ISO INTERNATIONAL STANDARD 11897 First edition 1999-03-01 Packaging Sacks made from thermoplastic flexible film Tear propagation on edge folds Emballages - Sacs faits d'un film thermoplastique flexible - Propagation de la déchirure sur les plis de bordure ISO Reference number ISO 11897:1999(E) ISO 11897:1999(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 liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission(iEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. International Standard ISO 11897 was prepared by Technical Committee ISO/TC 122, Packaging, Subcommittee SC 2, Sacks Annex A is for information only. ISO1999 C All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic International OrganizationforStandardization Casepostale56·CH-1211Geneve20·Switzerland Internet [email protected] Printed in Switzerland ii INTERNATIONAL STANDARD@ISO ISO 11897:1999(E) Packaging Sacks made from thermoplastic flexible film Tear propagation on edge folds 1 Scope This International Standard specifies a method for the determination, under given conditions, of the resistance to unfolded film permit the determination of the residual resistance in the fold. 2 Normative references this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do notapply.However,parties to agreements based onthisInternational Standardare encouragedto investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. IsO 527-3:1995, Plastics — Determination of tensile properties Part 3: Test conditions for films and sheets. Iso 2233:1994, Packaging - Complete filled transport packages Conditioning for testing. IsO 4593:1993, PlasticsFilms and sheeting—Determination of thickness by mechanical scanning 3 Terms and definitions For the purposes of this International Standard, the following terms and definitions apply 3.1 resistance to tear propagation Figure 1 3.2 residual resistance percentage calculated by the equation Ffold / Ffilm × 100 % where 1