Many people may think that the front and back are the same, as long as they wear Yanshi. In fact, this is not the case. The front and back functions of disposable face mask china are different. Many masks use a three-layer design. The filter layer for filtering germs is located in the middle and the outer layer is a waterproof layer. The inside is a water-absorbing layer. If you wear it backwards, the water-absorbing layer will become a waterproof layer, and the waterproof layer will become a water-absorbing layer. This will cause the saliva to adhere to the surface of the mask, and the more it accumulates, it may wet the mask and make the mask lose is filtering function.
How to distinguish the front and back of the mask?
Disposable face mask manufacturer first teaches you to distinguish between upper and lower, "the one with the metal strip is on the top", because the metal strip can be used to adjust and fit the nose.
After the above is confirmed, let's judge which side is outside and which side is inside.
I have listed the characteristics of several common disposable masks, you can compare them to judge.
Judge by color
Generally, what we see is a blue medical surgical mask. The blue side is the outside, and the light (white) side is the inside (to the face).
Judge by printing
If there is a logo or brand name printed on the mask, it is easy to judge. The embossing of the logo or brand name is usually printed on the outside, and then you can know which side is outside by seeing whether the words are correct.
Judging by the direction of the folds
What if the mask you bought is pure white without any fonts? It's okay, we have another ultimate method of judgment: look at the direction of the folds!
There are two types of folds in the mask:
There is another type of mask that has four folds, which is better to judge. If you open it naturally, the middle one is convex, then this side is the outside. In fact , it's easy to understand when you think about it. This allows our mouth and nose to have a certain amount of space to breathe.
After spreading, the direction of the upper two folds is upward, and the direction of the lower two folds is downward .
We can see the mask manual of Japan's three-dimensional brand to understand:
The direction of the folds down is the outside:
Judge by metal bars
The protruding side of the metal strip is the outside:
The metal strip is relatively flat inside, which is also for the mask wearing experience:
to sum up
First, it can be judged by "color": "dark color is outside, light color is inside"; second, it can be judged by "printing", "printing is generally on the outside, and the words are positive."
If you buy a pure white mask without printing, you can judge by the "fold direction". If there are three folds, then the direction of the folds is down to the outside; if there are four folds, then the middle piece is convex outward after being stretched, which is the outside. In addition, after spreading, the direction of the top two folds is upward, and the direction of the bottom two folds is downward.
Finally, we can also distinguish the front and back through the "metal strip". The protruding side of the metal bar is the outside, and the flat side of the metal bar is the inside.