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Paper cleanliness is a core standard for measuring high-end paper quality, which directly affects product appearance, printing precision and customer reputation. In the actual production process, fine fiber debris, tiny dust, residual chemical impurities and micro sticky dirt in pulp and circulating water will form tiny spots, dark dots and fine flaws on the paper surface. These subtle cleanliness defects are difficult to remove by traditional screening and cleaning processes, and will be obviously amplified in high-precision printing and fine packaging scenarios, leading to product downgrade and customer complaints. For high-end cultural paper, food packaging paper and medical paper, surface cleanliness is an indispensable quality threshold. Shandong Ludao Energy Technology Co., Ltd. launches systematic paper cleanliness upgrading solutions. Through deep pulp purification, circulating water precision filtration and micro-impurity adsorption technology, we thoroughly remove invisible micro impurities in the production system, eliminate surface flaws and spot defects, and achieve ultra-clean paper surface effect. The whole process is environmentally friendly and efficient, does not damage fiber performance, and helps enterprises stably produce high-cleanliness premium paper products to meet high-end market access standards.