BS ISO 6565:2015 pdf download – Tobacco and tobacco products — Draw resistance of cigarettes and pressure drop of filter rods — Standard conditions and measurement

02-18-2022 comment

BS ISO 6565:2015 pdf download – Tobacco and tobacco products — Draw resistance of cigarettes and pressure drop of filter rods — Standard conditions and measurement.
4.1.3 Position The position of the test piece may be either horizontal or vertical, but products with cavities containing loose-fill material shall be positioned vertically. 4.2 Conditions particular to cigarettes — Insertion of the test piece The output end of the test piece shall be inserted into a measurement device encapsulated to a depth of approximately 9 mm. NOTE The intention is to achieve a good seal while not occluding any ventilation holes. 4.3 Conditions particular to filter rods — Encapsulation The test piece shall be completely encapsulated in a measuring device so that no air can pass through the filter rod wrapping. 5 Instrument calibration The instrument shall be calibrated before normal testing using transfer standards. This shall be done at least once per day. The calibration shall be carried out in accordance with the instrument manufacturer’s instructions. The instrument shall be recalibrated if the atmospheric conditions change by more than 2 °C for temperature, or by more than 5 % for relative humidity. Each calibration of the instrument shall be recorded for later reference. NOTE 1 To obtain the best accuracy, calibrate the instrument as close as possible to its full-scale deflection or at the maximum point of the range of values of the products to be tested. To check for air leaks that might have occurred during the calibration and to check the linearity of the measuring system, at least one intermediate value pressure drop standard should be used in order to obtain a mid-scale value. NOTE 2 In addition to the mid-scale value, a calibration check can be made with a pressure drop standard that has a nominal pressure drop value close to the draw resistance or pressure drop of the test pieces to be measured.
6.3 Conditions particular to pressure instruments (for filter rods only) Determine the required settling time depending on the draw resistance of the test piece and the type of instrument. The reading for pressure drop shall be recorded at a constant time after the insertion of the test piece. For the particular conditions described in 6.2 and 6.3, practice has shown that for low draw resistance or pressure drop, i.e. below 2 000 Pa (or about 200 mmWG), a settling time of 2 s to 3 s is sufficient, while for higher draw resistances or pressure drop, i.e. above 4 000 Pa (or about 400 mmWG), a settling time of 4 s to 6 s is required. 7 Expression of results The expression of the laboratory results depends on the purpose for which the data are required and the level of laboratory precision. Express the results as follows: — individual draw resistance or pressure drop of a test piece, rounded to the nearest 10 Pa (or to the nearest 1 mmWG); — average and standard deviation of the draw resistance or pressure drop of a sample, rounded to the nearest 1 Pa (or to the nearest 0,1 mmWG). 8 Precision 8.1 Interlaboratory test Details of an interlaboratory test on the precision of the method are summarized in Annex B. The values derived from this interlaboratory test might not be applicable to values and matrices other than those given. 8.2 Repeatability The absolute difference between two independent single results, obtained using the same method on identical test material in the same laboratory by the same operator using the same equipment within a short interval of time will, in not more than 5 % of cases, be greater than the values given in Table 1 for cigarettes and Table 2 for filter rods.

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