METHOD AND APPARATUS FOR INTRODUCING IN CONTINUOUS A SUBSTANCE IN LIQUID PHASE INTO PLASTICS GRANULES

摘要

The invention relates to a method and an apparatus for introducing in continuous a substance in liquid phase into plastics granules by means of the steps of: a) feeding a substantially continuous flow of said plastics granules to at least one substantially static spraying chamber (40, 29), b) spraying said substance in liquid phase onto the plastics granules continuously flowing within said spraying chamber (40, 29), c) submitting to mixing the granules partially or totally coated by said substance in liquid phase, continuously leaving the spraying chamber (40, 29), by means of substantially static mixing means (6) supported within a mixing zone (5) provided downstream of said spraying chamber (40, 29) and comprising at least one mixing chamber (5a, 5b), d) submitting the granules so obtained to drying for a time sufficient to allow a substantially complete absorption of the substance in liquid phase by the granules. Advantageously, the invention allows to continuously impregnate plastics granules, reducing to the best extent the abrasive action on the granules themselves and hence to minimize the generation of plastics dust.