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1、INTERNATIONAL STANDARD IS0 7210 Second edition 1997-01-15 Routine analytical cigarette-smoking machine - Additional test methods Machine B fumer analytique de routine pour cigarettes - Mbthodes d essais complbmenfaires Reference number IS0 7210:1997(E) Copyright International Organization for Standa
2、rdization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:13 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7210:1997(E) Foreword IS0 (the International Organization for Standardization) is a worldw
3、ide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on th
4、at committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted b
5、y the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 7210 was prepared by Technical Committee lSO/TC 126, Tobacco and tobacco products, Su
6、bcommittee SC 1, Physical and dimensional tests. This second edition cancels and replaces the first edition (IS0 7210:1983), which has been technically revised. 0 IS0 1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any
7、 means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 l CH-1211 Geneve 20 l Switzerland Internet central I isocsisoch x.400 c=ch; a=400net; p=iso; o=isocs; s=central Pri
8、nted in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:13 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD o
9、 IS0 IS0 7210:1997(E) Routine analytical cigarette-smoking machine - Additional test methods 1 Scope This International Standard specifies additional test methods for routine analytical cigarette- smoking machines intended to check the conformity of these machines with IS0 3308. It only establishes
10、additional test methods for smoking machines and does not deal with actual smoking, which is described in other International Standards. It is composed of three sections relating to: - the determination of pressure drop (clause 3); - the determination of puff profile (clause 4); - the determination
11、of restricted smoking (clause 5). 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and p
12、arties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 3308:1991, Routine analytical cigar
13、ette-smoking machine - Definitions and standard conditions. IS0 3402:i 991, Tobacco and tobacco products - Atmosphere for conditioning and testing. 3 Determination of pressure drop 3.1 Definition For the purposes of this International Standard, the following definition applies. 3.1.1 pressure drop:
14、Difference in static pressure between any two points of the pneumatic circuit of a smoking machine that are passed by a current of air at a constant flow rate of 17.5 ml/s. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standar
15、ds 1/9972545001 Not for Resale, 04/24/2007 23:16:13 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7210:1997(E) 0 IS0 3.2 Principle Measurement, under well-specified air flow conditions, of the pressure drop of a smoking machine by means of an appropriate manometer. 3.
16、3 Apparatus (see figure 1) The whole of the flow path between the butt end of the cigarette and the suction mechanism shall offer the least possible resistance and its pressure drop shall not exceed 300 Pa. The test apparatus shall be capable of - sucking a constant flow of air which is unaffected b
17、y the pressure drop of the system under test; - measuring the pressure drop with sufficient accuracy. M F - - Vacuum induced flow controller r H Test head point F Flowmeter W Wide-bore tubing T Apparatus under test M Manometer - Test method connections NOTE - Arrows indicate the direction of air flo
18、w. Figure 1 - Pneumatic circuit of a typical apparatus 3.4 Test atmosphere All measurements shall be carried out under standard ambient conditions of temperature and relative humidity as specified in IS0 3402. 2 Copyright International Organization for Standardization Provided by IHS under license w
19、ith ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:13 MDTNo reproduction or networking permitted without license from IHS -,-,- 0 IS0 IS0 7210:1997(E) 3.5 Procedure 3.5.1 General The flow of air through the smoking machine shall always be in the same direction as
20、 during the puffing cycle, i.e. from the cigarette to the suction source. The air used for measurement shall be from the test atmosphere. 3.5.2 Testing 3.5.2.1 Connect the manometer M as indicated in figure 1 and set it to zero. 3.5.3.2 Connect the flowmeter F as indicated in figure 1 and establish
21、an air flow of 17,5 ml * 0,l ml/s. 3.5.3.3 Disconnect the flowmeter F and attach a suitable length of wide-bore tubing W to the test head point H. Read the pressure, if any, on the manometer M. Record the value as PD,. 3.5.3.4 Attach the free end of the wide-bore tubing W to the point in the smoking
22、 machine from which the puffing source was disconnected. Read the pressure on manometer M. Record the value as PD,. 3.5.3.5 Calculate the pressure drop (PD, - PD,) . 3.5.3.6 Repeat the operation for each channel of the smoking machine. 3.6 Expression of results The following values shall be recorded
23、: - the pressure drop for each channel, in pascals; - the test atmosphere used. 4 Determination of puff profile 4.1 Definition For the purposes of this International Standard, the following definition applies. 4.1.1 puff profile: Flow rate measured directly behind the butt end of the cigarette, and
24、depicted graphically as a function of time. 4.2 Principle Continuous measurement of the flow rate of air of a puff through a pressure drop device of 1 kPa (see IS0 3308:i 991 s subclause 4.3). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NA
25、SA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:13 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7210:199.7(E) 0 IS0 4.3 Apparatus The apparatus shall comprise the elements shown in the principle diagram (figure 2), i.e. the diagram of elements re
26、quired for the two alternative measuring systems, A and B, with two different levels of sophistication. Pressure drop standard Laminar flow sensor Smoking machine Puff initiation signal l- Pressure transducer System A Linearizer Integrator tb Recorder 1 I System B digital converter ri Microprocessor
27、 f Visual L display unit Figure 2 - Principle diagram 4 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:13 MDTNo reproduction or networking permitted without license from I
28、HS -,-,- 0 IS0 IS0 7210: 1997(E) 4.3.1 System A The signal delivered by the pressure transducer is linearized by appropriate circuits and transmitted to an integrator and a recording apparatus. The system can record a picture of the puff profile and measure its volume. 4.3.2 System B This system use
29、s digital conversion and a computer. 4.3.3 Requirements for both systems The elements used in the system shall fulfil the following conditions: - laminar flow element having a nominal pressure drop of 100 Pa + 10 Pa at a flow of 17,5 ml/s; - pressure transducer with a range of 500 Pa, a response tim
30、e of 1 ms, and a response frequency of 1 kHz. The above apparatus provides the means to obtain flow rate and time profiles for puffing as shown in figure 3. At time t= 0, suction may be applied to the cigarette by means of a piston pump. The resulting flow rate 0 at the butt end of the cigarette var
31、ies to give a bell-shaped puff profile. The maximum flow rate m is reached at time tm. The flow rate then decreases during the puff duration to reach the value d at time !d when the puffing source ceases to apply suction, but a pressure differential exists. Finally, the flow rate decreases slowly to
32、 0, a value reached at time te. The standard puff profile so be such that 25 ml/s I 0m I 30 ml/s at a time tm, such that 0,8 S I tm I1,2 S. The standard puff duration is td = 2 s, and the time te is consequently limited by the standard puff frequency to te = 60 S. The puff volume, V, may be calculat
33、ed on the basis of the shaded area in figure 3 from the formula: v = I,fecD(t)dt = A + B = j-;(t)dt + f(t)dr 5 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:13 MDTNo repr
34、oduction or networking permitted without license from IHS -,-,- IS0 7210:1997(E) 0 IS0 The consequence of the standard conditions is the following: V= 35 ml A= fd I 0 aJ t dt 2 0,95v 0 Puff termination Start 0 4 03 1 t, I,2 2 td te Time, t (s) Puff duration b Time during which flow exists Figure 3 -
35、 Example of a diagrammatic representation of a puff profile with cigarette 5 Verification of restricted smoking 5.1 Definitions For the purposes of this International Standard, the following definitions apply. 5.1 .l restricted smoking: Condition that exists when the butt end of a cigarette is close
36、d to the atmosphere between successive puffs. 51.2 smoulder stream smoke: All smoke which leaves the butt end of the cigarette during the interval of time between successive puffs. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical
37、 Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:13 MDTNo reproduction or networking permitted without license from IHS -,-,- 0 IS0 IS0 7210:1997(E) 5.2 Principle Measurement of the volume of the smoulder stream smoke between two puffs for machines of discontinuous function or between two su
38、ction strokes for machines of continuous function. NOTE - For smoking machines with permanent connections of the smoking channel, this test is not necessary. 5.3 Apparatus Apparatus permitting an assembly as shown in figure 4, so that - the length of a soap film bubble flowmeter does not exceed 12 c
39、m; - there is close contact between the cigarette holder or the glass tube and the cigarette. 5.4 Procedure Carry out the test during smoking of the second half of the total length of the cigarette after a soap bubble has been introduced into the bubble flowmeter. 5.5 Expression of results Note the
40、flow rate of the smoulder stream smoke, in millilitres per minute. The result shall not exceed 1 ml/min. Key 1 Rubber connection 2 Soap film bubble flowmeter 3 Cigarette holder or glass tube 4 Cigarette Figure 4 - Diagram of test apparatus for restricted smoking Copyright International Organization
41、for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:13 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7210:1997(E) Descriptors: tobacco, test equipment, smoking machines, tests, conformity tests. Price based on 7 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:13 MDTNo reproduction or networking permitted without license from IHS -,-,-