Development of Binderless board

红麻无粘结板是红麻核心部分的有效利用途径之一，红麻核心部分是废弃的生物质资源之一。结果表明，在高温下，无粘结剂板的耐水性优于脲醛树脂和脲三聚氰胺甲醛树脂板。并观察到无装订板在户外曝晒试验一年内无严重劣化。此外，热软化木质素、游离羧酸形成化学键以及木质素中缩合结构的增加被认为在自键机制中起重要作用。相比之下，木质素在热压过程中的糠醛和单体间键的断裂对自键的贡献很小。针对无装订板的制造条件，由于压制压力和温度与木质材料相同，建议采用常规的纸板制造条件和设备生产无装订板。在未来，无装订板将成为有效利用生物质废弃物的重要目标，特别是在发展中国家，人们没有或有限的木材资源，没有足够的化学工业，而农业残留物过剩。

Kenaf binderless board has been developed as one of the effective utilization for Kenaf core part which is one of the abandon biomass resources. As the result, at high pressing temperature the water resistant properties of binderless boards were higher than for boards bonded with urea formaldehyde or urea melamine formaldehyde resins. And it was observed that there was no severe deterioration in the binderless board under the outdoor exposure test for one year.Moreover, thermal softening lignin, chemical bonds formed by free carboxylic acid, and increases in condensed structure in lignin were considered to be playing important role in the self-bonding mechanism. In contrast, furfural and cleavages of intermonomer linkages in lignin during the hot pressing process showed little contribution to the self-bonding.Concerning the manufacturing condition for binderless board, it is suggested that usual board manufacturing condition and device can be applied to produce the binderless board since pressing pressure and temperature is same as that of wood-based materials.In the future, binderless board will be become an important target for effective utilization of biomass waste, especially in developing countries where people have no or limited wood resources and no adequate chemical industries but a surplus of agricultural residues.