face masks, false security
6 years ago
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- 6 years ago
- 6 years ago
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The Growing Debate Over Masks
Comments (125)Annie, I noticed that lack of knowledge about fabric weaves, also. Batik is not a type of fabric. As most of us know, it is a dying technique. And, batiste, is much too thin to use for this. Given the rest of the ignorance about fabrics, weaves, and fibers that is probably not a misquote. It is also not true that the spaces between fibers are larger in a knit than in a woven. It depends on what fabric is being talked about. Some of these new knits do actually have some pretty large spaces between the fibers. Most of those are synthetic knits and if you wear a pair of pants made out of that fabric, you will feel the wind blow through. All knit is not the same, though. If you have a nice cotton interlock knit, you will not see any light between the fibers, unless, of course your fabric came from an old worn out garment. A cotton interlock knit will also have a bit of fuzziness to the yarns that it is knit from, thus, creating little bits of fuzz that may catch that droplet of contaminated moisture. A synthetic fiber is more like a string of plastic that is smooth and has a slick surface that won't catch or hold anything. A fabric that is really tightly woven is what is called "sheeting". I have seen sheeting fabric on bolts that is dyed in the batik method. It was popular back some years ago. Sheeting cotton is so hard and tight that the sewing machine needle needs to be really sharp to pierce it and sometimes multiple layers of it can be really hard to sew. You may need a thimble to even get a hand needle through it. It is possible that this experiment used a piece of batik dyed cotton and that cotton fabric happened be a sheeting fabric. I never understood why it is said that this is a good fabric to use as quilt backing. It may be sturdy , but it is so hard to get a hand needle through. A cotton muslin would be a better choice for running quilting stitches through. I am not sure how sheeting differs from a percale. A tight percale might be a good substitute. It might even be classified as a percale. I don't know. But, I do know that it is some tight and tough stuff without being bulky. I have some in my mask making arsenal and have been sewing on it and through it the last few days. The sewing machine needle will let you know when you hit a piece of sheeting fabric. I think that this researcher, or this person who wrote about it, did not know anything substantial about fabric, weaves, knits or fibers. This is very unhelpful information. Also, there is not really anything that is designated as heavyweight quilters cotton. Most cotton that is sold for piecing at places like Joanns is pretty poor cheap cotton, with a few minor exceptions. Good quality cotton that is sold in speciality stores is not better quality because it is "heavier". It is good quality because it is made of longer staple cotton fibers that make the fabric nicer. Being "heavy" is not a quality that you want when piecing....See MoreMask pattern designed by a nurse, super easy.
Comments (24)I just finished my first one using this video (thanks, Raven!). I didn't have the cord, so I used double-fold bias tape, sewing the length of it. But the mask didn't slide well on the tape, so I pulled it out and waited for the 3/16" clothesline that I ordered. I also ordered paracord, but Walmart was out of it. I used a safety pin to thread the cord. When I first tried the mask on there were gaps on the side. But then I followed the directions in her "questions answered" video on how to put it on properly, and that worked really well. Now I just hope it fits my son, as I made it for him....See MoreJust ordered some extra masks...
Comments (25)Videos of Portland are criminal. I'm with you Jasdip. We don't like the ear loops but I have a four pack of t-shirt I've used for 5 years that are very comfortable. We have worn masks at work on and off for various reasons for 20 years so not unusual for us. I made a dozen t-shirt variations a couple months ago. Just like you describe. Once fitted, I paper clipped, then did a couple quick stitches. We don't shop even in phase 4 with only one death in very populated NYC the past few days. Our county is 7 days without incident. DH had an eye appointment a few days ago and was uncomfortable for the few hours in the Dr office....lots of testing. Back at work he will need to wear mask and face shield for 10+ hours, so we need to try options. They sent us filters to try, being mandatory with any personal mask. We still have a box of N95's but they have the exhale vent. We use a bandana inside and drape over the vent. (the variation DH did not like long term). No ear contact, just head rubber stretch, but he felt constricted. Ear loops need adjusting for head size. They can be comfortable if they are adjustable. Most of our co-workers and friends have posted so many favorites and failures....See MoreWhat's new in masks, Sept 2020 edition
Comments (22)A lot of analysis has been around regarding what material makes a face mask effective. I have not come across much discussion about another equally important characteristic contributes to face mask effectiveness to block viruses. It seems to me that structural geometry of a face mask is equally if not more important than the nature of the material for making a face mask. A typical face mask has about 25 square inches. The problem with most home made face masks is that they lack structural stiffness, So when you exhale, you lung pushes out air thru 25 sq. in. of fabric, but when you inhale, you suck the fabric so closely attached to your face, and you are only filtering incoming air thru about 4 sq. in. of fabric. As a result, air will be forced thru the fabric at much higher pressure and speed, and more virus will be forced thru the fabric. dcarch...See More- 6 years agolast modified: 6 years ago
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