Method and apparatus for separating polymeric materials

B - Operations – Transporting – 29 – B

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B29B 17/02 (2006.01) B03B 5/28 (2006.01) B03B 5/44 (2006.01) B03B 9/06 (2006.01)

Patent

CA 2275944

A method for recycling polymeric materials, including a plurality of mechanical separation steps (B), a first density separation step (C), an intensive cleaning step (E), a second density separation step (G, V), a third density separation step (M, W) and optionally a fourth density separation step (Ga, Gb). Further less essential steps such as wetting (A), grinding (D), air flow separation (K), drying (I), electrostatic sorting (Z) and optical sorting (Za) steps may also be carried out to achieve optimised and refined separation. Polymeric materials from refuse or crushed motor vehicles may thus be separated, and polyethylene, polypropylene, polystyrene and acrylonitrile-butadiene-styrene resins may be recycled.

Un procédé pour recycler des matériaux polymères comprend plusieurs étapes de séparation mécanique (B), de première séparation par densité (C), de nettoyage intensif des matériaux polymères (E), de deuxième séparation par densité (G, V), de troisième séparation par densité (M, W) et le cas échéant de quatrième séparation par densité (G a, G b). On utilise d'autres étapes moins indispensables de mouillage (A), de broyage (D), de séparation à flux d'air (K), de séchage (I), de tri électrostatique (Z), et de trioptique (Z a) pour optimiser et affiner la séparation. Des matériaux polymères provenant de déchets ou du broyage de véhicules automobiles sont séparés, du polyéthylène, du polypropylène, du polystyrène et des ABS sont recyclés.

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