The Preliminary Study On The Hot-pressing Of Fiberboards By White-rot Fungus Pretreatment

As anew material forfiberboard production,theutilizationofstraws canreducetheconsumption of wood resources and increase the economic efficiency. However,formaldehyde in the adhesive can be released to the environment due to the adhesiveusage in fiberboards production. Bio-pretreatment is a good method to relieve this statusand reduce the energy consumption in fiberboards production process. This paperpreliminarily studies a bio-pretreatment method for fiberboards production and itsmechanism.Itcouldprovideacorrespondingreferencetothelateresearches.The feasibility of fiberboard manufacture pretreated by the white-rot fungi wasinvestigated. A set of new suitable hot-pressing mould was designed and the besthot-pressing condition was tested. The fiberboards were successfully manufactured. Theresults showed that bio-pretreatment could make the modulus of elasticity in staticbending (MESB) and bending strength (BS) reach to 360.59 MPa and 2.27 MPa,respectively.The pretreatment mechanism about how to enhance the fiberboard strength wasalso studied. It was found that the content of sugar with the adhesive function wasincreased. There was positive correlation between the fiberboard MESB and sugarcontent as well as laccase activity. At the same time, the strength of fiberboards could beenhanced by the cellulose crystallinity by bio-pretreatment, and the pretreatment coulddestructthesurfacestructureofcornstraws.The most optimal strain Trametes hirsute.TH was obtained. Cultivated with copperionconcentration10mmol/L(pH=9.5)andratioofmaterialtowater1:3for14days,theproduction of laccase was greatly optimized. Followed by the condition, the fiberboardswere manufactured. The MESB reached up to 436.09 MPa with the BS of 3.01 MPa,whichwasincreased21%and19%comparedwithunoptimization,respectively.