To easily discharge the total amt. of a product and to achieve the reduction of a treatment space and the enhancement of treatment efficiency.

A binder or a coating agent is sprayed 10 into a container 1 performing exhaustion 8 at its upper part ant a powder is transported A upwardly in such a state that a transport bed is formed by the gas upwardly blown out of the central part 13 of the bottom wall 7 of the container and a moving bed is formed to the lower peripheral part in the container by the powders falling as shown by arrows B, C and the central part of the bottom wall is opened 6 after granulation and coating to allow a product to flow down under its own wt. to discharge the same out of the system.