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Caliper variation refers to the micro-thickness deviation of single sheet and batch paper, which is a key precision index restricting high-end paper standardized application. Many paper products have average thickness meeting the standard, but exist local micro-thickness difference on a single page and large caliper deviation between batches. Local thick spots cause uneven printing pressure, leading to partial ink over-deposition and pattern bulging; thin areas result in insufficient stiffness and easy penetration during lamination. For automated paper feeding equipment and precision gasket paper, tiny caliper variation will trigger counting errors, feeding jams and assembly precision deviation. Most paper mills adjust press roll gap and basis weight to control thickness, but mechanical adjustment cannot eliminate microscopic fiber flocculation and localized drainage differences, resulting in persistent hidden caliper fluctuation. Online thickness detection can only monitor data but not solve the fundamental structural problem.Shandong Ludao Energy Technology Co., Ltd. launches paper caliper uniformity optimization solutions. By homogenizing fiber micro-flocculation state, balancing regional drainage speed and stabilizing wet-web shrinkage, we eliminate microscopic thickness deviation within a single sheet and unify batch caliper data. The solution realizes full-page uniform thickness distribution, improves automatic equipment adaptability, eliminates thickness-induced processing defects, and meets the ultra-precision size requirements of high-end customized paper.