Study On New Manufacturing Technique Of Binderless Fiberboard And Industrial Production

This paper is a part of item: study on new producing technique of green fiberboard, with a serial number of 2004C22038, which is one of Zhe Jiang province technological program key projects. A new manufacturing technique of binderless fiberboard was investigated through experimental test in lab and industrial producing test in the current product line of medium density fiberboard at the present of a kind of acid catalysts, using wood as raw material.The main principles of binderless fiberboard manufacturing new technique are as follows: Without adhesive, at the present of few acid catalysts, carbohydrate and phenols with a low molecular are obtained by fractional degradation of cellulose, hemicellulose and ligin in the defibrator using the steam with a high temperature and high dampness existing in the preheated kettle, followed by a series of chemical reaction in the hot-press, and finally a kind of agglutination products are formed, which make glue fiber to form fiberboard.Orthogonal test design and single factor test design was applied for the test of binderless manufacturing technique. Result indicates that: the properties of binderless fiberboard are influenced by the amount of acid catalyst, the mat moisture, the hot-pressing pressure, the hot-pressing pressure, the hot-pressing temperature, the mat core temperature and so on. Optimal producing techniques are as follows: the amount of acid catalyst is 0.5%, the mat moisture of 10%, the hot-pressing pressure of 3.0 MPa, the hot-pressing temperature of 200℃and the mat core temperature of 140℃. This board-making technique is easy to operate at the optimal technology. The physical mechanics of the product obtained accord with the requirement of common board which is prescribed by industry standard (LY/T1611-2003) in the book“fiberboard for the base material”.The bonding mechanism of binderless fiberboard is investigated by chemical analyses and FTIR to analyze the changing rules of the raw material’s main components and functional group in the manufacturing process of binderless fiberboard; X radical diffraction is applied to analyze the changing rules of cellulose crystallinity in the manufacturing process of c; The pyrolysis changing characteristics in the manufacturing process of binderless fiberboard is analyzed by Thermal analysis; The fire-retardation performance of binderless fiberboard is studied by CONE.