Textiles -- Man-made fibres -- Determination of shape factors in cross section

ISO 20754:2018 specifies methods for the determination of shape factors in the cross-section of man-made fibres.

Textiles -- Fibres fabriquées -- Détermination des facteurs de forme dans la section

General Information

Status
Published
Publication Date
04-Apr-2018
Current Stage
6060 - International Standard published
Start Date
02-Mar-2018
Completion Date
05-Apr-2018
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ISO 20754:2018 - Textiles -- Man-made fibres -- Determination of shape factors in cross section
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INTERNATIONAL ISO
STANDARD 20754
First edition
2018-04
Textiles — Man-made fibres —
Determination of shape factors in
cross section
Textiles — Fibres fabriquées — Détermination des facteurs de forme
dans la section
Reference number
ISO 20754:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO 20754:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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ii © ISO 2018 – All rights reserved
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ISO 20754:2018(E)
Contents  Page

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

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

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

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

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

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

6  Testing conditions and specimen ........................................................................................................................................................ 2

6.1 Testing conditions ................................................................................................................................................................................ 2

6.2 Sampling ....................................................................................................................................................................................................... 3

6.3 Preparation of the test specimen ............................................................................................................................................ 3

6.3.1 Microtome method .................. ......................................................................................................................... .............. 3

6.3.2 Plate method ....................................................................................................................................................................... 3

7  Testing procedure ............................................................................................................................................................................................... 3

7.1 Calibration of indicating value................................................................................................................................................... 3

7.2 Image capture of fibre cross-section .................................................................................................................................... 3

7.3 Number of tests ...................................................................................................................................................................................... 4

7.4 Shape factor in radius ....................................................................................................................................................................... 4

7.5 Shape factor in cross-section ...................................................................................................................................................... 4

7.6 Coefficient of perimeter .................................................................................................................................................................. 5

7.7 Degree of hollowness ........................................................................................................................................................................ 5

7.8 Coefficient of perimeters of hollowness ........................................................................................................................... 6

7.9 Specific factors ........................................................................................................................................................................................ 7

7.9.1 Length of contour line ................................................................................................................................................. 7

7.9.2 Arc radius ............................................................................................................................................................................... 7

7.9.3 Angle ........................................................................................................................................................................................... 7

7.9.4 Distance between two lines .................................................................................................................................... 8

8  Result ................................................................................................................................................................................................................................ 8

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

Annex A (normative) Number of additional tests ................................................................................................................................10

© ISO 2018 – All rights reserved iii
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ISO 20754:2018(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

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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

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

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

and yarns.
iv © ISO 2018 – All rights reserved
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INTERNATIONAL STANDARD ISO 20754:2018(E)
Textiles — Man-made fibres — Determination of shape
factors in cross section
1  Scope

This document specifies methods for the determination of shape factors in the cross-section of man-

made fibres.
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 2076, Textiles — Man-made fibres — Generic names
3  Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 2076 and the following 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
shape factor

radius difference between the minimum circumscribed circle and the concentric circle

internally tangent to the section

Note 1 to entry: It is expressed as a percentage of radius of the minimum circumscribed circle.

3.2
shape factor

area difference between the minimum circumscribed circle and the cross-section shape

Note 1 to entry: It is expressed as a percentage of area of the minimum circumscribed circle.

3.3
coefficient of perimeter

perimeter ratio between the cross-section shape and the circle shape in same area

3.4
degree of hollowness

area difference between the outer contour line of the cross-section and all hollow parts

Note 1 to entry: It is expressed as a percentage of area of outer contour line, used to express the shape factor of

hollow fibres.
© ISO 2018 – All rights reserved 1
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ISO 20754:2018(E)
3.5
coefficient of perimeter of hollowness
perimeter ratio between all the hollow parts and the outer contour line
Note 1 to entry: It is used to express the shape factor of hollow fibres.
4  Principle

This method provides techniques for the assessment of the cross-sectional shape of man-made fibres,

based on contour lines, measured radii and perimeters, calculated area and other geometric quantities.

Furthermore, the method provides techniques for the calculation of specified shape factors in the cross-

sectional shape.
5  Apparatus
The usual laboratory apparatus and, in particular, the following.
5.1  Measuring microscope apparatus, which meets the following requirements:
a) stage mechanism
...

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