| Since Natural Forest Preservation Project carried into execution, the large-diameter finelogs are decreasing day by day in China. It is very anxious to develop new wood-based panelsmade by the inferior wood, short ends, fuel wood or the residual of reforest, afforest andthinning. Thus developing new board named Micron Flaky Wood Fiber Light Density Board,short for MLFB, which possessed of independent intellectual property, made it to be possibilitythat small wood is utilized for large purpose, inferior wood used as superior wood and wastewood is also of availability. It filled a vacancy in national wood industry field that developinglight density board with micron wood fiber machininged not by hot grinding but by micro-technology, all these researches would propel the national economy and socioeconomicdevelopment.Nowadays, it has become the leading research field in wood products industry to replacethe light wood-based panels produced by traditional processing technology with the productsproduced by micro-technology, as well as the series of correlative problems, because the newlight wood products by micro-technology have many advantages such as lower pollution, lowercost, lower density, fine qualities etc., and are applied in construction and decoration.In this dissertation, it is defined that Micron Flaky Wood Fiber Light Density Board, shortfor MLFB, is a new light density board relying on micro-technology with precision mechanicalequipment, independent intellectual property, little limits in raw material density and quality,and 0.3～0.45 g/cm~3 in density as well.Based on the research of National Natural Science Foundation of China Research onCell Reconstituted Mechanism of Forming Super Strength Orient High Density Board withWood Micro-fiber, further research were as following:Analyzing the splitting course of single wood fiber cell under certain cutting thicknessconditions furtherly, the typical shapes of single cut wood fiber cell were obtained and themathematical description theory of the typical shapes also carried out as well. Based on abovemathematical descriptions, the experiment equipment was designned and manufactured formachining the micron wood fiber of MLFB speciallly, which provided a necessary conditionfor developing micro&nano-technology wood products. In order to optimize and improve onthe experiment equipment, simulation analysis of the critical component was processed byANSYS software. Based on composite micro-mechanics, wood cytology and computer imageprocessing technique, the microstructure mechanism and strength predication of MLFBprocessed with micron wood fiber were studied, which provided a new research method inwood-based panel mechanics research instead of the traditional mechanics theory, and propelled the wood-based panel research into microcosmic level as well. Mathematical modelof the typical configuration of micron wood fiber was established according to the micronwood fiber processing theory submitted in this dissertation, then computer simulation of MLFBmanufacture process with OpenGL and VC++6.0 was studied, and also the two correlativesoftware were developed domestically for the first time, which breakthoughed the traditionalprocessing technology with long time and hardwork, then developed a new method inconstructing, designning, also optimizing new panel by composite micromechanics.Finally the research of processing technology of MLFB was completed in laboratory, andthe correctness of MLFB theory was verified. By trial test, orthogonal test and comprehensivetest, the effects of the four parameters resin content,hot tempreture,hot time,hot pressure onMOR, MOE, and nailholding power were studied, and the optimized processing parameters ofMLFB were obtained. MLFB specimen in laboratory were density in 0.275～0.45 g/cm~3, withwooden colour, and the mechanical properties met with Japan Light Particleboard IndustrialStandard JISA5908.
|
PDF Full Text Request