Classification of dust masks: According to its structur […]
Classification of dust masks:
According to its structure and working principle, it is divided into two categories: self-priming filter type and air supply type.
Self-priming filter type: the working principle of filter type mask for short is to make air containing harmful substances filter through the filter material of the mask and then be inhaled by people; the structure of self-priming filter type dust mask is divided into two parts: one is the face mask The mask, we can simply understand that it is a mask shelf; the other is the filter material part, including dust-proof filter cotton and anti-virus chemical filter box.
Self-priming filter dust masks include many types:
Half face type: a mask that only covers the respiratory organs (mouth and nose);
Comprehensive type: the mask can cover the entire face including the eyes;
Electric air supply type: It is driven by a battery and a motor to draw air containing harmful substances into the filter material for human breathing.
Air supply type: It refers to the clean air source isolated from harmful substances, which is sent to the face of a person through a tube and a mask through a power action such as an air compressor, a compressed gas cylinder device, etc. for human breathing.
The maintenance method of dust masks
1. When the mask is not worn, it should be folded and put into a clean envelope, and the side close to the nose and mouth should be folded inward. Don't just put it in your pocket or hang it around your neck.
2. Dust masks should be cleaned and disinfected every day. Both gauze masks and air filter masks can be disinfected by heating.
The specific approach is:
First rub the gauze mask gently with warm water and soap. The bowl-shaped mask can be gently cleaned with a soft brush dipped in detergent, and then rinsed with clean water. Please be careful not to rub it hard, because if the warp and weft gap of the gauze is too large, it will lose its anti-dropping effect.
Soak the cleaned mask in a 2% peracetic acid solution for 30 minutes or boil it in boiling water for 20 minutes or steam it in a steamer for 15 minutes, and then dry it for later use. This method is suitable for gauze masks and bowl-shaped masks.
Before using again, you should carefully check whether the masks and face shields are still in good condition. For gauze masks and face shields, you can take the light transmission method, that is, take the light in front of the lamp to see if there are obvious light spots. The middle part and the edge part are transparent. Is the rate consistent? If in doubt, replace it with a new one.