تاثير زمان بخارزني بر ويژگي هاي تخته فيبر با دانسيته متوسط (MDF) ساخته شده از چوب Eucalyptus microtheca

The effect of steaming time on Medium Density Fiberboard (MDF) properties produced from Eucalyptus microtheca wood

In this investigation, the influence of steaming time on MDF properties made from Eucalyptus wood (Eucalyptus microtheca sp.) have been studied. Variable factors were steaming time in two levels ( 7.5 and 15 minutes), press temprature in two levels (165 and 175°c ) and press time in three levels (3, 4 and 5 minutes). The results of this study indicated that,the highest and lowest MOR and MOE , were observed on MDF boards that produced in 15 and 7.5 minutes steaming time respectively. The results also showed that MOR and MOE of boards produced with 165 press temprature were higher than boards that produced with 175oc, significantly. However, the effect of press time on MOR was not significant, with increasing of press time, MOE of boards decreased, significantly. The results showed that steaming time on IB had significantly effect and the highest IB related to boards produced under 7.5 minutes steaming time condition. Also press temprature had significant effect on IB, and the highest of IB observed in boards produced in 165°c.The combined effect of steaming time and press temprature on IB was significant and the lowest of IB observed in the 15 minutes of steaming time and 175°c press temprature. The effect of steaming time on thickness swelling was significantand the lowest and highest of thickness swelling of boards revealed in 7.5 and 15 minutes of steaming time.