Efeito da incorporação de casca de café nas propriedades físico-mecânicas de painéis aglomerados de Eucalyptus urophylla S.T. Blake

Abstract

RESUMONeste trabalho objetivou-se avaliar a influência da incorporação de casca de café nas propriedades físico-mecânicas de painéis aglomerados produzidos com Eucalyptus urophylla S.T. Blake. Os painéis foram produzidos com incorporação de 25, 50 e 75% de casca de café, em três teores da resina fenol-formaldeído (6, 9 e 12%) e 1% de parafina. A densidade nominal dos painéis foi de 0,7 g/cm³ e o ciclo de prensagem compreendeu uma pressão de 3,92 MPa e temperatura de 180ºC por 8 minutos. Pelos resultados obtidos foi possível observar que: as propriedades físicas dos painéis aglomerados apresentam relação linear decrescente com o aumento do teor de resina, e crescente com a porcentagem de casca de café, apresentando maiores valores de absorção de água e inchamento em espessura. As propriedades mecânicas apresentam relação linear crescente com o aumento do teor de resina, e decrescente com a porcentagem de associação de casca de café. Do modo que a pesquisa foi conduzida, a incorporação da casca de café prejudica a qualidade dos painéis produzidos.Termos para indexação: Casca-de-café, aglomerado, Eucalyptus urophylla. ABSTRACTThe objective of this study was to evaluate the influence of the incorporation of Coffee husks in the production of particleboard with Eucalyptus urophylla S.T. Blake. The panels were produced incorporating 25%, 50%, and 75% of Coffee husks at three levels of resin phenol-formaldehyde (6, 9 and 12%) and 1% of paraffin. The nominal density of the panels was 0.7 g/cm³ and the cycle of pressing consisted in a pressure of 3.92 MPa under a temperature of 180°C for 8 minutes. By the results it was possible to observe that the physical properties of the particleboard have a linear relationship decreasing with the increase in the level of resin, and increasing with the increase in the percentage of coffee husks, showing higher values of water absorption and thickness swelling. The mechanical properties show a linear relationship growing with the increase of resin level, and decreasing with a reduction the percentage of coffee husk association. The way that the search was conducted, the incorporation of the Coffee husks harms the quality of the panels produced.

Use of maize cob for production of particleboard

“…This decreasing tendency was also noted by Mendes et al (2010b) when they evaluated values of internal bond as a function of increasing percentage of coffee husk in particleboard panels. These authors found a range of 0.15 to 0.30 MPa, both values being lower than all values found in this work.…”

“…agrotec., Lavras, v. 37, n. 4, p. 330 -337, jul./ago., 2013 A decrease was noted in values of MOE and MOR with increasing maize cob percentage in panels. This decreasing tendency was also noted by Mendes et al (2010b) when they evaluated values of MOE and MOR as a function of increasing percentages of coffee husk in particleboard panels. These authors found a decrease from 800 to 300 MPa for MOE, and from 6 to 2 MPa for MOR, for coffee husk use rates between 75% and 25%.…”

“…Mendes et al (2010b) also found an increasing tendency for water absorption after twenty-four hours of immersion when evaluating particleboard panels made with coffee husk in association with eucalyptus. They found results ranging between 70% and 96% to the extent that wood was being replaced by coffee husk at rates of 25% to 75%.…”

“…Figure 5 -Mean values of internal bond as a function of maize cob percentage in panels. Mendes et al (2010b), when evaluating particleboard panels with differing percentages of coffee husk being added to eucalyptus wood, found that TS2h ranged from 20% to 25% and that TS24h ranged from 37% to 32%. Melo et al (2009), when evaluating differing percentages of rice husk being added to eucalyptus wood, found 9% to 17% for TS2h, and 45% to 49% for TS24h.…”

“…Brazil is in essence an agroindustrial country and as a consequence it has several types of lignocellulosic residue with potential for use, including maize cob, husks of rice, coffee, peanut, coconut and castor oil plant, as well as banana stem, cassava stem and sugarcane bagasse, among others (MENDES et al, 2010a;MENDES et al, 2010b. ).…”