1、BRITISH STANDARD BS 5381-8: 1997 ISO 3550-2: 1997 Methods for determination of physical properties of tobacco and tobacco products Part 8: Loss of tobacco from cigarette ends using a rotating cubic box (sismelatophore) ICS 65.160 BS 5381-8:1997 This British Standard, having been prepared under the d
2、irection of the Consumer Products and Services Sector Board, was published under the authority of the Standards Board and comes into effect on 15 November 1997 BSI 05-1999 ISBN 0 580 28804 8 National foreword This British Standard reproduces verbatim ISO 3550-2:1997 and implements it as the UK natio
3、nal standard. The UK participation in its preparation was entrusted to Technical Committee AW/40, Tobacco and tobacco products, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or p
4、roposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement in
5、ternational or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to i
6、nclude all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pa
7、ges i and ii, theISO title page, page ii, pages1to3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date Comments BS 5
8、381-8:1997 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3 Principle 1 4 Apparatus 1 5 Sampling 2 6 Procedure 2 6.1 Conditioning of test sample 2 6.2 Test portion 2 6.3 Determination of water content 2 6.4 Determination
9、 2 7 Calculation 3 7.1 Loss rate 3 7.2 Calculation of specific tobacco fallout values 3 7.2.1 End-related tobacco fallout 3 7.2.2 Area-related tobacco fallout 3 8 Test report 3 Figure 1 Cubic rotating box (sismelatophore) 2ii blankBS 5381-8:1997 ii BSI 05-1999 Foreword ISO (the International Organiz
10、ation 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 been established
11、 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 standardization. D
12、raft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO3550-2 was prepared by Technical Committee ISO/TC1
13、26, Tobacco and tobacco products, Subcommittee SC1, Physical and dimensional tests. ISO 3550 consists of the following parts, under the general title Cigarettes Determination of loss of tobacco from the ends: Part 1: Method using a rotating cylindrical cage; Part 2: Method using a rotating cubic box
14、 (sismelatophore). Descriptors: Cigarettes, tests, mechanical tests, determination, losses, tobacco, test equipment. BS 5381-8:1997 BSI 05-1999 1 Introduction The loss of tobacco from cigarette ends, which particularly affects short strands, is a nuisance for the industry as well as for the consumer
15、. From this standpoint, the greater a cigarettes resistance to loss from its ends, the higher its quality. The measuring devices available are based on the rotation of a cigarette-containing device. This International Standard describes two particular types of devices. The first, described in ISO355
16、0-1, comprises a rotating cylindrical cage through which tobacco is allowed to fall into a weighing vessel; the second, described in this part of ISO3550, uses a cubic box rotating about its main diagonal axis. The first system principally permits determination of losses undergone by the cigarette d
17、uring the manufacturing and packaging processes, and the second one losses undergone throughout the distribution network and in the smokers pocket. The two methods, are not mutually exclusive and other acceptable methods exist which are based upon slightly different types of device. 1 Scope This par
18、t of ISO 3550 specifies a method for the determination of loss of tobacco from cigarette ends using a cubic rotative box (sismelatophore). It applies mainly to the determination of the losses undergone throughout the distribution network and in the smokers pocket. NOTEA method of determination of lo
19、ss of tobacco from the ends using a rotating cylindrical cage is described in ISO3550-1. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO3550. At the time of publication, the editions indicated were val
20、id. All standards are subject to revision, and parties to agreements based on this part of ISO3550 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards
21、. ISO 2971:, Cigarettes and filter rods Determination of nominal diameter Method using the laser beam measuring apparatus 1) . ISO 3402:1991, Tobacco and tobacco products Atmosphere for conditioning and testing. ISO 6488:, Tobacco Determination of water content Karl Fischer method 2) . ISO 8243:1991
22、, Cigarettes Sampling. 3 Principle A test portion of a given number of cigarettes is subjected to a random series of impacts repeated in such a way as to bring about artificially a loss of tobacco strands at the ends. These impacts are achieved by tumbling the portion in a cubic box revolving unifor
23、mly around an axis coincident with a principal diagonal. The tobacco loss, expressed in parts per thousand(), is given by calculating the ratio of theloss of mass of cigarettes in a given time to the initial mass of the test portion. As a first result of the test, the mass, m L , of tobacco falling
24、from the test portion is determined. From this mass, m L , and the non-tobacco mass, m 2(cigarette paper, filter, glue, etc.), the characteristics of the cigarette (i.e. the loss rate of tobacco, the loss of tobacco per open end and per unit cross section of the open end) are determined. 4 Apparatus
25、 4.1 Conditioning chamber, capable of controlling the enclosed atmosphere in accordance with the requirements of ISO3402. 4.2 Cubic rotating box (sismelatophore) (seeFigure 1), consisting of: a) a cubic box, made of poly(methyl methacrylate) or any other plastics material having equivalent propertie
26、s, the inside edge of which measures140mm 5mm, held by two trihedral supports in such a way that one of the principal diagonals is horizontal; one of the faces of the cubic box can be opened (groove or hinge); b) one half-spindle, clamped to a timing micromotor device, which rotates the cube at60min
27、 1 2min 1 . The other half-spindle supports a spring which holds the cube in position during rotation; this allows the cube to be freed for filling or emptying; c) a time-switch for regulating the duration of operation of the micromotor. 1) To be published. (Revision of ISO 2971:1987) 2) To be publi
28、shed. (Revision of ISO 6488:1981) BS 5381-8:1997 2 BSI 05-1999 4.3 Device for the measurement of the diameter of the cigarettes, in accordance with ISO2971. 4.4 Analytical balance, capable of weighing to an accuracy of 0,0001g. 5 Sampling Carry out sampling in accordance with one of the procedures g
29、iven in ISO8243 where applicable or, if not, by a procedure relevant to the aim of the test. In the latter case, an appropriate reference to, or details of, the sampling procedure used shall be given in the test report. 6 Procedure 6.1 Conditioning of test sample Place the test sample in the conditi
30、oning chamber(4.1) and condition the sample in accordance with ISO3402. 6.2 Test portion Take, as the test portion, 20 cigarettes from the conditioned test sample (see6.1). 6.3 Determination of water content Take a new test portion conditioned as specified in6.1 and determine the water content in ac
31、cordance with ISO6488. NOTEAlthough the water content is not used when calculating the loss of tobacco from cigarette ends, it may affect the results considerably. The water content should, therefore, be determined and reported. 6.4 Determination 6.4.1 Operate in the test atmosphere specified in ISO
32、3402. 6.4.2 Determine the mean diameter of the cigarettes to be tested to the nearest0,001mm in accordance with ISO2971. 6.4.3 Weigh the test portion (6.2) to the nearest0,001g, m 0 , immediately introduce it into the sismelatophore (4.2) and operate the apparatus for120 s 6s. NOTEThis duration was
33、selected experimentally as giving good sensitivity in an acceptable time. 6.4.4 Open the apparatus and remove the cigarettes with care. 6.4.5 Weigh the test portion again to the nearest0,001g after tumbling (m 1 ) and calculate the fallout quantity (m 0 m 1 )=m Lor weigh directly the mass of the deb
34、ris collected from the apparatus. Cut the paper lengthways with a sharp blade and separate the tobacco from the paper, adhesive and, if necessary, from the filter (in the case of filter cigarettes). Weigh separately materials other than tobacco (corresponding to mass m 2 ). Repeat the test5 to10 tim
35、es according to the accuracy desired. Figure 1 Cubic rotating box (sismelatophore) BS 5381-8:1997 BSI 05-1999 3 7 Calculation 7.1 Loss rate The rate of loss, expressed in parts per thousand(), of the tobacco from the ends of plain or filter cigarettes is given by the formula: or where 7.2 Calculatio
36、n of specific tobacco fallout values 7.2.1 End-related tobacco fallout The mass of the end-related tobacco fallout, m LOE , in milligrams per open end, is given by 7.2.2 Area-related tobacco fallout The mass of the area-related tobacco fallout, m LOA , in milligrams per square centimetre of open end
37、, is given by where 8 Test report The test report shall include the following information: all information necessary for the complete identification of the sample(s); characteristic data of cigarettes (length, diameter, number of open ends); method and date of sampling; date of testing; number of ci
38、garettes in the test sample; water content; number of single measuring results; mean value for the single measuring results; minimum and maximum value of single measuring results; standard deviation for the single measuring results if their number is 3; coefficient of variation for the single measur
39、ing results if their number is 3. It shall also mention any operating conditions not specified in this part of ISO3550 as well as any circumstances which may have influenced the results. m 0 is the initial mass, in grams, of the test portion; m 1 is the mass, in grams, of the test portion after tumb
40、ling; m 2 is the mass, in grams, of the cigarette paper together with the filter, the glue, etc.; %m is the loss of mass, in grams, of the cigarettes during tumbing. 1000 m 0 m 1 m 0 m 2 - 1000 %m m 0 m 2 - m LOE m L q.q OE - = m LOA m L q.A.q OE - = m L is the mass of fallout, in milligrams, relate
41、d to the test portion; A is the area, in square centimetres, of one open end; q is the number of cigarettes in the test portion; q OE is the number of open ends per cigarette. NOTEq OEis equal to1 for filter cigarettes and 2 for plain cigarettes.BS 5381-8: 1997 ISO 3550-2: 1997 BSI 389 Chiswick High
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