Theoretical analysis of the dewatering and consolidation process of the wet paper web with the air through- blowing technique is presented in this study. This kind of process takes place in a new (patented) device called the air press. The results of theoretical considerations are experimentally verified. The experimental research was conducted on a specially designed experimental stand with the use of three kinds of paper used for oil and air filtration. It was proven that the air through-blowing process of the fibrous web dewatering can be considered as unidirectional consolidation with the linear relationship of dehydration and deformation. A new system of devices was suggested for the continuous production of high quality filter papers, with the air press as its basic element.

The work presents characteristics of the pressure pulsation of the paper stock flowing through its approach system to the paper machine headbox and through the headbox. Theoretical model of the pulsating flow of the stock in the pipelines is described and conditions are suggested for the pipeline system to avoid creation of the wavy resonance. The relationships have been developed determining the effect of the pressure pulsation of the stock on its distribution on a surface of paper web being formed on the paper machine wire. Analysis of these relationships enables proper selection of the damping means of the pressure pulsation of the stock being delivered on the paper machine wire.

The study presented here offers an analysis of the heat flow through the wall of the Yankee cylinder when regarded as a thin-walled vessel. The effect of the selected design and process parameters (i.e. cylinder diameter and steam pressure) on density of the heating stream has been analyzed and discussed for both cast iron and steel cylinders. Based on the work presented here, the optimal ranges for steam pressure have been derived and proposed for cylinders mounted at various locations within the drying section.