头部特征和呼吸状态对平面口罩密合性能的影响

Effect of head characteristics and respiratory status on the sealing performance of flat face masks

密合性能是评价口罩安全性的重要指标,反映了口罩边缘与佩戴者面部的贴合程度。采用单因素变量法,探究头部尺寸、呼吸频率、呼吸流量和头部运动对口罩密合性能的影响。试验结果表明:头部尺寸、呼吸参数和头部运动对口罩的密合性能均有影响;头模尺寸为中号时,口罩的密合性能最优;在其他条件相同时,随着呼吸频率或呼吸流量的增加,口罩对不同尺寸头模的防护效果均呈上升趋势;静止时口罩的密合性能最好,说话时口罩的密合性能最差,点头、摇头时密合性能接近,但均比说话时好,略差于静止状态。

Sealing performance is an important indicator to evaluate the safety of the mask,which reflects how well the edge of the mask fits to the wearer's face.Using the single factor test,the effects of head size,respiratory rate,respiratory flow rate,and head movement on mask sealing performance are investigated.The experimental results show that head size,respiratory parameters,and head movement all have an impact on the sealing performance of masks;When the size of the head mold is medium,the sealing performance of the mask is optimal;When other conditions are the same,as the respiratory rate or flow rate increases,the protective effect of masks on different sizes of head molds shows an upward trend;The sealing performance of a mask is the best when stationary,but the sealing performance is the worst when speaking.The sealing performance is similar when nodding or shaking the head,but both are better than when speaking,slightly worse than when stationary.