Commit 19f1d760 authored by Paloma GR's avatar Paloma GR
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Update README.md

parent 3fd3ffe4
......@@ -25,6 +25,11 @@ It is crucial to be able to mass produce the half masks.
The advantage of Wasp design is that the filters are held on the inside side of the mask, decreasing the contamination of the filters when changing them.
There are also fabric masks in which these filters could work [like this one, the HKMask](https://diymask.site/).
Molded wood pulp is meant to be a disposable material and it is 100% biodegradable as all the additives we are suing are.
This is a characteristic that we want to take advantage of as after the pandemic we wouldn't want to have
polluted the environment with more waste. This also means that the half masks will last less than N95 or other masks. We embrace such short temporality, and will
asses it to notice our users. We expect that these protective equipment lasts 3 to 4 weeks.
## Filter Key Parameters to measure [[2](https://scientificfilters.com/wp-content/uploads/2016/03/BasicFiltrationConcepts.pdf)]
- Scanning Electron Microscope [SEM](https://en.wikipedia.org/wiki/Scanning_electron_microscope): This tests characterize the materials porosity. Target: < 0.1 um.
......@@ -34,20 +39,14 @@ obtained". Target: 95%
- Preassure Drop: The higher the pressure drop, the harder it is to breathe. Target: <5.82 [mmH20] at a flow rate of 32 [L/min].
All this tests could be replaced by a DOP ([DOP Guideline](http://www.eacoontario.com/pdf/2013/Revised%20August%2027%202013%20DOP%20PAO%20HEPA%20IntegrityTesting%20Procedure.pdf)).
## Filter Key Steps:
- SEM Measurements, measure the porosity of the wood pulp sheets; it must be >0.1um
- Particle counting measurement, measure filtering capacity of the material, the ideal scenario will be an N95 filtering capacity.
- In case the material's porosity is bigger than 0.1um or the filtering capacity isn’t enough, Arauco is going to modify their manufacturing process to get a tighter material, or we are going to test a Electrospinning machine.
- Make the material Hydrophobic.
-Industrial production.
All of these steps are meant to test the feasibility of the development quickly.
Later on we will seek to comply NIOSH regulations.
## Filter Development
Wood pulp sheets have the following disadvantages:
Hydrophilic, absorbs any liquid very fast so it could have a lower life expectancy and could absorb contaminated droplets, this can be controlled through design or modifying the material properties.
Due to air flow, the user could inhale wood pulp fibers, we are adding wood pulp based fabrics to act as a filter. It’s relevant to point out that wood fibers aren’t toxic, you just can’t digest them.
FDM 3D printed masks are slow to produce and have a porosity bigger than >0.1um, we are looking to develop the plastic parts of the mask through injection molding.
- Hydrophilic, absorbs any liquid very fast so it could have a lower life expectancy and could absorb contaminated droplets, this can be controlled through design or modifying the material properties.
- Due to air flow, the user could inhale wood pulp fibers, we are adding wood pulp based fabrics to act as a filter. It’s relevant to point out that wood fibers aren’t toxic, you just can’t digest them.
- These filters will have a shorter life than plastic filters, we expect them to be replaced every 4 hours.
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