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Paper knot defect is a stubborn quality problem that severely affects the surface fineness and high-end application of finished paper. Pulp knots are tiny undissolved fiber clusters, incompletely beaten crude fibers and condensed impurity agglomerates formed in the pulping and beating process. These dense fiber knots cannot be completely removed by conventional screening equipment, and will be mixed into the pulp system to participate in paper forming. After papermaking, knots form raised hard spots on the paper surface, resulting in uneven surface flatness, inconsistent local ink absorption and prominent printing texture defects. In high-gloss coated paper, fine art paper and precision printing paper production, fiber knots directly cause product downgrade and batch rejection. Moreover, hard knots will damage printing rollers and coating equipment during post-processing, increasing equipment wear and maintenance costs. Most traditional pulping processes improve knot problems only by prolonging beating time, which easily breaks effective fibers, reduces paper physical strength and increases pulping energy consumption, failing to fundamentally eliminate micro knots.Shandong Ludao Energy Technology Co., Ltd. launches professional paper knot resistance and pulp purification solutions. By optimizing fiber dissociation technology and dispersing condensed fiber clusters, we thoroughly eliminate micro fiber knots and crude fiber residues in pulp. The solution does not damage complete fiber structure, improves pulp uniformity and paper surface smoothness, eliminates knot-induced printing and coating defects, reduces equipment loss, and supports stable production of ultra-fine high-grade paper products.