“…where ρ 1 is the roller steel density, kg/m 3 ; λ 1 is the heat conduction of the roller material, W/(m•K); c 1 is the specific heat capacity of the roller material, J/(kg•K); ρ 2 is the density of the belt material, kg/m 3 ; λ 2 is the heat conduction of the belt material, W/(m•K); c 2 is the specific heat capacity of the belt material, J/(kg•K); [25,26], we obtain:…”