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With a plastic barrier, вЂњthe smoke simply drifts around them, so they will give the person on the other side a little more time before being exposed to the smoke. Linsey Marr, a professor of civil and environmental engineering at Virginia Tech and an expert on viral transmission, told the Times to think about exhaled aerosols in terms of a plume of cigarette smoke. In a pre-print paper (meaning its it has not yet been peer reviewed) published on July 30, British researchers determined that вЂњscreens are unlikely to provide any direct benefit in reducing exposure to the virus from droplets or aerosols when people are already located at 2 meters or greater or where they are not face to face.вЂќ (This is why airplanes, which typically replace their air every two to three minutes, are relatively safe compared to virtually any other seemingly confined indoor space.)ДЄnd while physical barriers are effective at blocking big droplets released from a personвЂ™s nose or mouth when they cough or sneeze, theyвЂ™re essentially useless at blocking the spread of aerosols within a contained room. Dilution of viral particles through adequate ventilation is the most effective preventative measure against the spread of the disease in a given space - outdoors obviously being the most ventilated space of all. The higher the concentration of viral particles in a given space, the more likely one is to become infected - which is why delta, which produces extremely high viral loads in infected people, is so contagious. SARS-CoV-2, the virus that causes COVID-19, is spread primarily through invisible aerosols that are exhaled when speaking (or, especially, singing), which can hang in the air for hours in spaces with poor ventilation. But according to a new report from the New York Times, these ubiquitous features of pandemic life may not work the way that many assumed - especially the countless restaurateurs whoвЂ™ve spent hundreds or thousands of dollars installing them. These see-through plastic barriers, typically set up between tables and at bar tops or takeout counters, are supposed to provide protective boundaries, safeguarding people from the spread of COVID-19.

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If you start trying to force it before it is fully softened, you will not get as even a bend, as it will be soft in some areas but not others along your bend line.If youвЂ™ve spent any time inside bars or restaurants during the pandemic, youвЂ™ve almost certainly encountered a space chopped up by a series of plexiglass dividers.

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That free point when the material is able to move quickly is when you want to shape it against the jig. When you are applying upward pressure on the end of your acrylic, you will feel it start to move against your hand, then it will move very quickly.

You must wait until the moment when you feel the material 'slump' as you have no way of measuring the heat. The problems with this bend were caused by not applying the heat source close enough to the jig and bending the material before the material was evenly softened across the entire width of the material. The bend is kinked, not even, and is too far away from the jig, so it is not straight and square with the end of the material. In the photo below, you can see a poor bend in a sheet of 1/16-inch thick plexiglass.

Bending Before the Material Is Soft Enough.

Run your heat tool gently back and forth along a cut plastic edge to soften it just enough that it turns clear.

You can use the same heat tool you use to bend plastic, to seal and neaten the cut edges of any plastic parts. You must use two hands to do this with even pressure, or your material will twist slightly as you bend it unless you are working with a very thin, narrow strip. When you feel that your sheet is allowing you to push up evenly on it, remove your heat source and set it safely aside on a stand or heat-resistant surface the end of your tool will be hot! Hold the sheet material evenly with both hands (both in protective gloves) and push the sheet up gently bending it against the line of the jig as shown in the photo above. It should not be softer on one side than on the other.

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You should be able to feel this point evenly along the full width of the strip you are bending. There will come a point when the material will move upward easily as it reaches a molten state. While you are applying even heat along the bend line, press gently upon the sheet of material you are bending. If you turn your heat source as you pass across the acrylic, the heat won't be evenly applied across the entire width of your sheet. Try to keep the heat source at a right angle to your sheet of plastic/plexiglass.