2005 Volume 52 Issue 3 Pages 122-127
Generally waste products contain many kinds of materials and crushing or comminuting for the recycling must liberate them. The process involves the use of impact and shear types of equipments. In the former type high rotating reversible blow bars pound the products toward the grading impact plates. But it is difficult to crush tender materials such as plastic films or clothes. In the latter type, the defacement of cutting blades increases more when hard materials such as metals or glasses are fed.
On the other hand, the media agitating type of equipments used for the liberation of mineral ore is considered unsuitable for the liberation of thermoplastic resins. However, they have some advantages such as easy going in operation and scale up. In this study, comminution of a media agitating mill (Tower Mill) was considered for the automobile shredder residues (ASR), which contain urethane, plastics, metals, glasses and so on. When ASR was directly comminuted, no significant variation could be observed in the weight percentage distribution. However in case of ASR frozen by liquid nitrogen and hot pressed by molding machine it was well comminuted. Especially it was found that the hot pressed light and heavy ASR could be easily comminuted to less than 1 mm at the ratio of 66.0% and 20.7%, respectively.
