Thin Film Formation by Direct Reverse Roll-Coating on Plastic Web

概要

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The formation process of thin films on plastic webs by a Newtonian fluid was examined for the direct reverse roll-coating (D-RRC) system. An applicator roll having concavities arrayed with an interval of 0.2 mm on the surface was used for the coating. The thickness of coated films was determined as a function of speed ratio $r_{\text{s}}(=v_{\text{f}}/v_{\text{r}})$, where $v_{\text{r}}$ is the running speed of the applicator roll and $v_{\text{f}}$ is that of the web in the range of $0.02\leq r_{\text{s}}\leq 1.8$. It was found that the thickness of the coating film was increased markedly with the ratio $r_{\text{s}}$ in the range of $0.02\leq r_{\text{s}}<0.5$ and gradually approached a constant value in the range of $0.5<r_{\text{s}}$. These experimental results fitted well with theoretically calculated results based on the lubrication theory.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-09-15