Screw Pullout Strength in Particleboards Manufactured with Waste of Eucalyptus grandis Wood Specie and Oat Hulls

Abstract

Eucalyptus wood species are usually found in rural constructions, civil construction, furniture and utensils, among other applications. The processing of Eucalyptus wood, which follows policies of reforestation in Brazil, generates a lot of waste, as the case of the oat hulls, which constitutes an aggravating to the environment, causing environmental impacts, which motivates the development of applications that make use of these residues, such as the case of particleboards. Among the mechanical properties commonly investigated in the characterization of the particleboards, there is the strength to screw pullout, which evaluates the bond strength of the manufactured materials. This research aimed to produce particleboards, in laboratory scale, using Eucalyptus grandis wood particles (proportions 0, 70, 85 e 100%); oat hulls particles (proportions 0, 14, 30 and 100%), both with controlled size distribution; castor oil based polyurethane resin (10, 12 and 14%, related to solid mass). These panels were evaluated concerning to pullout strength of screws (AP), from face and edge. Particle size distribution: 70 to 75% of these were found in interval ranging between 0.595 to 1.190 mm (16 to 30 mesh). Apparent density of Eucalyptus grandis and oat hulls were 0.64 and 0.29 g/cm 3 , respectively. All panels were classified as high density (greater than 800 kg/m 3 ). Compression ratio of the panels showed range from 1.25 to 3.48, remaining above the level usually recommended in literature (1.3 to 1.6), but similar to other related studies. Values of pullout strength of screws (face) met the requirements of Brazilian Standard ABNT NBR 14810:2006, for three of the twelve experimental conditions evaluated, and of pullout screw (edge), all panels met the cited requirements.

Influence of particle granulometry and panel composition on the physico‐mechanical properties of ultra‐low‐density hemp hurd particleboard

“…A further reason for thickness disparities were possible localized density variations within individual panels and consequently between replicates. Internal density variations are frequently reported in experimental settings where panels were manually formed and minimal automation during the fabrication process occurred 1,43–45 . A comparison of variant density and variant thickness at EMC is presented in Figure 4.…”

“…Internal density variations are frequently reported in experimental settings where panels were manually formed and minimal automation during the fabrication process occurred. 1,[43][44][45] A comparison of variant density and variant thickness at EMC is presented in Figure 4.…”

The Influence of Chemical Additives on Strength of Wood-Cement Composite

“…Nowadays a wide range of thermal insulation and structural materials based on discrete particles of organic origin and mineral binders for low-rise construction is known [1][2][3][4][5][6][7][8][9][10][11][12], among them woodcement composites are effectively used. The strength and strains of the wood-cement composite primarily depend on the main technological factors such as the used type of binder and wood filler, the method of preparation of wood filler, the method of molding, the conditions of hardening [1,2,12,[13][14][15][16][17].…”

Particleboards Produced With Epoxy Ink Waste and BTH Polymer as Adhesives

“…For the production of particleboards, the conversion between raw material and final product is greater, because in addition the use of all log, it can be used wood wastes from other processes (Souza et al, 2014;Alves et al, 2014;Christoforo et al, 2015).…”