ISO INTERNATIONAL STANDARD 18910 First edition 2000-05-15 Imaging materials Photographic film and paper Determination of curl Matériaux pour I'image - Films et papiers photographiques - Détermination de I'incurvation Reference number ISO 18910:2000(E) (So @ ISO 2000 ISO 18910:2000(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 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 ISO2000 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 734 10 79 E-mail [email protected] Web www.iso.ch Printed in Switzerland @ ISO 2000 - All rights reserved ISO 18910:2000(E) Contents Page Foreword.. 1 Scope 2 Terms and definitions 3 Sampling and conditioning. 4 Test method A... 5 Test method B.. 6 Test method C. 7 Test report. Annex A (informative) Numbering system for related International Standards. Bibliography.. ion?served ili ISO 18910:2000(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO committees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhas liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 3. Publication as an International Standard requires approval by at least 75 %. of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. This first edition cancels and replaces the third edition of isO 4330:1994, of which it constitutes a minor revision Annex A of this International Standard is for information only. @IsO 2000 - All rights reserved ISO 18910:2000(E) INTERNATIONAL STANDARD Imaging materials Photographic film and paper - Determination of curl Scope This International Standard specifies methods for determining and quantitatively expressing the curl characteristics ofunprocessedandprocessedphotographicfilmandpaperinsheet,rollorstripformats. It specifies three measuring methods: method A involves the determination of curl when the specimen is held in a vertical position, methods B and C with the specimen in a horizontal position. The values for the three methods are not comparable because of the differences in specimen configuration and size. These methods are not intended for use in determining the curl characteristics of photographic materials during processing or drying. 2 Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 2.1 curl departure from physical flatness and characterized with respect to curl direction (L, T, D or C), curl sign (+ or -) and curl value This flatness defect is evident by a tendency of film or paper to coil into a cylindrical shape. 2.2 curldirection means of identifying by letter L, T, D or C the direction of curl about a specific axis of a specimen corresponding to that of the sample from which it is taken See Figure 1. NOTE L or to the longer specimen dimension for sheets; an alternative approach when the machine direction is not known is to reference the curl direction to a film notch, if present