7 concentrated aqueous hydrophobin a solution feed 7 is sprayed onto the dry material from part 6 remaining in the fluidized bed 1 2 kg particle size of the initial charge lt 1 25 mm at a spraying rate of 3 7 kg h the average gas inlet temperature is 141 degrees and the associated stream of drying gas air is 99 m 3 h the average product outlet temperature in the lower region of the spray fluidized bed is 72 degrees the granules are continuously discharged via a discharge screw the particle size is controlled via the screening of the discharge and appropriate grinding of the coarse material in a grain cutter from 22 7 kg of feed 7 1 7 kg of dry material result sample 7 fig5 the bulk density of the useful fraction is 0 65 kg l the fraction between 0 2 0 72 mm particle size is 98 9 besides using the grain cutter in this example a roller mill or a grinder or the like is suitable for grinding the coarse material the contact angles of the redissolved hydrophobin containing dry material resulting from the activity test are listed in tab 7 the protein gel of the redissolved dry material is shown in fig5 894 kg of aqueous hydrophobin b solution ds 2 4 by weight hydrophobin concentration 6 3 g l are concentrated 226 kg of concentrated aqueous hydrophobin b solution result ds 9 7 by weight hydrophobin concentration 35 4 g l part 1 1 kg of the hydrophobin b containing dry material from a spray drying analogous to example 5 is initially introduced the gas inlet temperature is 141 degrees and the associated stream of drying gas air is 49 m 3 h the.