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Sizing uniformity is the key core factor determining consistent water resistance and printing performance of batch paper. Uneven surface sizing is a common hidden problem in papermaking production, which is mainly manifested in inconsistent sizing degree in different areas of the paper surface. Local excessive sizing leads to hard surface, poor ink absorption and printing hollow spots; insufficient local sizing causes fast water penetration, easy ink bleeding and poor water resistance. Uneven sizing will lead to great differences in processing performance of the same batch of paper, resulting in unstable printing effect, inconsistent water resistance indicators and batch quality divergence. Most paper mills adjust sizing agent dosage and coating speed empirically, which cannot solve the microscopic uneven distribution of sizing liquid, and it is difficult to achieve full-page uniform sizing effect. Long-term uneven sizing will increase the rate of defective products and restrict the stable delivery of high-standard orders. Shandong Ludao Energy Technology Co., Ltd. provides precise sizing uniformity optimization solutions. By improving sizing liquid dispersion activity and surface adhesion uniformity, we realize microscopic uniform coverage of sizing components on the paper surface, eliminate local excessive or insufficient sizing defects. The solution balances the overall water resistance and ink absorption performance of paper, ensures consistent processing performance of the whole page and uniform batch quality, and greatly improves the stability of high-grade paper production and delivery.