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Poor ink fixation is a common problem in printing paper production. Unoptimized paper surface structure leads to insufficient ink absorption and poor bonding fastness, resulting in ink falling off, blurring, pattern fading and dirty printing during printing and post-processing. This defect seriously affects the printing presentation effect and product grade, and is the main technical bottleneck restricting paper mills from supplying high-end printing enterprises. Shandong Ludao Energy Technology Co., Ltd. provides professional ink fixation and printability optimization solutions. By adjusting paper surface sizing formula and optimizing surface micro-structure, we significantly enhance ink adsorption capacity and bonding fastness, ensure clear printing layers, bright colors and no ink falling off. The optimized paper has excellent printing adaptability, suitable for offset printing, gravure printing and digital printing. It effectively reduces printing waste, improves paper comprehensive performance, and helps enterprises open up high-end printing paper markets and increase product profit margins.