كليدواژه :
تخته فيبر با دانسيته متوسط , بازدارندگي جذب رطوبت و آب , اثر ضد واكشيدگي , صنوبر , استيله كردن
چكيده لاتين :
In this research the effects of acetylation on physical properties of medium density fiber board (MDF) were investigated. Sample boards were made from acetylated poplar fibers, which were treated with different weight percent gains (WPG) of 0, 2.22, 15.97, and 19.08%) at two press temperatures (170 & 185° ). The results were analyzed based on a complete randomized design (CRD) under a factorial experiment with two factors (WPG & press temperature). Results revealed that the acetylation decreased moisture absorption in the boards made from acetylated fibers. As it was determined, the moisture absorption in the boards made from acetylated fibers with the highest WPG (19.08%) was measured 44.58, 42.24, 36.93 and 39.36% at relative humidities of 33, 50, 70 and 96%, respectively. It was revealed that the acetylation increased ASE in MDF boards. The acetylation reduced water absorption and thickness swelling in the MDF boards after soaking in water for 2 and 24 hours. Concerning the results, moisture absorption was determined 42.63% in the acetylated boards (19.08% WPG) and 89.98% in the untreated boards. The ASE was measured as 78.22 and 65.17% in acetylated boards with the highest WPG after 2 and 24 hours of soaking in water, respectively. Also, it was indicated that increasing of press temperature reduced moisture absorption in the boards. The research results showed that the acetylation enhances physical properties in the medium density fiberboard.
