Method for adjusting coating weight by gas wiping

B - Operations – Transporting – 05 – D

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B05D 1/40 (2006.01) B05D 3/04 (2006.01) C23C 2/20 (2006.01)

Patent

CA 2139119

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 p M x {(K-1)/(2x.pi.xKxPA)}1/2 x D1/2 x (µxV/{(P/P A)(K- 1yk-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 = h2 x p M x {(K-1)/(2x~xKxP A)}1/2 x (D/B1/2)x[µxV/{(P/P A)(K-1)/k-1}]1/2, so as to regulate the adhesion quantity of a molten metal (coating material) (p M: density of molten metal, µ: viscosity of molten metal, P A: pressure at nozzle outlet, .pi.: nozzle efficiency, K: specific heat ratio of gas, h1 and h2: constants).

Les formules pour déterminer la quantité d'un placage adhérant à un feuillard sont établies séparément en fonction de la relation entre l'écart buse/feuillard (D) et la largeur (B) de l'ouverture de la buse, et on utilise ces formules pour régler à l'intérieur d'une plage de travail large la quantité de matériau de placage adhérant au feuillard. La pression (P) de la buse et la vitesse (V) du feuillard sont fixées, et D est fixé au moyen de la formule (1): W = h1 x rhoM x {(K-1)/(2xetaxKxPA)}1/2 x D1/2 x [muxV/{(P/PA)(K-1)/K-1}]1/2, lorsque D/B Í C (région d'expansion). Lorsque D/B > C (région de développement complet), on utilise alors la formule (2): W = h2 x rhoM x {(K-1)/(2xetaxKxPA)}1/2 x (D/B1/2)x[muxV/{(P/PA)(K-1)/K-1}]1/2, pour fixer au moins une des valeurs D et B, afin de régler la quantité de métal en fusion (placage) adhérant au feuillard. Dans ces formules (1) et (2), rho représente la densité du métal en fusion, mu représente la viscosité du métal en fusion, PA représente la pression à la sortie de la buse, eta représente le débit de la buse, K représente le rapport des chaleurs massiques du gaz, et h1 et h2 représentent des constantes.

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