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Layer bonding strength is the core technical index of multi-layer composite paper, corrugated base paper and thick board paper. Unstable interlayer bonding is a common defect in composite paper production, manifested as interlayer hollowing, edge delamination, layered peeling and poor overall structural integrity. During die-cutting, folding and pressing processing, unbonded layers are easy to separate, resulting in packaging box bulging, board layering and finished product scrapping. The main causes include inconsistent fiber structure of each layer, uneven adhesive penetration, unbalanced wet web moisture and interfacial tension difference between layers. Most manufacturers improve bonding effect by increasing adhesive dosage, which easily causes glue overflow, surface contamination and increased production cost, and cannot solve the fundamental interfacial compatibility problem. Mechanical pressing adjustment also fails to achieve uniform micro-bonding of the whole paper surface. Shandong Ludao Energy Technology Co., Ltd. launches professional interlayer bonding optimization solutions. By improving interfacial fusion activity of multi-layer wet web and balancing micro-pressure penetration, we realize tight and uniform interlayer bonding without excessive glue consumption. The solution eliminates delamination and hollowing defects, improves overall structural tightness of composite paper, and stabilizes processing performance and finished product qualification rate.