prEN ISO 22721

Conveyor belts - Specification for rubber- or plastics-covered conveyor belts of textile construction for underground mining (ISO/DIS 22721:2022)

ISO 22721:2007 specifies requirements for rubber- or plastics-covered conveyor belting of textile construction for underground mining on flat or troughed idlers. It is not applicable to light conveyor belts as described in ISO 21183‑1. ISO 22721:2007 does not include requirements for plastics covers.

Fördergurte - Anforderungen an Textilfördergurte mit Gummi- oder Kunststoff-Deckplatten für Anwendungen unter Tage (ISO/DIS 22721:2022)

Courroies transporteuses - Spécification pour courroies transporteuses à structure textile recouvertes de caoutchouc ou de plastique, pour utilisation dans les mines souterraines (ISO/DIS 22721:2022)

L'ISO 22721:2007 spécifie les exigences relatives aux courroies transporteuses à structure textile recouvertes de caoutchouc ou de plastique pour utilisation dans les mines souterraines, disposées sur rouleaux plats ou en auge. Elle ne s'applique pas aux courroies transporteuses légères. L'ISO 22721:2007 n'inclut pas les exigences relatives aux revêtements plastiques.

Naprave za kontinuirni transport - Trakovi tračnih transportejev - Zahteve za tračne transportne trakove z gumeno ali plastično oblogo ter tekstilnim vložkom za podzemno rudarstvo (ISO/DIS 22721:2022)

General Information

• Status: Not Published
• Publication Date: 06-Nov-2023
• ICS: 53.040.20 - Components for conveyors
• Technical Committee: CEN/TC 188 - Conveyor belts
• Drafting Committee: CEN/TC 188 - Conveyor belts
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 06-Mar-2023
• Completion Date: 06-Mar-2023
• Ref Project: oSIST prEN ISO 22721:2022 - Conveyor belts - Specification for rubber- or plastics-covered conveyor belts of textile construction for underground mining (ISO/DIS 22721:2022)

Relations

• Revises: EN ISO 22721:2007 - Conveyor belts - Specification for rubber- or plastics-covered conveyor belts of textile construction for underground mining (ISO 22721:2007)
• Effective Date: 18-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 22721:2022
01-december-2022

Naprave za kontinuirni transport - Trakovi tračnih transportejev - Zahteve za tračne

transportne trakove z gumeno ali plastično oblogo ter tekstilnim vložkom za
podzemno rudarstvo (ISO/DIS 22721:2022)

Conveyor belts - Specification for rubber- or plastics-covered conveyor belts of textile

construction for underground mining (ISO/DIS 22721:2022)
Fördergurte - Anforderungen an Textilfördergurte mit Gummi- oder Kunststoff-
Deckplatten für Anwendungen unter Tage (ISO/DIS 22721:2022)

Courroies transporteuses - Spécification pour courroies transporteuses à structure textile

recouvertes de caoutchouc ou de plastique, pour utilisation dans les mines souterraines

(ISO/DIS 22721:2022)
Ta slovenski standard je istoveten z: prEN ISO 22721
ICS:
53.040.20 Deli za transporterje Components for conveyors
73.100.40 Oprema za vleko in dviganje Haulage and hoisting
equipment
oSIST prEN ISO 22721:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 22721:2022
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oSIST prEN ISO 22721:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 22721
ISO/TC 41/SC 3 Secretariat: SAC
Voting begins on: Voting terminates on:
2022-10-10 2023-01-02
Conveyor belts — Specification for rubber- or plastics-
covered conveyor belts of textile construction for
underground mining

Courroies transporteuses — Spécification pour courroies transporteuses à structure textile recouvertes de

caoutchouc ou de plastique, pour utilisation dans les mines souterraines
ICS: 73.100.40; 53.040.20
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 22721:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
---------------------- Page: 3 ----------------------
oSIST prEN ISO 22721:2022
ISO/DIS 22721:2022(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 22721
ISO/TC 41/SC 3 Secretariat: SAC
Voting begins on: Voting terminates on:
Conveyor belts — Specification for rubber- or plastics-
covered conveyor belts of textile construction for
underground mining

Courroies transporteuses — Spécification pour courroies transporteuses à structure textile recouvertes de

caoutchouc ou de plastique, pour utilisation dans les mines souterraines
ICS: 73.100.40; 53.040.20
This document is circulated as received from the committee secretariat.
COPYRIGHT PROTECTED DOCUMENT
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2022
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

NOT BE REFERRED TO AS AN INTERNATIONAL

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

IN ADDITION TO THEIR EVALUATION AS

or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,

TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
USER PURPOSES, DRAFT INTERNATIONAL
CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
Phone: [phone]
WHICH REFERENCE MAY BE MADE IN
Reference number
Email: [e-mail]
NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 22721:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
© ISO 2022 – All rights reserved
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
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oSIST prEN ISO 22721:2022
ISO/DIS 22721:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 2

4 Construction ............................................................................................................................................................................................................. 2

5 Length .............................................................................................................................................................................................................................. 2

6 Width ................................................................................................................................................................................................................................ 3

7 Rubber cover ............................................................................................................................................................................................................ 4

8 Tolerances on total belt thickness and cover thickness ............................................................................................ 4

8.1 Tolerance on total belt thickness ........................................................................................................................................... 4

8.2 Tolerance on cover thickness ........................................................................................................................................... .......... 4

9 Transverse fabric joints in multi-ply belting ........................................................................................................................ 5

9.1 General ........................................................................................................................................................................................................... 5

9.2 Outer plies ........................................................................................................................................... ........................................................ 5

9.3 Inner plies ................................................................................................................................................................................................... 5

9.4 Adjacent plies and non-adjacent plies ................................................................................................................................ 5

9.5 Joints in same ply .................................................................................................................................................................................. 5

9.6 Mono-ply, duo-ply and solid woven belting ................................................................................................................... 5

10 Longitudinal fabric joints ...........................................................................................................................................................................5

10.1 Multi-ply belting .................................................................................................................................................................................... 5

10.1.1 Spacing of joints .................................................................................................................................................................. 5

10.1.2 Number of joints ................................................................................................................................................................. 5

10.2 Fabric joints in duo-ply belting ................................................................................................................................................ 6

10.3 Longitudinal joints in solid woven and mono-ply belting ................................................................................ 6

11 Elongation ................................................................................................................................................................................................................... 6

12 Full thickness tensile strength .............................................................................................................................................................6

13 Adhesion ....................................................................................................................................................................................................................... 6

14 Troughability ...................................................................... ..................................................................................................................................... 7

15 Sampling ....................................................................................................................................................................................................................... 7

16 Designation ................................................................................................................................................................................................................ 7

17 Identification ........................................................................................................................................................................................................... 9

Annex A (informative) Items to be agreed between manufacturer and purchaser .......................................10

Annex B (informative) Helpful information to be supplied by the purchaser .....................................................11

Annex C (informative) Lateral drift (straight running) ...............................................................................................................13

Bibliography .............................................................................................................................................................................................................................14

iii
© ISO 2022 – All rights reserved
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oSIST prEN ISO 22721:2022
ISO/DIS 22721:2022(E)
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).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

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 wasprepared by TechnicalCommittee ISO/TC 41, Pulleys and belts (includingveebelts),

Subcommittee SC 3, Conveyorbelts.

This second edition cancels and replaces first edition (ISO 22721:2007), which has been technically

revised.
The main changes compared to the previous edition are as follows:

The part of warning was deleted as there is a reference to EN 14973 in Clause 2, 16.1, 16.2,17, B2 and B3.

Take out the comment and related widths from Table 3.

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 www.iso.org/members.html.
© ISO 2022 – All rights reserved
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oSIST prEN ISO 22721:2022
DRAFT INTERNATIONAL STANDARD ISO/DIS 22721:2022(E)
Conveyor belts — Specification for rubber- or plastics-
covered conveyor belts of textile construction for
underground mining
1 Scope

This document specifies requirements for rubber- or plastics-covered conveyor belting of textile

construction for underground mining on flat or troughed idlers. It is not applicable to light conveyor

belts as described in ISO 21183-1.

This document does not include requirements for plastics covers. These will need to be agreed upon by

the manufacturer and purchaser, taking into account the type of plastics to be used.

Related items that are not requirements of this document, but which it is recommended be agreed upon

by the manufacturer and purchaser, are included in Annex A.

Details recommended to be supplied by the purchaser of belting with an enquiry are given in Annex B.

The ability of a belt to run straight cannot be assessed until the belt is installed. Requirements for this

are, therefore, outside the scope of this document; nevertheless, recommendations for lateral drift are

given in Annex C.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties

ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests

ISO 252, Conveyor belts — Adhesion between constitutive elements — Test methods
ISO 282, Conveyor belts — Sampling

ISO 283, Conveyor belts — Full thickness tensile strength, elongation at break and elongation at the

reference force — Test method

ISO 583, Conveyor belts with a textile carcass — Total belt thickness and thickness of constitutive

elements — Test methods
ISO 703, Conveyor belts — Transverse flexibility (troughability) — Test method

ISO 1120, Conveyor belts — Determination of strength of mechanical fastenings — Static test method

ISO 4649:2002, Rubber, vulcanized or thermoplastic — Determination of abrasion resistance using a

rotating cylindrical drum device
ISO 10247, Conveyor belts — Characteristics of covers — Classification

ISO 16851, Textile conveyor belts — Determination of the net length of an endless (spliced) conveyor belt

EN 14973:2015, Conveyor belts for use in underground installations — Electrical and flammability safety

requirements
© ISO 2022 – All rights reserved
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oSIST prEN ISO 22721:2022
ISO/DIS 22721:2022(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
slab belting

conveyor belting made in wide widths and long lengths for subsequent slitting and cutting into

narrower widths and shorter lengths to suit individual conveyor installations
3.2
solid woven belting

conveyor belting consisting of a carcass of more than one ply, the plies being interlocked in the weave or

bound together by binding threads in the course of weaving
3.3
mono-ply belting
conveyor belting with a carcass consisting of one ply of woven textile fabric
3.4
duo-ply belting

conveyor belting with a carcass consisting of two plies of woven textile fabric bonded together by an

intermediate layer of elastomer of sufficient thickness to allow the incorporation of a tension element

in the joint
3.5
multi-ply belting

conveyor belting with a carcass of two or more plies of woven textile fabric, the adjacent plies being

bonded together by an intermediate layer of elastomer
3.6
primary yarn

load-carrying yarn which contributes more than 50 % of the full thickness tensile strength

3.7
secondary ya
...