Hot-pressing techniques of plywood manufacture with modified soybean protein adhesives.

Using an orthogonal method,this study investigated the bonding strength of plywood made by modified soybean protein adhesives under different experimental conditions such as hot-pressing temperature,time,pressure,and amount of adhesives.The results indicated that the bonding strength of plywood increased significantly when hot-pressing temperature increased from 130 to 160℃,or when hot-pressing time increased from 30 to 60?s?mm,or when hot-pressing pressure rose from 0.6 to 1.0?MPa.After 1.0?MPa,the rising tendency of the bonding strength slowed down.The plywood achieved a maximum bonding strength at the amount of adhesives of 310?g?m~2.The optimum technological parameters are suggested as follows: hot-pressing temperature 160℃,hot-pressing pressure 1.2?MPa,hot-pressing time 60?s?mm,and amount of adhesives 310?g?m~2.