Silk -- Test method for determining the size of silk yarns

This document specifies the test method for determining the size of silk yarns in all types of package forms. It is applicable to various kinds of silk yarns. It is not applicable to spun silk yarns.

Soie -- Méthode d'essai pour déterminer le titre des fils de soie

General Information

Status
Published
Publication Date
30-Oct-2018
Current Stage
6060 - International Standard published
Start Date
08-Oct-2018
Completion Date
31-Oct-2018
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ISO 21046:2018 - Silk -- Test method for determining the size of silk yarns
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INTERNATIONAL ISO
STANDARD 21046
First edition
2018-11
Silk — Test method for determining
the size of silk yarns
Soie — Méthode d'essai pour déterminer le titre des fils de soie
Reference number
ISO 21046:2018(E)
ISO 2018
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ISO 21046:2018(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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ii © ISO 2018 – All rights reserved
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ISO 21046:2018(E)
Contents Page

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

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

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

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

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

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

5 Apparatus ..................................................................................................................................................................................................................... 2

6 Atmosphere for conditioning and testing .................................................................................................................................. 3

7 Procedure..................................................................................................................................................................................................................... 3

7.1 Sampling ....................................................................................................................................................................................................... 3

7.1.1 Sample length ..................................................................................................................................................................... 3

7.1.2 Sample quantity ................................................................................................................................................................ 3

7.2 Preparation ................................................................................................................................................................................................ 3

7.3 Weighing ....................................................................................................................................................................................................... 3

7.4 Data control ............................................................................................................................................................................................... 4

7.5 Conditioned size .................................................................................................................................................................................... 4

8 Calculations................................................................................................................................................................................................................ 4

8.1 General ........................................................................................................................................................................................................... 4

8.2 Average size ............................................................................................................................................................................................... 5

8.3 Size deviation ........................................................................................................................................................................................... 5

8.4 Maximum size deviation ................................................................................................................................................................. 5

8.5 Conditioned size .................................................................................................................................................................................... 5

8.6 CV .................................................................................................................................................................................................................

size 6

9 Test report ................................................................................................................................................................................................................... 6

Annex A (informative) Determination of drying time ........................................................................................................................ 7

Annex B (informative) Tolerance between conditioned size and average size ........................................................8

Annex C (informative) Example of size test results for silk yarn ............................................................................................ 9

Bibliography .............................................................................................................................................................................................................................11

© ISO 2018 – All rights reserved iii
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ISO 21046:2018(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 21046:2018(E)
Introduction

Silk yarns are made of natural silk fibres, including raw silk, tussah silk, dupion silk, thrown silk, etc.

Due to the intrinsic unevenness of the property of silk fibres and its manufacturing technique differing

from yarns made of staple fibres, the size (linear density) deviation of the silk yarns, such as raw silk

reeled from cocoon baves, is much bigger than that of the conventional yarns covered by ISO 2060.

Therefore, when measuring the size of silk yarns, the sample quantity, sample length, test device,

drying temperature, test items, calculation method of the results and tolerance for weighing errors are

all different from that for the conventional yarns. These special requirements are not prescribed in

ISO 2060. This document covers special size test regulations for silk yarns which are not covered by

ISO 2060.
© ISO 2018 – All rights reserved v
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INTERNATIONAL STANDARD ISO 21046:2018(E)
Silk — Test method for determining the size of silk yarns
1 Scope

This document specifies the test method for determining the size of silk yarns in all types of

package forms.
It is applicable to various kinds of silk yarns.
It is not applicable to spun silk yarns.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 139, Textiles — Standard atmospheres for conditioning and testing

ISO 6741-1:1989, Textiles — Fibres and yarns — Determination of commercial mass of consignments —

Part 1: Mass determination and calculations
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
silk yarn

yarn made of nature silk fibres, including raw silk, tussah silk, dupion silk, thrown silk

3.2
thrown silk
silk that has been twisted or doubled and twisted
3.3
size
linear density (mass per unit length) of silk yarns

Note 1 to entry: Size expresses the degree of coarseness or fineness of silk yarns.

Note 2 to entry: Size is expressed in dtex. It may also be expressed in deniers (den), for which the conversion from

[1]
dtex, as given in ISO 1144 , is 1 den = 0,9 dtex.
3.4
nominal size
size indicated by the manufacturer
3.5
average size
average value of the tested size of the sizing skeins
© ISO 2018 – All rights reserved 1
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ISO 21046:2018(E)
3.6
conditioned size

size calculated by adding the commercial moisture regain weight to the oven-dry weight

Note 1 to entry: For silk, the commercial moisture regain is 11,0 %, which was developed in 1841, and then was

widely used by Japan, China, India, etc. See Reference [4].
3.7
size deviation

standard deviation of the value of the tested size of the silk samples indicating the deviation degree of

the sizing skeins from the average size of the whole lot
3.8
maximum size deviation

indication of the deviation degree of the finest sizing skeins or the coarsest sizing skeins from the

average size of the whole lot
3.9
coefficient of variation of size
size
percentage ratio between the size deviation and the average size
4 Principle

Under standard atmosphere, the sizing skeins are prepared by winding prescribed revolutions of silk

yarn on a reel with a
...

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