Rotajet Mixed Rigids Washing System
Recycling plastics for mixed rigid plastics:
Rotajet Systems Limited manufacture fully integrated systems plastic washing and separation systems for mixed rigid plastics. When processing mixed rigid plastics, the polyolefin fraction polypropylene and polyethylene are generally the two fractions that recycling that are separated and these can be sold as a mixed PO (polylefin) or further separated into single streams. The mixed rigid requires shredding down to <50mm before processing in Rotajet plastic washing and plastic separation machinery. Depending on throughput requirements, there are a number of shredding options and also whether the in feed material is pre-sorted on a picking line prior to shredding. We would recommend that the discharge conveyor from the shredder is fitted with a overband magnet for initial ferrous separation and also a fine blower for removal of films, dust and dirt etc…prior to initial washing in the Rotajet plastic pre washing machine.
Rotajet Feed Hopper:
The Rotajet plastic pre washing machine requires the feed material is feed in at a uniform rate, to achieve this we recommend a Rotajet Feed hopper, the size of the feed hopper depends on throughput requirements. We recommend that the feed hopper is manufactured from 304 stainless steel, due to the moisture content in the feed material. The Rotajet feed hopper is fitted speed controlled screw auger conveyors, this ensure a consistent feed to the Rotajet plastic pre washer.
Rotajet Pre washer:
The Rotajet plastic pre washer is used for the remove any remaining dirt, dust, chemical residue, surface dirt. The Pre Washer is fitted with an incline high speed screw auger fitted with screens that allow the washing liquor to drain and then filtered prior to reuse. A spray bar is fitted along the full length of the Rotajet plastic prewaher, this spray bar is used to wash the plastic at high pressure and volume. The used wash liquor is filtered and is discharge into bulk storage tanks for ready for reuse.
Rotajet Float sink tank:
The washed material is fed into a Rotajet HKS Float sink tanks. The use of the Rotajet float sink tank is to remove any material with a density that is greater than >1, this results in the ABS, metals, glass, ceramics, pvc, filled plastics, rubbers, grit etc….sinking. The sinking fraction is removed from the Rotajet float sink tank using a series of bottom screw augers. The floating fractions are transferred along the surface of the tanks using rotating paddles, which drive the float material forwards towards the outlet screw of the tank, each paddle submerges the material under the surface of the liquid that frees any intermingled sinking fraction and allows it sink.
The floating fractions weirs over into the incline take off screw of the Rotajet float sink tank, this is fitted with a screen that allows the water to drain prior to pumping back to a storage tank for reuse.
The water in the storage tank is pumped back into the Rotajet float sink tank via. A series of spray bars, this ensures the floating fraction is cleaned with filtered water prior to discharge into the incline screw.
The floating fraction is fed from the Rotajet Float sink tank into a wet granulator for final size reduction and rinsing. The wet granulator is fitted with a spray bar that rinses the Polyolefin floating fraction as it is being granulated. The polyolefin (polypropylene and polyethylene) and water flows into an incline screw and transferred into the Rotajet MD horizontal friction dryer.
Rotajet MD Horizontal friction dryer:
The Rotajet MD series dryer is fitted with a high speed rotor, the rotor is fitted with d2 manufactured wear paddles. The plastic material is forced through the Rotajet friction dryer using both air and the striking force of the high speed paddles. The Rotajet MD friction dryer is fitted with a full length removable hexagon screen, the screen can be fitted with various size holes depending on the application, generally for plastic granulate a 1mm screen is fitted to allow the water to drain. After the dryer the material is blown into a Rotajet “Zig Zag” separator for final product clean up and bagging off.
Rotajet “Zig Zag” Separator:
The dried material is blown into the Rotajet “Zig Zag” separator; this is used to remove any wood, film, expanded PS and dust particles. The separator works by removing contamination via. Air flow. The Rotajet Zig Zag separator is fitted with Rotatory valve which allows the dried material to enter the Zig Zag column without allowing air flow. The “Zig Zag” column is fitted with light fraction removal fan drawing air up through the column, as the material descends through the Rotajet Zig zag separator, the light fractions are removed and heavier fractions drop to the bottom. At the bottom of the “zig zag” column is a removal fan that transfer the final finished product into a Rotajet double big bagging system.