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Experiment on Wavelength and Depth of Ribbing Generated in Roll Coating.

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  • ロールコーティング時に生ずるしまの間隔と深さに関する実験的研究
  • ロール コーティングジ ニ ショウジル シマ ノ カンカク ト フカサ ニ カ

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Abstract

An experiment has been made on ribbing induced on a film coated over a roll surface in coating by means of a two-roll system, one roll rotating and the other fixed. Wavelength and depth of the ribbing are measured by a newly developed technique utilizing an image reflected on the ribbed film surface by a straight bar, and the following are clarified. Non dimensionalized wavelength is correlated with capillary number for Newtonian liquids, but it takes higher values for several viscoelastic liquids used. Viscoelasticity of the liquid has an effect of increasing the depth of ribbing, that is, the depth takes the value of 0.04mm to 0.1mm for Newtonian liquids, but 0.07mm to 0.2mm for viscoelastic liquids. The wavelength of spatial perturbations generated on the meniscus at the exit of the clearance between the two rolls coincides with the wavelength of the ribbing seen over the roll surface. This means that the perturbation of the liquid generated just after passing through the clearance is carried with rotation of the roll and results in the ribbing over the roll surface.

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