Dust in rolls

1. Excessive dust can generally be traced back to dull slitters.
— it is essential to keep slitters sharp and to maintain system.
— occurs more often when rolls are cut with score-cut slitters.
— easily corrected with sharp slitters and proper sharpening angle for the grade of paper being slit.
— if problem is serious, consider shear-type slitting using wraparound slitters.
— if draw-shear slitters are used, the web should be supported on both sides of the slit.
2. Check spreader devices for correct set-up.
3. Ensure that the sheet is not over-dried.
4. Check or adjust slitters to ensure they are driven slightly faster (10%) than web.
5. Check and regrind slitters to keep as sharp as possible.
6. Ensure proper slitter set-up; depth, angle of relief, proper side loading, etc.
7. Check web tension so that sheet is not loose on one side entering slitters.
— check and adjust guide rolls or unwind stand.
8. Dust can be eliminated by using a vacuum unit at the slit or by brushing the roll ends before wrapping.
— these actions are usually correcting for a faulty set-up.
9. An alternate remedy is to use a mineral oil wick at the top slitter that transfers a small amount of oil to the web edge.
— this holds the dust and prevents it from getting onto the sheet surface.