Sheet following top press rolls

1. Sticking is dependent on press roll material.
— the smoother the material, the worse the sticking.
— some relief may be obtained by grinding the roll coarser.
2. Establish control of water quality.
— soft water gives less sticking.
3. Accurately maintain pH and sulfate ion content of system.
— the openness of the system must be controlled so that pH is not maintained by undue accumulation of sulfate ions with little accumulation of aluminum ions.
— monitor white water conductivity.
4. The use of various chemicals, e.g., polyphosphates, either in the white water or in doctor pond, can reduce sticking.
— if sticking is due to poor pitch control, then napthalene-sulfonic acid derivatives or other pitch dispersing agents can be used.
5. Kerosene was often used in the past, but it is no longer recommended.
6. The position of the draw roll is important in the operation of the press.
7. Check for proper press loading and adjust as needed.