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Fiber curling is an invisible microscopic defect that seriously restricts the improvement of paper physical quality. In the pulping and high-temperature drying process, fibers are prone to irregular curling and twisting due to mechanical shearing and thermal stress. A large number of curled fibers cannot form effective interweaving and bonding, resulting in loose paper structure, reduced tensile strength, poor folding resistance and unstable dimensional accuracy. Curled fibers also cause uneven fiber distribution in the forming process, leading to thickness deviation, surface micro-wrinkles and inconsistent batch quality. Many paper enterprises only focus on fiber fibrillation and ignore fiber straightness control, resulting in low fiber utilization rate and always unqualified paper physical indicators. Shandong Ludao Energy Technology Co., Ltd. provides professional fiber straightening and anti-curling solutions. Through targeted fiber stress relief technology and pulping process optimization, we effectively correct fiber curling and twisting problems, improve fiber straightness and interweaving uniformity, maximize the bonding area between fibers, and comprehensively enhance paper structural compactness and physical strength. The solution significantly improves fiber utilization rate, reduces raw material waste, and fundamentally improves the overall quality stability of finished paper.