The three principles of choice of masks

First, the dust blocking efficiency of masks. The dust-blocking efficiency of masks is based on their barrier efficiency to fine dust, especially to respiratory fines less than 5 microns. Because this particle size dust can directly enter the alveoli, it has the greatest impact on human health. In general gauze masks , the principle of blocking dust is mechanical filtering. When dust collides with gauze, it is blocked by layers and blocks some large particles of dust in the sand cloth. However, some fine dust, especially dust less than 5 microns, will pass through the gauze mesh and enter the respiratory system. There are some dust masks in foreign countries. The filter material consists of fibers filled with permanent static electricity. Respirable dusts smaller than 5 μm are attracted by electrostatic attraction during the process of passing through the filter material and are absorbed by the filter material. Dust really plays a role in blocking dust.

Second, the degree of closeness of the mask and the shape of the human face. The air is like a stream of water, where the resistance is small and where it flows first. When the shape of the mask is not close to the human face, dangerous substances in the air will leak into the respiratory tract. Well, even if you choose the best mask for the filter, it will not protect your health. Now many foreign regulations and standards stipulate that workers should regularly perform masks adhesion tests. The purpose is to ensure that workers choose the right masks and wear the masks in the right steps.

Third, wear comfortable. Respiratory resistance is required to be small, weight should be light, wearing hygiene, and easy maintenance. In this way, workers will be willing to insist on wearing and improving their work efficiency in the workplace. The foreign maintenance-free masks do not require cleaning or replacement of parts. When the dust is saturated or the masks are damaged, they are discarded. This will not only ensure the hygiene of the masks, but also eliminate the time and effort of the workers to maintain the masks. In addition, many masks have an arched shape, which can ensure good adhesion to the shape of the face and can retain a certain amount of space at the mouth and nose, and is comfortable to wear.

This article is a reprint of online media. It only represents the author's point of view. It has nothing to do with this site. If news articles and comments infringe your legal rights, please call us and we will handle it in a timely manner.