This standard specifies three methods for determining the bending stiffness of paper and paperboard: constant speed bending method, Taber stiffness tester method, and resonance method. The constant speed bending method of this standard is applicable to paper and paperboard with a bending stiffness of 20 mN to 10000 mN. The Taber type stiffness tester method in this standard is mainly applicable to high quantity paper and paperboard. The Taber type stiffness tester in this standard does not include low range Taber type stiffness testers using a bending length of 10 mm. The resonance method of this standard is applicable to most paper and paperboard, and is not applicable to paper and paperboard that may produce layering, obvious curling during measurement, as well as paper with a weight less than 40 g/m2. This standard applies to the composition of corrugated cardboard, but does not apply to corrugated cardboard. Note: Measurement results obtained using different test methods cannot be converted to each other. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 450 Paper and Boardboard, Sampling and Determination of Longitudinal and Transverse, Front and Back Faces of Samples (GB/T 450-2008, ISO 186; 2002, MOD) GB/T 451.2 Paper and Boardboard Quantitative Determination (GB/T 451.2-2002, eqv ISO 536:1995) GB/T 10739 Standard Atmospheric Conditions for Paper, Boardboard, and Pulp Sample Handling and Testing (GB/T 10739-2002, eqv ISO 187:1990)
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