Abstract: A moist pulp fiberization device wherein picked moist pulp enters a tubular chamber behind a fiberizing blade mounted coaxially within the chamber, the fiberizing blade being configured to produce a turbulent vortex with little, if any, pressure differential within the chamber, the flow of pulp through the chamber being induced and controlled by drawing a vacuum on the trailing end of the chamber and providing an adjustable orifice plate intermediate the fiberizing blade and the trailing end of the chamber; if required, the fibers withdrawn from the chamber may be successively introduced into one or more additional chambers of like configuration to effect substantially complete fiber separation, whereupon the separated fibers are discharged for subsequent processing and use.