Check for beating in papermaking process

4. Hydration degree

A method of expressing the total amount of bound water absorbed by a fiber during the beating process.

The determination method is to heat and boil the slurry for 1 hour, use the heating method to remove the binding water of the fiber, and then determine the beating degree according to the ordinary method; The degree of hydration of the fiber of the slurry is expressed by the difference of beating degree measured by unheated slurry and heated boiled slurry respectively.

At the beginning of beating, the hydration degree decreased with the increase of beating degree value. The hydration degree could not explain the phenomenon that the fiber continued to swell in the late beater, indicating that the hydration degree could not completely represent the swelling value of the fiber.