At present, masks have become an indispensable product in the field of sanitation and epidemic prevention and in the daily life of the public, and their quality is critical to the overall situation of public health and epidemic prevention. Not long ago, the Hubei Provincial Market Supervision Administration announced the announcement of two companies recalling 7,000 packs of disposable protective masks. It is reported that since May last year, 82 companies in 16 provinces across the country have successively announced the recall of more than 3.6 million problematic masks. The main problem is that the filtration efficiency is not up to standard, the protective effect of blocking droplets is reduced, and the bacteria, viruses and other aerosols are filtered. The ability of the company is affected, and there may be certain safety risks. In addition, many of these problematic masks that have entered the market have been put into use and cannot be recalled and replaced. In addition to the major hidden dangers to users' breathing safety caused by substandard masks, the difficulty of implementing the recall system for problem masks has also increased related risks. In actual operation, it is not easy to recall problem masks, and many of them cannot even be recalled.
Experts pointed out that different types of masks have different requirements for filtration efficiency. Particle filtration efficiency and bacterial filtration efficiency are the two main indicators of whether my country's masks are qualified or not. According to the "Daily Protective Mask Technical Specification Requirements (GB/T32610-2016)", the filtration efficiency (salt medium) of the protective mask shall not be less than 90%. For the most widely used disposable medical masks, my country's "Disposable Medical Masks (YY/T0969-2013)" requires that the bacterial filtration efficiency should not be less than 95%.
Melt blown cloth is used in the filter layer in the middle of the mask, which is called the "heart" of the mask, which directly determines the filtering and protective performance of the mask. The production technology and quality control of some mask manufacturers are not good enough. Due to the hot market, the number of mask manufacturers increased sharply last year. When some new companies with no production experience purchase melt blown cloth, they mainly use mass per unit area (commonly known as gram weight) as the selection index, and often ignore the index of melt blown cloth filtration efficiency. .
In 2020, Jiangsu Fiber Inspection Bureau, together with a number of units, issued a group standard for polypropylene meltblown nonwovens for masks. The Guangdong Nonwovens Association has jointly formulated and released a number of meltblown nonwovens for protective masks. Group standards. Experts in the industry suggest that, referring to the group standards of Jiangsu and Guangdong, national standards for melt blown cloth for masks should be formulated as soon as possible, and the product classification, filtration efficiency, ventilation resistance, quality standards, product identification, testing methods, etc. of the melt blown cloth for masks should be clarified. Scientific and clear standards guide the high-quality development of mask manufacturers.
The Guangzhou Standard Particle Filtration Efficiency Tester (GB-KF30010) is used to test the particle filtration efficiency of daily protective masks and medical masks, and to determine the barrier performance of ordinary fabrics and medical protective masks to constant flow of airflow. Applicable to medical device inspection centers, safety protection inspection centers, labor protection inspection centers, drug inspection centers, disease prevention and control centers, textile inspection centers, hospitals, mask manufacturers, etc. Welcome to call us and contact us at 18825066456.
