Selection Method of Dust-proof Masks for Manufacturers of Folding Masks

发布日期:2019-09-19 16:59
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The manufacturer of folding cover machine should select according to the concentration and toxicity of dust. According to GB/T 18664 "Selection, Use and Protection of Respiratory Protection Equipment", all dust-proof masks are used as half masks. They are suitable for environments where the concentration of harmful substances does not exceed 10 times the occupational exposure limit. Otherwise, comprehensive masks or respirators with higher protection level should be used. If particles are attributed to highly toxic substances, carcinogens and radioactivity, the highest filtering power level should be selected. If the particles contain oil, appropriate filtering data must be selected. If the particulate matter is needle like fibers, such as slag cotton, asbestos, glass fiber and so on, because the dust mask can not be cleaned, the sealing part of the mask is pasted on the fine fiber, which easily causes facial irritation and is not suitable for use.



"As for different types of masks, after studying their degree of protection, the authorities have assigned them a factor, the designated protection factor (APF), to assist us in selecting masks. "APF values specified by different countries or APF values of folding mask manufacturers are different, but the meaning is the same. For example, according to ANSIZ 88.2-1992, the protection factor of air filter half mask is 10, which means that when you wear half mask, it can help you reduce the concentration of harmful substances by 10 times. Similarly, the APF value of air filter type is 100, the air supply type is 1000, etc.


The purpose of wearing masks is to reduce the level of harmful substances in the working environment to the level allowed to be exposed (there are different rules for allowable concentrations of different substances in the regulations, refer to PEL values and TLV values in the United States, etc.). Therefore, before choosing a mask, the
manufacturer of folding mask machine should know the exposure value of harmful substances, the permissible value of harmful substances, oxygen concentration and so on, and then make an accurate choice according to the specific protection coefficient of each mask.
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