ISO 5628:2012 PDF

Scope: This International Standardqd specifies three test methods for determining the bending stiffness of paper and paperboard. The test methods differ in the type of loading mode, thus giving rise to the two-point, three-point and fourpoint bending test methods. Forpaperand paperboard in alowthickness range, the two-point bending method and the three-point bending method are suitable. For corrugated fibreboard and board with a higher thickness, the fourpoint bending method is recommended. The measurement conditions are defined in such a Way that the test piece is not subjected to any signifficant permanent deformation during the test, nor is the range of validity of the eduations for calculating the bending stiffness exceeded. In these bending tests, the test pieces of paper and board are regarded as "beams "as defined by the science of the strength of materials, see Reference [1].

ISO 5628:2012 Referenced Document

ISO 186 Paper and board - Sampling to determine average quality
ISO 3034 Corrugated fibreboard - Determination of single sheet thickness
ISO 534 Paper and board - Determination of thickness, density and specific volume

2019 ISO 5628:2019 Paper and board — Determination of bending stiffness — General principles for two-point, three-point and four-point methods
2012 ISO 5628:2012 Paper and board - Determination of bending stiffness - General principles for two-point, three-point and four-point methods
1990 ISO 5628:1990 Paper and board; determination of bending stiffness by static methods; general principles