ISO INTERNATIONAL STANDARD 12195 First edition 1995-09-15 ANSI Internat Doc Sec Threshed tobacco -- Determination of residual stem content Tabac battu --- Determination de la teneur en cotes residuelles ISO Reference number ISO 12195:1995(E) No reproduction or networking permited without license from IHS Not for Resale ISO 12195:1995(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. Internationat 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 avote. International Standard ISO 12195 was prepared by Technical Committee ISO/TC 126, Tobacco and tobacco products, Subcommittee SC 2. Leaf tobacco. D are for information only. 1SO1995 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 mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organizationfor Standardization Casepostale56CH-1211Geneve20·Switzerland Printed in Switzerland Standardizatior Not for Resale INTERNATIONAL STANDARD ISO ISO 12195:1995(E) Threshed tobacco -- Determination of residual stem content 1 Scope 2.7 stacked sieve-type shaker: Shaker which reproduces the circular and tapping motion given to This International Standard specifies a method for the test screens in sieving in a uniform manner. measurement of the stem content of strips of leaf tobacco. 3 Apparatus It is applicable to strips arising from the operation of threshing or hand-stripping leaf tobacco, which can be from any tobacco type including flue-cured, burley and 3.1 Stem tester cigartobacco. The main operating features of the stem tester are The test method consists of taking of a sample of given in 3.1.1 to 3.1.11, and are llustrated in figure 1. tobacco strips and passing it through a stem tester. 3.1.1 Static pressure tapping apparatus and manometer 2 Definitions The tapping apparatus shall be fitted 254 mm above the flange, immediately above the doors of the For the purposes of this International Standard, the separating tower and as flush as possible to the following definitions apply. internal wall. This is to avoid air turbulence and thus erratic readings. The static tapping apparatus is 2.1 stem: Main vein of a tobacco leaf. illustrated in figure 2. 2.2 lamina: Area between the veins of a tobacco A suitable manometer with a full-scale range of at leaf. least 0 mmH20 to 5 mmH20 is fitted to the tapping apparatus and set to zero. It indicates the air velocity 2.3 strips: Long pieces of threshed or stripped in the separating tower. lamina. 2.4 threshing: Removal of the stem and side veins 3.1.2 Stem-deflector plates of tobacco leaves by mechanical means. Two stem-deflector plates are required to stop free stem and "heavies" being kicked out of the thresher 2.5 stripping: Removal of the stem from tobacco and lost to the test. The first is fitted to the end of the leaves, leaving the halves of the leaf more or less vibratory conveyor feeding into the top of the thresher intact. housing: the second is fitted to the base of the thresher (see figures 3 and 4). 2.6 stem tester: Small-scale thresher and separating tower which threshes and classifies the residual stem Damper C sited at the air-flow inlet below the from the lamina in a controlled manner. thresher shall be removed (see 3.1.8). 1 Not for Resale