Study On The Basis Of Board Manufacture Of Chip Unit Of Three Kinds Of Shrubs In Desert

This paper studied structure, fiber morphology and properties (acid and alkali) of three shrubs. It measured density, shrinkage ratio, compressive strength parallel to the grain, modulus of rupture. And chips of three shrubs were tried to make the board .It also measured physico-mechanical properties of the board. Moreover, it analyzed advantages and disadvantages of board, and factors of influence on board properties. The result is as the following: Firstly, fiber morphology of three shrubs is good and content of cellulose is high. So they are high-quality materials for pulping, fiber board and particle board. Secondly, the three shrubs are of weak acidity (pH: 5.27-5.48). The curing time of UF increases with the increase of wood pH and alkali buffering capacity. Thirdly, the basic density value of three shrubs is 0.445-0.551 g/cm3. On volume shrinkage ratio, the ratio of tangential shrinkage, ratio of radical shrinkage and compressive strength parallel to the gram of three shrubs, Salix cheilophila is the biggest of them. Salix psammophila is the smallest of them. Modulus of rupture of Salix cheilophila is bigger than Salix psammophila. Moreover, their physico-mechanical properties, the ratio of horizontal shrinkage, and compressive strength parallel to the grain increase with the increase of density. Finally, the mechanical strength of three shrubs is high. Their static bending strength is 22.65 MPa (Salix psammophila), 20.80 MPa (Salix gordejevii), 18.78MPa (Salix cheilophila), and their internal bond strength is 0.69MPa (Salix psammophila), 0.55 MPa (Salix gordejevii), 0.54 MPa (Salix cheilophila) respectively.