Study On Middle Density Fiberboard Production Of Triarhena By Coriolus Versicolor

The fiberboard produced with adhesion agent releases methanol which not onlypollutes the environment but also does a great harm to the persons，The development ofnon-adhesive fiberboard has become a hot and difficult international question. the methodof biological fermentation is used in this thesis to produce the non-adhesive fiberboard.The study includes: the building of fermentation system、optimization of fermentationprocess and hot-pressing process, the strengthen of fiberboard performance. Finally, themechanism of biological fermentation as well as open fermentation process werediscussed, The main conclusions of the paper are as follows：.The preparation of fermentation system shows that the optimal system is CoriolusVersicolor. AWO60plus triarhena. The MOR of the fiberboard produced by triarhenawith solid fermentation pretreatment of Coriolus Versicolor.AWO60reached5.12MPaand the MOE reached1440MPa. Both of the index are optimal.The optimized fermentation parameters obtained from the optimization fermentationprocess are as follows: the ratio of material and water is1:3, fermentation time is14days.The MOR and the MOE reached10.12MPa and2860MPa. The optimum pressingconditions obtained optimizing hot-pressing process are as follows: temperature is185°C,time is8minutes, pressure is10MPa. The MOR and the MOE reached13.76MPa and3610MPa. The size of raw material and density of fiberboard are also researched to get theoptimim mechanical properties. The MOR and the MOE reached18.12MPa and4250MPawhen the sieve used for screen is100-mesh and the density of the fiberboard is0.908g/cm~3. The MOR improved2.47times meeting the national standards and MOEimproved1.95times closing to the national standard.Further research are made to explore the mechanism of biological fermentation non-adhesion. Sugar and activity of laccase have positive correlation with the mechanicalproperties of fiberboard through component analysis. The results from the electronmicroscope showed that surface structure of triarhena is destroyed, the surface becamerough after the fermentation treatment and a lot of fine pores appeared on the surface. Allthese changes of structure were benefical to adhesion of fiberboard.Finally, The primary exploration of open bio-fermentation is discussed. Open culture initially reached through precondition with steam treatment and5%lime soaked. TheMOR and the MOE reached5.76MPa and1130MPa with open culture after steampretreatment1h. The mechanical properties were close to the properties processed throughsterilization process without processing optimization.The thesis select the triarhena as raw material. The middle density fiberboardproduced by combination white rot fungi solid fermentation and hot-pressing providetheoretical and technical foundation for non-adhesive fiberboard.