Commit c53ea2f1 authored by Paloma GR's avatar Paloma GR
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Update README.md

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......@@ -94,7 +94,53 @@ And get a finished face mask with a replaceable wood pulp based filter
<img src="images/l1_3.jpg" width="400" >
## Molding
In order to advance into mass production of the mask, we have been developing a 3D printed wood pulp mold, based on [Startasys](https://www.stratasysdirect.com/technologies/fused-deposition-modeling/fdm-tools-paper-pulp-molding).
### Wood Pulp Molds
<img src="images/M_1.PNG" width="400" >
In the image above [[3](https://onlinelibrary.wiley.com/doi/abs/10.1002/pts.2289)] you can see how Wood Pulp Molds work.
The first part, called the moving half, of the mold is made from a solid material, and is the one that press the second part.
The second part, called the fixed half, has two different layers, this allows the water to flow through the fiber network, into a porous material, to the drainage channels (as you can see in the image above); this allows the mold to release water and keep its final form.
### First iteration
#### The Mold for Pulp Molding
You can find the mold .stl files in the following [link](https://github.com/FabLabUTFSM/WoodPulp-Filter---COVID-19/tree/master/3D_Models).
<img src="images/M_2.jpg" width="400" >
(Models M_1 correspond to the iteration)
#### Material Formula
We used the following foormula for the first test:
- Pulverized unbleached wood pulp: 11.3 grams
It has to have the following texture:
<img src="images/M_3.jpg" width="400" >
- Water: 269 grams
- Polyvinyl acetate: 66.3 grams.
#### Results
In the following pictures you can see the first results we got:
<img src="images/M_4.jpg" width="200" > <img src="images/M_5.jpg" width="400" >
#### Conclusions
- After 12 hours of drying, the material was wet. We will improve the geometry and introduce porosity that expells the water out.
- The porous material layer of the fixed half must have a 1 mm thickness.
- We must add drain channels to the fixed half.
- The material is getting a good resolution.
- The cylinders for the respiration holes must be extended.
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