1、BSI Standards Publication BS ISO 6565:2015 Tobacco and tobacco products Draw resistance of cigarettes and pressure drop of filter rods Standard conditions and measurementBS ISO 6565:2015 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 6565:2015. It supersedes
2、 BS ISO 6565:2011 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee AW/40, Tobacco and tobacco products. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all
3、the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 85257 2 ICS 65.160 Compliance with a British Standard cannot confer immunity from legal obligations. This British
4、Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2015. Amendments/corrigenda issued since publication Date T e x t a f f e c t e dBS ISO 6565:2015 ISO 2015 Tobacco and tobacco products Draw resistance of cigarettes and pressure drop of filter r
5、ods Standard conditions and measurement Tabac et produits du tabac Rsistance au tirage des cigarettes et perte de charge des btonnets-filtres Conditions normalises et mesurage INTERNATIONAL STANDARD ISO 6565 Fifth edition 2015-12-15 Reference number ISO 6565:2015(E)BS ISO 6565:2015ISO 6565:2015(E)ii
6、 ISO 2015 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
7、 on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41
8、22 749 09 47 copyrightiso.org www.iso.orgBS ISO 6565:2015ISO 6565:2015(E)Foreword iv Introduction v 1 Scope . 1 2 Normative references 1 3 Terms and definitions . 1 4 Test conditions . 2 4.1 Test conditions common to cigarettes and filter rods . 2 4.1.1 General 2 4.1.2 Air flow . 2 4.1.3 Position 3
9、4.2 Conditions particular to cigarettes Insertion of the test piece . 3 4.3 Conditions particular to filter rods Encapsulation . 3 5 Instrument calibration . 3 6 Procedure. 3 6.1 Conditions common to vacuum and pressure instruments . 3 6.2 Conditions particular to vacuum instruments 3 6.3 Conditions
10、 particular to pressure instruments (for filter rods only) 4 7 Expression of results 4 8 Precision . 4 8.1 Interlaboratory test. 4 8.2 Repeatability . 4 8.3 Reproducibility . 5 9 Test report . 5 Annex A (normative) Calibration of pressure drop transfer standards 6 Annex B (informative) Results of an
11、 interlaboratory trial .14 Annex C (informative) Comparison of draw resistance or pressure drop measurement: Critical flow orifice instruments versus constant mass flow instruments .18 Bibliography .20 ISO 2015 All rights reserved iii Contents PageBS ISO 6565:2015ISO 6565:2015(E) Foreword ISO (the I
12、nternational 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
13、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 electrotechnica
14、l standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in
15、accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. D
16、etails of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute a
17、n endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committe
18、e responsible for this document is ISO/TC 126, Tobacco and tobacco products, Subcommittee SC 1, Physical and dimensional tests. This fifth edition cancels and replaces the fourth edition (ISO 6565:2011), which has been technically revised.iv ISO 2015 All rights reservedBS ISO 6565:2015ISO 6565:2015(
19、E) Introduction The draw resistance of cigarettes or the pressure drop of filter rods is a widespread and important concept both for product quality specifications and for analytical determinations by mechanical smoking. Different procedures and apparatus are currently available for this determinati
20、on. It has so far not been possible to standardize the complete description of the equipment to be used and the detailed procedure. Nevertheless, it has been possible to obtain broad consensus on the definitions to be adopted and the conditions that allow comparable determinations of this characteri
21、stic to be made. In order to achieve this, one of the main requirements is the use of transfer standards for the calibration of instruments (see Annex A). In this International Standard, the results are given in pascals (Pa). For information, they are also given in millimetres water gauge (mmWG). Th
22、e values given previously in mmWG are converted into Pa using the following correction factor: 1 mmWG = 9,806 7 Pa For practical use, the values have been rounded. ISO 2015 All rights reserved vBS ISO 6565:2015BS ISO 6565:2015Tobacco and tobacco products Draw resistance of cigarettes and pressure dr
23、op of filter rods Standard conditions and measurement 1 Scope This International Standard describes a method for the measurement of the draw resistance of cigarettes and pressure drop of filter rods, and specifies the standard conditions applicable to such measurements. It is applicable to cigarette
24、s, filter rods, and, by extension, to cylindrical tobacco products similar to cigarettes. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies.
25、For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3402, Tobacco and tobacco products Atmosphere for conditioning and testing 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 pressure
26、drop p static pressure difference between the two ends of a test piece completely encapsulated in a measuring device such that no air can pass through the outer membrane (or wrapping), a pneumatic circuit, or a pressure drop transfer standard (3.6) when it is traversed by an air flow under steady co
27、nditions in which the measured volumetric flow, under standard conditions, at the output end (3.4) is 17,5 ml/s, as defined in ISO 3402 Note 1 to entry: This is expressed in pascals (Pa) (or in mmWG). 3.2 draw resistance p D negative pressure which has to be applied to the output end (3.4), under te
28、st conditions (see ISO 3402), in order to sustain a volumetric flow of 17,5 ml/s, exiting at the output end, when the cigarette is encapsulated in a measurement device to a depth of approximately 9 mm, as defined in ISO 3308 Note 1 to entry: Any ventilation zones and the tobacco rod are exposed to t
29、he atmosphere. Note 2 to entry: The concept of draw resistance can also be subjectively judged when a cigarette is smoked by a consumer/taste panel. Under such circumstances, draw resistance is not measured objectively because the conditions of the formal definition are not met. INTERNATIONAL ST AND
30、ARD ISO 6565:2015(E) ISO 2015 All rights reserved 1BS ISO 6565:2015ISO 6565:2015(E) 3.3 input endend of the test piece intended to be lit 3.4 output end end opposite from the input end (3.3) 3.5 standard direction of flow direction from the input end (3.3) to the output end (3.4) Note 1 to entry: In
31、 the case of a filter rod, the input end (3.3) and the output end (3.4) are defined by the direction of flow. 3.6 pressure drop transfer standard transfer standard for pressure drop (3.1) measurement systems which is calibrated under standard ambient conditions and used under local ambient condition
32、s Note 1 to entry: The form and properties of suitable transfer standards are given in Annex A. 3.7 dummy standard device with the same shape and similar form to a pressure drop transfer standard (3.6), for use in leak testing of calibration apparatus Note 1 to entry: A suitable dummy standard consi
33、sts of a pressure drop transfer standard or a smooth metal tube of similar dimensions. 3.8 reference standard pressure drop transfer standard (3.6) against which other pressure drop transfer standards are compared Note 1 to entry: Such a reference standard is generally reserved for this purpose and
34、is not used for the routine calibration of pressure drop measuring instruments. 3.9 monitor reference standard reference standard (3.8) used to confirm the correctness of calibration of an instrument or measurement system Note 1 to entry: See A.4.2.3.4. 4 Test conditions 4.1 Test conditions common t
35、o cigarettes and filter rods 4.1.1 General The test conditions shall be constant and in agreement with the conditions under which the calibration was performed (see Clause 5). NOTE The use of transfer standards for calibration enables measurements to be made under test conditions outside those descr
36、ibed by ISO 3402. 4.1.2 Air flow The air flow shall be from the input end in the standard direction of flow (see 3.5).2 ISO 2015 All rights reservedBS ISO 6565:2015ISO 6565:2015(E) 4.1.3 Position The position of the test piece may be either horizontal or vertical, but products with cavities containi
37、ng loose-fill material shall be positioned vertically. 4.2 Conditions particular to cigarettes Insertion of the test piece The output end of the test piece shall be inserted into a measurement device encapsulated to a depth of approximately 9 mm. NOTE The intention is to achieve a good seal while no
38、t occluding any ventilation holes. 4.3 Conditions particular to filter rods Encapsulation The test piece shall be completely encapsulated in a measuring device so that no air can pass through the filter rod wrapping. 5 Instrument calibration The instrument shall be calibrated before normal testing u
39、sing transfer standards. This shall be done at least once per day. The calibration shall be carried out in accordance with the instrument manufacturers instructions. The instrument shall be recalibrated if the atmospheric conditions change by more than 2 C for temperature, or by more than 5 % for re
40、lative humidity. Each calibration of the instrument shall be recorded for later reference. NOTE 1 To obtain the best accuracy, calibrate the instrument as close as possible to its full-scale deflection or at the maximum point of the range of values of the products to be tested. To check for air leak
41、s that might have occurred during the calibration and to check the linearity of the measuring system, at least one intermediate value pressure drop standard should be used in order to obtain a mid-scale value. NOTE 2 In addition to the mid-scale value, a calibration check can be made with a pressure
42、 drop standard that has a nominal pressure drop value close to the draw resistance or pressure drop of the test pieces to be measured. 6 Procedure 6.1 Conditions common to vacuum and pressure instruments Record details of the instrument type and configuration, including measurement settling time, if
43、 this can be determined (see 6.2 and 6.3). Insert the test piece (either manually or automatically) into the measuring device of the instrument. Read the value of the draw resistance or pressure drop and record it. 6.2 Conditions particular to vacuum instruments Before reading the draw resistance or
44、 pressure drop, leave the test piece in the measuring device until the reading is steady. NOTE Practice has shown that a settling time of 4 s to 6 s is normally sufficient. ISO 2015 All rights reserved 3BS ISO 6565:2015ISO 6565:2015(E) 6.3 Conditions particular to pressure instruments (for filter ro
45、ds only) Determine the required settling time depending on the draw resistance of the test piece and the type of instrument. The reading for pressure drop shall be recorded at a constant time after the insertion of the test piece. For the particular conditions described in 6.2 and 6.3, practice has
46、shown that for low draw resistance or pressure drop, i.e. below 2 000 Pa (or about 200 mmWG), a settling time of 2 s to 3 s is sufficient, while for higher draw resistances or pressure drop, i.e. above 4 000 Pa (or about 400 mmWG), a settling time of 4 s to 6 s is required. 7 Expression of results T
47、he expression of the laboratory results depends on the purpose for which the data are required and the level of laboratory precision. Express the results as follows: individual draw resistance or pressure drop of a test piece, rounded to the nearest 10 Pa (or to the nearest 1 mmWG); average and stan
48、dard deviation of the draw resistance or pressure drop of a sample, rounded to the nearest 1 Pa (or to the nearest 0,1 mmWG). 8 Precision 8.1 Interlaboratory test Details of an interlaboratory test on the precision of the method are summarized in Annex B. The values derived from this interlaboratory
49、 test might not be applicable to values and matrices other than those given. 8.2 Repeatability The absolute difference between two independent single results, obtained using the same method on identical test material in the same laboratory by the same operator using the same equipment within a short interval of time will, in not more than 5 % of cases, be greater than the values given in Table 1 for cigarettes and Table 2 for filter rods. Table 1 Cigarettes Repeatability limit, r Pa mmWG r = 23 r = 2,3 Table 2
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