According to a Duke University study, a common masking pattern may not help limit the spread of coronavirus.
Researchers found that while most cotton, cloth or surgical masks tested were effective in limiting the amount of airway drops a person excreted during the conversation, the “mantle” or the wool on the neck actually results in many smaller drops being expelled.
“We think this is because wool, the textile fiber, breaks those large particles into many small particles,” said Martin Fischer, associate professor of research at Duke.
Wear Your Mask Because It’s Cool Shirt, hoodie, tank top, sweater
According to most experts, the new coronavirus that causes COVID-19 is transmitted from person to person mainly through respiratory drops that we all pass out of our mouths when we talk, sneeze, cough, or breathe heavily. .
Maybe releasing more droplets through a thin mask is worse than expelling larger droplets without a shield, Fischer said.[Smaller particles] tend to last longer in the air, they can travel through the air more easily, so this can actually be counterproductive when wearing a mask, “Fischer said. so. “Not in every case, there is a better mask. There are some masks that really hurt more than doing well. ”
However, some argue that the conclusion is too early and we don’t have enough information to claim that those masks do more harm than good. Slate news director Susan Matthews points out that researchers only tested a single subject with an antique mask, increasing the chances that the mask did not fit or had some other problem with the mask or its counterpart. test object.
The subject also repeated only the concise phrase “stay healthy, everyone,” 10 times for each mask. The subject did not speak at different volume levels, coughing, sneezing, or simulating other conditions such as heavy breathing during exercise. Gaiter masks are very popular among runners because of their lighter construction and a better fit.
At a time when face masks of various sizes and types flooded the Wear Your Mask Because It’s Cool Shirt, hoodie, tank top, sweater market, a Duke University study in the US showed which masks were most effective in preventing the spread of water droplets emitted by everyone while talking – an important aspect of reducing Covid-19 transmission.
For the study, published in the Wear Your Mask Because It’s Cool Shirt, hoodie, tank top, sweater Science Advances journal, Duke University researchers (Emma Fischer, Martin Fischer, David Grass, Isaac Henrion, Warren S Warren and Eric Westman) invented an inductive device. Cheap laser transformer and use it to compare 14 types of masks and face masks.
“Surgical masks are usually worn by medical personnel and have been tested quite a lot in medical institutions. But there is no quick, easy, and cost-effective way to demonstrate the effectiveness of a variety of masks such as a loose cloth mask or a face mask, ”says Fischer.
How is the mask-based experiment conducted?
For the study, researchers have devised an easy-to-perform, inexpensive laser experiment that measures the number of respiratory drops released from different coatings whenever the wearer speaks. The set-up includes a black box (dark bezel), laser, lens, and cell phone camera – all of which cost around $ 200. The laser beams are used to create a plate of light inside the box.
For the test, one person was asked to wear a mask and stand in a darkened room. Then, the person is asked to say the phrase “stay healthy, everyone” five times in the direction of the laser beam, the laser scattering light from the droplets emitted in the speech. Using a portable camera, water droplets were recorded and a simple computer algorithm counted them.
Companies and manufacturers can set up and test their mask designs before production, which is also very useful, researchers said.
Masks are ranked based on the relative number of drops on a scale of 1.0, which represents the number of droplets that hit the paper when the person is not covering his face, to 0.0, when it is dripping or not spread.