Recently a new application using the EXAIR E-Vacs has arisen. This is not a pick and place or system bleeding application. This is an application that some may not realize there is a need for. This is a degassing operation, the purpose is to remove any and all gas from a liquid or any viscous fluid. A picture of some silicon mold resin during the degassing process is shown below.
I recently encountered this through the molding of acrylic. In order to get a good finish part that is not going to have air bubbles in it you need to degas the liquid resin before it is poured into the mold. Depending on what you’re mold is made out of you may even need to degas it. In the instance I worked with a mold, it was made from silicon. This meant the resin for the mold needed to be degassed as did the acrylic resin after the mold was formed and being used.
To degas you need a container that will withstand vacuum being pulled on it. Then you simply set your container of liquid resin inside the “degassing chamber” and seal it up. All you need is a vacuum port to hook the E-Vac to and you’re up and running. You will actually be able to see the bubbles coming to the top of the resin. In some cases it may even appear to fill the bucket.