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Laser monitoring of non-Newtonian liquids during dip coating

Authors

  • Alexandre F. Michels,

    Corresponding author
    1. Centro de Ciências Exatas e Tecnologia, Universidade de Caxias do Sul, CEP 95070-560, Caxias do Sul, RS, Brazil
    • Centro de Ciências Exatas e Tecnologia, Universidade de Caxias do Sul, CEP 95070-560, Caxias do Sul, RS, Brazil
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  • Pedro Lovato,

    1. Instituto de Física - Universidade Federal do Rio Grande do Sul (UFRGS), Campus do Vale, CP15051, 91501-970, Porto Alegre, RS, Brazil
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  • Flavio Horowitz

    1. Instituto de Física - Universidade Federal do Rio Grande do Sul (UFRGS), Campus do Vale, CP15051, 91501-970, Porto Alegre, RS, Brazil
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Abstract

Dip coated films, widely used in the coating industry, are usually measured by capacitive methods with micrometric precision. In this work, interferometric determination of thickness evolution in real time, for the first time to our best knowledge, is applied to volatile non-Newtonian liquids with several viscosities and distinct dip withdrawing speeds. Thickness evolution during the process depends on time as predicted by a power law model. Comparison with measured results (uncertainty of ± 0.007 μm) showed very good agreement after initial steps of the process. © 2009 American Institute of Chemical Engineers AIChE J, 2009

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