At present, the coronavirus epidemic is spreading globally, and masks have become one of the most popular protective supplies. As personal protective equipment, the two most important indicators of masks are "filtration efficiency" and "leakage rate", which respectively represent the filtering ability of the mask filter material for particulate pollutants in the air and the degree of fit of the mask to the face.
If the leak rate is high, it means that pollutants can enter the mask through the gap between the mask and the face, even if the filtration efficiency is high.
The vast majority of civilian KN95 masks on the market (same as the US N95 standard) rely on standard size head models for "leak rate" tests. The size of a person's real face varies, and when worn, masks cannot effectively fit the faces of different people, which not only affects the protective effect, but also leaves significant indentations on the face. needle
In response to this problem, a company cooperated with Zhongke Suineng Technology Co., Ltd., which specializes in mask research and development, to develop a high-performance protective mask equipped with a 3D elastic skeleton keel. The company said that compared with masks using traditional brackets, it has improved protection, adaptability and comfort.
Staff from both sides used 3D printing technology and high-performance EM light-cured elastic materials to design and produce this soft and flexible 3D keel bracket. It took 48 hours from concept design to finished product. The keel scaffold has the following advantages and features:
1) Generate a three-dimensional lattice structure through parametric design, while ensuring supportability, and have a large area of close contact and fit with the face, reducing the leakage rate of mask products;
2) The keel bracket is based on soft EM material, which can be adapted to different face shapes and sizes of users through shape changes;
3) The soft keel frame reduces the pressure on the face and effectively solves the problem of facial indentation;
4) EM elastic material has passed ISO 10993-10: 2010 skin sensitization test (test report issued by SGS).
The two sides evaluated the overall protective effect of the mask using a professional TSI-8038 mask tightness tester. Under the actual conditions of actual wearing, different testers received a perfect score of 200+ and the overall filtering efficiency of the mask ( The concentration of particulate matter in the mask / the concentration of particulate matter in the environment) has reached more than 99.9%, meeting the KN95 standard; after repeated tests, this mask has better long-term wearing comfort.
The company said it is currently in the process of design finalization and mass production preparations. In the future, pricing may be more "friendly." At the same time, because the keel bracket can be used repeatedly, only the filter material needs to be replaced.
However, from a commercial point of view, there are still at least two difficulties. First, the 3D printed mask keel support still needs to be wrapped with filter material. The main difficulty in commercialization now lies in the supply chain of upstream filter materials, especially the stable supply of meltblown fibers. Before the outbreak, market demand for masks is small, so there are fewer companies engaged in the production of meltblown non-woven fabrics. In the annual output of various types of non-woven fabrics, the proportion of meltblown non-woven fabrics is very small. After the epidemic, the huge demand for masks and the low threshold caused a large number of companies to start the mask industry, which caused shortages and bottlenecks in the supply of non-woven materials, resulting in meltblown
The price of textiles is too high and too fast. The second is that the product needs to obtain domestic KN95 related standards, international N95 and FDA certification.