ISO INTERNATIONAL STANDARD 12194 First edition 1995-09-15 ANSl Internat Doc Sec Leaf tobacco Determination of strip particle size Tabac enfeuilles-Détermination de la tailledesparticules de strips ISO Reference number ISO12194:1995(E) No reproduction or networking permited without license from IHS Not for Resale ISO 12194:1995(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 represented on that committee. International organizations, governmental and non-governmental, in liaison with IsO, aiso take part in the work. IsO. collaborates closely with the International Electrotechnical Commission. (lEC) on all matters of electrotechnical standardization. circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting avote. International Standard ISO 12194 was prepared by Technical Committee ISO/TC 126, Tobacco and tobacco products, Subcommittee SC 2, Leaf tobacco. Annexes A to C of this International Standard are for information only @ISO1995 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 mechanicai, including photocopying and microfilm,without permission in writing from the publisher. International Organization for Standardization Case postale 56: CH-1211Geneve 20:Switzerland Printed inSwitzerland ii ISO 12194:1995(E) INTERNATIONAL STANDARD ISO Leaf tobacco --- Determination of strip particle size 1 Scope 3.2 strips: Long pieces of threshed or stripped lamina. This International Standard specifies a method for the measurement of the particle size of strips of leaf 3.3 threshing: Removal of the stem and side veins tobacco. of tobacco leaves by mechanical means. It is :applicable to strips arising from the operation of 3.4 stripping: Removal of the stem from tobacco threshing or hand-stripping leaf tobacco, which can be leaves, leaving the halves of the leaf more or less from any tobacco type including flue-cured, burley and intact. cigartobacco. 3.5 quality-control shaker: Apparatus that separ- The test method consists of taking a sample of strips ates the strips into five particle sizes by passing them and passing it over a four-tray quality-control shaker. over four screens. .4 Apparatus 2 Normative reference The following standard contains provisions which, 4.1 Quality-control shaker through reference in this text, constitute provisions of this international Standard. At the time of publication The gquality-control shaker consists of a feedband the edition indicated . was valid. All standards are conveyor, four sieving trays, and a fines-collection bin subject to revision, and parties to agreements based all of which are mounted on a robust frame. on this International Standard are encouraged to Separation is carried out by vibrating the four trays. investigate the possibility of applying the most recent each of which is fitted with a different mesh screen. edition of the standard indicated below. Members of These are arranged above each other in such a way IEC and ISO maintain registers of currently valid that particles falling through one screen are exposed Iinternational Standards. to at least 660 mm of the next screen. Any strips passing over a screen are automatically collected in IS0 3310-1:1990, Test sieves Technical require- separate bins at the end of each shaker screen. A ments and testing --- Part 1: Test sieves of metal wire diagram of the general design of the quality-control cloth. shaker is shown in figure 1. 4.2 Sieving screens 3 Definitions 4.2.1 The four screens fitted to the quality-control For the purposes of this International Standard, the shaker should be of wire mesh, con