Yankee surface restoration
The Yankee surface is critical for tissue making and even small marks on the surface can cause severe damages of the paper web. Actions to restore the surface is related to the degree of damage. Localized defects, grooves or scratches can mostly be removed with polishing. Damages like deep chatter marks, corrosion or wear demands a bit tougher treatment but is still no problem to cure. The original shape of the surface can be restored by On site Yankee profile grinding.
Valmet supplies following advanced solutions to restore perfect Yankee surface, ensure optimum performance and extend dryer life:
- Yankee surface polishing - removes build-up and chatter marks
- On-site Yankee profile grinding - restores the surface
- Thermal coating - perfect condition and prolonged life time.
The Yankee surface is critical for tissue making and even small marks on the surface can cause severe damages of the paper web. Valmet is a leading supplier of advanced solutions to restore perfect Yankee surface, ensure optimum performance and extend dryer life. We provide solutions for removing chatter marks and refurnishing the Yankee shell to more advanced actions like thermal spraying and on-site profile grinding.
Yankee surface polishing - removes build-up and chatter marks
Screen cloth refurbishment removes non-uniform organic coating and hard build-up on edges and establishes a uniform surface finish for the stability of the organic Yankee coating. It is easy to apply and it prevents crepe blade vibrations, sheet holes and edge breaks due to build up. The Yankee surface polishing (RSG) is recommended to restore surface, remove local defects, grooves, scratches and dents. The (RSG) polishing makes it possible to refurnish shell surface up to 0,2 mm.
On-site Yankee profile grinding - restores the surface
The CrownMaster grinding equipment can be quickly installed, either in the suction pressure roll position or doctor position, and provides high accuracy and grinding quality. It is cost and time efficient and has very short sheet to sheet time, requires few man hours and short downtime.
Thermal coating - perfect condition and prolonged life time
The application of Valmet Infinikote Yankee Metallizing provides an excellent Yankee surface, reduces the frequency of regrinding and greatly extends the life of the Yankee. Hard, protective coating is homogeneous, has good bond strength and is highly corrosion resistant. It is very reliable and unsurpassed in thermal coating life, heat transfer, blade life and Yankee surface efficiency.
Now available chrome free Valmet Infinikote-2 Yankee Metallizing.