Textiles -- Man-made fibres -- Determination of dye uptake of cationic dyeable modified polyester fibres

This document specifies a method for determining the dye uptake of cationic dyeable modified polyester fibres by using cationic dye. It is applicable to cationic dyeable modified polyester fibres, including staple fibres and filament yarns. It is not applicable to polyester partially oriented yarns.

Textiles -- Fibres fabriquées -- Détermination de l’absorption des colorants par les fibres de polyester à pression normale

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Status
Published
Publication Date
16-Sep-2018
Current Stage
6060 - International Standard published
Start Date
17-Aug-2018
Completion Date
17-Sep-2018
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ISO 20920:2018 - Textiles -- Man-made fibres -- Determination of dye uptake of cationic dyeable modified polyester fibres
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INTERNATIONAL ISO
STANDARD 20920
First edition
2018-09
Textiles — Man-made fibres —
Determination of dye uptake of cationic
dyeable modified polyester fibres
Textiles — Fibres fabriquées — Détermination de l’absorption des
colorants par les fibres de polyester à pression normale
Reference number
ISO 20920:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO 20920:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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

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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2018 – All rights reserved
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ISO 20920:2018(E)
Contents  Page

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

Introduction ..................................................................................................................................................................................................................................v

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

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

3  Terms and definitions ..................................................................................................................................................................................... 1

4  Principle ........................................................................................................................................................................................................................ 2

5  Reagents and materials ................................................................................................................................................................................. 2

6  Apparatus ..................................................................................................................................................................................................................... 2

7  Test preparation ................................................................................................................................................................................................... 2

7.1 Pre-treatment of samples .............................................................................................................................................................. 2

7.2 Conditioning of samples ................................................................................................................................................................. 3

7.3 Preparation of dye stock solutions ........................................................................................................................................ 3

8  Procedure..................................................................................................................................................................................................................... 3

9  Calculation and expression of the results .................................................................................................................................. 3

10  Precision of the method ................................................................................................................................................................................ 4

11  Test report ................................................................................................................................................................................................................... 4

Annex A (informative) Precision experiment.............................................................................................................................................. 5

Bibliography ................................................................................................................................................................................................................................ 6

© ISO 2018 – All rights reserved iii
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ISO 20920:2018(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 on 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 the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 38, Textiles, Subcommittee SC 23, Fibres

and yarns.

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.
iv © ISO 2018 – All rights reserved
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ISO 20920:2018(E)
Introduction

Typical polyester fibres as sold on the market can be dyed at temperatures above 100 °C and high

pressures by using disperse dye. As part of the highly modified polyester products, cationic dyeable

polyester (CDP) can be dyed at lower temperatures by using cationic dye. For some modified species in

particular, easy cationic dyeable polyester (ECDP) can be dyed under 100 °C at normal pressure. Due to

this key improvement, cationic dyeable modified polyester fibres are becoming more and more popular

on the market. This test method is used to evaluate the dye uptake rate of cationic dyeable modified

polyester fibres by using cationic dye.
© ISO 2018 – All rights reserved v
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INTERNATIONAL STANDARD ISO 20920:2018(E)
Textiles — Man-made fibres — Determination of dye
uptake of cationic dyeable modified polyester fibres

WARNING — The use of this document can involve hazardous materials, operations, and

equipment. It does not purport to address all of the safety risks associated with its use.

1  Scope

This document specifies a method for determining the dye uptake of cationic dyeable modified polyester

...

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