To understand the cutting action of nonwovens, imagine the grit particle held by a helical spring rather than a solid block. The force applied to the nonwoven product is not transferred directly to the workpiece. Some of the force is absorbed in the compressing spring. Nonwovens are less aggressive than coated products and tend to give a finer finish.
As a nonwoven product runs over a contoured surface the “springs” compress and expand allowing the grain to constantly be in contact with the entire surface. A coated product would skip over the valleys and remove excess metal on the peaks as the force of application would be concentrated on the smaller area of the peaks. The nonwoven uniformly finishes contoured surfaces without compromising critical tolerances obtained in earlier machine or molding operations.
This feature is especially important during a finishing process. The conventional method for removing deep scratches is to use a progression of coated abrasives, e.g. 80, 120 and 180 grit, each giving a progressively finer finish while removing the previous deeper scratch. The conforming nature of non-wovens allows deeper scratches to be removed while providing a fine finish. This reduces the number of steps in the process – A major cost saving given today’s labor costs.
There are multiple forms of Non-Woven Abrasives:
- Cleaning and Finishing
- Surface Conditioning Material (SCM)
- Convolute and Unitized Wheels
The grit rating of non-woven abrasives does not utilize a number coded like coated abrasives, instead offering a rating of course, medium, fine and very fine. Depending on the pressure applied you can have differing results of scratch depth and finish.
Let Abrasive Products help you determine which non woven abrasive would work best for your finishing application. Contact us today.