| 摘要 |
An apparatus is provided for treating particulate material with a coating medium, in particular for sugarcoating or film-coating pharmaceutical or food preformed pieces. The apparatus comprises a container drivable to rotate about a rotation axis, a spraying device for spraying the material with the coating medium and supplying means for supplying process air. The container comprises a bottom and an upstanding wall where the rotation axis of the container is substantially vertical and where an inclined return surface is arranged in the container. The return surface extends from an upper region of the container in the direction of an inner diameter region of the bottom. In a method for treating particulate material to be carried out with the apparatus, the material is moved in the container in a continuous circulating motion along the bottom from an inner diameter to an outer diameter region of the container, from there along the upstanding wall from a lower to an upper region of the container and from there along the inclined return surface back to the inner diameter region of the bottom. The material is moved along the bottom and/or along the wall in a centrifugally, tangentially rolling movement with respect to the vertical axis of the container.
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