Interpretation of key quality indicators of masks (3)-nose clips
Interpretation of key quality indicators of masks (3)-nose clipsRegarding masks, the demand during the recent epidemic has risen sharply, and the phenomenon of "a mask is hard to find" has appeared. However, some people who have not used masks often do not understand the role of nose clips in masks and the correct way to wear them. So is there a requirement for nose clips in all current mask standards? What are the specific requirements for nose clips in masks? Now, let us further understand the relevant indicators of the nose clip in the lower mask through the standard.
1. Nose clip index in different mask standards
It can be seen from Table 1 that "Guidelines for the Production of Emergency Protective Civil Masks in Zhejiang Province", YY / T 0969, YY 0469, and GB 19083 stipulate that nose masks should be required in masks, but the specific requirements are expressed differently, such as nose clip Made of plastic material, the length of the nose clip should not be less than 8.0cm, etc. GB / T 32610 does not specify the nose clip, but the basic requirements specify that the mask should be able to protect the mouth and nose safely and firmly.
2. How does the nose clip work?
The YY / T 0969 standard states: "The nose clip is made of a plastic material and is adjustable." This requirement is to make the mask and the face fit more closely. The plastic material of the nose clip allows the gas absorbed by the body to be filtered through the mask, instead of directly entering the body from the nose clip, thereby improving the safety factor. The YY 0469 standard states: "The length of the nose clip should not be less than 8.0cm." This is because everyone's face size and nose size are different. Too short nose clips may cause a decrease in safety factor.
3. How to use nose clip
Finally, let's take a look at the correct way to wear masks (ear straps) and nose clips.
Step 1: Facing the light side of the mask, pull one ear strap with each hand so that the nose clip is above the mask.
Step 2: Put your mask on your chin.
Step 3: After pulling the ear strap to the ear, adjust the ear strap to feel as comfortable as possible.
Step 4: Place the fingers of both hands in the middle of the metal nose clip and move the fingertips along the nose clip to both sides while pressing inwards until the nose clip is fully pressed into the shape of the bridge of the nose. Pinching the mask nose clip with only one hand may affect the tightness of the mask.
Step 5: Before entering the environment, the user must check the tightness of the mask and face.
Step 6: Inhale quickly. If air leaks from the bridge of the nose, the nose clip should be readjusted according to step 4; if air leaks from the edge of the mask, the ear strap should be readjusted; if a good fit cannot be obtained, steps 1-4 should be repeated.
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