DRYING MECHANISM OF COATED FILM OF POLYMER SOLUTION

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  • OKAZAKI MORIO
    Department of Chemical Engineering, Kyoto University
  • SHIODA KATASHI
    Department of Chemical Engineering, Kyoto University Mitsubishi Chem. Ind., Ltd.
  • MASUDA KEIZO
    Department of Chemical Engineering, Kyoto University Toray Ind., Ltd.
  • TOEI RYOZO
    Department of Chemical Engineering, Kyoto University

Abstract

Drying of coated film of polyvinylalcohol (PVA) aqueous solution is studied theoretically and experimentally, focusing on the diffusion process of water and the volumetric shrinkage of film occurring by evaporation of water. The diffusion coefficients were measured over the whole range of concentration by three methods, and drying experiments of coated films using hot air were performed. Numerical solutions were obtained from a set of transport equations for water using the observed diffusion coefficients and were compared with the experimental results.

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