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首页> 外文会议>16th Annual technical conference and exposition of the American Filtration and Separations Society >PROTECTION FACTOR AND FILTER EFFICIENCY INPROTECTIVE FACE MASKS
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PROTECTION FACTOR AND FILTER EFFICIENCY INPROTECTIVE FACE MASKS

机译：防护面膜和过滤效率防护面膜

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摘要

The laboratory protection factors required of commercially available full facepiecernprotective masks vary from under 1000 for civilian masks to over 10,000 for militaryrnmasks. Current trends in the military seek to increase this protection factor to well abovern100,000. That is, the mask, if properly designed, tested and fitted to the subject cannotrnallow more than 10 parts per million of the challenge concentration to reach the subject inrnorder to achieve a protection factor of 100,000.rnIt is well understood that defects in the components of a mask and /or a poor fit on thernsubject will lead to a poor Protection Factor. In a defect free mask, filter efficiency isrnarguably the most crucial variable besides face fit that will affect the ability of the maskrnto deliver the desired Protection Factor. However, as required Protection Factorsrnincrease, the relatively poor performance of a filter cartridge may hide defects in maskrncomponents, and hence could hide the source of a lower than expected Protection Factor.rnThis paper will examine the relationship between the maximum estimated protectionrnfactor and the rated filter efficiency. For example, HEPA filters with a rated efficiency ofrn99.97% (or 300 ppm), are used in masks that display protection factors in excess ofrn10,000 (100 ppm). The results relating filter efficiency, mask defects, and protectionrnfactor will be presented and may lead to improved mask specifications.
机译：市售的全面罩式防护口罩所需的实验室保护系数从民用口罩的1000以下到军用口罩的10,000以上不等。军事上的当前趋势试图将该保护系数提高到远超过100,000。就是说，如果对口罩进行了适当的设计，测试和安装，则其吞咽浓度不能超过百万分之十的攻击浓度，以达到无法达到100,000的保护系数的目的。戴上口罩和/或在对象上佩戴不当会导致保护系数差。在无缺陷的口罩中，除面部贴合性之外，过滤效率无疑是最关键的变量，这会影响口罩传递所需保护因子的能力。但是，随着保护因子的增加，相对较差的滤芯性能可能掩盖了掩膜组件中的缺陷，因此可能隐藏了低于预期保护因子的来源。本文将研究最大估计保护因子与额定滤波器之间的关系。效率。例如，额定保护率为rn99.97％（或300 ppm）的HEPA过滤器用于面罩，其保护系数超过rn10,000（100 ppm）。将介绍与滤波器效率，掩模缺陷和保护因子有关的结果，这些结果可能会改善掩模规格。

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