A Study On The Main Factors Effecting The Function Of Salix And Gypsum Particle Board

The main factors which have great effect on the character of salix and gypsum particle board were analyzed through three experiments which were directed respectively at the influence of the extractive of salix in water on the hydrating of gypsum, the influence of the density of the board and the proportion the material on the character ,and of the influence of the size of the board on the character of the board. The extractive of salix in water is a kind of strong retarder in the process of the hydrating of gypsum. With the increasing in the mount of the partied, the time of beginning and ending of gypsum congealing delayed. Furthermore, the extractive has more significant influence on the postponing of final congealing than on the beginning congealing. Both sodium-citrate and NaCl are desirable stabilizer to the hydrating of gypsum. Given that the proportion of wood to gypsum is fixed, the time on which gypsum first congeals and the amount of NaCl added present a linear relationship. Nevertheless, there isn't linear relationship between the amount of sodium-citrate added and the time on which gypsum first congeals. The regressing equations are listed as followings: Y=58.6+900X (wood/gypsum ratio:0.15) Y=63.2+900X (wood/gypsum ratio:0.20) Y=68.8+900X (wood/gypsum ratio:0.25) It is suitable to adopt the "postponing-congealing technique". The optimal arts and crafts condition are:ρ=1.30g/cm3H/G=0.15W/G=0.30 Using this kind of technology, the character of the product, salix and gypsum particleboard can reach the level of the same kind of product abroad. The density of board, the proportion of wood to gypsum and the proportion of water to gypsum are the main factors, influencing the character of salix and gypsum particleboard greatly. With the increasing of the density, the intensity of the product rises significantly. There are parabola relationships between the ratio of wood to gypsum and forniciform intensity and between ratio of water to gypsum and fornicform intensity. The second scheme mentioned in the paper is more fit to produce the particleboard of salix and gypsum. The proper subsequence shows as the followings:Salix material chipper double-tub-wheel-flaker wind-selecting-disbark-machine hammerrefiningwind-selecting-disbark machine three-layer-swinging screen qualified screen-circle-muller disqualified...