Kinetics of Vapour Diffusion and Condensation in Natural Porous Cellulosic Fibre Web

Abstract EN

Vapour diffusion in a porous web material followed by its absorption or condensation is a typical process for all porous materials particularly on polymeric and natural basis.

The description of kinetic weight increment increase during this process was proposed by use of a relatively simple function with adequately defined theoretical background.

It was shown that this kinetic process is controlled by vapour diffusion through porous web material.

This tool in connection with observations at different air relative humidity and with use of relatively simple technique enables one to evaluate the structure properties and its structure homogeneity, that is, the uniformity character of the porous stratified web material.

Utilization of this description was demonstrated during moistening kinetics of paper web of different composition from primary and secondary fibres on lignocellulosic and only cellulosic basis with different ash content.