material for the forest-based industry. Due to the rapid growth of homogeneous Brazilian forest stands destined to the manufacture of solid wood products, the use of increasingly young trees is more and more frequent, which can compromise their formation and constitution and can compromise its formation and constitution, such as its anatomical structure, chemical composition and physical properties (VIDAURRE et al, 2013, BRAZ et al, 2014). The physical properties of wood of various species change according to the growth radius of the tree and the portion of wood corresponding to the first growth rings; features thinner cell walls, shorter tracheids, characterizing differences between juvenile and adult wood, according to reports by Juízo et al (2015). The knowledge of the behavior of the dimensional variations of the wood offers technical subsidies for the behavior of the raw material in its use in service. The occurrences of wood warps are related to dimensional variations and are caused by the FLORESTA, Curitiba, PR, v. 51, n. 2, p. 354-362, abril/jun 2021
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