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Micro impurities in pulp are invisible quality killers that affect high-grade paper fineness and uniformity. In the pulping, recycling and blending process, pulp will produce tiny residual impurities such as fine bark crumbs, degraded fiber fragments, colloidal particles and micro filler agglomerates. These micro impurities are too small to be filtered out by conventional screening equipment, and will remain in the pulp system for a long time. During paper forming, micro impurities will cause tiny pinholes, fine raised particles, local ink absorption difference and subtle surface roughness on the paper surface. For high-end coated paper, art paper and ultra-fine printing paper, these subtle defects will lead to blurred printing details and uneven gloss, directly reducing product grade. In addition, micro impurities will continuously accumulate in the circulating water system, accelerate slime reproduction and equipment fouling, and affect long-term stable production. Traditional pulp purification technology only removes large particle impurities and has no obvious effect on micro impurities. Shandong Ludao Energy Technology Co., Ltd. provides professional pulp micro impurity purification solutions. By adopting high-precision micro flocculation and selective separation technology, we accurately capture and remove all kinds of tiny invisible impurities in pulp, greatly improve pulp purity and fineness. The solution does not damage intact effective fibers, optimizes paper surface fineness and printing detail presentation, eliminates subtle paper defects, and supports enterprises to produce ultra-high-grade fine paper products.