Systems and methods to produce treated cellulose filaments and thermoplastic composite materials comprising treated cellulose filaments

A method and system to produce treated Cellulose Filaments (CF) and CF products are provided. Feedstock comprising CF in a water solution are mixed with a debonder to produce a mixed stream. The mixed stream is filtered yielding separate filtered and filtrate streams. The filtrate stream comprises at least a portion of the debonder. The filtered stream is dried to produce treated CF. The debonder is one of an alcohol， glycol ether， ester-containing quaternary ammonium salt， amido amine quaternary ammonium salt， disubstituted amide or a mixture thereof. The filtrate stream may be recycled. The mixed stream may be washed before filtering to remove debonder. A thermoplastic polymer-treated Cellulose filament composite material is formable by associating the treated CF with a thermopolymer such as polyolefin， polyurethane (PU)， polypropylene (PP)， polyester (PE)， polylactic acid (PLA)， polyhydroxyalkanoates (PHA)， polyamide (PA)， and ethylene vinyl acetate (EVA) or a mixture.