As methods of preparation, many technical such as degradation of lignocellulose materials, organic synthesis, the reinforcement of composites et al. have been introduced into self-bonding technology. According to different treatment, pretreatment methods have been divided into three categories: Physical method, chemical method and biological method. According to different mechanisms, each method is further classified. The types and action mechanism of pretreatment were summarized. Physical pretreatment usually have various degrees impact on the bonding strength but weak controllability, while chemical pretreatment have obvious effect on the bonding strength increased but serious pollution. Biological pretreatment is a promising but immature technology. By comparing the advantages and disadvantages of different methods, Feasibility of combined application of different methods is analyzed. Finally, the development foreground of pretreatment techniques in self-bonding composites is predicted based on the current research.

The Research Progress in Pretreatment Techniques of Self-Bonding Composites

Cotton stalk fibers were obtained through the steam-explosion pulping process and binderless fiberboards were produced from the fibers without any chemical additives. The effect of steam-exploded pressure on fiber dimension,chemistry components,and board properties was investigated in this paper. The results showed that higher steam pressure produced finer fibers with higher sugar,acids,and higher alcohol contents. It was also observed that the internal bonding strength of the binderless fiberboard was improved under higher steam exploded pressure. However,the mechanical property of the board decreased as steam pressure was increased.

Wang Si-min

Papers

Effect of Steam Pressure on Binderless Fiberboard Made from Cotton Stalk