O efeito do pós-fabrico nas propriedades dos painéis de fibra de alta densidade do pinho retardado

Introduction: Fiberboard panels present great advantages in furniture manufacturing despite their inherent flammability. This problem will be solved by treating those panels with the right fire retardant (FR) additives. Objectives: A set of high density fiberboard went through several hot pressing operations in order to study the influence of this procedure on the substrate properties. Methods: The experimental plan was developed for three different temperatures of 95 °C, 180 °C and 210 °C and two different pressing times (22 seconds and 35 seconds) for each. The panels were made out of pine fibers (Pinus pinaster) and had an average density of 930 kg/m3 and were 6.7 mm thick. Results: The results indicated that the post-manufacture hot-pressing of the FR-treated HDF panels led to a slight improvement in the modulus of elasticity (MOE) and in the bending strength of the panels used as substrates. A decrease in the moisture content and in the fiberboards’ thickness and an increase in their density and in their thickness swelling was observed as higher temperatures and longer pressing times were applied to the panels. Conclusions: There was also a slight decrease in the internal bonding strength of the panels due to the presence of the flame retardant which leads to a decrease in the bonding capacity of the resin. Conclusions: There was a slight improvement in the properties of the substrate except in the fiberboards’ internal bonding strength which experienced a slight decrease due to the interference of the fire retardant. Introdução: As placas de aglomerado de fibras apresentam grandes vantagens na fabricação de móveis, apesar da sua inerente inflamabilidade. Este problema pode ser melhorado tratando os painéis com os corretos aditivos retardadores de fogo. Objetivos: Um conjunto de painéis de fibra de alta densidade passou por várias operações de prensagem a quente, a fim de estudar a influência deste procedimento nas propriedades do substrato. Métodos: O plano experimental foi desenvolvido para três temperaturas diferentes de 95 °C, 180 °C e 210 °C e dois tempos diferentes de prensagem (22 segundos e 35 segundos) para cada uma. Os painéis foram feitos de fibras de pinho (Pinus pinaster) e tinham uma densidade média de 930 kg / m3 e espessura de 6,7 mm. Resultados: Os resultados indicaram que a prensagem a quente pós-fabricação dos painéis de alta densidade tratados com agentes ignifugantes conduziu a uma ligeira melhoria no módulo de elasticidade (MOE)