Method and system for comminuting and cleaning waste plastic

Details Method and system for comminuting and cleaning waste plastic Method and system for comminuting and cleaning waste plastic

B - Operations, Transporting

29

B

B29B 17/00 (2006.01) B29B 17/02 (2006.01)

Patent

CA 2602528

The invention relates to a method for comminuting and cleaning waste plastic, particularly mixed plastic (MKS) with the following steps: a compacted material, particularly an agglomerate, is produced from film scraps or from film remnants, which are comminuted into flakes, and/or from thick-walled plastic parts, which are chopped up into chips. The compacted material is introduced into a disc or drum refiner and is ground therein in the presence of water. The portion of compacted material of the stock located inside the refiner is at least 10 percent by weight. A fine-grain fraction is removed from the ground stock exiting the refiner. The remaining ground stock is washed and either mechanically dewatered and dried or is ground once more in another refiner stage in the presence of water after which it is dewatered and dried.

La présente invention concerne un procédé pour fragmenter et purifier des déchets de matière plastique, en particulier un mélange de matières plastiques (MKS), le procédé comprenant les étapes suivantes: un compactat, en particulier un agglomérat est produit à partir de rognures de feuilles ou de résidus de feuilles fragmentées en éclats et/ou de pièces de plastiques épaisses réduites en copeaux ; le compactat est introduit dans un dispositif d'affinage en forme de disque ou de tambour, et broyé dans celui-ci en la présence d'eau, la proportion en compactat de la matière qui se trouve dans le dispositif d'affinage, valant au moins 10 % en poids; une fraction à grain fin est extraite de la matière broyée qui sort du dispositif d'affinage; la matière broyée restante est lavée, puis soit déshydratée et séchée mécaniquement, soit à nouveau broyée dans un autre étage d'affinage en la présence d'eau, puis déshydratée et séchée.

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