Method of liquid treating cellulose fibres with elastic pressure shocks

In a method of treating cellulose fibers in a cellulose pulp wherein the pulp consistency is in the range of 10-90%, and wherein intermittent elastic compression forces are applied to the fibers, the improvement wherein the applying of elastic forces comprises the steps of:

• positioning a rotatable paddle wheel eccentrically within a container so that paddle arms of the paddle wheel at least closely approach an interior wall portion of said container intermittently,
• providing said wall portion with an elastic surface,
• introducing the fibers into the container,
• rotating the paddle wheel to intermittently elastically compress the fibers against said elastic surface to apply elastic pressure shocks to the fibers for a duration not exceeding one second and of a magnitude causing pressure in the interior of the fibers to exceed 0.2 atmospheres excess pressure, whereby liquid is expelled from the fibers and the fibers are not permanently deformed,
• allowing the fibers to expand following the pressure shocks to adsorb liquid, and
• repeating said steps of applying shocks and allowing the fibers to expand, until the fibers are completely impregnated with liquid.