ISO standard: Determining bending stiffness of paper and board

Recently NEN-ISO 5629:2018 was published. This standard specifies a method for the determination of the bending stiffness of paper and board using the resonance method. This method gives only a single result for each test piece tested, although in general, bending stiffness values may depend on which surface of the material forms the inner surface of the arc resulting from bending forces.
The bending stiffness of a very wide range of papers and boards can be measured using this method. However, for some materials the measured numerical values will not be strictly identical with bending stiffness as defined in this standard (World Packaging Standardisation Newsletter, April 2018).
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