particle coating processes and systems employ uv curable materials to form tack - free surfaces rapidly . by applying uv curable compositions on well suspended particles a uv particle coating technology enables a scalable process of coating fine particles at desirable coating thicknesses with a wide spectrum of obtainable properties . processes in accordance with the present invention decouple the particle suspension and film formation steps , enabling ample time to first deliver evenly the coating materials to the particle surfaces , followed by rapid polymerization / curing reaction induced by the uv light to rapidly create tack - free surfaces , thus preventing particles agglomeration while achieving uniform and thin - layer coating .