English
After working on personal protective equipment for a long time, frontline employees may find that they are not very concerned about how many words are written on the packaging. They care about three things: whether it feels stuffy, slippery, and whether it presses against the nose bridge. Fangdun made KN95 dust masks by repeatedly adjusting around these three things.
First, let's take a look at the structure: KN95 foldable masks have a common three-layer structure: the outer layer is made of non-woven fabric, which is used to block large particles of dust and keep the surface layer firm; The middle layer is a melt blown filter material, responsible for the filtration efficiency, in accordance with GB 2626-2019, with a filtration efficiency of not less than 95% for non oily particulate matter; The inner layer is a skin friendly non-woven fabric, and the layer that adheres to the face should be soft and moisture absorbing. Each layer has its own section, and if one layer is missing, the wearing experience will significantly decrease.
Let's talk about three pain points when wearing it: stuffiness, mainly due to respiratory resistance. As the density of the filter material increases, the resistance naturally increases. Fangdun's approach is to ensure that the filtration efficiency meets the standard, while also ensuring good breathability of the filter material, so that it will not be removed halfway during a shift; When feeling suffocated, remind the workers to temporarily remove it outdoors or in a well ventilated area to take a break. Slippery, most likely due to issues with the headband and fit; Adjust the elasticity of the headband and tighten the hook position, making it less likely to shift when moving materials with the head down. For heavy labor positions, it is recommended to use the headband type instead of the ear hanging type. Pressing the bridge of the nose, which comes from the fit between the nose clip and the bridge of the nose; The nose clip is made into a bendable metal strip, which can be pressed from the middle of the nose bridge to both sides with the fingertips of both hands. Do not use one finger to push it in place, and the glasses will not fog easily.
Replacement and storage: The filter material is damp, the face mask is deformed or damaged, there is a smell of odor, and the respiratory resistance has significantly increased. All four situations should be replaced with new ones. It is recommended to distribute dust masks according to shifts and not wear them continuously for several days. Do not hang it around your neck or stuff it into your pocket when storing, as squeezing and oil stains can affect the condition of the filter material.
On the supply side: Dust masks are mainly packaged independently, which is convenient for distribution according to shifts and can also reduce pollution during storage; The packaging is labeled with the execution standard, protection level, and batch number. The inspection report can be provided with the goods for the convenience of customers' warehouse acceptance and factory inspection for future reference. The dust concentration and oil composition vary under different working conditions, and the model can be matched according to the on-site situation, rather than just one specification.
