ISO INTERNATIONAL STANDARD 9073-7 First edition 1995-12-15 Textiles Test methods for nonwovens Part 7: Determination of bending length Textiles - Méthodes d'essai pour nontissés - Partie 7: Détermination de la longueur de flexion AX ISO Reference number ISO9073-7:1995(E) No reproduction or networking permitted without se from IHS Not for Resale ISO9073-7:1995(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. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International a vote. International Standard ISO 9073-7 was prepared by Technical Committee ISO/TC 38,Textiles. ISO 9073 consists of the following parts, under the general title Textiles - Test methods for nonwovens: -- Part 1: Determination of mass per unit area -Part 2: Determination of thickness Part 3: Determination of tensile strength and elongation - Part 4: Determination of tear resistance - Part 7: Determination of bending length Part 8: Determination of liquid strike-through time (simulated urine) -Part 9: Determination of drape coefficient Annex A of this part of IS0 9073 is for information only. ISO 1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organizationfor Standardization CasePostale56·CH-1211Geneve20·Switzerland Printed in Switzerland Not for Resale INTERNATIONALSTANDARD ISO ISO9073-7:1995(E) Textiles - Test methods for nonwovens Part 7: Determination of bending length 1 Scope Iso 9073-1:1989, Textiles - Test methods for non- wovens - Part 1: Determination of mass per unit This part of ISO 9073 specifies a method for deter- area. mining the bending length of a nonwoven fabric. An equation is given for calculating the flexural rigidity of 3Definitions the fabric from the bending length. For the purposes of this part of ISO 9073, the follow- The method is not applicable to combination-type ing definitions apply. materials (composites or laminates) in which there canbeanatural twist. 3.1 bending length: Length of a rectangular strip of fabric, fixed at one end and free at the other, that NOTE1 This International Standard describes a test will bend under its own weight to an angle of 7,1°. method specific to nonwovens. Other International Stan- dards applicable to textile, paper, plastics, rubber or other 3.2 flexural rigidity: Ratio of small changes in materials can also be applied to test certain nonwoven bending moment per unit width of the material to characteristics. corresponding small changes in curvature. NOTE 2 Flexural rigidity can be calculated from the bending length. 2 Normative references 4 Principle The following standards contain provisions which, through reference in this text, constitute provisions A rectangular strip of fabric is supported on a hori- of this part of ISO 9073. At the time of publication, the zontal platform with the long axis of the strip parallel editions indicated were valid. All standards are subject to the iong axis of the platform. The strip is advanced to revision, and parties to agreements based on this in the direction of its length so that an increasing part part of IsO 9073 are encouraged to investigate the overhangs the platform and b