Paper and board - Determination of bending stiffness - General principles for two-point, three-point and four-point methods

ISO 5628:2012 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 equations 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.

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Main informations

Collections

National standards and national normative documents

Publication date

March 2012

Number of pages

16 p.

Reference

NF ISO 5628

ICS Codes

85.060 Paper and board

Classification index

Q03-127

Print number

1 - 20/03/2012

International kinship

ISO 5628:2012

Sumary

Paper and board - Determination of bending stiffness - General principles for two-point, three-point and four-point 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 equations 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.

Table of contents

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Avant-propos
iv
Introduction
v
1 Domaine d'application
1
2 Références normatives
1
3 Termes et définitions
1
4 Symboles et unités
2
5 Théorie
2
6 Différentes méthodes d'essai de flexion
3
6.1 Méthode de flexion à deux points
3
6.2 Méthode à trois points
4
6.3 Calcul de la rigidité à la flexion à l'aide des méthodes à deux points et à trois points
5
6.4 Méthode à quatre points
6
7 Appareillage
7
8 Échantillonnage et préparation des échantillons
8
8.1 Échantillonnage
8
8.2 Conditionnement
8
8.3 Préparation des éprouvettes
8
9 Mode opératoire
8
10 Évaluation et calcul
8
11 Rapport d'essai
9
Bibliographie
10

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