Analysis of unqualified items 1. Filtration efficiency […]
Analysis of unqualified items
1. Filtration efficiency
Filtration efficiency reflects the product's ability to block particles. According to different product standards, testing the product's ability to filter microparticles or bacterial particle aerosols is the most important quality indicator for protective masks. If the quality of the filter material used is poor, the production parameters are unreasonable, or the electrostatic electret treatment is not carried out properly, and the filtration index requirements of the specified standard are not met, the product filtration efficiency project test will be unqualified.
2. The breaking strength of the mask belt and the connection between the mask belt and the mask body
The mask strap is a rope strap that fixes the mask on the head. It mainly evaluates the breaking strength of the mask strap and the connection between the mask strap and the mask body. If the mask strap or the connection between the mask strap and the mask body is of poor quality, the product will not be worn and the product will be lost. Use performance. If the heat pressure parameters such as temperature, pressure, and time are unreasonable, it may result in insufficient bonding strength between the mask tape and the mask body, or the bonding material may become brittle when heated, and separate or break during the test, which does not meet the standard requirements.
3. Protection effect
The protective effect is a special item of GB/T 32610-2016 "Technical Specification for Daily Protective Masks". It evaluates the filtering ability of the product when it is worn on the head mold. It not only evaluates the filtering performance of the product filter material, but also evaluates the structure of the mask product. To meet the filtration requirements, if the product filter material cannot effectively filter particulates, or the mask cannot be closely attached to the human face after wearing, or there is a partial air leakage defect, the product's protective effect will be unqualified.
4. Ventilation resistance (inspiratory resistance, exhalation resistance)
Ventilation resistance (inspiration resistance, exhalation resistance) reflects the breathability of the mask product. Excessive ventilation resistance means that the product has poor air permeability and is uncomfortable to wear. Wearing for a long time may even cause damage to the human heart and lungs. Children and poor cardiopulmonary function The crowd should pay more attention to the breathability of masks. The unqualified ventilation resistance (inspiratory resistance, exhalation resistance) is mainly due to the fact that the company has adopted too dense, thick, and poorly air-permeable filter materials in pursuit of the filtering performance of the mask. The ventilation resistance and the filtration efficiency often have a corresponding relationship, which improves Filtration efficiency often leads to greater ventilation resistance. Therefore, companies should not blindly pursue filtration performance when selecting filter materials. They should select appropriate filter materials according to the actual positioning of the product and the target population.