Wire marks

From ridges:
1. Tray water continually running on one spot inside forming fabric.
— remove fiber build-up and take corrective action to eliminate cause of tray water spillage.
2. Stock on breast roll, pressure roll or return rolls caused by water running around rolls and allowing stock to build up.
— find cause and rectify.
3. Check for proper alignment of breast roll, couch roll or return rolls (indicated by forming fabric seam and wire travel).
4. Remove burrs on any roll including a table roll.
5. Test couch drillings with scraper before putting on a new forming fabric.
6. Replace worn drainage elements or return rolls.
7. Adjust tension on forming fabric with stretcher roll.
— eliminate any variations in tension.
— consider use of spreader roll in wire return loop.
8. Repair or replace grooved or worn suction boxes.
9. Reduce vacuums to prevent freezing or hanging of forming fabric on a suction box.
10. Inside ridges tend to be caused by:
— stock on the breast roll, return rolls, or couch rolls, or any roll inside the forming fabric.
— a worn table.
— improper tension or having the forming fabric too tight.
— improperly aligned breast and couch rolls.
11. Outside ridges tend to be caused by:
— any roll on the outside of the forming fabric, an open doctor, or an improperly fitted doctor.
— pitch sticking to a roll rotating often enough.
— depressions in the surface of the breast roll (blow holes, plugs, dents, etc.).
See Wire ridges/creases.

From seams:
1. Forming fabric may be too closed, not allowing proper drainage at seam.
— a change of grade will temporarily overcome the problem.
— a new forming fabric may be necessary.
2. Clean dirty seams with a high pressure hose, or steam hose and solvent.
3. Marks from dirty seams.
— the coarser the forming fabric, the more wire marks will be in evidence.
— if wire marks occur while making board, the skimmers or deflectors are probably set too high.
4. Reduce vacuums to prevent freezing or hanging of forming fabric on a suction box.

From wire patches:
1. Mesh not lined up properly for good drainage so remove patch and remake.
2. Patch poorly made so edges are not adhering to wire properly.
— remove patch and remake it or tack it down properly.
3. If patch edges are filling up, clean with a wire brush (lightly) or remake patch if necessary.
4. Remake the patch if puncture or cracks are sewn too close together or too far apart.