The document summarizes the advantages of Eriez Manufacturing Co.'s P-Rex drum technology over traditional electro drum technology for ferrous scrap separation. The P-Rex drum provides greater and more uniform magnetic strength across the drum surface, eliminating weak zones around the edges and at the transfer point that cause traditional electro drums to miss valuable ferrous scrap. It also does not experience declines in magnetic strength from heat rise during operation like electro drums do. As a result, the P-Rex drum provides improved ferrous scrap separation and recovery.

4. Worldwide Affiliate Locations

5. Innovation in Scrap Drum Technology

6. Today’s Scrap Drum Technology  Weak zones at the drum edges  Drop zone at the “transfer point”  Declining performance after start up (as they get hot, they lose strength)  The prime evidence, missed “meatballs” Three major performance shortcomings:

8. Weak Zones at the Edges Electromagnet cross-section Steel Core Width of the Drum Face Width of Field

9. Dead Zones at the Edges The result is less ferrous separation at the edges, missed metals and poor recovery. This area accounts for roughly 15 to 20% of the surface area of the drum. The wider the Drum, worse the problem. An Electro-Magnetic Scrap Drum

10. Dead Zones at edges for other drums Electro-magnet Transfer Zone This is another manufacturer’s radial design electro drum. The remaining paint indicates where the drum has less edge strength.

12. 72-Inch Dia. Electro Drum Working width of drum Working width of the tray

13. Weak at the edges Electro coil, a necessary component Steel core, it does the attraction work Electro coil “crowds out” valuable core width The only solution is to oversize the drum in width This solution is not cost efficient Space for the coil, an inherent weakness

15. Drop Zone at the Transfer Point The transfer point has reduced magnet force and therefore “drops”. Coil crowds out valuable internal space This means lost recovery. Electro-magnet Cross-section Carrying Magnet Pick-up Magnet

16. Drop Zone at the Transfer Point  The area between these coils (about here) can drop metal creating additional burden and lost recovery Electro-magnet Transfer Zone

19. Loss of Performance due to heat rise:  60 to 70 percent of their initial strength  Operating gap is effectively reduced from 10 to just 6-inches or less for best recovery.  Losing recovery before noon, least effective during over-time, more hand sorting and higher waste

21. There is a Better Way! Introducing …

23. Greater Strength at any distance 60” P-Rex Drum Compared to 72” Drum 3.5” to 6.5” 1100

24. Field Projection, Electro vs. P-Rex Electro P-Rex Drum Surface

25. “ Edge-effect” The teal color is the working area. The Electro has field reversal at the edge

26. No Transfer Drop Permanent Strength Electro Strength

27. Temperature Rise Effect

28. Hot Hot Cold Cold P-Rex All Day Electro Startup Condition Electro Operating Condition

29. Electro 60” x 96” Hot & Cold Conditions

30. Advantages of Eriez P-Rex Drum Stronger, (at any distance!) Wider (less edge loss) Uniform strength over time (no electrical heat rise) Results: Better Recovery

31. The P-Rex & the “Green Bonus” (environmentally and financially “green”) Lower purchase cost (no transformer/rectifier to purchase) Lower operating cost (no transformer/rectifier to continually power and maintain plus no periodic rewinding of electrical coils ) Lower installation cost (no transformer/rectifier to install, wire and isolate)

32. P-Rex 60” x 96” Drum

33. Comparing 72” Electro to Eriez 60” P-Rex ERIEZ P-REX 72” ELECTRO