| 摘要 |
PURPOSE:To prevent the contracted flow of a coating liquid from the position upper than the bottom end of the guide rod of a free falling coating liquid film and to uniformize the film thickness distribution at both ends in the transverse direction of coating by specifying the radius of curvature of the section at the front end of an edge guide or the thickness of the section at the front end thereof to a specific value according to the viscosity and/or dynamic surface tension difference of the coating liquid. CONSTITUTION:The coating liquid is applied by widening the liquid contact surface of the edge guide 3 to regulate the radius (r) of curvature of the section at the front end to >1.5mm or the thickness (d) of the front end at the front end to >1.0mm in the case of >45cp viscosity of the coating liquid (mu) and/or >8 dymanic surface tension of difference (>=sigma) and by narrowing the liquid contact surface of the edge guide 3 to regulate the radius (r) of curvature to <1.5mm and the thickness d to <1.0mm in the case of <45cp viscosity (mu) of the coating liquid and/or <8 dynamic surface tension difference (>=sigma). The coating liquid is applied by adjusting the viscosity and the dynamic surface tension difference so as to meet the above-mentioned values if the radius (r) of curvature or the thickness (d) is already determined. Consequently, the constracted flow of the coating liquid from the position upper than the bottom end of the guide rod of the free falling coating liquid film is prevented.
|
