ISO 5628:2019
(Main)Paper and board — Determination of bending stiffness — General principles for two-point, three-point and four-point methods
Paper and board — Determination of bending stiffness — General principles for two-point, three-point and four-point methods
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].
Papier et carton — Détermination de la rigidité à la flexion — Principes généraux pour les méthodes à deux points, à trois points et à quatre points
Papir, karton in lepenka - Ugotavljanje upogibne togosti s statično metodo - Splošna načela za dvo-, tri- in štiritočkovne metode
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SLOVENSKI STANDARD
SIST ISO 5628:2020
01-november-2020
Papir, karton in lepenka - Ugotavljanje upogibne togosti s statično metodo -
Splošna načela za dvo-, tri- in štiritočkovne metode
Paper and board -- Determination of bending stiffness -- General principles for two-point,
three-point and four-point methods
Papier et carton -- Détermination de la rigidité à la flexion -- Principes généraux pour les
méthodes à deux points, à trois points et à quatre points
Ta slovenski standard je istoveten z: ISO 5628:2019
ICS:
85.060 Papir, karton in lepenka Paper and board
SIST ISO 5628:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ISO 5628:2020
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SIST ISO 5628:2020
INTERNATIONAL ISO
STANDARD 5628
Third edition
2019-05
Paper and board — Determination of
bending stiffness — General principles
for two-point, three-point and four-
point methods
Papier et carton — Détermination de la rigidité à la flexion —
Principes généraux pour les méthodes à deux points, à trois points et à
quatre points
Reference number
ISO 5628:2019(E)
©
ISO 2019
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SIST ISO 5628:2020
ISO 5628:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST ISO 5628:2020
ISO 5628:2019(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units . 2
5 Theory . 2
6 Different bending test methods . 3
6.1 Two-point bending method . 3
6.2 Three-point bending method . 4
6.3 Calculation of bending stiffness using the two-point and three-point methods . 5
6.3.1 Bending stiffness determination . 5
6.3.2 Geometrical requirement . 5
6.3.3 Allowable deflections and angles . 5
6.4 Four-point bending method .
...
INTERNATIONAL ISO
STANDARD 5628
Third edition
2019-05
Paper and board — Determination of
bending stiffness — General principles
for two-point, three-point and four-
point methods
Papier et carton — Détermination de la rigidité à la flexion —
Principes généraux pour les méthodes à deux points, à trois points et à
quatre points
Reference number
ISO 5628:2019(E)
©
ISO 2019
---------------------- Page: 1 ----------------------
ISO 5628:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 5628:2019(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units . 2
5 Theory . 2
6 Different bending test methods . 3
6.1 Two-point bending method . 3
6.2 Three-point bending method . 4
6.3 Calculation of bending stiffness using the two-point and three-point methods . 5
6.3.1 Bending stiffness determination . 5
6.3.2 Geometrical requirement . 5
6.3.3 Allowable deflections and angles . 5
6.4 Four-point bending method . 6
6.4.1 Geometry . 6
6.4.2 Calculation of bending stiffness . 7
6.4.3 Measurement conditions . 7
6.4.4 Geometrical and practical considerations . 7
7 Apparatus .
...
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