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Low-temperature toughness is an indispensable functional indicator for winter logistics packaging paper, cold chain food cartons and alpine industrial paper. Ordinary paper is extremely prone to fiber embrittlement in low-temperature environments below 10 degrees Celsius, especially in freezing and cold storage conditions. Low temperature causes rapid loss of bound water in paper fibers, fracture of partial fiber cross-linking structures, and sharp decline in flexibility and folding resistance. Brittle paper is easy to crack, break and peel under slight extrusion, folding and collision, resulting in cold chain packaging rupture, commodity leakage and logistics damage. Most existing paper toughening technologies only work at room temperature and cannot resist low-temperature fiber embrittlement. Simply increasing wood pulp dosage raises production costs significantly, and still cannot solve the problem of toughness attenuation in ultra-low temperature environments. It has long been a technical difficulty for paper enterprises to maintain stable toughness and processing performance in cold environments. Shandong Ludao Energy Technology Co., Ltd. develops professional low-temperature toughness upgrading solutions. By building low-temperature resistant flexible fiber cross-linking network and locking internal bound water balance, we effectively inhibit fiber embrittlement and structural fracture under low temperature. The treated paper maintains excellent folding toughness, impact resistance and flexibility in cold storage and alpine environments, no brittle cracking and breakage, fully adapts to cold chain logistics and low-temperature industrial packaging scenarios, and solves the winter quality stability problem of packaging paper.