Abstract:
In order to promote the consistency and accuracy of the draw resistance of the same cigarette sample measured at different atmospheric pressures (800-992 hPa), the effects of atmospheric pressure on the air volume flows through the inlet end of the critical flow orifice (CFO) and the outlet end of the draw resistance standard during the calibration process of the cigarette draw resistance tester were analyzed. A calibration method for the draw resistance tester was established based on atmospheric pressure compensation, and the parameters of the model in the method were determined based on data fitting. The calibration model and the two-point calibration method were used to obtain the measured values of six draw resistance standards of different specifications under different atmospheric pressures. The results showed that: 1) The effect of atmospheric pressure on the measurement results of the draw resistance tester could be compensated by correcting the atmospheric pressure
P and the actual pressure drop
PD of the draw resistance standard in the measurement calibration process. 2) The air volume flow through the inlet end of CFO and the atmospheric pressure basically complied with the quadratic function relationship. 3) Compared with the two-point calibration method, the draw resistance obtained with the calibration model under different atmospheric pressures was more approximate to the standard pressure drop value (average relative error < 0.15%) and more consistent (coefficient of variation < 0.05%). This method provides a reference for improving the accuracy of draw resistance tester measurement results.