prEN ISO 21181
(Main)Light conveyor belts - Determination of the relaxed elastic modulus (ISO/DIS 21181:2024)
Light conveyor belts - Determination of the relaxed elastic modulus (ISO/DIS 21181:2024)
ISo 21181:2013 specifies a test method for the determination of the relaxed elastic modulus of light conveyor belts according to ISO 21183-1 or other conveyor belts where ISO 9856 is not applicable.
Leichte Fördergurte - Bestimmung des relaxierten Elastizitätsmoduls (ISO/DIS 21181:2024)
Courroies transporteuses légères - Détermination du module d'élasticité relaxé (ISO/DIS 21181:2024)
L'ISO 21181:2013 spécifie une méthode d'essai permettant de déterminer le module d'élasticité relaxé des courroies transporteuses légères selon l'ISO 21183-1, ou d'autres courroies transporteuses lorsque l'ISO 9856 n'est pas applicable.
Naprave za kontinuirni transport - Lahki trakovi tračnih transporterjev - Ugotavljanje trajnega (relaksiranega) elastičnega modula traka (ISO/DIS 21181:2024)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2025
Naprave za kontinuirni transport - Lahki trakovi tračnih transporterjev -
Ugotavljanje trajnega (relaksiranega) elastičnega modula traka (ISO/DIS
21181:2024)
Light conveyor belts - Determination of the relaxed elastic modulus (ISO/DIS
21181:2024)
Leichte Fördergurte - Bestimmung des relaxierten Elastizitätsmoduls (ISO/DIS
21181:2024)
Courroies transporteuses légères - Détermination du module d'élasticité relaxé (ISO/DIS
21181:2024)
Ta slovenski standard je istoveten z: prEN ISO 21181
ICS:
53.040.10 Transporterji Conveyors
53.040.20 Deli za transporterje Components for conveyors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 21181
ISO/TC 41/SC 3
Light conveyor belts —
Secretariat: SAC
Determination of the relaxed elastic
Voting begins on:
modulus
2024-12-18
Courroies transporteuses légères — Détermination du module
Voting terminates on:
d'élasticité relaxé
2025-03-12
ICS: 53.040.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
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NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
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NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 21181:2024(en)
DRAFT
ISO/DIS 21181:2024(en)
International
Standard
ISO/DIS 21181
ISO/TC 41/SC 3
Light conveyor belts —
Secretariat: SAC
Determination of the relaxed
Voting begins on:
elastic modulus
Courroies transporteuses légères — Détermination du module
Voting terminates on:
d'élasticité relaxé
ICS: 53.040.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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Published in Switzerland Reference number
ISO/DIS 21181:2024(en)
ii
ISO/DIS 21181:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Principle . 2
6 Apparatus . 2
7 Test pieces . 2
7.1 Shape, dimensions, number and selection .2
7.2 Conditioning.3
8 Test method . 3
8.1 Test room condition .3
8.2 Procedure .3
9 Calculation and expression of results . 4
10 Test report . 6
Bibliography . 7
iii
ISO/DIS 21181:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts),
Subcommittee SC 3, Conveyor belts.
This third edition cancels and replaces the second edition(ISO 21181:2013), which has been technically
revised.
The main changes are as follows:
— The title is changed from Procedure to Test method in Clause 8
— Test room condition is added in 8.1
— Clause No. of Procedure is changed from 8 to 8.2
A list of all parts in the ISO 21181 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at w w w.iso.org/members.html.
iv
ISO/DIS 21181:2024(en)
Introduction
Many applications for light conveyor belts require that the belt is initially tensioned and there is no
subsequent change in belt length by adjustment of any rollers. In such cases, the tensioning force in the
belt changes throughout the life of the belt because of two effects: permanent stretch and relaxation of the
belt, both of which change its real elastic modulus. It is vital to have a means of establishing the way in
which the tensioning forces change; and this test applies a cyclic stretching between two defined states of
elongation over a large number of cycles. It has been found experimentally that the tensioning force drops in
an exponential way. It is possible to measure the tensioning force and then to calculate what is defined in this
International Standard as the “relaxed elastic modulus”. It is important to note that this is not a true elastic
modulus, because it includes an element of permanent stretch; but, except in cases where the permanent
stretch is relatively large, it is a measure of great practical value in determining final tensioning forces. This
International Standard is designed to meet the requirements for such applications.
v
DRAFT International Standard ISO/DIS 21181:2024(en)
Light conveyor belts — Determination of the relaxed
elastic modulus
1 Scope
This International Standard specifies a test method for the determination of the relaxed elastic modulus of
light conveyor belts according to ISO 21183-1 or other conveyor belts where ISO 9856 is not applicable.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
ISO 9856, Conveyor belts — Determination of elastic and permanent elongation and calculation of elastic modulus
ISO 18573, Conveyor belts — Test atmospheres and conditioning periods
ISO 21183-1, Light conveyor belts — Part 1: Principal characteristics and applications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
elastic modulus
force per unit of width of a conveyor belt
Note 1 to entry: It is expressed in newtons per millimetre width of belt and is represented in ISO 9856 by the symbol M.
Note 2 to entry: This definition of the term deviates from that normally used in engineering, which is expressed in
units of stress, i.e. a force per unit of cross-section, and represented by the symbol E (see, for example, ISO 527-4).
3.2
elastic modulus
force in newtons per unit of width required to extend a representative test
piece of light conveyor belting by 1 % of its original length
Note 1 to entry: The force is represented by the symbol k and, consequently, the elastic modulus is represented by
the symbol k . This value is also called the “tensile force for 1 % elongation per unit of width” or “k value”. It is
1 % 1 %
expressed in newtons per millimetre.
Note 2 to entry: In EN 10002-1:2001, the symbol k is used to represent the coefficient of proportionality.
3.3
relaxed elastic modulus
elastic modulus of a light conveyor belt after being cycled between
predetermined limits of extension for 500 cycles
Note 1 to entry: The k value of a new convey
...
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