Page 4 - Hub-4 Magazine ISsue 64

Feature Story
The undersize (sub 180mm) is conveyed to a Spaleck combi screen, this was the first screen installed in Scotland to include the innovative smartSUSPENSION system; the screen rests on air bags rather than steel springs which means that the system is highly robust, cost-effective and very reliable, even in the harshest of working conditions. It shows no fatigue or settling behaviour as known from the screw pressure springs or rubber buffers used in past systems.
The Screen creates 3 fraction sizes in one pass, the fines are removed from the bottom flip flow section at sub 10mm, these are treated by an inline magnet to remove the ferrous material. The top deck has 75mm 3D screen plates, this material enters a picking station which uses the same bays as the oversize material to remove wood, plastic and waste with the residual getting treated by an overband magnet and air knife to create a clean aggregate.
The 10 -75mm fraction is treated autonomously via the Bluemac Mids Clean-up system. This incorporates non-ferrous removal using a custom Eddy Current, ferrous removal via an inline magnet and finally lights and heavy’s separation using the Westeria Airstar windsifter. With the acceleration belt on the Airstar offering speeds of up to 3m/s, it guarantees the highest throughput with the optimal separation result. “
The output of this new plant is now at 50tph, a great improvement on their previous system which was turning out around 20tph. The output materials include, 20% wood, 29% hardcore, 28% 10mm-50mm fines, 5% ferrous metal, 2% non- ferrous metal, 4% rigid plastic, 2% cardboard and 10% residual waste.
One of the key benefits of Patersons’ newly installed plant is the costs they will save on fines, by having a lower LOI (Loss on Ignition) value. This new plant allows them to classify their materials more accurately to quality for lower levels of landfill tax. The new system includes increased automation, meaning they can process more tonnage with fewer manual pickers, which will be a massive cost saving in the long run.
Managing Director of Patersons, Kerr Paterson, offers his thoughts on the new plant: ‘’I am delighted with what Blue Scotland and BlueMAC have produced. BlueMAC have designed a truly remarkable construction/skip waste recycling plant, bringing together components from some of the best brands in the world. I visited a few other manufacturers to view their latest projects, but as soon as Blue presented their idea to me, I was sold on it. On top of this plant, we have bought and run several machines from Blue in the past and their level of back up and support is non comparable. The local service provided by Blue Machinery Scotland and the expertise in the design process from BlueMAC was winning combination for us.’’
| p4 |
www.hub-4.com Sept/October 2020 - Issue 64