Since the outbreak of the COVID-19, the demand for masks has soared, causing the supply of polypropylene (PP) melt-blown machine and materials to be in short supply and prices soaring. Because the expanded polytetrafluoroethylene (PTFE) microporous membrane has a special fibrous microporous structure, when the microporous pore size is properly controlled, it can block viruses and PM2.5 haze particles in a physical barrier.
To this end, some companies have used PTFE microporous membranes and polypropylene nonwoven fabrics as composite materials for the application of masks to produce PTFE microporous membrane composite filter materials (hereinafter referred to as PTFE mask membranes) instead of meltblown fabrics. Make up for the market shortage. It is worth noting that in a very short period of time, many companies have entered the field of PTFE masks, and the chaos of production quality management has become prominent.
In view of the fact that mask supplies involve public health protection and safety, Suko specifically pointed out the following tips for PTFE mask films:
1. The e-PTFE microporous membrane produced by the unique multi-directional stretching process of PTFE material has a microporous structure in which micro fibrils and nodes are overlapped, so that it can achieve physical barrier to various particles while breathing. The intact PTFE mask film has the properties of waterproof and moisture permeability, blocking viruses, and its filtering efficiency can be better than traditional melt-blown cloth. In order to meet the requirements of the mask standard “high filtration efficiency, low breathing resistance”, the selection of raw materials and stretching processes must be strictly controlled to avoid defects such as holes, damage, and pollution, which affects the performance of the mask.
2. The production of PTFE mask films must use non-woven fabrics with reliable quality, and strictly control the total number of colonies. The chemical bonding method should be avoided during the compounding process, and at the same time, the safety evaluation of the chemical substances used should be strengthened.
3. The “holes” that may appear in production and the damage that cannot be cut in time should be clearly marked to facilitate the removal of defective products during the subsequent mask production and inspection.
4. Mask manufacturers that use PTFE mask films should strengthen the management of incoming inspection, online inspection, and product inspection, and firmly reject unqualified raw materials and products. The performance index of the mask produced with PTFE mask film should meet the requirements of relevant national standards, and the filtration efficiency of the salt medium should not be less than 90%.
5. The PTFE material itself is non-toxic, but it will produce toxic substances after combustion and decomposition. It is recommended that all mask companies clearly mark the mask with PTFE on the outer packaging of the mask made of PTFE mask film. It is strictly forbidden to contact the mask with an open flame.
6. Although the PTFE mask film can withstand boiling water and ultraviolet light, the filtration efficiency will not be greatly reduced under the premise that the filter membrane is not damaged, but the thickness of the PTFE mask membrane is reduced to a few to meet the requirements of reducing respiratory resistance. Micron is difficult to withstand the conventional washing requirements without a good compound. Daily water washing, scrubbing, and drying with a blower may damage the inner filter membrane and lose the filtering effect. Therefore, users should wear the mask properly and use it reasonably to avoid the risk of damage to the filter material in the mask.
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