1、BSI Standards PublicationBS ISO 6565:2015Tobacco and tobacco products Draw resistance of cigarettesand pressure drop of filter rods Standard conditions andmeasurementBS ISO 6565:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 6565:2015.It supersedes BS ISO
2、 6565:2011 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee AW/40, Tobacco and tobacco products.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessar
3、yprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 85257 2ICS 65.160Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was publish
4、ed under the authority of theStandards Policy and Strategy Committee on 31 December 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 6565:2015 ISO 2015Tobacco and tobacco products Draw resistance of cigarettes and pressure drop of filter rods Standard conditions
5、and measurementTabac et produits du tabac Rsistance au tirage des cigarettes et perte de charge des btonnets-filtres Conditions normalises et mesurageINTERNATIONAL STANDARDISO6565Fifth edition2015-12-15Reference numberISO 6565:2015(E)BS ISO 6565:2015ISO 6565:2015(E)ii ISO 2015 All rights reservedCOP
6、YRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll 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 on the internet or an intranet, w
7、ithout 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 officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.org
8、BS ISO 6565:2015ISO 6565:2015(E)Foreword ivIntroduction v1 Scope .12 Normative references 13 Terms and definitions .14 Test conditions .24.1 Test conditions common to cigarettes and filter rods . 24.1.1 General 24.1.2 Air flow . 24.1.3 Position 34.2 Conditions particular to cigarettes Insertion of t
9、he test piece . 34.3 Conditions particular to filter rods Encapsulation . 35 Instrument calibration . 36 Procedure. 36.1 Conditions common to vacuum and pressure instruments . 36.2 Conditions particular to vacuum instruments 36.3 Conditions particular to pressure instruments (for filter rods only) 4
10、7 Expression of results 48 Precision . 48.1 Interlaboratory test. 48.2 Repeatability . 48.3 Reproducibility . 59 Test report . 5Annex A (normative) Calibration of pressure drop transfer standards 6Annex B (informative) Results of an interlaboratory trial .14Annex C (informative) Comparison of draw r
11、esistance or pressure drop measurement: Critical flow orifice instruments versus constant mass flow instruments .18Bibliography .20 ISO 2015 All rights reserved iiiContents PageBS ISO 6565:2015ISO 6565:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation
12、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. I
13、nternational 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.The procedures used to develop this document and those
14、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 accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see
15、 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. Details of any patent rights identified during the development of the docume
16、nt 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 an endorsement.For an explanation on the meaning of ISO specific terms and ex
17、pressions 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 informationThe committee responsible for this document is ISO/TC 126, Tobacco and tobacco products, S
18、ubcommittee 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(E)IntroductionThe draw resistance of cigarettes or the pressure drop of filter
19、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 determination. It has so far not been possible to standardize the complete description of the
20、 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 characteristic to be made. In order to achieve this, one of the main requirements is the use
21、 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).The values given previously in mmWG are converted into Pa using the following correcti
22、on factor: 1 mmWG = 9,806 7 PaFor 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 drop of filter rods Standard conditions and measurement1 ScopeThis International Standa
23、rd 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 cigarettes, filter rods, and, by extension, to cylindrical tobacco products similar to cigarettes
24、.2 Normative referencesThe 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. For undated references, the latest edition of the referenced document (including any amend
25、ments) applies.ISO 3402, Tobacco and tobacco products Atmosphere for conditioning and testing3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1pressure droppstatic pressure difference between the two ends of a test piece completely encapsulated in
26、 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 conditions in which the measured volumetric flow, under standard conditions, at the output end (3.4)
27、 is 17,5 ml/s, as defined in ISO 3402Note 1 to entry: This is expressed in pascals (Pa) (or in mmWG).3.2draw resistancepDnegative pressure which has to be applied to the output end (3.4), under test conditions (see ISO 3402), in order to sustain a volumetric flow of 17,5 ml/s, exiting at the output
28、end, when the cigarette is encapsulated in a measurement device to a depth of approximately 9 mm, as defined in ISO 3308Note 1 to entry: Any ventilation zones and the tobacco rod are exposed to the atmosphere.Note 2 to entry: The concept of draw resistance can also be subjectively judged when a ciga
29、rette 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 STANDARD ISO 6565:2015(E) ISO 2015 All rights reserved 1BS ISO 6565:2015ISO 6565:2015(E)3.3input endend of the te
30、st piece intended to be lit3.4output endend opposite from the input end (3.3)3.5standard direction of flowdirection from the input end (3.3) to the output end (3.4)Note 1 to entry: In the case of a filter rod, the input end (3.3) and the output end (3.4) are defined by the direction of flow.3.6press
31、ure drop transfer standardtransfer standard for pressure drop (3.1) measurement systems which is calibrated under standard ambient conditions and used under local ambient conditionsNote 1 to entry: The form and properties of suitable transfer standards are given in Annex A.3.7dummy standarddevice wi
32、th the same shape and similar form to a pressure drop transfer standard (3.6), for use in leak testing of calibration apparatusNote 1 to entry: A suitable dummy standard consists of a pressure drop transfer standard or a smooth metal tube of similar dimensions.3.8reference standardpressure drop tran
33、sfer standard (3.6) against which other pressure drop transfer standards are comparedNote 1 to entry: Such a reference standard is generally reserved for this purpose and is not used for the routine calibration of pressure drop measuring instruments.3.9monitor reference standardreference standard (3
34、.8) used to confirm the correctness of calibration of an instrument or measurement systemNote 1 to entry: See A.4.2.3.4.4 Test conditions4.1 Test conditions common to cigarettes and filter rods4.1.1 GeneralThe test conditions shall be constant and in agreement with the conditions under which the cal
35、ibration was performed (see Clause 5).NOTE The use of transfer standards for calibration enables measurements to be made under test conditions outside those described by ISO 3402.4.1.2 Air flowThe air flow shall be from the input end in the standard direction of flow (see 3.5).2 ISO 2015 All rights
36、reservedBS ISO 6565:2015ISO 6565:2015(E)4.1.3 PositionThe position of the test piece may be either horizontal or vertical, but products with cavities containing loose-fill material shall be positioned vertically.4.2 Conditions particular to cigarettes Insertion of the test pieceThe output end of the
37、 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 not occluding any ventilation holes.4.3 Conditions particular to filter rods EncapsulationThe test piece shall be completely encapsulated in a meas
38、uring device so that no air can pass through the filter rod wrapping.5 Instrument calibrationThe instrument shall be calibrated before normal testing using transfer standards. This shall be done at least once per day. The calibration shall be carried out in accordance with the instrument manufacture
39、rs instructions.The instrument shall be recalibrated if the atmospheric conditions change by more than 2 C for temperature, or by more than 5 % for relative humidity.Each calibration of the instrument shall be recorded for later reference.NOTE 1 To obtain the best accuracy, calibrate the instrument
40、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 leaks that might have occurred during the calibration and to check the linearity of the measuring system, at least one intermediate value pressure drop stand
41、ard 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 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 Procedure6.1 Condi
42、tions common to vacuum and pressure instrumentsRecord details of the instrument type and configuration, including measurement settling time, if 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 valu
43、e of the draw resistance or pressure drop and record it.6.2 Conditions particular to vacuum instrumentsBefore reading the draw resistance or 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
44、sufficient. ISO 2015 All rights reserved 3BS ISO 6565:2015ISO 6565:2015(E)6.3 Conditions particular to pressure instruments (for filter rods 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
45、 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 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 res
46、istances 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 resultsThe 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: i
47、ndividual draw resistance or pressure drop of a test piece, rounded to the nearest 10 Pa (or to the nearest 1 mmWG); average and standard 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 Precision8.1 Interlaboratory testDetails
48、 of an interlaboratory test on the precision of the method are summarized in Annex B. The values derived from this interlaboratory test might not be applicable to values and matrices other than those given.8.2 RepeatabilityThe absolute difference between two independent single results, obtained usin
49、g 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 CigarettesRepeatability limit, rPa mmWGr = 23 r = 2,3Table 2 Filter rodsRepeatability limit, rPa mmWGr = 0,007 mp r = 0,007 mpNOTE mp is the mean value of the pressure drop p, expressed in pascals (Pa) (or in mmWG).4 ISO 2015 All rights
