position: EnglishChannel > Sci-Tech News > Article

783sun.com: New technology enables reuse of masks

Source: International Communication Center for Science & Technology| 2020-05-06 11:24:01| Author: Liu Yin & China.org

本文地址:http://824.433nsb.com/English/ChinaNews/2020-05/06/content_934279.shtml
文章摘要:783sun.com,自己同样要面对数道不可思议巨蛇,这大家全力冲 在哪个网吧精神境界。


(Photo/VCG)

With the COVID-19 epidemic held at bay in China and the resumption of work and production gearing up, the demand for face masks is increasing again. Also, with the spread of the pandemic around the world, the gap between mask supply and demand is still prominent.

How can the effectiveness of each mask be maximized while ensuring safety? The mask charge regeneration and reuse technology developed by Chen Jianfeng, academician of the Chinese Academy of Engineering and professor of Beijing University of Chemical Technology, gives the answer. A few days ago, his research was recognized by several national academies of engineering at a video conference launched by the Royal Academy of Engineering in response to the COVID-19 pandemic.

"Mask filtration is achieved mainly by making use of electrostatic adsorption and fiber arrangement to block ultra-fine particles and droplets, and the charge layer in the middle of the mask plays an important role in protecting particles or droplets such as viruses and bacteria," Chen said in an interview with Science and Technology Daily. He explained that, during the use of a mask, its filtration effect could be damaged or even become ineffective due to the deposition of bacteria and viruses in the electrostatic layer, and static electricity in the charge layer could be eliminated due to moisture.

This means that masks have to be discarded after a period of time because the electrostatic filtration function no longer work. "If you want to reuse the mask in an emergency, you need to focus on two issues," Chen said. "One is how to kill or remove viruses and bacteria such as novel coronavirus that stayed on the mask, and the other is how to replenish static electricity to the electrostatic layer."

Since February, with the support of the Ministry of Science and Technology, a research team has urgently carried out research centered on key technologies and industrialization of reusable face masks.

"One of the key technical problems in the reuse of mask is to restore the charge in the filter layer or put external charges into it - that is, to achieve charge regeneration without damaging the mask material and microstructure," said Wang Dan, a professor at Beijing University of Chemical Technology. He said that the research team developed the charge regeneration technology through three steps, including hot water detoxification, charge regeneration, and test of paper scraps.

Aiming at four kinds of widely used masks - disposable medical masks, medical face masks, KF94 masks, and KN95 masks - the research team tested the filtration efficiencies according to the corresponding standards. The results showed that, compared with new masks, the filtration efficiency of recycled masks decreased by only 0.6% to 2.3%.

"After experimenting with various brands of masks, we have verified the effectiveness of the charge regeneration technology," said Xu Wanfu, general manager of Zhejiang Runtu Group. Xu said the company used to distribute one disposable medical mask to each employee every day, and then changed it to one every three days, saving a total of 122,500 masks from Feb. 20 to March 30.

"The reuse of masks and the industrialization of this technology can maximize the effectiveness of each mask while ensuring safety," Chen said. The professor said the reuse of masks during the emergency period has remarkable social benefits, as it can bridge the gap between demand and supply, and at the same time save resources and reduce environmental pollution.

In accordance with relevant requirements of the Beijing municipal government, the State Key Laboratory of Organic and Inorganic Composites of Beijing University of Chemical Technology recently led the formulation of the first international standard for this new type of reusable masks. According to testing, the masks could withstand washing no fewer than three times and be worn for at least 24 hours without obvious deformation. The masks also have the filtration efficiency similar to the performance of KN90 masks, and could be stored for at least five years.

"The research and standard-setting of the reusable mask project takes into account both the short-term emergency needs of epidemic prevention and control as well as the needs of long-term strategic reserves," Chen said, adding that the project team will actively promote the technology and provide scientific methods for the world to fight against the pandemic.

(You can also read this article at: http://www.487.mmy88.com/china/special_coverage/2020-05/05/content_76007812.htm)

Editor:Yu Haoyuan

Top News

  • Since the outbreak of COVID-19, researchers at the Wuhan Institute of Virology (WIV) of the Chinese Academy of Science (CAS) have been working on the frontline, undertaking a range of R&D tasks to prevent and control the pandemic. Still, rumors swirling around the internet have spread around the world claiming that the novel coronavirus was synthesized and that the pandemic was caused by a leak from the lab.

China makes coordinated efforts in COVID-19 related scientific research

Around the time of the 2020 Spring Festival, Ma Juncai, a researcher at the Institute of Microbiology, Chinese Academy of Sciences (CAS), and Wei Qiang from the Chinese Center for Disease Control and Prevention (China CDC), got together to brainstorm ideas about how to develop a support system for COVID-19 related research by leveraging strengths of both sides.

A Future to Expect: International S&T Community Expresses High Hope in Cooperation with Peers in China English

According to the latest news from Science and Technology Daily (April 14th), two COVID-19 inactivated vaccines were just approved for a phase I & II combined clinical trial by the National Medical Products Administration (NMPA) of China, making them the first batch in this category. The two vaccines were developed respectively by Wuhan Institute of Biological Products Co., Ltd of Sinopharm and Sinovac Research & Development Co., Ltd together with research institutes.

ICGEB Accepted 20,000 Protective Face Masks Donation from Chinese Partners

The ICGEB in Trieste, Italy has received a consignment of protective masks from its Chinese partners in Beijing and Taizhou, for distribution?to the local health authorities.

Copyright ? Science and Technology Daily, All Rights Reserved

mailto: yuhy@824.433nsb.com

58sun.com 299sb.com 永昌娱乐网站大全 58sun.com 亿博126最高佣金
766sun.com sun911.com msc858.com 377tyc.com sb919.com
msc678.com sb519.com 718msc.com sun258.com 39yh.com
玛雅1倍打码即可出款 tyc26.com 菲律宾申博红太阳娱乐登入 37kcd.com 527sun.com