Systems and methods for cleaning a batch of granular material

B - Operations – Transporting – 07 – C

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B07C 5/342 (2006.01) B07B 9/00 (2006.01)

Patent

CA 2542954

An apparatus and method cleans a batch of pellets or granules prior to use in an extrusion process. Loose contaminants having material characteristics that are undesired for the extruded product are first removed from the batch using a deduster. The deduster may also remove uncontaminated fines and fluff from the batch. Pellets that are defective or otherwise undesired for the extrusion process as well as other loose particle contaminants can then be efficiently detected and removed without the risks of fines clogging the apparatus or shielding the detection process. Magnets may help remove particulates of ferrous material before or after the removal of defective pellets. The resulting batch of pellets helps to produce extruded materials of higher quality, such as insulation material in electrical cables.

L'invention concerne un appareil (100) et un procédé pour purifier un lot de pastilles ou de granulés avant leur utilisation dans un processus d'extrusion. Les contaminants en vrac présentant des caractéristiques de matériaux qui sont indésirables pour les produits extrudés sont retirés en premier (110) du lot au moyen d'un dépoussiéreur. Ce dernier peut également retirer du lot les fines et les peluches non contaminées. Les pastilles qui sont défectueuses ou indésirables pour le processus d'extrusion ainsi que d'autres contaminants particulaires en vrac peuvent ensuite être détectés et éliminés de manière efficace (120) sans que les fines ne risquent d'obstruer l'appareil ou d'affecter le processus de détection. Des aimants peuvent faciliter l'élimination (130) de particules de matériaux ferreux avant ou après l'élimination (120) des pastilles défectueuses. Le lot de pastilles obtenu facilite la production de matériaux extrudés de qualité supérieure, par exemple de matériaux d'isolation destinés à des câbles électriques.

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