عنوان مقاله [English]
نویسندگان [English]چکیده [English]
The possibility of making an adhesive free compressed wood with the dimensions of 30* 30*1 cmfrom the particleboard sanding dust was studied. The amount of sprayed water on the particleboard sanding dust was adjusted as 7, 9, 11, 13, 16 and 18 % of dry weight particleboard sanding dust. Test boards were manufactured based on 0.95 gr/cm3 target density, under press temperature of 180 ◦C and 200 ◦C. The boards were tested for internal bonding, modulus of rupture and thickness swelling. All tests were carried out according to the appropriate European standards. Results showed that mechanical and physical properties were considerably improved by addition of 18 % water at temperature 180 ◦C. According to scanning electron microscope images, it can be concluded that this self-adhesion is based on the melting and flowing processes of some amorphous polymer materials such as lignin and carbohydrate. In addition, scanning electron microscope images showed that in particleboard sanding dust there is nano-sized particles, which play an important role in bonding quality. Continuous reaction of resin urea-formaldehyde in higher press temperature is another reason for increasing strength.