BS ISO 5628:2019 – TC:2020 Edition
$134.27
Tracked Changes. Paper and board. Determination of bending stiffness. General principles for two-point, three-point and four-point methods
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 40 |
This document 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 four-point bending test methods.
For paper and paperboard in a low thickness range, the two-point bending method and the three-point bending method are suitable.
For corrugated fibreboard and board with a higher thickness, the four-point bending method is recommended.
The measurement conditions are defined in such a way that the test piece is not subjected to any significant permanent deformation during the test, nor is the range of validity of the formulae 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 [2].
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 22 | National foreword |
| 26 | Foreword |
| 27 | Introduction |
| 29 | 1 Scope 2 Normative references 3 Terms and definitions |
| 30 | 4 Symbols and units 5 Theory |
| 31 | 6 Different bending test methods 6.1 Two-point bending method |
| 32 | 6.2 Three-point bending method |
| 33 | 6.3 Calculation of bending stiffness using the two-point and three-point methods 6.3.1 Bending stiffness determination 6.3.2 Geometrical requirement 6.3.3 Allowable deflections and angles |
| 34 | 6.4 Four-point bending method 6.4.1 Geometry |
| 35 | 6.4.2 Calculation of bending stiffness 6.4.3 Measurement conditions 6.4.4 Geometrical and practical considerations |
| 36 | 7 Apparatus 8 Sampling and preparation of test pieces 8.1 Sampling 8.2 Conditioning 8.3 Preparation of test pieces 9 Procedure |
| 37 | 10 Evaluation and calculation 11 Test report |
| 38 | Bibliography |
