Eucalyptus wood fiber was prepared to investigate the effects of alkaline treatment on mechanism of extrusion bonding of the board.The results showed that: 1.Hemi-cellulose and lignin were partly degraded during eucalyptus wood fiber were treated with alkali.2.These degraded substances could be copolymerized during hot-pressing.3.The influence of alkali (NaOH) on eucalyptus wood fiber is greater than the weak base(Na2CO3), and the processing time for 10 h is more appropriate.4.The increased hydroxyl after defibrinating partly formed hydrogen-bondin...