Emulsion and Screen Coating
- Bring to class hairdryer
- Old towel
- One can never overlap process of coating and process of exposing
- As the chemical is sensitive to light one can only do coating and drying first of all the screens before exposing
- Ensure Red lights are on only
- Make sure coater size fits the screen.
- Ensure the coating tool edge is clean.
- Ensure you have a wet towel to wipe the edges of the coating tool as you finish coating each screen.
- Pour some of the chemical in the coater.
- Close the container immediately and/or cover to ensure that no light is affecting it
- Coating the screen: Start with two coats on the back or inside the frame of the screen, turn the screen upside down and do two coats on the front side, flip the screen again and coat two times back of the screen. Finishing coating on the back side will push ink on the top of the screen, where transparency will be placed. Collect with tissue any accumulated ink on the side of the screen and check if any got onto the frame itself.
- Check the screen quickly against the red light, to see how even is your coating.
If not happy – wash the screen immediately in the sink , dry and recoat
- DRYING : Let it dry flat- the back side of the screen should facing. Ideally, you should dry your screen overnight on the rack inside of the cabinets
use a hairdryer and leave it on adjacent to the screen; turn the screen upside down and rest elevated; cover the facing frame with the of paper to prevent too much light affecting the surface. Many times the screen is dry but the frame has caught a lot of drips that can stick to the glass of the exposing machine and/or stain the fabric of the exposing machine.
- Screen and frame are completely dry (please check the frame as often ink builds up and ink drips/spills are overlooked during coating
- The rest of the screens are stored away or out of the way covered with black fabric or black paper or in the cabinet
- Clean the top of the glass with provided glass cleaner
- Set the Keywell timer to 18 seconds (if the coated emulsion is thicker exposure will be longer)
- Set the Keywell vacuum controlling to 30 (this is set for exposing thicker and larger frames or set of 4 frames we will be using in class)
- The green button should be on during exposing. If more units are exposed at the class time-KEEP IT ON- do not turn off. If you turn it off WAIT at least 10 minutes