Efeito do Tipo de Chapa de Partículas nas Propriedades Físicas e Mecânicas

Abstract

RESUMOEste trabalho teve como objetivo avaliar chapas de partículas do tipo aglomerado convencional, chapas tipo Medium Density Particleboard (MDP) e as do tipo aglomerado com inclusão laminar. As chapas avaliadas foram fabricadas com partículas de Acacia mangium e no aglomerado com inclusão laminar utilizaram-se lâminas de Schizolobium amazonicum. O aglomerado convencional e o aglomerado com inclusão laminar apresentaram umidade de equilíbrio higroscópico estatisticamente superior ao MDP. O aglomerado com inclusão laminar apresentou maior índice de inchamento em espessura após duas horas de imersão em água, valores de módulo de ruptura em flexão estática maiores e maior resistência ao arrancamento de parafuso. As chapas do tipo MDP apresentaram maior resistência à tração perpendicular. Não foram observadas diferenças significativas nas demais propriedades. Conclui-se que a inclusão laminar melhorou o módulo de ruptura e o arrancamento de parafuso, enquanto a utilização de partículas finas nas faces melhorou as propriedades físicas das chapas.Palavras-chave: aglomerado convencional, painel de partículas de média densidade, inclusão laminar. Effect of Particleboard Type in Physical and Mechanical Properties ABSTRACTThis study aimed to evaluate physical and mechanical properties of conventional agglomerate, medium density particleboard and agglomerate with laminate inclusion. Particleboards were made of Acacia mangium particles and laminas of Schizolobium amazonicum were used to produce agglomerate with laminate inclusion. Conventional agglomerate and agglomerate with laminate inclusion showed hygroscopic equilibrium moisture statistically superior to MDP. Agglomerate with laminate inclusion showed the highest rate of thickness swelling after 2 hours of immersion in water, the highest modulus of rupture in bending strength and the best screw withdraw resistance. MDP presented the highest mean value of board internal bond strength. There were no significant differences in other evaluated properties. It was concluded that laminate inclusion improved modulus of rupture and screw withdraw resistance while the use of fine particles on the faces improved physical properties of the particleboards.

Wood-bamboo particleboard: Mechanical properties

“…Figure 4(a, b) showed that, in numerical values, there is an increasing trend in strengths according to the bamboo percentage increase, although the results have demonstrated a statistical equivalence. Cabral et al (2016) found the mean value of 14.89 MPa for the static bending in modulus of rupture of medium-density particleboards based on Acacia mangium wood. Melo et al (2015) verified the static bending for different wood and bamboo proportions (0%, 25%, 50%, 75%, and 100%) of lignocellulosic particleboards based on ureaformaldehyde resin.…”

Low-density particleboard properties produced with jupati particles and eucalyptus wood

“…Following the trend of sustainable development combined with the objectives set by Agenda 2030 (UN, 2015), which values inclusive industrialization and sustainable production and consumption patterns, it is understood that the use of this by-product of jupati for the production of particleboards can be a viable alternative to give them a better use and at the same time, create an innovative material. It is noteworthy that, including new raw materials in products such as panels, becomes a major attraction in the area of industrialization, solving, in part, the environmental problem caused by waste, in addition to meeting the demand for raw materials, also causing a reduction in its costs, adding value to the final product (Cabral et al, 2016).…”