ISO INTERNATIONAL STANDARD 11556 Second edition 2005-06-15 Paper and board Determination of curl using a single vertically suspended test piece Papier et carton Détermination du tuilage au moyen d'une éprouvette uniquesuspendueverticalement Reference number ISO 11556:2005(E) O Copyright International Organization for Standardization @ISO2005 Not for Resale ISO11556:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below ?ISO2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO's member body in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland yemainagazainandardizato @ISO2005-All rights reserved ittedwithout licensefromIHS Not for Resale ISO 11556:2005(E) Contents Page Foreword IV Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Principle. 5 Apparatus 6 Sampling.. 7 Preparation of test pieces .. 8 Procedure. 8.1 General information. 8.2 Method. 8.2.1 Exposing the test pieces to the test environment. 8.2.2 Measurement of chord length and chord-to-arc distance.. 8.2.3 Identification of the side towards which the paper or board curls. 8.2.4 Measurement of the angle of axis of curl........ 9 Calculations. 9.1 Magnitude of curl.. 9.2 Angle of curl axis .. 9.3 Variation in side towards which paper or board curls... 10 Repeatability and reproducibility 10.1 Repeatability 10.2 Reproducibility 11 Test report 6 Annex A (informative) Illustrations of magnitude and types of curl.... Annex B (normative) Method of test piece support during curl measurement (illustrated for circular test pieces).... 9 Annex C (normative) Modified engineer's vernier calliper for determining chord length (C) and chord-to-arc distance (h)...... 10 Annex D (informative) Examples of alternative curl calculations Bibliography ... 12 Copyright International Organizaion for stadardizalon'ghts reserved ii nse from IHS Not for Resale ISO 11556:2005(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 beer non-governmental,inliaisonwithIsO,also take part in the work.Iso collaborates closely withthe International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 11556 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee SC 2, Test methods and quality specifications for paper and board. @Iso 2005 - All rights reserved ional OrganizationforStandardizatior ISO 11556:2005(E) Introduction The pr