Patent ID: 7077906

Claim:
An apparatus for continuously introducing a substance in liquid phase into plastics granules, comprising: a supporting structure; wherein the supporting structure is adapted to support in series and in substantial vertical alignment: a feeding section of the plastics granules provided with means for feeding in a substantially continuous manner the plastics granules to at least one spraying chamber provided with means for spraying the substance in liquid phase onto the plastics granules; at least one mixing chamber of the plastics granules partially or totally coated with the substance in liquid phase comprising substantially static mixing means supported in the at least one mixing chamber; and at least one drying chamber adapted to receive a predetermined amount of the plastics granules coated with the substance in liquid phase; wherein the means for spraying comprises a plurality of injectors annularly offset from one another, wherein the at least one spraying chamber comprises a shaped insert adapted to define in the at least one spraying chamber respective flowpaths of the plastics granules facing each of the injectors and defined in respective channels axially formed in the shaped insert, and wherein the injectors are oriented so as to spray the substance in liquid phase into the channels in countercurrent to a continuous flow of the plastics granules.