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As for the mask with valve to facilitate breathing, it is "A large number of droplets pass through the exhalation valve without purification, and this makes it ineffective in stopping the spread of Covid-19, if the person wearing the mask has it.".
The researchers concluded that despite the comfort provided by both the shield and the mask, masks made of high-quality fabric or medical masks with a simple design are still the best to help prevent the spread of the virus.
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The model revealed that people wearing plastic face masks, or masks equipped with a breathing valve, can spray invisible droplets over a very wide area when sneezing or coughing, making this equipment ineffective in preventing the spread of Corona when it is used alone.
In a report published Tuesday in the American journal “Physics of Fluids,” published by Agence France-Presse, researchers at Florida Atlantic University used vertical and horizontal laser sheets to trace tiny droplets of distilled water and glycerin to as they spread from the head of a hollow mannequin. You can wear a plastic shield or a mask with a breathing valve.
The researchers said that the face shield initially blocked the passage of the drops as it progressed, but “the drops can move around the plastic eyebrow relatively easily and spread over a large area.”
As for the mask equipped with a valve to facilitate breathing, “a large number of drops pass through the exhalation valve without purifying them, and this makes it ineffective in stopping the spread of Covid-19, if the person wearing the mask is infected. “
The researchers concluded that despite the comfort provided by both the shield and the mask, masks made of high-quality fabric or medical masks with a simple design are still the best to help prevent the spread of the virus.
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