摘要:Pinus tropicalis, P. echinata, P. elliottii and P. latteri are fastgrowing pine trees in the tropical and subtropical regions. They are introduced and growing well in Zhanjiang Prefecture, Guangdong Province. A comparison is made among the wood anatomical-mechanical properties of 20-year-old P. tropicalis, P. elliottii, P. latteri and 10-year-old P.echinata grown on the same site. The results of this study show that they all belong to the hard pine group and the properties of the former 20-year-old pines are better than that of the latter 10-year-old one (P.echinata). These four pine species can be used for paper making before 15 years old and the mature trees can be used just like the hard pines native to China. Besides, they can be considered as resin-tapping trees suitable to develop in South China.
摘要:Oxygen Index, Smoke Density and Char Length of APP treated Pinus massoniana were measured before and after aging. The relation between impregnating level of fire retardant and non-combustion areas was described in this paper. Fire retardancy of APP treated wood meets Class Ⅰ according to JIS D 1201-77 and JIS A 1322-75. Fire test of formulated small wood house was compared with untreated small wood house. The result showed that APP treated wood can be used for interior room.
摘要:Press is one of the main machines in wood-based panel production. Its mechanical design mainly includes calculation of the ridigity and strength of frame, reasonable arrangement of frame in longitudinal direction, calculation of bending moment, tension and compression stresses exerted on upper and lower platens, relation between location of cylinders and ridigity of the upper platen. These calculations involve so many factors, each of which can effect the final result. So we should treat the data by computer so that the best design could be found quickly with no error.
摘要:On the basis of theoretical analysis, this paper introduces design calculation methods for aerostatic guide, including guide-block dimension, compressed-air flow expenditure, guide-block air-film bearing capacity and its rigidity, and air entrance diameter. A calculation example has been given. The design data for construction is also provided.
摘要:For beginning the research on cutting properties of the important Chinese wood species, the results from the previous research in this field are briefly reviewed and Some problems deserving consideration are discussed.
摘要:In China, the market of domestic wood based panels was in a recession two years ago. As a result of continual increase in the demand for furniture, wood based panels, as a primary material of furniture products, have commanded a ready sale, even have shown the tension of supply since 1986.Five to ten years from now on, particleboard industry will develop rapidly in our country. For the extension of the market and the application of particleboard, the potential market of the rural areas should be exploited actively and the application of particleboard as a structural component in the building industry should be explorited.The major problems regarding the application of particleboard are quality of the board (that is the property of the board), secondary finishing and selling price. It is necessary to set up various standards and guide specifications according to the requirements of application as well.
摘要:This paper is a review of part of fruitful research papers in the world about the notable problem of formaldehyde emission from wood-based panels produced with UF resins. In the paper, hazards and mechanism of formaldehyde release are explained as well as advanced controlling means and determination of emitted formaldehyde, in order to search for an effective and appropriate way to decrease formaldehyde emission from wood-based panels in China.