Variação radial das estruturas da madeira de Acrocarpus fraxinifolius Wight &amp; Arn

Nisgoski, Silvana; Trianoski, Rosilani; Muniz, G. I. B. de; Matos, Jorge Luís Monteiro de; Stygar, Marina

doi:10.4322/floram.2012.037

Cited by 4 publications

(4 citation statements)

References 6 publications

(6 reference statements)

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“…The panels with five Indian cedar veneers showed the best results for MOR and MOE in the parallel direction and also the best results for dry and wet SS. The increase of the cedar veneers improves the mechanical properties due to the higher basic density of the cedar, since, in general, this property has a positive correlation with the mechanical properties of the wood (Nisgoski et al, 2012). The variations observed in the properties of the panels with three cedar veneers in different positions for the MOE parallel to the fibers are related to the position of the fibers in the Indian cedar veneers, once these veneers are more resistant and rigid than the veneers of pine.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Physical-mechanical Properties of Plywood Produced With Acrocarpus fraxinifolius and Pinus oocarpa

et al. 2019

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The present study has the objective of evaluating the physical-mechanical properties of plywood produced with Acrocarpus fraxinifolius wood, as well as the effect of combining their veneer with Pinus veneer. The wood of Acrocarpus fraxinifolius and Pinus oocarpa were used in the production of the panels. The plywood was produced with five veneers; the adhesive used was phenol-formaldehyde, weighing 320 g.m -2 . The evaluated properties were: equilibrium moisture (EM), specific mass (SM), water absorption (WA), thickness swelling (TS), shear strength (SS), modulus of rupture (MOR) and modulus of elasticity (MOE) both parallel and perpendicular to the fibers. No statistical difference was observed in the EM and TS, whereas all other properties showed statistical differentiation between the treatments. In general, the use of Acrocarpus fraxinifolius veneers improved the physical-mechanical properties of the compensated ones. Thus, the use of this species in the production of plywood is technically feasible.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Physical-mechanical Properties of Plywood Produced With Acrocarpus fraxinifolius and Pinus oocarpa

et al. 2019

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“…In relation to the vessel elements, as explained by Nisgoski et al (2012), the increase in the tangential diameter in the pith to bark direction are characteristic aspects of plant development, such as an anatomical adaptation of the xylem to increase the volume of mineral sap, thus increasing its photosynthetic capacity.…”

Section: Anatomical Characterization Of the Growth Ringsmentioning

confidence: 99%

RADIAL GROWTH DYNAMICS OF Khaya ivorensis TREES FROM EXPERIMENTAL PLANTATION

et al. 2018

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The objective of this study was to characterize the formation of growth rings in Khaya ivorensis wood, as well as to analyze the variation in the morphology of the vessel elements, aiming to understand the growth of this species in experimental plantations. Disks from the bases of five trees were collected, and after polishing the cross-section, demarcation of the growth rings limits was carried out. The anatomical study of the wood was conducted with the purpose of characterizing the rings, and their width was measured by means of scanned images of the disks. A historical series of data was obtained concerning the diameter of the trees to establish a correlation with the width of the rings measured over the years. The growth rings limits of African mahogany wood are demarcated by a thin layer of marginal parenchyma, and the presence of false rings has been observed. Significant annual growth correlation of 0.62 was observed among the trees, being the radial increment of irregular wood in the first years (wide and narrow rings), and highlighting the 3rd and 11th year of growth in which the largest increases were observed due to a biological adaptation tendency to the environment and the occurrence of thinning carried out in the planting area, respectively.

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“…Its wood is widely used in civil construction and for the manufacture of furniture and coffins (Prado et al 2003, Lorenzi et al 2003. However, in Brazil, the specie is still practically unknown, and national studies using the species are focused on silviculture (Nisgoski et al 2012, Venturin et al 2014) and physical and chemical characterization (Prado et al 2003). Few studies have been carried out to expand the range of uses of this species, such as the potential use in OSB panels (Iwakiri et al 2014), agglomerated wood panels (Trianoski et al 2013), wood cement (Oliveira et al 2020) and other construction applications.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Acrocarpus fraxinifolius wood submitted to heat treatment

Oliveira

Aquino

et al. 2022

Maderas, Cienc. tecnol.

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Aiming to provide greater visibility for the wood species Acrocarpus fraxinifolius, the present study sought to analyze the influence of heat treatment on an industrial scale applied to wood species, also popularly known as Indian cedar. The heat treatment was carried out in an autoclave, with temperature and pressure control, and with saturated steam injection, for temperatures 155 ºC, 165 ºC, 175 ºC, and 185 ºC. Physical, chemical, and mechanical tests were carried out for the analyzed wood. The content of holocellulose and total lignin decreased, while the content of extractives showed a substantial increase. The density increased after the heat treatment, however the treated wood showed cracks, and these cracks influenced the significant loss of the values of the mechanical properties of compression, tension, and flexion. The shear showed strength gain for the temperature of 155 ºC, and the wood treated at 165 ºC was equivalent to untreated wood. The woods submitted to temperatures of 175 ºC and 185 ºC presented strength losses. The heat treatment in question contributes to increase the visibility, use and market value of wood.

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Variação radial das estruturas da madeira de Acrocarpus fraxinifolius Wight & Arn

Cited by 4 publications

References 6 publications

Physical-mechanical Properties of Plywood Produced With Acrocarpus fraxinifolius and Pinus oocarpa

Physical-mechanical Properties of Plywood Produced With Acrocarpus fraxinifolius and Pinus oocarpa

RADIAL GROWTH DYNAMICS OF Khaya ivorensis TREES FROM EXPERIMENTAL PLANTATION

Characterization of Acrocarpus fraxinifolius wood submitted to heat treatment

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