جستجوی مقالات مرتبط با کلیدواژه « Industrial wood particles » در نشریات گروه « صنایع چوب و کاغذ »

In this study, the pruning branches of mulberry trees mixed with industrial wood chips were used in the manufacture of particleboard. Then the physical and mechanical properties of the boards were investigated. For this purpose the study variables included the amount of mixing mulberry branches with industrial wood chips in four levels 0/100, 10/90, 20/80 and 30/70 and the amount of urea formaldehyde resin at two levels 12 and 14% of the dry weight of the wood chips. The results showed that increasing the amount of particles obtained from mulberry tree branches up to 20 %, had no negative impact on the physical and mechanical properties of the boards. Increasing the amount of these particles up to 30 percent had a negative impact on the physical and mechanical properties of the boards, but with increasing the amount of urea formaldehyde resin up to 14 %, could be improved dimensional stability, bending strength, modulus of elasticity and internal bonding of the particleboards.

In this study، the possibility of using sunflower stalk for composite-board manufacturing was studied. Density of the boards were 0. 45 g/cm3; variables included mixing ratios of sunflower stalk and industrial wood particles (100:0، 70:30، 50:50، 30:70 and 0:100)، type of resin at two levels of urea formaldehyde and isocyanate (PMDI) or polymeric diphenylmetane 4-4-Diisocyanate، and press-time of 5 and 7 minutes. Thickness swelling (TS) after 2 & 24 hours soaking in water، damping of sound (Damp)، modulus of rupture (MOR)، modulus of elasticity (MOE) and internal bonding (IB) of the boards were measured. The results showed that by increasing sunflower stalk particles، the amounts of TS 2&24، MOR، MOE and IB of laboratory panel were significantly increased. Isocyanate resin reduced thickness swelling after 2&24 hours soaking in water and increased damping of sound as well as modulus of elasticity. Also، urea formaldehyde resin improved modulus of rupture and internal bonding of panels. Press temperature had significant impact on the measured properties. Overall، using sunflower stalk particles up to 70 percent، isocyanate resin، and press time of 7 minutes، could result in producing boards with acceptable physical & mechanical properties which are suitable for interior uses.