ISO 20193:2019 pdf free
ISO 20193:2019 pdf free.Tobacco and tobacco products – Determination of the width of the strands of cut tobacco
For 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 (for example in pouch, bag, box or cigarette pack), the atmosphere for the preparation 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.
Calculate the arithmetic mean from the individual measurements and report to the nearest 0,1 mm and 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.
The difference between the mean of 20 measurements per holder, obtained within 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 laboratories 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.
An interlaboratory study involving 10 laboratories to determine the cut width yielded the values shown in Table 1 for the repeatability limit, r, and reproducibility limit, R, as well as for the standard deviations for repeatability and reproducibility, sr and SR (see References [1] and [2]). Samples were conditioned according to ISO 15592-2 prior measurement.
The collaborative study has shown that the variability between the lines of a same holder could be neglected compared with the variability between the strands. Measurement of 20 strands along a single line is then sufficient.ISO 20193 pdf free download.
