Research on Methods of Enhancing Filtering Efficiency of Medical Protective Clothing without Rubber Strips during Period of Prevention and Control of COVID-19 Epidemic/ 新型冠状病毒肺炎防控期间无胶条防护服过滤效率增强改造方法的研究

OBJECTIVE To upgrade a disposal protective clothing without rubber strips to a medical protective: clothing meeting the national standard requirements by exploring an approach to enhance filtering efficiency so as to be used as an alternative for urgent need when medical protective clothing with rubber strips are out of supply METHODS Firstly, the improvement points were defined by studying the national standard' Technical Requirements for Single-use Protective Clothing for Medical Use (GB19082-2009)' and comparing the most common pro-conducted to retrofit protective clothing without rubber strips with 3 different methods, the filtering efficiencies were tested by using specialized devices and normative test methods, the optimal retrofitting method was chosen to retrofit the protective clothing without rubber strips in batch and try them on, and a wearing simulation experiment was designed to test the effect of the retrofitted clothing RESULTS The filtering efficiencies of the tested parts of the protective clothing that were retrofitted by all the three methods were no less than 79 90%, the method of sealing the seams on the outside with BOPP sealing tape performed best and reached a filtering efficiency no less than 91 83%;this method was employed to retrofit 200 protective clothing, the result of the wearing simulation experiment showed that the filtering efficiencies of the critical parts such as fabric, seams and zippers were no less than 76 20% before the wearing, no less than 73 33% after the wearing CONCLUSION A method to retrofit the protective clothing has been explored: Sealing seams with BOPP sealing tape on the outside, adding double sided adhesive tape on the zipper flap, and adding neck flap The filtering efficiency of the protective clothing retrofitted with the method is significantly improved and meets the national standard requirements, therefore, the retrofitted clothing can be used as an alternative for urgent need