| 摘要 |
<p>A device for the separation of materials having different melting points, for example waste material consisting of plastics coated with aluminium foil, comprises a separating head 11 into which is fed, from an extruder 1 connected to the separating head 11, plastics material 6 which has been plasticised in the extruder 1 and which carries particles of aluminium foil. The separating head 11 encloses an edge filter 21 comprising a stack of washers or a helically wound strip. A rotating conveyor screw 19 forces the plasticised plastics component of the material 6 through the edge filter to apertures 17 and conveys the foil particles to a discharge aperture 18. Each of the washers forming the edge filter has (Figs. 2, 3 not shown) an annular collecting groove 25 adjacent its inner periphery, the groove 25 communicating with a radial recess 26 in the outer periphery. The recesses 26 of all the washers are aligned to form an axial duct which communicates with the discharge apertures 17. <IMAGE></p> |
