| abstract |
(57) [Summary] [Problem] To be able to reliably remove bubbles in a coating solution irrespective of the properties of the coating solution, to process a large amount of the coating solution, and to improve the quality of the coating solution after defoaming. There is no adverse effect. First, the total amount of bubbles in a coating solution is reduced by deaeration under reduced pressure performed together with preparation of a coating solution in a stirring tank 14A in a first step, and then a floating tank in a second step. In the 16A, relatively large bubbles among the bubbles that were not defoamed in the first step are defoamed by a tank-type defoaming device, Finally, in the pipeline 18B of the third step, the first In the second step, bubbles having a small diameter to a small diameter, which are difficult to be defoamed, are dissolved in the liquid under pressure and defoamed. |