GB/T 22364-2008 "Determination of the bending stiffness of paper and Cardboard" stipulates the measurement method of the bending stiffness of paper and Cardboard, covering the measurement principle, equipment, sample preparation, test steps and result calculation. By standardizing the operation process and index requirements, it provides a standard basis for the accurate measurement of the ability of paper and Cardboard to resist bending deformation, which helps to evaluate the physical performance of paper rigidity and guide the production and application of paper.