Industrial waste gas and construction site dust emissions remain high, resulting in air pollutants Concentration rises, haze pollution is serious, people’s health is Threat [1-2]. Therefore, civilian masks have become the simplest and most effective way to protect themselves. Method [3]. At present, the testing standards for mask performance at home and abroad mainly focus on Particle protection effect, leakage prevention and respiratory resistance [4]. Among them, Research on particle protection performance, filtration efficiency and leakage detection It has been relatively perfect [5-8]. In recent years, the breathing produced when wearing a mask Resistance has also received increasing attention. Researches on the performance of masks including breathing resistance testing methods have been widely carried out at home and abroad. Wang Xu et al. [9] used American TSI-8130 masks The filter test device performs a static test on the respiratory resistance and obtains the test When the flow rate is large, the filtration efficiency is low and the respiratory resistance is large, but it cannot be reversed Reflect the dynamics of the breathing resistance of the mask changing with the air flow. Xia Chan [10] Select several common masks for respiratory resistance test, and get this The breathing resistance and filtration efficiency of some masks cannot meet the requirements, but It does not consider the continuously changing breathing process when a person wears a mask. Domestic GK－ 1000 automatic filtration efficiency tester [11] can test the penetration of masks The resistance value is measured at the same time as the air rate value, but the exhalation process is not considered. country Respiratory resistance test standard of inner mask industry [12-16] and American standard NIOSH The test air flow in 42CFR part 84—1995 is stable flow. European standard EN 149-2001, BS EN 13274-3: 2001 and ISO 16900-2: 2009 is the static maximum resistance value, the evaluation refers to The standard is relatively single, and the respiratory resistance performance of the mask cannot be fully evaluated. and also Some domestic and foreign scholars use real people to measure the respiratory resistance of masks. Try [17-19], the measured data are all static indicators, and there is no continuous test. It can be seen that the current tests on the respiratory resistance of masks are mainly in Performed at a steady airflow speed, using two types Static indicators are used for characterization. The indicators are relatively single and cannot be comprehensively tested and evaluated. Respiratory resistance performance of the price mask. This article is based on previous research [20], the design And developed a dynamic objective test system, by changing the airflow direction And speed simulates the dynamic process of human continuous breathing, and collects breathing in real time The dynamic change of the resistance value in order to achieve an effective and comprehensive test and evaluation The dynamic characteristics of breathing resistance with a mask.
https://www.allcleanchina.com/
https://www.lifekeepup.com/collections/wet-wipes
A dynamic measurement system for respiratory resistance of civil masks
(1 post) (1 voice)-
Posted 1 month ago #
Reply
You must log in to post.