Air and vapour transfer ability of a sheet of paper: pulp refining, fine addition and wet sheet pressing effects

摘要

This article deals with the air and vapour transfer ability of a sheet of paper. This sheet is obtained by draining, under a fixed depression, an aqueous suspension of a unbleached cellulose paper pulp made of long Kraft-cooked pine (pinus pinaster) wood fibers. The effect of pulp refining time and fine addition in this pulp is estimated. The various observed behaviours are connected with two types of measurements of natural and vacuum drainage of the initial suspension. The effect of pressing on the wet sheet is then considered.