venturi vacuum degassing apparatus for use in rapid biomedical part prototyping

by:Keyuan     2020-07-25
Project team: Richard H.
Siderits mdchristening Serena MSIIIVarun Singh
When you make blanks for processing plastic parts or casting models from room temperature vulcanization, the research pathology team removes bubbles (RTV)
Silicone rubber is an important step.
The gap left by the bubbles will destroy the original Perfect model or part.
Before setting up, the \"degassing device\" or the vacuum \"deaerator\" will remove the bubbles from the plastic resin or silicone rubber.
Commercial Degas may be expensive.
This project shows you how to make a small vacuum degassing unit for less than $20.
The only equipment you need to use is a standard air compressor. 1.
Plastic container for vacuum chamber-
From the \"dollar store \"(1 dollar). 2. Semi-
Hard plastic hose and air-
Hose joint-
From the local hardware store (4 dollars). 3. Venturi-
Type vacuum pump *-
Freight from Port (12 dollars). 4. Hot glue gun.
* Vacuum pump specifications: Wenchang-
The type vacuum pump is connected to the compressor to provide the airflow that produces the vacuum. Note: Air-
Vacuum pump: including 1/2 \"ACME (R134a)connector.
Vacuum level: 28.
3. mercury at sea level;
Air consumption: 4. 2 CFM;
Air Inlet: 1/4 NPT;
Overall size: 8-
3/8 \"L x 5\" W x 6-1/2 \"HWeight: 1. 75 lbs.
The container we will use must be strong enough so that it does not collapse when you pull a vacuum on it (
I know it through hard work)
It needs to be deep enough to hold the mold of the model you are using.
The container in this picture has a solid corner, a solid edge, and deep enough to hold the small mold from which we want to pull out the bubbles (de-gas).
The short segment of the hose must be hard enough so that it does not collapse under vacuum.
A quick connection on the other end is not necessary, but you can buy it at any hardware store.
The threaded end is threaded only at one end, and the other end of the connector has a bayonet tip that enters the tube.
Make a hole in the side of the container.
Instead of using a drill bit, you can consider heating the connector and melting it through a plastic container.
You can also heat the bottom of the drill bit and melt it to the side of the plastic container.
This will ensure that the nozzle fits closely.
When there is a hole on the side of the container, screw in the connector and heat it
Glue or rubber holds the nozzle in place from the inside.
This accessory must be air.
Tight Image 1: examples of two parts of plastic resin available through micro
Marking or room temperature vulcanization (RTV)
Silicone rubber two-part mold mixture obtained from PolytekImage 2: example of bubble-free flawless, by pouring liquid two-part plastic resin into plastic blanks made in PVC pipes, the inner surface of the pipe has been coated with a layer of Vaseline as a release agent.
Figure 3: This is an example of a \"blank\" of a two-part plastic resin that was degassed.
Then put the blanks on the CNC milling machine to make models of various human hand bones.
Most importantly, there is no gap in the material.
This little \"hand-
Vac \"will create enough vacuum to remove the bubbles from most resin and RTV silicone molds, but still cost less than $20.
It can also be shipped from the port.
Comply with all safety guidelines, including but not limited to: 1.
Use a vacuum system or compressor. 2. Power-
You have never read the tools for instructions. 3.
You never learn all the tools you use correctly. 4.
Anything that heats, squeezes or causes trauma, corrosiveness, or heat damage.
We are sharing our experience, not telling you to do it.
If you choose to try this method then it is at your own risk!
No, we\'re not kidding.
Facilities: parabjuhh Exp department and research center for the object: special project application: parts manufacturing of scientific devices: rapid prototyping in laboratory development
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