بررسي تعيين مناسب ترين شرايط استفاده از مخلوط سرشاخه هاي بادوام و صنوبر بر مقاومت خمشي تخته خرده چوب

Investigation on optimization of using mixture of branchwood of amigdai and poplar on modules of rupture of particle board

in order to use lignoccllulusic materials (non forest) grown in Iran, This study has been conducted on feasibility of using amygdal tree braehes mixed with poplar particles for making partieleboard.Urea-formaldeid was used as binder (10% based on oven dry wood) and Ammonium coloride as catalizor. Among parameter affecting particleboard properties,three parameters were selected as dependent: Percentage of amygdal tree branches in mixture (0,15,30.45,100%), Press pressure 4 Mpa and 10Mpa, and press temperature 140 and 160"ʹ .Other process parameter were kept constant.Three boards were made in each condition cut from produced partieleboards and tested.Rcsults showed that increase amygdal tree branches in mixture causes some decrease in modules of ruplure.Optimized treatment was introduced as below percentage of amygdal tree branches in mixture(15-30%),press pressures 10Mpa and press temperature 160o(. Short key:Particleboard, Moduls of Rupture. Poplar, Amygdal