KAGAKU KOGAKU RONBUNSHU, Vol.34, No.2, 266-276, 2008
Drying Characteristic Model for Water-Based Polymer Coated Film Considering Mass Transfer Acceleration by Drying Stress
The author's previous drying characteristic model for planes with Fickian mass transfer was modified by taking into consideration the sensible heat and the penetration period. A new drying characteristic model incorporating the acceleration effect of the mass transfer caused by drying stress was proposed on the basis of the modified model. The drying characteristic model may be modified easily for a new material and be suitable as a general drying model for multiple materials. Performance of the new model was examined by comparing the results with experimental results and simulated results obtained with a Fick-type diffusion equation for polyvinylalcohol aqueous solution film in a previous study Drying rate curves calculated with the new model showed quantitative agreement both with the previous experimental results and with the simulated results that had not agreed with the experimental ones. Results calculated with the new model for an imaginary gel film showed qualitative agreement with experimental results for gelatin gel film obtained in another previous study. A large difference between the simulated drying rate with and without the acceleration effect by the new model for a coated layer thickness of factory production level was found during the final stage of drying process.