Abstract: The invention concerns a drum for coating or drying grained substrates (10), said drum comprising a horizontal or slightly inclined axis (1). The invention is characterized in that the casing (2) of the drum comprises slots (5) for allowing through gas, said slots being formed between parallel ridges (8), said ridges (8) arranged inside the casing (2) of the drum sloping relative to the axis (1) and to the horizontal, such that the grained substrates (10), during rotation of the drum, are moved outwards of the drum into the discharge outlet zone. The geometrical cross-section of the ridges (8) is of any particular shape.

Abstract: The multicell apparatus according to the invention is suitable for batchwise and in particular quasi-continuous operation, i.e. for the continuous processing of batches in rapid succession, for example for the preparation of readily free-flowing granules which are suitable for filling in capsules or sachets. The apparatus is in particular a multifunctional system which combines the process steps of batch introduction, metering, mixing/granulation, drying, product cooling and product collection with one another in a very compact design. The individual batches are conveyed inside the apparatus through a product path which is hermetically sealed from the outside and in which an internal pressure lower than the ambient pressure may additionally prevail at least in sections. This, together with the cleaning nozzles connected to a central cleaning system, permits contamination-free operation both with aqueous and with organic starting materials.