Abstract: A cellulose nanofibrils production method comprising the steps of: identifying a desired level of cellulose nanofibrils pulp purity, partially refining pulp to produce a cellulose nanofibrils pulp purity between 5% and 15% less than the desired desired purity, and then separating out the cellulose nanofibrils from the longer fibers to produce the desired level of cellulose nanofibrils pulp purity.

Abstract: A device including a hollow body defining axially extending compartments therein for receiving a slurry of pulp fibers in a carrying flow. The device includes a stationary screen within the hollow body defining a slurry compartment on one side of the screen, and a screened compartment on the other side of the screen. The hollow body also includes a slurry inlet into the slurry compartment, an elutriation suction outlet in communication with the slurry inlet, and elutriation nozzles into the slurry compartment. The device also includes an elutriation pump outside of the hollow body, the elutriation suction outlet being in fluid communication the elutriation pump, and the elutriation pump being in fluid communication with the elutriation nozzles.

Abstract: Disclosed is a fly ring adapted to be used in a rotary drum filtering apparatus, and a method of forming such a fly ring. The fly ring comprises a plurality of ring segments, each ring segment being laser cut. Each ring segment has a first end which overlaps a second end of an adjacent ring segment, forming a lapped joint. Each ring segment first and second end has at least two spaced apart through holes, the through holes of the first end being aligned with the through holes of the second end. A custom fastener extends through the first end and second end aligned through holes.

Abstract: A drum structure, for a rotary drum filtering apparatus, comprising: a generally annular supporting drum, and a plurality of rib elements carried by the supporting drum longitudinally extending along the circumference of the drum generally in the longitudinal direction of the drum. A duplex stainless steel cover plate extends between two rib elements. A single supporting element supports the cover plate extending between each pair of two rib elements.