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

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.

Physical and mechanical wood properties of two varieties of Pinus caribaea

“…For the volumetric shrinkage, coefficient of anisotropy, radial and tangential shrinkage, there were no significant differences between the varieties of Pinus caribaea (Table 2 and Figures 2c-f). The mean values obtained for volumetric shrinkage are lower than those observed by Loiola et. al.…”

“…Radial and tangential retractions are considered low by Carvalho (1996). Being lower than those observed by Loiola et. al.…”

“…The volumetric retraction values are considered as low, that is, little retraction as specified by Carvalho (1996). In the case of the anisotropy coefficient, the mean values obtained for volumetric shrinkage are higher than those observed by Loiola et al (2021) (Table 2, Figure 2d).…”

“…Mean basic density values (Table2, Figure2b) were lower than those observed byTrianoski et al (2013),Zanuncio et al (2022),Gonçalez et al (2018) andLoiola et al (2021), however, these authors evaluated Pinus caribaea wood at higher ages, that is, 17, 20, 20 and 25 years old, respectively. However, for wood from Pinus caribaea var.…”