An experimental simulation model for coated paper drying

Abstract

-Due to the lack of information regarding the phenomena of mass, heat, and momentum transfer in coated paper drying, substantial research work still needs to be done. A simulation model for coated paper drying is introduced which integrates heat and mass transfer mechanisms. In the model, the coated paper was assumed to have 3 layers (coated layer, wet and dry layers of the base paper), in which the thickness of each layer is a function of drying time and condition. The thickness of the wet layer of the base paper was considered to be a function of water permeability rate that in turn is a function of the moisture diffusion coefficient, time and drying rate. Movement of vapor resulting from evaporation in the middle layer was assumed to be a combination of laminar bulk flow and molecular diffusion. Radiation absorption was used as a diminishing exponential model, which depends on moisture content. Hot air and super heated vapor were used as drying fluids. Functional variables were temperature, drying fluid velocity and delay time. To verify the simulation results two compositions were applied for the coating suspension. The simulation results matched well with experimental outcomes.

The Influence of Drying Conditions of Clay-Based Polymer Coatings on Coated Paper Properties

“…The coating binder has a high impact on printability [18][19][20]. This can be correlated with the drying rate which controls the coating layer dewatering and their structure.…”

“…The paper printability is influenced by coating surface properties, mainly by pores size and their distribution, which have an important role on the paper-ink interactions. The coating binder has a high impact on printability [18][19][20]. This can be correlated with the drying rate which controls the coating layer dewatering and their structure.…”