Principles of the Through-Air Dewatering Theory for Selected Fibrous Materials (Press Section Felts)

摘要

The conditioning process of press felts is a very important operation to intensify the dewatering process of the paper web in the press section of a paper machine. A new method of conditioning press felts by means of airflow, which is more efficient in the dewatering and cleaning processes of felts, is presented. Calculation methods for the dewatering efficiency of press felts and the air demand of the airflow are based on Darcy's modified formula . A few methods for the determination of empirical coefficients have been suggested. The through-air dewatering of press section felts is especially advantageous for modern felts made entirely of synthetic fibres.