Today, China is vigorously promoting the implementation of the most stringent environmental protection policy in history. Most of the small and medium-sized factories that do not meet the standards are facing closure or merger, the increase in industry concentration and shortage of raw materials, which directly affect the price of paper products
As the core material of medical masks, melt-blown nonwoven fabrics directly affect the protective effect of masks. There are many factors that affect meltblown fabric filtration efficiency, such as fiber linear density, fiber web structure, thickness and density.
However, as an air filter material for a mask, if the material is too tight, the pores are too small, and the breathing resistance is too large, the user cannot smoothly inhale the air, and the mask loses its value.
This requires that
Common Surgical Masks are mainly composed of three layers of non-woven fabrics. The inner layer is a common non-woven fabric; The outer layer is waterproof non-woven fabric, which is mainly used to isolate the liquid ejected by patients. The filter layer in the middle is polypropylene melt-blown nonwoven fabric treated by electret process. Finally, after the completion of surgical mask production , it shall be disinfected by ethylene oxide, allowed to stand for 7 days to volatilize toxicity, sealed, packed and transported away. The
Everything had been going well, the Guardian reported on Oct. 2. A successful vaccination program would drive a post-epidemic recovery in the global economy, stock markets were back to record highs, and prices were rising just enough to make deflationary fears a thing of the past.
But the supply crunch that initially put a question mark over whether there would be enough PlayStation consoles under the Christmas tree is swinging into a crisis involving energy, labor and a shortage of transportation capacity from Liverpool … Read the rest
It is no exaggeration to say that we are living in unprecedented times: as government officials order people to stay home, cities become empty unless it is absolutely necessary to go out, (most) stores close, businesses close their offices and instruct employees to work from home, and nearly 7 million people in the U.S. apply for unemployment benefits, and the number continues to grow.
