回复 6楼66的帖子 皱巴而且表面积变小了,但是filtration变高了啊, 从56%变成了77% https://www.cdc.gov/mmwr/volumes/70/wr/mm7007e1.htm Results from the first experiment demonstrated that the unknotted medical procedure mask alone blocked 56.1% of the particles from a simulated cough (standard deviation [SD] =5.8), and the cloth mask alone blocked 51.4% (SD = 7.1). The combination of the cloth mask covering the medical procedure mask (double mask) blocked 85.4% of the cough particles (SD = 2.4), and the knotted and tucked medical procedure mask blocked 77.0% (SD = 3.1).
以下第一个是正确示范,第二个是错误的 (一边折好了,一边还是有个大洞漏风)
我学着折了下。第一次用的口罩四层的太厚了,怎么也搞不好。第二次换了个普通surgical口罩,一下就折好了
折成功的样子:
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https://www.youtube.com/embed/0HkKetIs5uY
折失败的样子 (注意最后他一边还是有洞)
https://www.southshorehealth.org/wellness/blog/how-knot-and-tuck-method-achieves-better-fitting-face-mask
这个视频短点,cdc示范
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https://www.youtube.com/embed/GzTAZDsNBe0
可以增加效果不少呢。。。看上去也不怪
对,是一样的,但是第二个人(link里那个男的)没弄好,还有个洞
皱巴而且表面积变小了,但是filtration变高了啊, 从56%变成了77%
https://www.cdc.gov/mmwr/volumes/70/wr/mm7007e1.htm
Results from the first experiment demonstrated that the unknotted medical procedure mask alone blocked 56.1% of the particles from a simulated cough (standard deviation [SD] =5.8), and the cloth mask alone blocked 51.4% (SD = 7.1). The combination of the cloth mask covering the medical procedure mask (double mask) blocked 85.4% of the cough particles (SD = 2.4), and the knotted and tucked medical procedure mask blocked 77.0% (SD = 3.1).
可以拿手把脸两边那里叠的部分按扁 (学第一个女的那样),就不太容易出来。你看她带完了挺贴脸的不太像会出来。不过我一次也就顶多带俩小时
或者可以在surgical上叠一个布口罩,fit也会变好,两边不漏风了
我上次观察了一下,脸上肉偏多的可能本来贴合的就好一点,漏的气少
感觉不会有多大作用,因为有太多层折缝,每个折缝间的空隙都不小,如果是硅胶材质的边缘会有用,因为折缝空隙可以压缩到很小
比不折多过滤些,但是surgical肯定不是100%的。室内要保险的话带kn95或者kf94,室外我就带折过的surgical
硅胶的我买过一两个,但是带一个小时就感觉有点闷了,一个小时以内去买个菜啥的还不错