Abstract:

Based on many facts of experiments, this paper demonstrated and filtered all factors affected the thickness swelling of particleboard after considered them in care, and founded the equation model for thickness swelling of particleboard, that's TS(t)=F(t)+f(M .C ,t)+V(t) It means that the thickness swelling comes mainly from the recovery of visco-elastical deformation of wood in particleboard, hygroscopical swelling of wood in particleboard and deformation caused by destroyed glue lines between particles. When the change of moisture content in the board is rather great or obvious, the mechano-sorption creep item A(M .C ,t), shall add to the model.

Key words: Wood composite, Deformation in thickness, Equation model, Internal stress