Wrinkles from wet streaks
1. Reduce refining if slow stock is causing draw line at couch to sag at edges and produce wrinkle going into first press.
2. Reset slice profile so couch draw line does not sag at one or more points and wrinkle going into first press.
3. Check that deckle boards are not causing severe wave patterns on forming fabric.
4. Reposition end deckle.
— if not possible, shut off flat-box and take action to repair.
5. Reduce flow of sealing water on flat-boxes.
6. Unplug, reposition or change defective or improperly set trim squirt.
7. Pull in on machine trim if too wide.
8. Couch suction box and/or suction press end deckles may need to be repositioned.
9. Reposition suction box for optimum operation.
10. Correct draw setting.
11. Check press loading to be sure both sides are loaded uniformly.
12. Wash filled felt and straighten truing line.
13. If felt conditioning box is plugged, open box and put back into service.
— if inoperative, take action to repair.
14. Check operation of felt conditioning shower.
15. Keep felt truing line straight and tighten felt to prevent wrinkling or roping up.
16. For low vacuum in press nip suction box, determine reason and correct.
17. Incorrect conditions on grooved press set-up.
— check water removal from press roll grooves.
— check groove geometry, depth and width.
— check purging shower angle and water pressure.
— check for blocked nozzles and general cleanliness.
18. Check for heavy wrinkle in dryer felt (particularly in dryer section after size press) and takecorrective action.
19. Clean or scrape dirty dryers to prevent build up of pieces of broke causing insufficient localized drying.
20. If dryer felt is too narrow, change it.
— if running too far to back or front of machine, center the felt.
21. Check action of the dryer felt stretcher and increase felt tension.
22. Reduce moisture content of sheet entering size press to prevent bagging with weight of starch pond.
— check for excessive starch flow.
23. Adjust draws and check setting of spreader devices before and after size press
Review topic, Basis weight (CD) variations.