METHOD AND APPARATUS FOR MODIFYING PARTICLES

摘要

Particles are cooled at a particle introducing section by a cooling device. A vapor of modifying agent for modifying the particles is produced by heating the modifying agent in a vapor producing chamber by a heating device. Further, a supersaturated vapor of the modifying agent is produced around the particles by mixing the cooled particles with the vapor of the modifying agent. The modifying agent condenses on the surface of the particles by the production of the supersaturated vapor, and consequently, a film of the modifying agent is formed on the surface of the particles. A thick film of the modifying agent can be formed if this film forming step is carried out repetitively. Thus, modified particles having formed thereon a thick uniform film of the modifying agent can be produced by quite a simple manipulation in a very short time.