Method and apparatus for introducing in continuous a...

B - Operations – Transporting – 29 – B

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B29B 7/94 (2006.01) B01F 5/20 (2006.01) B29B 9/16 (2006.01) B01F 3/12 (2006.01) B01F 13/10 (2006.01)

Patent

CA 2356864

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, (b) spraying said substance in liquid phase onto the plastics granules continuously flowing within said spraying chamber, (c) submitting to mixing the granules partially or totally coated by said substance in liquid phase, continuously leaving the spraying chamber, by means of substantially static mixing means supported within a mixing zone provided downstream of said spraying chamber and comprising at least one mixing chamber, (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.

La présente invention concerne un procédé et un appareil d'introduction en continu d'une substance en phase liquide dans des granules de plastique. Ce procédé consiste à: a) charger d'abord un écoulement sensiblement continu de ces granules de plastique dans au moins une chambre de pulvérisation sensiblement statique (40, 29), b) pulvériser ensuite cette substance en phase liquide dans les granules de plastiques en continu s'écoulant dans la chambre de pulvérisation (40, 29), c) mélanger ces granules recouvertes totalement ou en partie par cette substance en phase liquide quittant en continue la chambre de pulvérisation (40, 29), au moyen d'un dispositif de mélange sensiblement statique (6) placé dans une zone de mélange (5) située en aval de la chambre de pulvérisation (40, 29) et comprenant au moins une chambre de mélange (5a, 5b), d) sécher les granules ainsi obtenues pendant un temps suffisant pour permettre aux granules d'absorber presque totalement la substance en phase liquide. Pour plus d'efficacité, cette invention permet d'imprégner en continu des granules en plastique, de réduire au mieux l'effet abrasif des granules elles-mêmes et réduire ainsi au minimum la production de poussière de plastique.

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