The Mechanism And Manufacturing Technics Of Castor Stalk Based Board

The Castor oil plant (Ricinus communis L.) is sole species of the spurge family. It is perennial or annual woody herbage. There are significant differences in characters of castor stalk and its different parts. The xylem of the castor stalk is diffuse-porous wood and has medium-length good configuration fibres. The physical-chemical properties of the castor stalk are well, the pH value is acidity, the relative crystal-degree is 63.27percent, and the SiO2 content is less. So the Castor stalk is a good woody material and can be used to make man-made board, paper and the like.Research on making castor stalk based particle board and comparative study of the properties of one hundred particle boards produced by corresponding different hot-press techniques. The objective of this is to choose the best techniques from the above. Considering the cost of man-made board,the properties and production efficiency of the board produced by the hot-press technique chosen, and get the hot-press temperature is 150 centigrade, the hot-press time is 30 second per millimeter and the resin added is 12 percent. Produced by it the properties of the castor stalk based particle board with 1.44 percent wax added and the castor stalk based fibre board with 1.2 percent wax added both can exceed the requirements of the PRC Standards for Particle Board and Fibre board respectively. The properties of castor stalk based board are increasing with the density increasing of the board. Besides, the results show that the properties of castor stalk based board and poplar wood based board made by the same techniques are comparable. The marrow of the castor stalk contains parenchyma cells mainly and it has disadvantage influence on the properties of the stalk based board. So it can be got rid of when the castor stalk are used in industry. But it can be used in making heat insulating material, packing pad and so on.It suggests one method for Collection of raw materials and three modes for castor stalk industrial use in China because castor stalk has regional and seasonal characteristics. Producing castor stalk based board can decrease the air pollution caused by stalk burning, increase the income of farmers in China, protect the forestry resources of China, and decrease the cost of man-made board. If the half of the castor stalk produced now will be used in industry, and the 100000ha forestry will be protect per year.