BS ISO 20193:2019 pdf free.Tobacco and tobacco product – Determination of the width of the strands of cut tobacco.
BS ISO 20193 1 Scope This document specifies a method for the determination of the width of strands of cut tobacco. This method is only applicable on samples of strands of cut tobacco with a uniform cut width.NOTE There are 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 or a camera with image processing system. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, 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 direction ISO 3402, Tobacco and tobacco products – – Atmosphere for conditioning and testing ISO 8243, Cigarettes一Sampling ISO 15592-1, Fine-cut tobacco and smoking articles made from it一Methods of sampling, conditioning and analysis一Part 1: Sampling ISO 15592-2, Fine-cut tobacco and smoking articles made from it一Methods of sampling, conditioning and analysis一Part 2: Atmosphere for conditioning and testing 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, Sp and Sp (see References [1] and [2]). Samples were conditioned according to ISO 15592-2 prior measurement.BS ISO 20193 pdf download.