disclosed are methods and devices for producing very fine particles which are then coated with protective polymers in another step of the process . the particles are produced using a method in which a liquid flow comprising a particle - free liquid 1 that contains the active substance in a dissolved form is combined with a second liquid flow comprising a liquid 2 in a high - energy zone or no sooner than two seconds before reaching the high - energy zone . said two liquids can be mixed with each other while the active substance dissolved in liquid 1 is insoluble or more difficult to dissolve in liquid 2 than in liquid 1 and settles in the form of particles in the high - energy zone or within a maximum of 2 seconds before reaching the high - energy zone when the two liquids are mixed . the obtained particles are introduced into an aqueous outer phase which contains the coating materials in a dissolved form and are then subjected to a drying step such that said materials settle on the particles as a closed coating . the coated particles are protected from damaging influences and are provided with modified release kinetics compared to uncoated particles .