Abstract:

Based on many results from experiments,the paper discussed the effects of 12 main factors of manufacturing particleboard on the thickness swelling and irreversible thickness swelling,which are hot-pressing temperature,hot-pressing time,hot-pressing pressure,density,moisture content of particles,resin consumption,wax consumption,adhesive species,particle geometry,particle species,particle pre-treatment and double pressing for particleboard.It showed that the reduction of 24 h TS of particleboard is by way of reducing its ir TS.And the essence of reducing ir TS is to release the internal stress by mains of discharging Non-expansion-work energy,to lessen the quantity of visco-elastic deformation and to decrease the destuction of bonding points.It aslo showed that all main factors except wax consumption have great effects on ir TS of particleboard,as a result,it is very important to choose the right conditions for manufacturing the particleboard with good demension stability.

Key words: Particleboard, Deformation in thickness, TS, ir TS