Apparatus for coating or encapsulating articles

An apparatus for coating or encapsulating articles, comprising a drum with a perforated wall rotatably mounted in a wrap-around chamber, the drum being suitable for containing and removing a batch of articles to be coated during the rotation of the drum;

• a dispenser group with at least one nozzle for spraying a coating product on the articles contained in the drum;
• at least one gas inlet to the chamber on a first side of the drum to direct clean drying gas against the perforated wall of the drum and at least one gas outlet from the chamber to the other side of the drum, adjacent to the perforated wall of the drum to extract from the chamber dirty drying gas that has passed through the drum, the apparatus comprises an adjustable closure system interposed between the drum and the gas outlet of the chamber, capable of defining an effective passage for the dirty drying gas smaller than the passage offered by the gas outlet of the chamber and further displaced or concentrated coinciding with the area (4a)-of the perforated wall of the drum that is effectively covered by the batch of articles.