News

Flex fatigue resistance refers to the ability of paper to resist performance degradation after repeated folding and bending, which is a key durability indicator for book paper, file paper and folding packaging paper. In long-term use and repeated folding, ordinary paper will generate invisible fatigue cracks inside the fiber structure. With the increase of bending times, micro cracks gradually expand, resulting in folding breakage, surface cracking and local strength attenuation. For books, brochures and reusable folding cartons, poor flex fatigue resistance leads to short service life, easy damage and poor user experience. Traditional toughening treatments only improve the initial folding resistance but cannot enhance the anti-fatigue ability, and the paper will still suffer from fatigue damage after long-term repeated use. Shandong Ludao Energy Technology Co., Ltd. launches professional paper flex fatigue resistance upgrading solutions. By building a flexible and tough fiber cross-linking network and enhancing structural stress dispersion ability, we make the paper uniformly bear repeated bending stress, avoid local stress concentration and micro crack expansion. The solution effectively delays fiber fatigue aging, greatly improves the maximum folding times and long-term durability of paper, maintains intact surface and structural stability after long-term use, and significantly improves the service life and grade of high-end printed and packaging paper.