How Surface Design of Suction and Press Rolls Affects Dewatering, Paper360º March/April 2021

The first Fourdrinier paper machine was invented by Frenchman Nicholas-Louis Robert in 1799. Ever since, paper manufacturers have wanted to improve the dewatering process. Numerous theories and models have been developed for press nip dewatering. A new concept exploits the surface design of suction and press rolls and comprehensively analyzes optimum dewater-ing characteristics. 

DEWATERING IN THE PRESS SECTION
The main function of the press section is to dewater the fiber mat by using mechanical pressure. The dry content is increased in the presses before the paper web is transferred to the dryer section. The higher the increase in dry content out of the press section, the less drying energy is needed. This makes the paper manufacturing process more efficient and cost effective. This is reason enough to make the dewatering of the paper web as efficient and effective as possible. 

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