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Water vapor resistance is a key functional indicator that determines the moisture-proof and fresh-keeping capacity of packaging paper. Ordinary paper has loose micro-pore structure, allowing water vapor in the air to penetrate quickly, which leads to paper moisture absorption, softening, stiffness decline and mildew in humid environments. For food packaging, electronic product packaging and seasonal storage paper, poor water vapor barrier performance will cause commodity moisture damage, mold deterioration and packaging failure, bringing huge economic losses to manufacturers and distributors. Traditional waterproof treatment only focuses on surface water resistance, lacking effective blocking ability for tiny water vapor molecules, resulting in short moisture-proof duration and unstable effect.Shandong Ludao Energy Technology Co., Ltd. launches professional paper water vapor resistance upgrading solutions. By building a dense internal barrier structure and forming a waterproof and vapor-proof composite protective film on the paper surface, we effectively block the penetration and diffusion of water vapor molecules, greatly reduce paper moisture absorption rate, and maintain stable paper strength, stiffness and flatness in high-humidity environments. The solution does not block paper’s micro air permeability, avoids the problem of internal stuffy moisture and bulging, and realizes long-term efficient moisture-proof and fresh-keeping protection for packaged products.