| 摘要 |
<p>Relational formulas for determining an adhesion quantity of a coating material are separately set in accordance with a relative relation between a nozzle-strip gap D and a nozzle slit gap B, and the adhesion quantity of the coating material is accurately regulated over a broad operation range using the relational formulas. A nozzle pressure P and a strip speed V are controlled, and D is controlled using the formula (1): W = h1 x ςM x {(K-1)/(2xθxKxPA)}?1/2 x D1/2¿ x [νxV/{(P/P¿A?)?(K-1)/K-1}]1/2¿, when D/B « C (expansion region). When D/B > C (complete development region), on the other hand, at least one of D and B is controlled using the formula (2): W = h¿2? x ςM x {(K-1)/(2xθxKxPA)}?1/2 x (D/B1/2¿)x[νxV/{(P/P¿A?)?(K-1)/K-1}]1/2¿, so as to regulate the adhesion quantity of a molten metal (coating material) (ς¿M?: density of molten metal, ν: viscosity of molten metal, PA: pressure at nozzle outlet, θ: nozzle efficiency, K: specific heat ratio of gas, h1 and h2: constants).</p> |
