How many layers does the Kn95 mask have?

How many layers does the Kn95 mask have?

Regular KN95 mask, you can see that this mask is composed of five layers:
1. The outermost layer is a non-woven fabric with a waterproof treatment, which is mainly used to isolate the liquid sprayed by the patient and has the effect of preventing spray.

2. The second layer is hot air cotton, which mainly plays the role of heat insulation, moisture and moisture resistance, and improves the wearer's comfort.

3. The third and fourth layers are two layers of melt-blown cloth after electret treatment. High-quality KN95 masks generally use two layers of melt-blown cloth weighing more than 25 grams to ensure that bacterial suspended particles can be basically filtered, which is the most serious. The core layer.

4. The innermost layer is soft skin-friendly non-woven fabric, which is non-allergenic and improves the comfort of the wearer.

What is meltblown cloth:

Meltblown cloth is a film made of polypropylene with a high melt index. It is a film composed of many crisscross fibers stacked in random directions. The special fiber diameter ranges from 0.5 to 10 microns, and the fiber diameter is about thirty One in one. An ordinary medical mask needs 1g meltblown cloth + 2g spunbond cloth; a N95 mask needs 3-4g meltblown cloth + 4g spunbond cloth.