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Possible reasons for creasing:
- Belt is too flexible (specify stiffer backing).
- Grit is too fine.
- Contact roll is tapered (cone shaped). Redress roll.
- Contact roll and idler roll are not parallel.
- Contact roll or idler roll are worn in the center portion.
- Belt tension is too low. It is also possible for the tension to be too high, although not as common.
- Dirt on the contact roll or idler roll.
- Tracking mechanism is damaged or defective.
- Worn bearing on the contact roll or iddler roll.
- Uneven belt stretch due to improper work feeding.
- Belt is not installed on machine straight.
- Moisture imbalance across the belt. Check humidity.
- Belt is improperly joined.
- There is a drop in air line pressure affecting tracking or tensioning mechanisms.