Generally speaking, the mask is a 3-layer structure, which is spunbond nonwoven(s) + meltblown nonwoven(M) + spunbond nonwoven(S), i.e. SMS structure. The outer layer is spunbond nonwoven with water-blocking effect, which can prevent droplets from entering the mask; the inner layer is nonwoven with softer material, which has moisture-absorbing effect and can discharge moisture from the mouth. The main part of the filtering effect is the middle layer of extremely fine and electrostatic meltblown nonwoven, the main material is high melt finger polypropylene, after electrostatic standing polarity treatment to achieve the standard required filtration efficiency.
The influence of the mask fixation method on the breathing resistance test
In GB/T 32610-2016 "technical specification of daily protective masks" in the inspiratory resistance, expiratory resistance test method, the mask in the test should be adjusted to wear position of the mask and headband tightness, to ensure that the mask and the test head mold of the tight fit. In the actual test found that the exhalation, suction resistance test value by the mask with the degree of tightness, the material of the nasal strip, head mold and mask fit, testers operating differences and other factors have a greater impact. Through the comparison study between different testing organizations, it was found that different fixation methods have a greater impact on the test results.
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