Ridges

1. Generally result from ridged wire.

2. Check and repair grooved or damaged slice lip.

3. Check and repair grooved or damaged press rolls.
— check the doctor blade or adjust press loading to minimize ridge.

4. Watermarking ring pressure too high.
— reduce loading.

5. Repair or replace grooved or damaged size press roll.
— change winder setup to trim ridge into a butt roll.
— if possible use a felt pad on damaged roll to smooth out ridge.

6. Localized hot spots on calender rolls cause caliper variation and ridges.
— check calender stack for a defective doctor blades.
— use calender cooling to minimize localized heating.

7. Replace grooved or damaged calender roll.
— check doctor blades and loading.

8. Locate source of trouble and if due to grooved or damaged spreader bar, spring roll or mount hope roll take corrective action.

9. Repair or replace grooved or damaged winder riding roll.
— lift riding roll or reduce riding roll pressure at as small a set diameter as possible.

10. On center wind or level wind reels, reduce reel bar pressure on damaged or grooved reel drum.

See Wire ridges/creases.

Note: Where possible oscillate winder backstand to eliminate small ridges.