1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 20193:2012Tobacco and tobacco products Determination of the widthof the strands of cut tobaccoBS ISO 20193:2012 BRITISH STANDARDNational forewordThis British Standard is t
2、he UK implementation of ISO 20193:2012. The UK participation in its preparation was entrusted to T e c h n i c a l Committee AW/40, Tobacco and tobacco products.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to incl
3、ude all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012.ISBN 978 0 580 67282 8 ICS 65.160 Compliance with a British Standard cannot confer immunity from legal obligations.This B
4、ritish Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 20193:2012 ISO 2012Tobacco and tobacco products Determination of the width of the strands of cut tobaccoTabac et
5、produits du tabac Dtermination de la largeur des brins de tabac hachNORME INTERNATIONALEISO20193First dition2012-11-15Numro de rfrenceISO 20193:2012(E)BS ISO 20193:2012ISO 20193:2012(E)ii ISO 2012 Tous droits rservsDOCUMENT PROTG PAR COPYRIGHT ISO 2012Droits de reproduction rservs. Sauf prescription
6、 diffrente, aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compris la photocopie et les microfilms, sans laccord crit de lISO ladresse ci-aprs ou du comit membre de lISO dans le pays du demandeur.ISO
7、copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPubli en SuisseBS ISO 20193:2012ISO 20193:2012(E) ISO 2012 Tous droits rservs iiiSommaire PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 P
8、rinciple 1Apparatus . 26 Procedure. 26.1 General . 26.2 Sampling . 26.3 Preparation of the samples 26.4 Preparation of the strands 26.5 Determination of cut width 27 Expression of results 38 Precision . 39 Test report . 3Annex A (informative) Example of a sample holder . 5Annex B (informative) Examp
9、le of a data sheet 6Bibliography 7BS ISO 20193:2012ISO 20193:2012(E)ForewordISO (the International 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
10、 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. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with
11、 the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.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 Internat
12、ional Standards adopted by 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.Attention is drawn to the possibility that some of the elements of this document may be
13、the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 20193 was prepared by Technical Committee ISO/TC 126, Tobacco and tobacco products, Subcommittee SC 1, Physical and dimensional tests.iv ISO 2012 Tous droits rservsBS ISO 20193:2012NORME
14、 INTERNATIONALE ISO 20193:2012(E)Tobacco and tobacco products Determination of the width of the strands of cut tobacco1 ScopeThis International Standard specifies a method for the determination of the width of strands of cut tobacco. It is only applicable if there is a uniform cut width.NOTE There a
15、re other ways of measuring the width of the strands of cut tobacco. A system with the same accuracy can be used, for example a microscope with an internal fitted ruler.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated reference
16、s, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 216, Writing paper and certain classes of printed matter Trimmed sizes A and B series, and indication of machine directionISO 3402, Tobacco and tobacco prod
17、ucts Atmosphere for conditioning and testingISO 8243, Cigarettes SamplingISO 15592-1, Fine-cut tobacco and smoking articles made from it Methods of sampling, conditioning and analysis Part 1: SamplingISO 15592-2, Fine-cut tobacco and smoking articles made from it Methods of sampling, conditioning an
18、d analysis Part 2: Atmosphere for conditioning and testing3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1cut widthwidth of a strand of tobacco4 PrincipleTaking into consideration the fact that the tobacco samples to be analysed have a uniform c
19、ut width and that the mass of the individual tobacco strands may be disregarded, 20 strands of at least 20 mm long are randomly taken from the total test portion and measured at five equidistant points to determine their cut width.A statistical conclusion for the population may be drawn from the res
20、ulting 100 values. ISO 2012 Tous droits rservs 1BS ISO 20193:2012ISO 20193:2012(E)ApparatusNormal laboratory apparatus and, in particular, the following items.5.1 Sample holder, capable of holding the strands in a fixed position.Annex A gives an example of a holder including guidance for its suitabl
21、e dimensions.5.2 Measuring device, with an accuracy of at least 0,1 mm.6 Procedure6.1 GeneralFor production control, samples can be selected just after cutting and measured rapidly in order to minimize the influence of ambient conditions.If packed samples are analysed, the atmosphere for the prepara
22、tion of the strands and for the determination of the cut width of fine-cut tobacco shall be in accordance with the testing atmosphere specified in ISO 15592-2; for cigarettes, ISO 3402 shall be applied accordingly.6.2 SamplingTake the samples in accordance with ISO 15592-1 or ISO 8243.6.3 Preparatio
23、n of the samplesIf samples are prepared from the packed product, a test portion of 50 g is taken.If samples are prepared from the packed product, they shall be conditioned according to ISO 15592-2 for fine-cut tobacco or ISO 3402 for cigarettes. After conditioning, spread out the test portion.Spread
24、 out the test portion as evenly as possible on an area of size A3 in accordance with ISO 216.6.4 Preparation of the strandsRandomly take from the test portion 20 strands at least 20 mm long which have been cut in parallel. If it is not possible to select strands with a length of 20 mm, a single meas
25、urement shall be made on each of 100 shorter selected strands.Secure the strands to a sample holder (5.1). Affix each strand to the surface of the sample holder perpendicular to the lines on the sample holder, taking care to ensure that the strands lie flat and are not twisted.When the strands have
26、been affixed to the sample holder, it is covered with a transparent strip in order to secure the strands position.When securing the strands, take care to avoid stretching. Artificial damage to the strands should be avoided.6.5 Determination of cut width6.5.1 GeneralDetermine the cut width immediatel
27、y after securing the strands.Measure the cut width of each of the strands prepared in accordance with 6.4 in accordance with the procedure described in 6.5.2.2 ISO 2012 Tous droits rservsBS ISO 20193:2012ISO 20193:2012(E)6.5.2 Single measurementsThe single measurements shall be made either on or dir
28、ectly adjacent to the lines on the sample holder (5.1).State the cut width to the nearest 0,05 mm.7 Expression of resultsCalculate the arithmetic mean per strand from the individual measurements and report to the nearest 0,1 mm.Calculate the mean value and standard deviation from the respective mean
29、 values for the 20 or the 100 strands. Give the mean value to the nearest of 0,1 mm, the standard deviation to the nearest 0,01 mm.Enter the evaluated data in a data sheet as illustrated in the example in Annex B.8 PrecisionThe difference between the mean of five measurements per strand, obtained wi
30、thin the shortest feasible time interval by the same operator working on identical sample material and using the same apparatus will exceed the repeatability limit r on average not more than once in 20 cases in the normal operation of the method.The difference between two results, reported by two la
31、boratories for the same sample material will exceed the reproducibility limit R on average not more than once in 20 cases in the normal operation of the method.A collaborative study involving 14 laboratories to determine the cut width yielded the values shown in Table 1 for the repeatability limit r
32、 and reproducibility limit R as well as for the standard deviations for repeatability and reproducibility, srand sR(see References 1 and 2).Table 1 Summary of results of the collaborative studyPrecision dataWidth of strands of cut tobacco mm0,4 1,0 1,6 3,0Repeatability limit r 0,11 0,21 0,30 0,81Sta
33、ndard deviation for repeatability sr0,040 0,073 0,109 0,288Reproducibility limit R 0,13 0,21 0,33 0,98Standard deviation for reproducibility sR0,047 0,073 0,118 0,351NOTE The high variability is caused by the cutters, producing a small cut of 0,4 mm.9 Test reportThe test report shall contain at leas
34、t the following information:a) all particulars necessary for identification of the sample (type of sample, origin of sample, designation);b) reference to this International Standard, i.e. ISO 20193;c) time and manner of sampling;d) information on conditioning;e) time of delivery of the sample;f) dat
35、e and time of testing; ISO 2012 Tous droits rservs 3BS ISO 20193:2012ISO 20193:2012(E)g) room temperature at the time of testing;h) test results and units in which these are stated;i) special features observed during the test.4 ISO 2012 Tous droits rservsBS ISO 20193:2012ISO 20193:2012(E)Annex A (in
36、formative) Example of a sample holderA.1 GeneralIn the appendix, add the schematic diagram of measurement about the strands with some special shapes, such as furcation, slant. Regulate the position of measurement.Date: _ Lab: _ Sample: _Lab. condition: _ RH: _ Temp.: _Figure A.1 Example of a sample
37、holderA.2 Guidance for suitable dimensionsSample holder with dimensions 20 mm 110 mm, subdivided by five parallel lines, to the longer side, distance between the lines (3,5 0,5) mm.NOTE A microscope with an internal fitted ruler can be used. ISO 2012 Tous droits rservs 5BS ISO 20193:2012ISO 20193:20
38、12(E)Annex B (informative) Example of a data sheetLaboratory:Time and kind of sampling:Measurement procedure applied:Cut width (mm)Mean per strand1stmeasure ment2ndmeasure ment3rdmeasure ment4thmeasure ment5thmeasure mentSample1ststrand 2ndstrand 3rdstrand Date of measure-ment:4thstrand 5thstrand 6t
39、hstrand Room temperature:7thstrand 8thstrand 9thstrand Package humidity:10thstrand 11thstrand 12thstrand Start time of mea-surement:13thstrand 14thstrand 15thstrand End time of measu-rement:16thstrand 17thstrand 18thstrand Operator:19thstrand 20thstrand Measurements with an accuracy of 0,1 mm.Commen
40、ts:6 ISO 2012 Tous droits rservsBS ISO 20193:2012ISO 20193:2012(E)Bibliography1 ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results Part 1: General principles and definitions2 ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic
41、method for the determination of the repeatability and reproducibility of a standard measurement method ISO 2012 Tous droits rservs 7BS ISO 20193:2012ISO 20193:2012(E) ISO 2012 Tous droits rservsICS 65.160Prix bas sur 7 pagesThis page deliberately left blankBSI is the independent national body respon
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