| 摘要 |
PROBLEM TO BE SOLVED: To provide a spray disc, a spray apparatus and a spray dryer capable of controlling variation in particle diameters of particles. SOLUTION: In the spray disc 34 according to the present invention, a stock solution fed near a center portion of an upper and lower mounting disc 50 flows in a peripheral direction of the upper and lower mounting disc 50 and then moves upward along a circumferential surface 62a of a spraying roller 62 to be made in film form, and thereafter the stock solution made in film form is sprayed outwardly from the upper and lower mounting disc 50, wherein a upper flange portion 66 is annularly overhung from an upper mounting disc 52 and therefore at least a part of droplets of stock solution impinges on the upper flange portion 66, and upon impingement, droplets having a relatively large diameter are crushed to droplets having a smaller diameter by the impingement shock, and consequently the droplets are reduced so that variation in diameters of the total droplets is controlled. Accordingly, the control of variation in particle diameters of particles obtained can be achieved by using the spray disc 34. COPYRIGHT: (C)2007,JPO&INPIT
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