1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 3308:2012Routine analytical cigarette-smoking machine Definitions and standardconditionsBS ISO 3308:2012 BRITISH STANDARDNational forewordThis British Standard is the UK i
2、mplementation of ISO 3308:2012. Itsupersedes BS ISO 3308:2000+A1:2009 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee AW/40, Tobacco and tobacco products.A list of organizations represented on this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.Th
3、is publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 76634 3ICS 65.160Compliance with a British Standard cannot confer immun
4、ity fromlegal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 3308:2012 ISO 2012Routine analytical cigarette-smoking machine Definitions and st
5、andard conditionsMachine fumer analytique de routine pour cigarettes Dfinitions et conditions normalisesINTERNATIONAL STANDARDISO3308Fifth edition2012-10-15Reference numberISO 3308:2012(E)BS ISO 3308:2012ISO 3308:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights r
6、eserved. 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 either ISO at the address below or ISOs member body in the country of the req
7、uester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 3308:2012ISO 3308:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative reference
8、s 13 Terms and definitions . 14 Standard conditions 34.1 Machine pressure drop 34.2 Puff duration . 34.3 Puff volume 44.4 Puff frequency 44.5 Puff profile 44.6 Restricted smoking 44.7 Puff number . 44.8 Cigarette holder 44.9 Cigarette position64.10 Ashtray position .65 Specification for the routine
9、analytical smoking machine . 65.1 General .65.2 Operating principle and puff profile . 75.3 Reliability and compensation . 75.4 Cigarette holders and smoke traps 85.5 Test atmosphere 95.6 Puff counting . 95.7 Ignition . 95.8 Smoking enclosure 9Annex A (normative) Ambient air flow around cigarettes i
10、n routine analytical smoking machines: Control and monitoring 11Annex B (informative) Description of the puffing mechanism of a piston-type smoking machine .18Annex C (informative) Diagrammatic representation of a puff profile .23Bibliography .25BS ISO 3308:2012ISO 3308:2012(E)ForewordISO (the Inter
11、national 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
12、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 st
13、andardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies fo
14、r voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.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
15、 such patent rights.ISO 3308 was prepared by Technical Committee ISO/TC 126, Tobacco and tobacco products.This fifth edition cancels and replaces the fourth edition (ISO 3308:2000), which has been technically revised. Subclause 5.8, the last formula in Annex C and the figures have been editorially r
16、evised. Italso incorporates the amendment ISO 3308:2000/Amd.1 2009.iv ISO 2012 All rights reservedBS ISO 3308:2012ISO 3308:2012(E)IntroductionExperience and knowledge gained from the use of analytical cigarette-smoking machines has highlighted a need to specify certain requirements, which are addres
17、sed in this International Standard.No machine smoking regime can represent all human smoking behaviour: it is recommended that cigarettes also be tested under conditions of a different intensity of machine smoking than those specified in this International Standard; machine smoking testing is useful
18、 to characterize cigarette emissions for design and regulatory purposes, but communication of machine measurements to smokers can result in misunderstandings about differences in exposure and risk across brands; smoke emission data from machine measurements may be used as inputs for product hazard a
19、ssessment, but they are not intended to be nor are they valid as measures of human exposure or risks. Communicating differences between products in machine measurements as differences in exposure or risk is a misuse of testing using ISO standards. ISO 2012 All rights reserved vBS ISO 3308:2012BS ISO
20、 3308:2012Routine analytical cigarette-smoking machine Definitions and standard conditions1 ScopeThis International Standard: defines smoking parameters and specifies the standard conditions to be provided for the routine analytical machine smoking of cigarettes; specifies the requirements for a rou
21、tine analytical smoking machine complying with the standard conditions.Annex A specifies the ambient air velocities surrounding cigarettes in a routine analytical smoking machine, the mechanical design of the enclosures immediately surrounding them, and the methods of air velocity measurement includ
22、ing the location where air velocity is measured.Annex B describes, as an example, the special characteristics of a typical smoking machine incorporating a piston type of puffing mechanism.Annex C includes a diagram of a puff profile and illustrates definitions and standard conditions.2 Normative ref
23、erencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 3402, Tobacco and tobacco products Atmo
24、sphere for conditioning and testing3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1test atmosphereatmosphere to which a sample or test piece is exposed throughout the testNOTE 1 It is characterized by specified values for one or more of the foll
25、owing parameters: temperature, relative humidity and pressure, which are kept within the specified tolerances.NOTE 2 The test may be carried out either in the laboratory or in a special chamber termed the “test chamber”, or in the conditioning chamber, the choice depending on the nature of the test
26、piece and on the test itself. For example, close control of the test atmosphere may not be necessary if the change in properties of the test piece is insignificant over the test period.NOTE 3 Adapted from ISO 558:1980, definition 2.3.3.2butt lengthlength of unburnt cigarette remaining at the moment
27、when the smoking is stopped3.3restricted smokingcondition that exists when the butt end of a cigarette is closed to the atmosphere between successive puffsINTERNATIONAL STANDARD ISO 3308:2012(E) ISO 2012 All rights reserved 1BS ISO 3308:2012ISO 3308:2012(E)3.4free smokingcondition that exists when t
28、he butt end of a cigarette is completely exposed to the atmosphere between successive puffs3.5pressure dropstatic pressure difference between the two ends of the test piece completely encapsulated in a measuring device such that no air can pass through the outer membrane (or wrapping); or a pneumati
29、c circuit when it is traversed by an air flow under steady conditions in which the measured volumetric flow, under standard conditions, at the output end is 17,5 ml/s3.6draw resistancenegative pressure which has to be applied to the butt end, under test conditions (see ISO 3402) in order to sustain
30、a volumetric flow of 17,5 ml/s, exiting at the butt end, when the cigarette is encapsulated in a measurement device to a depth of 9 mmNOTE 1 Any ventilation zones and the tobacco rod are exposed to the atmosphere.NOTE 2 Measurement values are expressed in pascals (Pa). They used to be expressed in m
31、illimetres water gauge (mm WG). The values given previously in mm WG are converted into pascals using the following conversion factor: 1 mm WG = 9,8067 Pa.NOTE 3 The concept of draw resistance may also be subjectively judged when a cigarette is smoked by a consumer/taste panel. Under such circumstan
32、ces, draw resistance is not measured objectively because the conditions of the formal definition are not met.3.7puff durationinterval of time during which the port is connected to the suction mechanism3.8puff volumevolume leaving the butt end of a cigarette and passing through the smoke trap3.9puff
33、numbernumber of puffs necessary to smoke a cigarette to a specified butt length3.10puff frequencynumber of puffs in a given time3.11puff terminationtermination of the connection of the port to the suction mechanism3.12puff profileflow rate measured directly behind the butt end of a cigarette and dep
34、icted graphically as a function of time3.13dead volumevolume which exists between the butt end of a cigarette and the suction mechanism3.14cigarette holderdevice for holding the mouth end of a cigarette during smoking2 ISO 2012 All rights reservedBS ISO 3308:2012ISO 3308:2012(E)3.15smoke trapdevice
35、for collecting such part of the smoke from a sample of cigarettes as is necessary for the determination of specified smoke components3.16portaperture of the suction mechanism through which a puff is drawn and to which is attached a smoke trap3.17channelelement of a smoking machine consisting of one
36、or more cigarette holders, one trap and a means of drawing a puff through the trap3.18compensationability to maintain constant puff volumes and puff profiles when the pressure drop at the port changes3.19cigarette positionposition of a cigarette on the smoking machineNOTE In particular, it is determ
37、ined by the angle made by the longitudinal axis of the cigarette and the horizontal plane when a cigarette is inserted into a cigarette holder in an analytical smoking machine.3.20mainstream smokeall smoke which leaves the butt end of a cigarette during the smoking process3.21sidestream smokeall smo
38、ke which leaves a cigarette during the smoking process other than from the butt end3.22ashtraydevice positioned under the cigarettes in their holders to collect ash falling from the cigarettes during smoking3.23clearing puffany puff taken after the cigarette has been extinguished or removed from the
39、 cigarette holder3.24ambient air flowair flow around the cigarettes during the smoking processNOTE See Annex A.4 Standard conditions4.1 Machine pressure dropThe whole of the flow path between the butt end of the cigarette and the suction mechanism shall offer the least possible resistance, and its p
40、ressure drop (see 3.5) shall not exceed 300 Pa.4.2 Puff durationThe standard puff duration (see 3.7) shall be (2,00 0,02) s. ISO 2012 All rights reserved 3BS ISO 3308:2012ISO 3308:2012(E)4.3 Puff volumeThe standard puff volume (see 3.8) measured in series with a pressure drop device of 1 x (1 5 %) k
41、Pa shall be (35,0 0,3) ml. In one puff duration (see 3.7) not less than 95 % of the puff volume shall leave the butt end of the cigarette.4.4 Puff frequencyThe standard puff frequency (see 3.10) shall be one puff every (60 0,5) s measured over 10 consecutive puffs.4.5 Puff profileThe puff profile (s
42、ee 3.12) shall be measured with an impedance of 1 x (1 5 %) kPa as specified in 4.3. It shall be bell-shaped with a maximum between 0,8 s and 1,2 s from the start of the puff. The increasing and decreasing parts of the profile shall not have more than one point of inflection each. The maximum flow r
43、ate shall be between 25 ml/s and 30 ml/s (see Annex B). At no point shall the direction of flow be reversed.NOTE Principles of suction mechanisms using a piston pump to obtain the puff profile are given in Annex B.4.6 Restricted smokingAn analytical smoking machine shall be a restricted smoker i.e.
44、fulfil the conditions for restricted smoking (see 3.3).4.7 Puff numberEach individual puff shall be counted and recorded and the puff number (see 3.9) rounded off to the nearest one-tenth of a puff, based on the puff duration.4.8 Cigarette holderThe design of the standard cigarette holder (see 3.14)
45、 is such that it shall cover 9,0 mm, with a range of 8,0 mm to 9,5 mm, from the butt end of a cigarette, and shall be impermeable to smoke components and to air. Labyrinth seals with dimensions appropriate for the diameter of the cigarettes under test shall be used in the cigarette holder.Either the
46、 cigarette holder or the smoke trap shall be equipped with a perforated disc (washer) of plain expanded synthetic rubber, closed-cell sponge grade, which partly obstructs the butt end of the cigarette. The synthetic rubber shall have a density of 150 kg/m3, low swell oil resistance and compression-d
47、eflection range of 35 kPa to 63 kPa. Four labyrinth seals shall be used; the one closest to the butt end (back seal) shall be reversed. The dimensions of the washer and labyrinth seals are given in Figure 1. The washer shall be supported by a structure with a hole in its centre of 4 mm diameter.The
48、axis of the holder shall be within 0 to + 5 of the horizontal and the holder shall ensure that the cigarette is held within 5 of the holder axis.An example of a suitable assembly is given in Figure 2.Manufacturing tolerances for the individual components of the cigarette holder result in an uneven t
49、olerance about the specified 9 mm insertion depth.4 ISO 2012 All rights reservedBS ISO 3308:2012ISO 3308:2012(E)Dimensions in millimetresa) Labyrinth sealb) WasherCigarette diameter A B C4,5 to 5,49 1,45 2,5 45,5 to 6,49 1,7 3 4,56,5 to 7,49 1,95 3,5 5,57,5 to 9 2,2 4 6,5Figure 1 Cigarette holder: Labyrinth seal and perforated disc (washer) (dimensional details) ISO 2012 All rights reserved 5BS ISO 3308:2012ISO 3308:2012(E)Key1 labyrinth seals2 washer support3 washer4 labyrinth seal (reversed)5 labyrinth capNOTE W
