IJE TRANSACTIONS A: Basics Vol. 26, No. 1 (January 2013) 39-44   

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S. M. Hosseini and M. Fadaei
( Received: October 13, 2012 – Accepted: November 15, 2012 )

Abstract    This study was Characteristics of manufacture particleboard (PB) from sedar and wood slab of impregnated with UF. The chips were divided into coarse chips with dimensions of 2-4 mesh and fine chips of 30–60 mesh, urea formaldehyde (UF) resin solution at concentrations of 45 %, and 55% sprayed on these chips about 1 min until 10% to dry weight chips, they were dried under 5% moisture in a dram dryer before impregnated with resin. Three-layer mats with target densities of 0.70 g/cm3 were formed by using fine chips for the face layer (20%) and back layer (20%) and coarse chips for the core layer (60%). A conventional hot press was used for fabrication of the PB, and the temperature, pressure and pressing time were 2.7 MPa, and 240 sec, respectively. The nominal dimensions of particleboard were 3660×1830×16 mm (thick).Result showed that the mechanical properties of PB increased with an increase in the percent of UF. Their represented could by efficacy between proportion of sedar with slab, Also percent of surface with core layers. The bending strength, internal bonding strength, and thickness swelling (%) of the UF-impregnated particleboards exhibited excellent performances compared to those made in the past


Keywords    Mechanical properties, Thickness Swelling, Particleboard, Sedar, Slab


چکیده    در این تحقیق خصوصیات تخته خرده چوب ساخته شده از چوب سوزنی برگان در مخلوط با چوب ضایعاتی پشت لا آغشته شده با چسب اوره فرمالدهید مورد بررسی قرار گرفت. ذرات آماده برای لایه میانی با مش 2 تا 4 و برای لایه سطحی با مش 30 تا 60 انتخاب شدند. غلظت چسب برای لایه سطحی 45 و لایه میانی 55 درصد انتخاب شد. چسب با نسبت 10 درصد نسبت به وزن ذرات چوب با رطوبت 5 درصد اضافه شد.کیک 3 لایه با نسبت 60 درصد برای لایه میانی و 2 لایه سطحی (هر کدام 20 درصد برای ساخت تخته خرده چوب با دانسیته 7/0 گرم بر سانتی متر مکعب انتخاب شد. مولفه های پرس با زمان 240 ثانیه و فشار 2.7 مگاپاسکال تعیین شد. ابعاد تخته16×3660×1830 میلیمتردر نظر گرفته شد. نتایج نشان دادند خصوصیات مکانیکی محصول با افزایش چسب بهبود می یابد. این اثر می تواند تحت تاثیر نسبت ضایعات پشت لا با چوب سوزنی برگ و اثر نسبت لایه سطحی به میانی تخته باشد.


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