Vacuum Exposure Unit
A vacuum exposure unit is a device used to transfer a pattern from a photographic film to a substrate, usually a silicon wafer, by means of light-activated photopolymerization. The main advantage of using a vacuum exposure unit is the elimination of air bubbles which can cause defects in the final product.
What is a vacuum exposure unit?
A vacuum exposure unit is a device that uses a vacuum to hold a piece of film or other light-sensitive material in close contact with a printing plate, thereby creating a high-quality image. The vacuum also prevents air bubbles from forming between the film and the plate, which would result in a poor-quality image.
How do you use a vacuum exposure unit?
A vacuum exposure unit is a machine that is used to expose a photographic film to light. The film is placed on a glass plate and the machine is turned on. The machine sucks the air out of the chamber and the film is exposed to light.
What does an exposure unit do?
An exposure unit is a device that is used to expose a photoresist-coated substrate to light. The light causes a chemical reaction in the photoresist that allows it to be removed in selected areas, creating a pattern.
Do you need an exposure unit for screen printing?
An exposure unit is not strictly necessary for screen printing, but it will make the process easier and produce better results. Without an exposure unit, you will need to rely on sunlight or a powerful UV light to expose the screen printing stencil to the light-sensitive emulsion. This can be tricky to do evenly, so you may end up with some areas of the stencil that are under- or over-exposed. An exposure unit ensures that the entire stencil is exposed evenly to the light, resulting in a crisper, cleaner print.
How do you make an exposure unit?
After the stencil has been exposed, you will need to turn off the vacuum and remove the screen printing frame from the exposure unit. Once the frame is removed, you will need to wash out your stencil with water. Once the stencil is washed out, you will need to dry it off and then you can apply it to your screen printing mesh.
Bottom Line
A vacuum exposure unit is a machine that uses vacuum pressure to hold a piece of film or paper against a printing plate, thereby creating a print. This type of machine is often used for making high-quality prints, such as those used for lithography.