تاثير جهت استقرار تراشه و شرايط پرس كردن بر كيفيت تخته تراشه ساخته شده از ضايعات روكش

Effects of strand orientation and press cycle on properties of OSB made from Iranian beech strands

The utilization of beech waste veneers collected from a veneer mill for manufacturing oriented strand hoard (OSB) was studied. Core strand orientation (parallel to the surface layer, right angle to the surface layer and randomly oriented), press temperature (170 °C and 190 ʹC) and press time (10 min. and 15 min.) were considered as variables. Strand dimension, board thickness, hoard density, resin type, resin amount, press pressure and press closing time were kept constant for all manufactured hoard. Physical and mechanical properties of boards were determined. Results showed that when strands laid parrallel to the surface layer, Modulus of rupture (MOR) and Modulus of elasticity (MOE) reach the highest values however the highest internal bond and lowest thickness swelling were observed in hoards in which core strands were laid cross to the surface layer. Press temperature and press time had modifying effects on board properties. It was concluded that beech waste veneers ʹcan be recycled and used as raw material for producing OSB.