Commit 22ee218a authored by Paloma GR's avatar Paloma GR
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# Wood Pulp Filter for Covid - 19
<img src="images/l1_0.jpg" width="400" >
<img src="images/l5.jpg" width="400" >
This project is been developed by
......@@ -24,8 +24,13 @@ The advantage of Wasp design is that the filters are held on the inside side of
We think that this detail would help decrease 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/).
## Filter + Half Face Mask
For the filter we also need a half face mask. We are working in a version made from wood pulp instead of 3D printing to be mass produced with compression molds similar to egg boxes.
The filter frame is still 3D printed. Our next step is to Incorporate it in the mold and make it with wood pulp.
**According to our calculations the half mask will cost $0,029 and the filter will cost $0,1.**
## Key Parameters to measure [[2](https://scientificfilters.com/wp-content/uploads/2016/03/BasicFiltrationConcepts.pdf)]
## 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.
- Particle Retention Rate: "In a filtration process, the particle retention efficiency of a depth-type filter is expressed in terms of the particle size (in µm) at which a retention
level of 98% of the total number of particles initially challenging the filter is
......@@ -35,7 +40,7 @@ obtained". Target: 95%
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)).
## Key Steps:
## 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.
......@@ -49,14 +54,8 @@ Due to air flow, the user could inhale wood pulp fibers, we are adding wood pulp
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.
## Current Development
<img src="images/l5_0.jpg" width="400" >
We are working in a version made from wood pulp instead of 3D printing to be mass produced with compression molds similar to egg boxes.
The filter frame is still 3D printed. Our next step is to Incorporate it in the mold and make it with wood pulp.
**According to our calculations the half mask will cost $0,029 and the filter will cost $0,1.**
### Raw Material
### Raw Material for the filter and mask
Celulose comes in letter size sheets, 21.59 cm. X 27.94 cm with a thikness of 1mm.
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