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Evaluation of filtration effectiveness of various types of facemasks following with different sterilization methods
Journal of Industrial Textiles ( IF 3.2 ) Pub Date : 2021-07-04 , DOI: 10.1177/15280837211028794
Amit Kumar 1 , Basundhara Bhattacharjee 2 , DN Sangeetha 1 , V Subramanian 1 , B Venkatraman 1
Affiliation  

Due to the ongoing pandemic, various types of facemasks such as certified N-95, non-woven fiber and fabric/textile masks are being used as an essential protective measure to reduce the risk of spread of the SARS-Cov-2 virus. The aerosols size-dependent filtration efficiency and breathing resistance of these masks were tested before and after sterilization by five different methods for two flow rates (20 and 90 L/min) conditions corresponding to regular breathing rate and moderate/strenuous exertion, in the particle size range 0.3–10 µm. Sterilization techniques used here are autoclaving (30 and 60 minutes), dry air oven heating (30 and 60 minutes), ionizing irradiation (15 and 25 kGy), hot water washing with and without detergent and immersing in a 10% concentration of liquid hydrogen peroxide for 30 minutes. Further, the filtration efficiency of each type of masks is also studied with laboratory generated two-order higher aerosol concertation. The certified mask has the most outstanding filtering efficiency among all the other type of facemasks. The ionizing radiation causes a significant reduction in filtration efficacy, so that it is not recommended for sterilization purpose. The best method to sterilize certified N-95 masks without affecting their performance is by using dry air heating with temperature ranging from 70–80 °C. The performance of the cloth and surgical masks is found to be comparable for both flow conditions. As an affordable sterilization method, hot water washing is recommended, which does not deteriorate the fabric masks efficiency and can be used by the common people. The recommended masks for the general people are textile/fabric masks which serves fit for the purpose than non-woven masks because it can help to reduce non-biodegradable waste (facemask) and prevent respiratory droplet transmission. The non-woven mask can be sterilized with dry heat, hot water wash and autoclave.



中文翻译:

不同消毒方式对各类口罩过滤效果的评价

由于持续的大流行,各种类型的口罩,例如经过认证的 N-95、无纺纤维和织物/纺织口罩,正被用作减少 SARS-Cov-2 病毒传播风险的必要保护措施。通过五种不同的方法在两种流速(20 和 90 L/min)条件下,分别对应于常规呼吸频率和中等/剧烈运动,在颗粒中通过五种不同的方法对这些口罩的气溶胶大小相关的过滤效率和呼吸阻力进行了测试尺寸范围 0.3–10 µm。此处使用的灭菌技术包括高压灭菌(30 和 60 分钟)、干燥空气烘箱加热(30 和 60 分钟)、电离辐射(15 和 25 kGy)、使用或不使用洗涤剂的热水洗涤以及浸入 10% 浓度的液氢中过氧化氢 30 分钟。更多,还通过实验室产生的二阶更高气溶胶协同研究了每种口罩的过滤效率。经认证的口罩在所有其他类型的口罩中过滤效率最高。电离辐射会导致过滤效率显着降低,因此不推荐用于灭菌目的。在不影响其性能的情况下对经过认证的 N-95 口罩进行消毒的最佳方法是使用温度范围为 70–80 °C 的干燥空气加热。发现布口罩和外科口罩的性能在两种流动条件下都具有可比性。作为一种经济实惠的杀菌方式,推荐使用热水洗涤,既不会降低织物口罩的使用效率,普通人也可以使用。推荐给一般人的口罩是纺织/织物口罩,它比无纺布口罩更适合,因为它可以帮助减少不可生物降解的废物(面罩)并防止呼吸道飞沫传播。无纺布口罩可以干热、热水洗涤和高压灭菌。

更新日期:2021-07-05
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