Seeing more and more ppl looking at printing masks. It's a noble gesture but these printers are not the tools for the job.
The materials are not biocompatible. If you can find a biocompatible material, the next problem is they're rigid. A rigid mask is not going to seal. You can add a seal but the seal needs to be biocompatible too. The seals I'm seeing ppl add are quite thin.
If you're lucky you may get it to seal to your face but it won't remain sealed when you move your face or your jaw. Also facial anthro differs greatly between ppl, it won't fit for others.
Masks need to either be all soft or textile materials or if it has a rigid frame, also have a large compliant soft seal. Look at dust masks and CPAP masks.
Perhaps a better idea is to print a mould to mould the masks out of biocompatible silicone.
There's still the problem of how you're going to provide a proper level of filtration. You could adapt to an off the shelf filter. If you hack together some do it yourself filter you may do more harm than good
翻譯年糕
Sen Kun
2020-03-22 14:12:00
Given how deep the shit is with shortages that the CDC is even asking frontliners to make do with bandanas (!), I say carry on printing. Anything is better than nothing.
Biocombatibilty. Photopolymers once fully cured are just plastics. No worries about leaching we're not talking about stic
king it in your mouth or implants.
https://www.researchgate.net/....../311422937......
Rigidity and sealing. Choice of resin is key. Flex resin, etc. are available.
Filtration. Again, anything is better than nothing. Because, viral load.
https://mobile.twitter.com/....../status/1239560638239838215
Finally, wearing a mask is not all about protecting yourself. Don't go getting a false sense of security with one. All it does is reduce the risk for you and (if you're asymptomatic) everyone around you. The more people that wear a mask, the better.
John Driggers
2020-03-22 14:23:09
CDC is telling HCP that a bandana is a last resort in the absence of PPE. What we are printing is the same, except you are proposing to use photopolymers which contain unknown monomers.
Sen Kun
2020-03-22 14:26:57
Luke Klinkenberg
2020-03-22 14:29:41
The material on your link seems ok at in least short term. For sure if things got desperate I'd wear whatever i could get my hands on.
Sure it's not on your mouth but it is in the wet air path which is subject to tighter regulations than just skin contact as it reaches mucosal membranes. You shouldn't fit these to someone effected by the virus in case it was an irritant and worsened the pneumonia
John Driggers
2020-03-22 15:39:06
Sen Kun
2020-03-22 15:40:57
Absolutely.
" The median-fit factor of the homemade masks was one-half that of the surgical masks. Both masks significantly reduced the number of microorganisms expelled by volunteers.. "
Homemade masks as an alternative to commercial face masks. Better than nothing. This is the situation no?
John Driggers
2020-03-22 15:57:10
Sen Kun
that a sewing machine and a tshirt is better option? Yes.
Noemi Balog
2020-03-23 04:26:28
nextdent ortho clear resin is biocompatible it is for dental splints and retainers
Richard Tyler Jr
2020-03-23 04:45:30
The main three routes of entry for viruses into the human body are the mouth, nose and EYES.
