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Internal layer gaps are invisible structural defects widely existing in multi-layer paper and thick paper. Unreasonable multi-layer forming process, insufficient interlayer fusion and residual air in the paper will form tiny gaps between fiber layers. These hidden gaps reduce the overall compactness and structural strength of paper, easily cause interlayer separation, bulging and delamination during folding, embossing and pressing processing, and greatly reduce the pressure resistance and service stability of thick paper products. In high-grade cardboard and multi-layer composite paper production, layer gaps are the core technical problems restricting product grade improvement. Shandong Ludao Energy Technology Co., Ltd. launches professional paper layer gap elimination solutions. By optimizing multi-layer fiber fusion technology and enhancing interlayer bonding activity, we fill internal micro gaps, realize integrated tight combination of paper layers, and greatly improve the overall structural compactness and integrity of thick paper. The solution effectively solves delamination and bulging defects, improves paper compression resistance and processing performance, and supports enterprises to produce high-quality thick paper and composite paper products.