A typical coating solution is made up of a polymer, plasticizer, solvent and in some
cases pigment. Only a proper combination of these four components will achieve a
coating solution with a desired property. For example, although a higher solution
concentration may lead to a faster coating deposition, the concentration is limited to a
range where the solution remain sprayable and easy to dry. There have been several
studies on the characteristics of the coating formed with different combinations of
ingredients. Lehmann and Dreher (1981) showed that, even under similar physical
conditions, the change in size and/or concentration of the coating material will
produce coatings of different sizes and different characteristics. Early work by
Schaefer and Worts (1978) and later studies by Smith and Nienow (1983) showed
the effect of amount and concentration of the coating solution on the final product.
Most of the studies in this area, including those of Horváth and Ormós (1989a),
Laicher et al (1993) and Link and Schlünder (1997), have concluded that the quality
and quantity of the coating solution affects the characteristics of the final product.