Does the Addition of Cotton Wastes Affect the Properties of Particleboards?

Abstract

A wide range of materials for the development of new products can be obtained from natural resources. Good examples of these materials are lignocellulosic wastes, which are a good alternative for the production of particleboards. This study aimed to evaluate the feasibility of using cotton wastes in association to eucalyptus particles in the production of particleboards. Cotton waste proportions used were 0, 10, 20 and 30%. Urea formaldehyde (UF) adhesive was applied at 12%, based on dry the weight of particles. Physical and mechanical tests were performed in order to evaluate panels. Water Absorption (2 and 24 h) and Internal Bond (IB) showed not significant effect with increased percentage of cotton waste. Thickness Swelling (2 and 24 h) of particleboards increased with increased percentage of waste material. The Modulus of Elasticity for cotton waste particleboards ranged from 726.47 ± 99.98 to 205.12 ± 66.24 MPa, while the Modulus of Rupture ranged from 8.63 ± 1.39 to 3.87 ± 0.75 MPa. According to results, cotton wastes could be added to particleboards up to the percentage of 9%, being indicated for the manufacture of some types of furniture such as doors and sides.

Conventional Low-density Particleboards Produced With Particles From Mauritia Flexuosa and Eucalyptus Spp. Wood

“…A higher compression ratio can be related to the increase in the amount of particles, and, consequently, greater densi cation of the panel, thus promoting greater hygroscopic swelling of the Mauritia exuosa particles and the release of greater compression tensions generated during the high temperature pressing process. Scatolino et al (2019) produced low density particleboards with Eucalyptus urophylla x Eucalyptus grandis wood and cotton waste and observed mean values ranging between 11.34 and 23.93% for thickness swelling after 2 hours of immersion and 14.17 and 27.45% after 24 hours of immersion, therefore, values close to those observed in this work. The Commercial Standard -CS 236-66 (1968) stipulates maximum thickness swelling values after 24 hours of immersion of 30% for low density particleboards produced with urea-formaldehyde adhesive.…”

“…As the basic density of the particles of Mauritia exuosa was 3.6 times lower than those of Eucalyptus spp. the panels produced may present a reduction in several physical and mechanical properties, due to the greater volume of particles in the panels (Scatolino et al 2019).…”

“…The basic density of Mauritia exuosa particles was obtained after particle saturation and subsequent volume measurement in a measuring cylinder. The particles were oven dried at 105 ± 2 °C for 24 h and the dry weight/saturated volume ratio was calculated, following the methodology described by Scatolino et al (2019). The basic density of the wood was carried out following the guidelines of the NBR 11941 (ABNT 2003) standard.…”

Influencia de la distribución granulométrica en propiedades de tableros aglomerados de residuo de desmote de algodón y resina urea formaldehído

“…En este sentido, es posible considerar que la presión de moldeo de 3 MPa resulta insuficiente para lograr una adecuada adhesión de las partículas, dejando espacios que no han podido ser llenados. Este comportamiento difiere del observado en investigaciones en las que los paneles están fabricados a partir de otros residuos lignocelulósicos y resinas, para los cuales presiones de moldeo entre 2,4 y 3,5 MPa permiten lograr un comportamiento satisfactorio [13,19,23,[34][35].…”

“…Vanoli Scatolino et al [35] definieron el índice de compactación como la relación entre la densidad aparente del tablero de partículas y la densidad de las partículas utilizadas para su producción. En sus trabajos, el bajo valor de densidad de los residuos de algodón resultó en un aumento significativo en los valores de la tasa de compactación a medida que aumentó el porcentaje de residuos en paneles elaborados con residuos de desmotado de algodón y eucalipto, lo cual indica un mayor número de partículas panel.…”