NS chainstraps or reusable cloth masks Which people are using since last one and half year Got Incentive to Be a Hero In closed areas to avoid infection COVID-19.
A recent scientific study from the University of Colorado at Boulder found that washing and drying them does not reduce their ability to filter viral particles. ,good news for sustainabilitysaid the lead author Marina VancePaul M. Ready, Assistant Professor in the Department of Mechanical Engineering. ,That cotton mask you’re washing, drying, and reusing is probably still fine., do not throw it away”.
This study published in the journal Aerosol and Air Quality Research, also confirms previous research showing that placing a cotton mask over a surgical mask—one that fits snugly to the face—provides more protection than cloth alone.
science for sustainability
Since the start of the pandemic, approximately 7,200 tonnes of medical waste has been generated every day, many of which are single-use masks that end up in the trash at the end of the day or when you get out on time. “We were very upset by the start of the pandemic, when we would go out and see all these disposable masks littering the environment, so I was eager to join forces with the scientists from the nearby National Renewable Energy Laboratory (NREL) who came here. Study how washing and drying affects reusable cloth masks,” said Vance, who is also on the Faculty of Environmental Engineering program.
Their process was fairly simple: Make double-layered cotton squares, wash and dry them frequently (up to 52 times, the equivalent of weekly washes for a year), and test them roughly every 7 cleaning cycles between. While the masks were not tested on real people, but instead were mounted on one end of a steel funnel through which researchers could control a continuous flow of air and airborne particles, the researchers tested the masks using real conditions . With a high level of humidity and temperature to mimic the effect on our breathing masks.
yes ok The cotton fibers began to break down over time after repeated washing and drying, the researchers found did not significantly affect the filtration efficiency of the fabric., The only noticeable change was that the inhalation resistance increased slightly, meaning the mask might find it a little harder to breathe after a bit of wear and tear.
“Scanning electron microscopy showed that washing and drying resulted in gradual decomposition” Cotton fibers on the scale of several micrometers to hundreds of nanometers in the form of delamination of the fiber wall and fibrillation of nanofiber components. The results indicated that cloth masks could be placed over surgical masks for added benefit, and cloth masks made from cotton cloth could be washed and rewashed multiple times without significant loss in filtration efficiency. Can be used, ”the experts concluded.
Mask fit is important
The shape of the face of each person varies greatly. Therefore, depending on the size of the mask and how well the person fits it, it may or may not fit. Previous research has shown that a poorly fitting mask can inhale and exhale up to 50% of airborne particles, as well as transmitting viruses. This study is not the first to find that cloth masks provide less protection than surgical masks or a layered combination of surgical and cloth masks.
how well to measure Masks filtered the air they breathe (protecting the person wearing the mask without reducing transmission from the source), this study found that cotton cloth masks filtered out up to 23% of the smallest particle size (0.3 µm) travel that may contain the virus. Tissue leaked even less, at only 9%. In comparison, surgical masks filtered between 42 and 88% of smaller particles, and cotton masks achieved filtration efficiency closer to 40% over surgical masks. As expected, the KN95 and N95 masks performed best, filtering out 83–99% of these particles.
But while this study found that only cloth masks offer less protection from the virus than a layered approach or disposable masks, such as surgical masks, such as the KN95 and N95, this is still important information for those who use the facility. , rely on fabric for affordability and reusability. , the authors noted.
“I think the best mask might be the one you’re actually going to wear. And it will fit snugly over your face without being too uncomfortable,” Vance said.