Blistering

Blistering is usually an edge problem on tissue machines with most corrective action being edge related.

1. Caused by dirty Yankee cylinder surface.
— clean or polish Yankee cylinder.

2. Reduce Yankee dryer temperature.

3. If sheet moisture content is too high, check stock freeness and pressure roll loading.

4. Check Yankee hood temperature to be sure supply and exhaust fans are running.

5. Check felts.
— wash or change as required.
— check all felt conditioning devices and shower nozzles.

6. For problems with adhesion to Yankee surface, check sheet moisture, stock freeness, white water pH, and dosage of adhesive agent.

7. Check pressure roll for loose rubber cover.
— replace as needed.

See Blistering or cockling.