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 3MTM Mill Roll CoversUnique Construction 3MTM Mill Rolls are made of non-woven synthetic fiber discs bonded together with a tough flexible adhesive. The resulting assembly is a resilient roll that is gouge resistant and self-healing. On continuous coil lines and sheet processing lines, you can expect longer life and better performance than rubber, felt and urethane rolls. For example, 3M Mill Rolls have lasted up to 100 times longer than rubber rolls in certain operating positions. Unlike dense rubber, 3M Mill Rolls are also porous with up to 40% void volume for absorption that helps in wringing and tensioning. Porosity also helps in applying uniform lubricant or coating thickness.  In wringer, oiler, tension/Bridle or support applications 3M Mill Rolls can help improve productivity and cost efficiency of line operations with fewer defects from "carry out" or slippage.Performance Advantages
 Inspection Station Roll-Out Roll Coefficient of Friction With a higher coefficient of friction than rubber, urethane or carbide coated rolls, 3M Mill Rolls can increase tension levels for tighter coils. Compared to most rubber compounds, tension can be increased as much as 40 times! Tighter coils provide these benefits:
 When used as Tension and/or Bridle Rolls, 3M Mill Rolls provide a coefficient of friction 50% or higher than rubber or urethane on dry steel and more than 40 times higher on oiled steel. It is never necessary to "texture" the roll surface to improve gripping power.
High Performance Rubber rolls are essentially non-compressible, so rubber covers tend to bulge at the nip. This outward pressure causes tensile stresses that can enlarge cuts and gouges caused by metal slivers, strip splices, production debris or compression. Metal slivers cause strip defects by scratching and splices or production debris easily gouge rubber rolls. The result of these defects is increased "carry out" in wringing applications, eventually contaminating bath solutions. 3M Mill Rolls with their void volume and non-woven porosity are slightly compressible. Under pressure, the roll increases in density at the nip. As the density increases, the material compresses inwardly, causing the roll cover to resist cuts and gouges. This compressive stress allows cuts to heal themselves as the compressive forces push the sides of the roll cover closed - resulting in low defects and high productivity. Repairable Roll Cover While 3M Mill Roll Covers resist cuts and gouges and are self-healing, they can be damaged by major strip irregularities. Repairs can easily be accomplished on-site by removing the damaged part of the cover, installing part of new cover equal in length to the damaged area, re-compacting the entire cover and re-dressing it to size.  Repaired Cover After Re-Dressing
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