EN ISO 21765:2021

Textiles - Determination of fabric deformability by forced mechanical distension (ISO 21765:2020)

This document specifies a method for the automatic determination of the deformability of textile fabrics, including continuous-fibre reinforcement textiles. This method is not applicable to resin impregnated fabrics.
The method is suitable for use with fabrics such as woven or knitted fabrics, nonwovens, non-crimp fabrics, fabrics made of glass rovings or untwisted carbon filament yarns intended for reinforced composite materials. When applying the method to multi-axial non-crimp fabrics, the evaluation of the fibre orientation and gaps only incorporates the uppermost layer.
The method can be used for fabrics treated with powder binder.

Textilien - Bestimmung der Verformbarkeit von Flächengebilden durch erzwungene Umformung (ISO 21765:2020)

Dieses Dokument legt ein Verfahren zur automatischen Bestimmung der Verformbarkeit von textilen Flächengebilden, einschließlich Verstärkungstextilien für endlosfaserverstärkte Textilien, fest. Dieses Verfahren ist nicht für harzimprägnierte Flächengebilde anzuwenden.
Das Verfahren ist geeignet für Flächengebilde wie Webstoffe oder Maschenware, Vliesstoffe, Gelege, Flächengebilde aus Glasrovings oder ungedrehten Kohlenstoff Filamentgarnen, die für verstärkte Werkstoff-Verbunde vorgesehen sind. Bei Anwendung des Verfahrens auf multiaxiale Gelege schließt die Auswertung der Faserorientierung und der Gaps nur die oberste Lage ein.
Das Verfahren kann für mit Pulverbinder behandelte Flächengebilde angewendet werden.

Textiles - Détermination de la déformabilité des étoffes par distension forcée mécaniquement (ISO 21765:2020)

Le présent document spécifie une méthode pour la détermination automatique de la déformabilité des étoffes textiles, y compris celle des textiles de renfort par fibres continues. Cette méthode n'est pas applicable aux étoffes imprégnées de résine.
La méthode est applicable aux étoffes telles que les étoffes tissées ou tricotées, les nontissés, les étoffes à base de fils sans embuvage, les étoffes constituées de mèches de verre ou les fils de filaments en carbone détordus destinés à des matériaux composites renforcés. Lors de l'application de la méthode à des étoffes à base de fils sans embuvage multiaxiales, l'évaluation de l'orientation des fibres et des espaces porte seulement sur la couche supérieure.
La méthode peut être utilisée pour des étoffes traitées avec un liant en poudre.

Tekstilije - Ugotavljanje deformabilnosti tkanine s prisilnim mehanskim raztezanjem (ISO 21765:2020)

General Information

• Status: Published
• Publication Date: 12-Jan-2021
• Withdrawal Date: 30-Jul-2021
• ICS: 59.080.30 - Textile fabrics
• Technical Committee: CEN/TC 248 - Textiles and textile products
• Drafting Committee: CEN/TC 248 - Textiles and textile products
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 13-Jan-2021
• Completion Date: 13-Jan-2021
• Ref Project: SIST EN ISO 21765:2021 - Textiles - Determination of fabric deformability by forced mechanical distension (ISO 21765:2020)

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2021
Tekstilije - Ugotavljanje deformabilnosti tkanine s prisilnim mehanskim
raztezanjem (ISO 21765:2020)
Textiles - Determination of fabric deformability by forced mechanical distension (ISO
21765:2020)
Textilien - Automatische Bestimmung der Deformierbarkeit an Webstoffen und Gelegen
(ISO 21765:2020)
Textiles - Détermination de la déformabilité des étoffes par distension forcée
mécaniquement (ISO 21765:2020)
Ta slovenski standard je istoveten z: EN ISO 21765:2021
ICS:
59.060.01 Tekstilna vlakna na splošno Textile fibres in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 21765
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2021
EUROPÄISCHE NORM
ICS 59.080.30
English Version
Textiles - Determination of fabric deformability by forced
mechanical distension (ISO 21765:2020)
Textiles - Détermination de la déformabilité des étoffes Textilien - Automatische Bestimmung der
par distension forcée mécaniquement (ISO Deformierbarkeit an Webstoffen und Gelegen (ISO
21765:2020) 21765:2020)
This European Standard was approved by CEN on 7 December 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21765:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 21765:2021) has been prepared by Technical Committee ISO/TC 38 "Textiles"
in collaboration with Technical Committee CEN/TC 248 “Textiles and textile products” the secretariat of
which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by July 2021, and conflicting national standards shall be
withdrawn at the latest by July 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 21765:2020 has been approved by CEN as EN ISO 21765:2021 without any modification.

INTERNATIONAL ISO
STANDARD 21765
First edition
2020-12
Textiles — Determination of fabric
deformability by forced mechanical
distension
Textiles — Détermination de la déformabilité des étoffes par
distension forcée mécaniquement
Reference number
ISO 21765:2020(E)
©
ISO 2020
ISO 21765:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 21765:2020(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Apparatus . 3
6 Test specimen . 5
7 Procedure. 6
7.1 Inserting the test specimen . 6
7.2 Specifications of the test . 6
7.2.1 Test parameters . 6
7.2.2 Evaluation parameters. 6
7.3 Test procedure . 7
8 Calculation and specification of the results . 7
8.1 Non-crimp fabric . 7
8.1.1 General. 7
8.1.2 Deformation force . 8
8.1.3 Gap width . 8
8.1.4 Gap portion . 8
8.1.5 Gap shape . 8
8.1.6 Fibre-angle change . 8
8.1.7 Undulation . 8
8.1.8 Loop formation . 8
8.1.9 Waviness . 9
8.1.10 Out-of-roundness . 9
8.2 Woven fabrics . 9
8.2.1 Characteristic value names, symbols and units . 9
8.2.2 Deformation force . 9
8.2.3 Gap portion . 9
8.2.4 Gap area .10
8.2.5 Gap shape .10
8.2.6 Fibre-angle change .10
8.2.7 Undulation .10
8.2.8 Shearing angle .10
8.2.9 Waviness .10
8.2.10 Out-of-roundness .10
8.2.11 Residual deformation .10
8.3 Knitted fabrics .11
8.3.1 Table with characteristic value names, symbols and units .11
8.3.2 Deformation force .11
8.3.3 Gap portion .11
8.3.4 Gap area .11
8.3.5 Gap shape .11
8.3.6 Waviness .11
8.3.7 Out-of-roundness .11
8.3.8 Residual deformation .12
...