METHOD FOR ADJUSTING COATING WEIGHT BY GAS WIPING

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...

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Bibliographische Detailangaben
Hauptverfasser:	ANDACHI, KAZUNARI, SHIGEMOTO, HARUMI
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY PERFORMING OPERATIONS PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL SPRAYING OR ATOMISING IN GENERAL SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING
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Beschreibung
Zusammenfassung:	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.xKxPA1/2 x D1/2 x (.mu.xV/{(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 A1/2 x (D/B1/2)x[.mu.xV/{(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, .mu.: viscosity of molten metal, P A: pressure at nozzle outlet, .pi.: nozzle efficiency, K: specific heat ratio of gas, h1 and h2: constants).