It falls the curtain coating method and the curtain which

摘要

PROBLEM TO BE SOLVED: To provide a curtain coating method carried out by falling down a curtain 10 comprising a plurality of layers of liquid films and applying a plurality of layers of films on the surface of a travelling board 11 wherein the liquid film layer comprises a broad layer 12 and narrow layer 13 and a film thinning phenomenon that the thickness of a part of the film is made thin to form a thinned film part 14 does not occur.;SOLUTION: In the curtain coating method, the narrow layer 13 comprises a solution of a high molecular material having a molecular weight of 3,000-30,000, the broad layer 12 comprises a solution of a high molecular material having the molecular wight of 10,000-30,000, a factor Z is determined by following formula (4a) and the relationship between the molecular weight of the broad layer 12 and Z satisfies following formula (1b) and the relationship between the molecular weight of the narrow layer and Z satisfies following formula (2b), that are (1b); Z≤Y1=A1×broad film molecular weight+B1 (2b); Z≤Y2=A2×narrow film molecular weight+B2 and(4a); Z=Z1=-10×(broad film surface tension - narrow film surface tension)+9.;COPYRIGHT: (C)2006,JPO&NCIPI