Application of chemical additives is an effective approach to improve the properties of recycled paper products and process, which new additives introduction are always under challenge and question. Recently, Cellulosic Nano Fibers (CNF) as a nano-bio-pmaterialarticle originated from the plant fibers received a great attention in different exareaploitations such as papermaking, which acquainted the performance assessments regarding to the various conditions of the different pfurnishesulp . With this respect, the effect of CNF (0.1, 0.15 & 0.2% OD pulp) on the well-known performance of cationic starch (CS) (0.5, 0.75 & 1% OD pulp), as the most famous polymer used in papermaking, were studied in the pulp recycled from packaging brown waste papers. The results showed that addition of CNF after starchpost ddition didn’ot improved pulp retention, but also declined starch role performance in the recycled pulp retention improvement boost, continuously and respectively corresponding to CNF usage increment. Also, the Rresults obtained from of dynamic drainage jar approved retention data, too; , and the least pulp loss was occurred at the lowest CNF addition. Individually addition of CNF decreased the pulp freeness (CSF) and the postits addition after starch didn’tno positively affected CSF, significantly; and often decreased it. The CNF addition to the starch contained pulp had no meaningfully effect on tensile and burst strengths of the recycled paper and diminished tear strength, too. Generally, unlike the traditional retention-drainage systems comprising cationic polymer/nanoparticles, the application of cationic starch/cellulose nanofibers revealed no positive effects on the properties of pulp and paper recycled from packaging brown papers.
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