1、BRITISH STANDARD BS ISO 9512:2002 Cigarettes Determination of ventilation Definitions and measurement principles ICS 65.160 BS ISO 9512:2002 This British Standard was published under the authority of the Standards Policy and S t r a t e g y C o m m i t t e e o n 24 February 2003 BSI 24 February 2003
2、 ISBN 0 580 41302 0 National foreword This British Standard reproduces verbatim ISO 9512:2002 and implements it as the UK national standard. It supersedes BS 5381-6:1993 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee AW/40, Tobacco and tobacco produc
3、ts, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section e
4、ntitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compli
5、ance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related
6、international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 19 and a back cover. The BSI copyright date displayed in this document indicates when the document was
7、last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 9512:2002(E)INTERNATIONAL STANDARD ISO 9512 Second edition 2002-06-15 Corrected version 2002-12-15 Cigarettes Determination of ventilation Definitions and measurement principles Cigarettes Dtermination du ta
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13、 esedevrBSISO9512:2002iiIS:2159 O2002(E) I SO 2002 All irthgs ersedevr iiiContents Foreword iv 1 Scope 1 2 Normative references 1 3 Terms and definitions. 1 4 Principle . 3 5 Standard conditions 3 6 Requirements for apparatus 3 7 Sampling 5 8 Checking of apparatus 5 9 Procedure. 5 10 Expression of r
14、esults 6 11 Precision 6 12 Test report 6 Annex A (normative) Calibration of ventilation standards. 7 Annex B (normative) Calibration of ventilation measurement instruments using ventilation and pressure drop standards 11 Annex C (informative) Measurement of ventilation airflows of cigarettes 13 Anne
15、x D (informative) Determination of the leakage of the ventilation measurement system 15 Annex E (informative) Results of interlaboratory test 19 BSISO9512:2002iiiIS:2159 O2002(E) vi I SO 2002 All irthgs ersedevrForeword ISO (the International Organization for Standardization) is a worldwide federati
16、on 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
17、. 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 standardization. International Standards are drafted in accordance w
18、ith the rules given in the ISO/IEC Directives, Part 3. 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 for voting. Publication as an International Standard requires appr
19、oval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 9512 was prepared by Tec
20、hnical Committee ISO/TC 126, Tobacco and tobacco products, Subcommittee SC 1, Physical and dimensional tests. This second edition cancels and replaces the first edition (ISO 9512:1993), which has been technically revised. Annexes A and B form a normative part of this International Standard. Annexes
21、C to E are for information only. This corrected version of ISO 9512:2002 incorporates the following corrections. Figures 1 b) and d) have been corrected and a few minor editorial changes have been made. BSISO9512:2002ivINTENRATIONAL TSANDADR IS:2159 O2002(E)I SO 2002 All irthgs ersedevr 1Cigarettes
22、Determination of ventilation Definitions and measurement principles 1 Scope This International Standard specifies a method for the determination of ventilation which is applicable to cigarettes. 2 Normative references The following normative documents contain provisions which, through reference in t
23、his text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the m
24、ost recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 3308, Routine analytical cigarette-smoking machine Defin
25、itions and standard conditions ISO 3402, Tobacco and tobacco products Atmosphere for conditioning and testing ISO 6565, Tobacco and tobacco products Draw resistance of cigarettes and pressure drop of filter rods Standard conditions and measurement 3 Terms and definitions For the purposes of this Int
26、ernational Standard, the following terms and definitions apply. 3.1 ventilation aspiration of atmospheric air into an unlit cigarette other than through its front area NOTE Dilution is the effect of ventilation on the smoke concentration. 3.2 front area that end of a cigarette which is intended to b
27、e lit 3.3 total airflow 100 % of the volumetric airflow leaving the mouth end of an unlit cigarette which is encapsulated in a measurement device having an insertion depth as defined in ISO 3308 NOTE Under standard test conditions, the total airflow, Q, is 17,5 ml/s. 3.4 generator for total airflow
28、device to maintain a constant total airflow at the exit of the mouth end of a cigarette when encapsulated in a measurement head having an insertion depth as defined in ISO 3308 BSISO9512:20021IS:2159 O2002(E) 2 I SO 2002 All irthgs ersedevr3.5 ventilation airflow volumetric airflow entering an unlit
29、 cigarette other than through the front area of the cigarette NOTE The ventilation airflow is standardized to the negative pressure at the mouth end of the cigarette, created by the draw resistance of the cigarette when encapsulated in a measurement device having an insertion depth as defined in ISO
30、 3308. 3.6 total ventilation total amount of lateral air entering the cigarette (other than through its front area) when encapsulated in a measurement device having an insertion depth as defined in ISO 3308 3.7 degree of ventilation ratio, expressed as a percentage, of the ventilation airflow to the
31、 total airflow See Figures 1 b), 1 c) and 1 d). 3.8 components of total ventilation that air entering through the cigarette paper, and through the materials comprising and attaching the filter to the tobacco rod, contributing to total ventilation See Figures 1 b), 1 c) and 1 d). 3.9 filter ventilati
32、on that air entering the cigarette through the filter joining paper (tipping paper) between the covered part of the mouth end and the beginning of the tobacco rod See Figure 1 b). 3.10 paper ventilation that air entering the cigarette through the envelope covering the whole length of the tobacco rod
33、 See Figure 1 b). 3.11 butt ventilation that air entering the cigarette between the covered part of the mouth end of the cigarette and the position defined by the butt length appropriate to the cigarette See Figure 1 c). 3.12 burnable tobacco rod ventilation that air entering the cigarette through i
34、ts paper between the position defined by the butt length appropriate to the cigarette and the end of the cigarette which would be lit See Figure 1 c). 3.13 tipping-paper ventilation that air entering the cigarette through the filter joining paper (tipping paper) between the covered part of the mouth
35、 end and the tobacco rod end of the tipping paper See Figure 1 d). BSISO9512:20022IS:2159 O2002(E) I SO 2002 All irthgs ersedevr 33.14 cigarette-paper ventilation air entering the cigarette through the cigarette paper between the end of the cigarette which would be lit and the mouth end of the tippi
36、ng paper See Figure 1 d). 4 Principle Air is drawn, at a constant flow rate, in the standard smoking direction through an unlit cigarette. The individual components of ventilation are measured separately. The degrees of ventilation are obtained by calculation. 5 Standard conditions 5.1 Prior to meas
37、urement, the cigarettes shall be conditioned in an atmosphere as specified in ISO 3402. 5.2 Ventilation measurements shall be made on unlit cigarettes in accordance with the test atmosphere as specified in ISO 3402. 5.3 The direction of airflow in the cigarette shall be that which would occur when t
38、he cigarette is smoked. 6 Requirements for apparatus 6.1 The apparatus used shall allow separate assessment of the ventilation components shown in Figure 1. 6.2 The cigarettes shall be held in the measurement head, by an encapsulation device, with an encapsulation depth as defined by ISO 3308. 6.3 S
39、eals used to hold the cigarette and partition ventilation measurement regions shall be sized and positioned appropriately to the dimensions of the product under test to minimise any systematic influence on measured parameters. See Figure 2. 6.4 The measuring pressure surrounding the cigarette contai
40、ned in the measurement head, other than at the front end and the mouth end enclosed in the holding seal, shall not be more than 20 Pa lower than that of the testing atmosphere when the total airflow is applied. NOTE Experiments conducted during the development of this method show that the measured v
41、entilation flows reduce proportionally to increased pressure drop of the apparatus ventilation measurement path. 6.5 A generator for total airflow shall be used to establish the measurement conditions. Deviations from the total airflow shall not exceed 0,10 ml/s. NOTE A critical flow orifice (CFO) i
42、s normally used to establish a constant total airflow for vacuum-based measurement systems. 6.6 The device used for measurement of ventilation airflows shall have no intrinsic effect on the volumetric airflow measurement. See Figure 2. BSISO9512:20023IS:2159 O2002(E) 4 I SO 2002 All irthgs ersedevrK
43、ey 1 Overlap 2 Cigarette paper 3 Tipping paper 4 Butt mark 5 Standard depth of encapsulation (ISO 3308) 6 Tobacco rod 7 Filter 8 Encapsulation device Total airflow, Q = 17,5 ml/s Degree of filter ventilation, F F 100 % Q V Q = Degree of paper ventilation, P P 100 % Q V Q = Degree of total ventilatio
44、n, FP FP 100 % QQ VVV Q + =+= Degree of burnable tobacco rod ventilation, R R 100 % Q V Q = Degree of butt ventilation, B B 100 % Q V Q = Degree of cigarette paper ventilation, C C 100 % Q V Q = Degree of tipping paper ventilation, M M 100 % Q V Q = Figure 1 Different degrees of ventilation BSISO951
45、2:20024IS:2159 O2002(E) I SO 2002 All irthgs ersedevr 5Key 1 Test atmosphere conforming to ISO 3402 5 Ventilation chamber 2 Ventilation flow measurement devices 6 Fixed holding seal 3 Encapsulation depth conforming to ISO 3308 7 Device to measure cigarette draw resistance 4 Adjustable partitioning s
46、eals 8 Total airflow Figure 2 Schematic for ventilation flow measurement 7 Sampling A sample shall be taken which is representative, on a statistical basis, of the population to be characterized. Samples shall be free of visible defects and creases, which may impair measurement performance. 8 Checki
47、ng of apparatus The measurement device shall be calibrated in accordance with the manufacturers recommendations, ensuring the device is leakfree prior to implementing or checking calibration. 9 Procedure 9.1 Conditioning of test cigarettes Condition the cigarette sample selected for the test as spec
48、ified in 5.1. BSISO9512:20025IS:2159 O2002(E) 6 I SO 2002 All irthgs ersedevr9.2 Calibration Calibrate the measurement device using calibration standards and calibration procedure in accordance with annex B. NOTE Any calibration needs to span the range of values expected from the test sample require
49、d on the products to be measured. 9.3 Measurement Ensure that the measurement apparatus has been adjusted to suit the dimensions of the cigarette to be tested. Insert the cigarette samples to be tested into the measurement head and use the apparatus in accordance with the manufacturers instructions. Record the ventilation measurement parameters. 10 Expression of results The reported value of any ventilation measur
