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New rigid PP sorting line adds conveyor

2000 middleton conveyor at biffa

Recycling machinery specialist Middleton Engineering has manufactured and installed a second bespoke conveyor to enhance processing requirements at Biffa Polymers’ food-grade high-density polyethylene recycling plant at Redcar, Cleveland.

The 9.3m conveyor forms part of a separate new recycling line for mixed post-consumer rigid polypropylene. This produces high-quality mixed plastic flakes for onwards distribution, and forms part of Biffa’s expansion of its production capacity.

The conveyor transfers material from a shredder, up to the in-feed conveyor for a granulator. It incorporates a 600mm wide, cross-stabilised, three-ply rubber belt, with a rising section angled at 25 degrees to carry material currently at a rate of 1.5 tonnes per hour.

Sprung castor wheels maintain belt tracking, while 50mm-high cleats across the belt, together with valances to either side at 275mm high, prevent material from slipping back to ensure a consistent feed rate.

A special feature to further improve waste stream purity and quality includes a magnetic head drum for separating ferrous metals at the head of the belt or discharge end of the conveyor. This provides secondary metal protection with continuous separation, trapping debris as the drum rotates, while clean product is discharged.

Lock-off emergency stop switches, safety pull gantries on the rising section and supervisory control and data acquisition controls to integrate the conveyor with other machine processes complete the installation.

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