Analysis of your Influence of Air flow Flow on the Detection of Mask Particle Filter Performance

 【Summary】In watch of the trouble that the main difference in particle filtration efficiency check results of mask goods because of the implementation of various product or service criteria and detection strategies can not be objectively in comparison, the test disorders of different air flow flows are transformed to study the affect of ventilation stream around the detection of filtration efficiency. Give ideas for the selection of masks below diverse utilization eventualities, plus the selection of merchandise normal technical indicators and testing parameters. 
[Search phrases] mask; filtration effectiveness; detection; ventilation circulation
0 Introduction 
China's protective mask goods could be divided into civilian masks and health care masks based on the area of use. Civil masks are additional divided into industrial dust-evidence and common protective masks according to their utilizes. According to the implementation requirements of products, These are divided into nationwide standards, marketplace expectations and team criteria. Precise merchandise implementation requirements mainly incorporate: "Technical Specs for Every day Protecting Masks ( GB/T 32610—2016 ", "Technical Specifications for youngsters's Masks ( GB/T 38880—2020 "), "Respiratory Safety Self-priming Filtered Particle Respirators ( GB 2626) —2019 》《 
Complex specifications for protective masks to be used ( GB 19083—2010 ", "Disposable health care masks ( YY/T 0969—2013 ", "Medical surgical masks ( YY 0469—2011) ", "Typical protective masks ( T/CTCA seven—2019) " [one] . 
Considering the fact that 2020 , the marketplace supervision and management Section has performed various solution quality supervision and place checks on China's mask goods. From the final results of your location checks, a person unqualified merchandise That always seems may be the particulate issue filtration effectiveness (hereinafter called the filtration performance), which exhibits the filtration efficiency. This is a critical parameter of mask items. Throughout the Investigation of the above criteria, it's identified the venture has the following features: ①The demands in the regular indicators are distinctive; ②The ventilation circulation conditions on the detection methods are diverse. This post takes salt particulate make any difference for instance to check the filtration performance examination final results underneath distinct ventilation circulation disorders. The next filtration efficiency refers to salt particulate issue circumstances. 
one Index needs and ventilation move ailments of recent relevant specifications one.1 Specialized index requirements of current pertinent expectations 
Take the filtration performance index of salt particulate matter as an example, the various standards mentioned previously mentioned 
From the criteria, the requirements for this project are various. One example is , the filtration efficiency of GB/T 32610-2016 is divided into 3 grades, and also the regular demands are certainly not below ninety% , 95% ninety nine% [two] , and the requirements from the GB 19083-2010 standard for this undertaking are divided into 3 amounts of no less than 95% , no under ninety nine% and no fewer than ninety nine.ninety seven% [3] YY 0469-2011 necessitates no under 30% [four] T/CTCA seven-2019 team regular requirements Is not fewer than eighty% [five] . It could be found that the requirements of existing domestic expectations for filtration performance are pretty unique. 
one.two The filtration performance detection strategy of the current appropriate benchmarks 
The take a look at methods of filtration efficiency quoted by the above-outlined standard goods predominantly include: GB/T 32610-2016 Appendix A , GB 19083-2010 Aspect 5.four , YY 0469-2011 Element 5.6.two, and GB 2626-2019 six.two details, unique comparison See Table 1 . 
It is usually seen from Table one that, except for the different specifications with the exam flow, the remainder of the disorders is often a similar. 
one.3 Result of aeration amount on the filtration effectiveness of the experimental layout effects in different efficiency requirements, managed ventilation needs and movement necessities of detection are various. Having said that, the filter layer of masks mainly employs meltblown non-woven fabrics as raw resources. At present, there is only the normal of FZ/T 64078-2019 . Thus, a similar Uncooked content can produce different types of mask products and solutions with various standards. The results measured below distinctive ventilation move detection problems cannot be objectively in comparison. In order to examine the affect in the air flow move detection results, the creator conducted the following experiments for Assessment. 
 
1 Comparison of take a look at disorders of each way of filtration efficiency 
GB/T 32610—2016 GB 19083—2010 YY 0469—2011 GB 2626—2019 
The concentration of salt particles doesn't exceed thirty mg/m 3 and doesn't exceed 200 mg/m 3 
Counting median diameter ( CMD ) ( 0.075±0.020 μm 
The geometric conventional deviation of particle measurement distribution is not really over one.86 
Test flow ( eighty five±4 L/min 85±2 L/min thirty±two L/min eighty five±4 L/min 245 
Extensive discourse 
The take a look at structure concept is as follows: use the same take a look at gear, in steady time 
Reduced CARBON Planet 2021/2 
3 Examination outcomes and Examination 
While in the area, another test ailments except for the ventilation circulation remained secure, as well as the filtration performance of healthcare masks and non-medical masks procured available was analyzed, and the information outcomes had been analyzed. 
two Assessments below unique ventilation stream ailments 
2.one Check materials 
 
Mask particle filtration efficiency and airflow resistance tester ( Design ZR-1006 , produced by Qingdao Zhongrui Clever Instrument Co., Ltd.); salt aerosol generator ( type ZR-1311 , made by Qingdao Zhongrui Smart Instrument Co., Ltd.); Clinical each day protecting mask (sample 1 ), the specification is ( fourteen.five×nine.5 cm ; flat disposable medical mask medical mask (sample two ), the specification is ( 17.5×nine.5 cm) . You will find fifty samples of two styles of masks , randomly chosen from Among the them select. 
two.2 Check circumstances 
In accordance with the design of the experiment, the variable situation would be the air flow circulation rate, as well as ranges stated in Desk 1 are picked : 30 L/min , 45 L/min , sixty L/min , 75 L/min , 85 L/min . The remaining circumstances make reference to the ailments listed in Table 1 : the saline Resolution is sodium chloride ( NaCl ) solution, the counting median diameter is a fixed parameter on the instrument, and the upstream particle concentration is selected as 30 mg/m 3 . The temperature of your test atmosphere is ( 25±5 ℃ , as well as the relative humidity is ( 30±10%) . The exam sample isn't issue to temperature and humidity pretreatment, and it can be placed from the check surroundings for two h prior to the check . 
Under typical instances, the salt particle filtration effectiveness examination price of just one sample exhibits an upward development with time throughout the check, and the result of a single sample is recorded in the minimal worth. Making sure that the sample is analyzed in time, the particle loading amount of money throughout the examination is selected at the conclusion of the timing. Influence the final result. 
two.three Examination treatment 
Activate and preheat according to the gear handbook and function instruction, add sodium chloride ( Na - Cl ) solution into the salt aerosol generator, alter the generator to create aerosol and provide it towards the tester. Work the tester for Original screening and modify the aerosol generator so that the upstream concentration reaches thirty mg/m three . 
Constantly take a look at The 2 mask samples, exam 5 samples less than Each individual circulation situation , and report the result of each sample and the normal price of the five samples. 2.4 Exam info 
Desk two demonstrates the examination results of the filtration efficiency of the two mask samples at five ventilation flows of 85 ~ thirty L/min . 
two Check results of filtration effectiveness of two mask samples 
Movement rate 85 L/min 75 L/min sixty L/min forty five L/min 30 L/min 55.01 sixty two.34 sixty two.47 65.02 73.24 
58.24 fifty nine.eighty three 61.eighty 70.seventy three sixty eight.39 
It might be viewed within the ends in Desk two which the two mask samples display which the decreased the air flow flow, the upper the filtration efficiency result. 
Sample 1 is usually a flat non-health care mask. Within this take a look at, the minimum value elevated from fifty four.08% underneath 85 L/min ailments to sixty eight.39% beneath 30 L/min circumstances, an improve of somewhere around 14.three% ; the common worth was fifty six.forty seven% Amplified to 71.40% , a rise of about 14.9% . Sample 2 is often a flat health-related mask. During this exam, the least benefit elevated from 81.48% under the situation of eighty five L/min to ninety.thirty% underneath the ailment of thirty L/min , an raise of about eight.8% ; the normal worth was amplified from 82.49% To ninety two.02% , a rise of about nine.5% . 
The research on use properties for our wholesome population Vitality [six] twenty ~ fifty nine resting several years adult respiratory air flow number of 7.28 ~ nine.ninety four L / min , and tested populations respiratory air flow broadcast gymnastics within the 21.fifty two - 33.forty four L/min . A study showed that the respiratory ventilation quantity of balanced persons during radio Get more information gymnastics and other types of ordinary routines did not exceed 34 L/min , which was Considerably reduced than the experimental air flow volume beneath the affliction of 85 L/min . In the case of extreme physical exercise, the air flow volume of the gang is 8 periods that within the relaxed point out , that is definitely, underneath Severe ailments, it may possibly reach eighty five L/min . 
It may be observed from the above mentioned which the ventilation stream disorders during the test do Possess a greater effect on the effects. When adopting 85 L/min detection ailments, the requirements for filtration effectiveness objects are stricter than the strategy working with 30 L/min ailments. 
four summary 
Once the consumer is resting or doing modest functions, the actual filtering effect in the mask worn via the person are going to be enhanced because the worth of the respiratory air flow is considerably less, and the skilled item Along with the very low air flow movement detection affliction of your YY 0469-2011 system may be selected. ; Once the user engages in actions with greater depth outdoors, the respiratory ventilation will boost substantially, and capable products with substantial air flow move screening problems which include GB/T 32610-2016 must be chosen . When formulating the technological indicators or testing methods of the job, this aspect can also be taken into consideration, and acceptable parameters might be selected based on the purpose on the mask.