Method and apparatus for introducing in continuous a substance in liquid phase into plastics granules

Method for continuously introducing a substance in liquid phase into plastics granules comprising the steps of:

• a) feeding a substantially continuous flow of said plastics granules to at least one substantially static spraying chamber,
• b) spraying said substance in liquid phase onto the plastics granules continuously flowing within said spraying chamber, wherein said spraying step is carried out by a plurality of injectors supported within said spraying chamber by intermittently injecting the substance in liquid phase at an injection frequency comprised between 500 and 2000 strikes/mim and at an injection pressure comprised between 100 and 300 bar,
• c) passing the granules partially or totally coated by said substance in liquid phase continuously leaving the spraying chamber through substantially static mixing means supported in at least one mixing chamber provided downstream of said spraying chamber, so as to submit said granules to mixing,
• d) submitting the mixed granules so obtained to drying for a time sufficient to allow a substantially complete absorption of the substance in liquid phase by the granules.