Evaluation with the Impact of Ventilation Stream to the Detection of Mask Particle Filter Effectiveness

 【Abstract】In watch of the issue that the difference in particle filtration performance examination outcomes of mask products due to implementation of different merchandise requirements and detection procedures cannot be objectively when compared, the test ailments of different ventilation flows are improved to review the affect of ventilation stream on the detection of filtration efficiency. Give solutions for the selection of masks below diverse use eventualities, as well as the collection of product or service standard technical indicators and testing parameters. 
[Key phrases] mask; filtration effectiveness; detection; ventilation circulation
0 Introduction 
China's protective mask merchandise is often divided into civilian masks and professional medical masks in accordance with the field of use. Civil masks are further divided into industrial dust-proof and ordinary protecting masks according to their utilizes. Based on the implementation specifications of solutions, They may be divided into countrywide requirements, field requirements and group standards. Certain products implementation expectations predominantly contain: "Specialized Requirements for Day by day Protective Masks ( GB/T 32610—2016 ", "Technological Specifications for youngsters's Masks ( GB/T 38880—2020 "), "Respiratory Security Self-priming Filtered Particle Respirators ( GB 2626) —2019 》《 
Specialized needs for protecting masks to be used ( GB 19083—2010 ", "Disposable professional medical masks ( YY/T 0969—2013 ", "Healthcare surgical masks ( YY 0469—2011) ", "Standard protecting masks ( T/CTCA seven—2019) " [one] . 
Because 2020 , the market supervision and administration department has carried out several item quality supervision and spot checks on China's mask merchandise. From the results of your place checks, a person unqualified merchandise that often seems could be the particulate make any difference filtration effectiveness (hereinafter called the filtration efficiency), which reveals the filtration efficiency. It's really a vital parameter of mask goods. Through the Investigation of the above standards, it is actually observed that the challenge has the following features: ①The needs of your normal indicators are distinctive; ②The air flow circulation situations from the detection methods are distinctive. This article usually takes salt particulate subject as an example to study the filtration efficiency check benefits less than diverse air flow flow ailments. The following filtration effectiveness refers to salt particulate make any difference problems. 
1 Index needs and air flow move situations of present-day relevant expectations one.one Complex index prerequisites of latest appropriate standards 
Go ahead and take filtration efficiency index of salt particulate issue as an example, the numerous expectations pointed out previously mentioned 
Within the specifications, the necessities for this project are distinct. One example is , the filtration efficiency of GB/T 32610-2016 is divided into 3 grades, and also the normal needs will not be fewer than ninety% , 95% ninety nine% [two] , and the requirements from the GB 19083-2010 conventional for this venture are divided into Three amounts of no lower than 95% , no below ninety nine% and no less than ninety nine.97% [3] YY 0469-2011 demands no lower than thirty% [4] T/CTCA seven-2019 group conventional needs Is not lower than 80% [five] . It can be observed that the requirements of recent domestic expectations for filtration effectiveness are rather diverse. 
one.2 The filtration effectiveness detection approach of the current appropriate requirements 
The check methods of filtration performance quoted by the above mentioned-stated regular goods predominantly incorporate: GB/T 32610-2016 Appendix A , GB 19083-2010 Element five.4 , YY 0469-2011 Section 5.six.2, and GB 2626-2019 6.two points, certain comparison See Desk one . 
It may be witnessed from Desk one that, except for the various prerequisites for the examination stream, the remainder of the circumstances might be the same. 
1.3 Influence of aeration rate within the filtration effectiveness with the experimental design final results in several general performance requirements, controlled ventilation needs and circulation demands of detection are unique. Having said that, the filter layer of masks mostly utilizes meltblown non-woven fabrics as raw supplies. At present, There is certainly only the normal of FZ/T 64078-2019 . For that reason, the exact same Uncooked substance can develop differing types of mask solutions with unique criteria. The final results calculated below various ventilation move detection disorders can not be objectively when compared. So as to analyze the impact of the air flow circulation detection final results, the author done the subsequent experiments for Examination. 
 
1 Comparison of exam ailments of every method of filtration performance 
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 does not exceed two hundred mg/m 3 
Counting median diameter ( CMD ) ( 0.075±0.020 μm 
The geometric conventional deviation of particle measurement distribution isn't more than one.86 
Test stream ( 85±four L/min 85±two L/min 30±two L/min eighty five±4 L/min 245 
Comprehensive discourse 
The take a look at style strategy is as follows: use precisely the same test devices, in constant time 
LOW CARBON Entire world 2021/two 
3 Exam benefits and analysis 
While in the section, the opposite test problems aside from the ventilation stream remained secure, as well as the filtration performance of healthcare masks and non-clinical masks bought available was tested, and the data effects were analyzed. 
2 Exams underneath different ventilation circulation ailments 
two.one Test components 
 
Mask particle filtration performance and airflow resistance tester ( Product ZR-1006 , made by Qingdao Zhongrui Intelligent Instrument Co., Ltd.); salt aerosol generator ( kind ZR-1311 , produced by Qingdao Zhongrui Smart Instrument Co., Ltd.); Professional medical daily protective mask (sample 1 ), the specification is ( 14.5×9.5 cm ; flat disposable health-related mask professional medical mask (sample two ), the specification is ( 17.five×nine.five cm) . You will find 50 samples of two types of masks , randomly chosen from Amid them decide on. 
two.two Take a look at ailments 
In accordance with the structure of the experiment, the variable condition will be the ventilation flow rate, and also the ranges outlined in Table 1 are picked : thirty L/min , 45 L/min , 60 L/min , 75 L/min , eighty five L/min . The remaining disorders check with the disorders mentioned in Desk 1 : the saline Remedy is sodium chloride ( NaCl ) Answer, the counting median diameter is a fixed parameter of your instrument, as well as upstream particle focus is selected as 30 mg/m three . The temperature on the examination atmosphere is ( 25±five ℃ , plus the relative humidity is ( 30±10%) . The exam sample will not be matter to temperature and humidity pretreatment, and it really is placed during the take a look at surroundings for 2 h prior to the check . 
Less than usual conditions, the salt particle filtration efficiency take a look at worth of a single sample demonstrates an upward pattern with time in the take a look at, and the result of one sample is recorded on the minimum amount price. To make certain that the sample is analyzed in time, the particle loading sum in the examination is chosen at the end of the timing. Have an affect on the final consequence. 
2.3 Exam method 
Activate and preheat according to the products handbook and perform instruction, insert sodium chloride ( Na - Cl ) Answer to your salt aerosol generator, adjust the generator to create aerosol and deliver it to your tester. Operate the tester for Preliminary screening and adjust the aerosol generator so that the upstream concentration reaches thirty mg/m three . 
Constantly examination The 2 mask samples, exam 5 samples beneath Each individual flow problem , and report the results of each sample and the common worth of the five samples. two.four Exam data 
Table 2 displays the take a look at success from the filtration efficiency in the two mask samples at 5 ventilation flows of 85 ~ 30 L/min . 
2 Examination benefits of filtration effectiveness of two mask samples 
Stream rate eighty five L/min seventy five L/min sixty L/min forty five L/min thirty L/min 55.01 sixty two.34 sixty two.47 65.02 73.24 
58.24 fifty nine.eighty three 61.80 70.73 68.39 
It can be noticed from your leads to Table two which the two mask samples clearly show which the lessen the air flow stream, the higher the filtration efficiency Hey outcome. 
Sample 1 is a flat non-medical mask. In this test, the minimum amount benefit amplified from fifty four.08% beneath 85 L/min conditions to sixty eight.39% underneath 30 L/min circumstances, an increase of approximately fourteen.3% ; the average benefit was fifty six.47% Increased to seventy one.40% , a boost of about fourteen.9% . Sample two can be a flat health-related mask. Within this exam, the least worth amplified from eighty one.48% beneath the problem of eighty five L/min to 90.30% underneath the issue of 30 L/min , an maximize of about 8.eight% ; the common benefit was enhanced from eighty two.49% To ninety two.02% , an increase of about nine.5% . 
The review on consumption properties for our healthier population Electricity [6] 20 ~ fifty nine resting a long time Grownup respiratory ventilation volume of seven.28 ~ 9.ninety four L / min , and tested populations respiratory ventilation broadcast gymnastics during the 21.52 - 33.forty four L/min . A study showed which the respiratory ventilation volume of balanced folks all through radio gymnastics and other kinds of standard workouts didn't exceed 34 L/min , which was A great deal reduced than the experimental air flow quantity under the issue of eighty five L/min . In the situation of intense exercising, the air flow quantity of the crowd is 8 moments that during the relaxed condition , that is definitely, under Excessive conditions, it may access eighty five L/min . 
It might be noticed from the above that the ventilation circulation ailments in the test do Possess a better effect on the final results. When adopting eighty five L/min detection ailments, the necessities for filtration performance merchandise are stricter than the tactic applying thirty L/min ailments. 
four summary 
If the consumer is resting or carrying out modest pursuits, the actual filtering impact in the mask worn through the user will probably be improved as the price of the respiratory air flow is significantly less, and the competent solution With all the reduced ventilation move detection affliction with the YY 0469-2011 strategy could be selected. ; In the event the consumer engages in routines with higher depth outside, the respiratory ventilation will maximize appreciably, and experienced items with higher air flow circulation testing ailments for example GB/T 32610-2016 ought to be picked . When formulating the specialized indicators or tests methods of the project, this component may also be taken into account, and ideal parameters could be picked according to the goal with the mask.