ISO INTERNATIONAL STANDARD 4592 Second edition 1992-12-01 Plastics - Film and sheeting Determination of length and width Plastiques Film et feuille - Determination de la longueur et de la largeur Referencenumber ISO4592:1992(E) ISO 4592:1992(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 4592 was prepared by Technical Committee ISO/TC 61, Plastics, Sub-Committee SC 11, Products. This second editioncancelsand replaces the first edition (Is0 4592:1979), which has been technically revised. 1SO1992 All rights reserved. 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 per mission in writing from the publisher International Organization for Standardization Case Postale 56 . CH-1211 Geneve 20 : Switzerland Printed in Switzerland ii INTERNATIONAL STANDARD ISO4592:1992(E) Plastics Film and sheeting Determination of length and width 1 Scope Reference method for determination of the length of a roll 1.1 This International Standard specifies a method 2.1 Apparatus for the determination of the "free" length of a roll of plastics film or sheeting (see clause 2). 2.1.1 Sharp knife or razor. This method is intended for use with rolls of length 2.1.2 Metallic scale or profile, longer than the up to 100 m as a reference method with which other width of the roll to be measured. methodsmaybechecked.Anyothermethodofde- termining the length may be used, provided that it gives the same resuit as the specified method. If au- 2.1.3 Flat surface, preferably at least 10 m long and tomatic measuring devices are used, it is necessary at least as wide as the roll to be measured.The sur- that they be checked by measurements made in ac- face shall be marked off in 1 m lengths along each cordance with the specified procedure for each type longitudinal edge, with at least one of these lengths of film or sheeting. at one end of the surface being subdivided into O,1 m divisions. Because the method is laborious it is permissible, in the case of long rolls, to check the other methods of 2.2 Procedure measurement referred to above on an approximately 100 m length of film and sheeting measured by the specified method. 2.2.1 Unroll the film or sheeting into lap form in such 5 m, and that there are no more than twenty laps di- rectly one above the other. Allow the material to re- 1.2 This International Standard also specifies a main in this lap form for at least 1 h before the method for the determination of the average width determination of length is carried out. of a roll and the width of a sample of plastics film or sheeting not less than 5 mm wide (see clause 3). If 2.2.2 Take the uppermost cut end of the pile of the width is only slightly greater than 5 mm, the ac- material and pull it along the flat surface (2.1.3), taking curacy of the method is only 2 %. Two procedures are care to ensure that only the minimum of stretch is specified, their application depending on the width of applied to the material. the material. NOTE1 Onemethod of achievingthisistopassthefilm The method determines the "free" width of a roll of or sheeting over a roller mounted so as to rotate freely on film or sheeting.