It is no mystery that properly coating and exposing a screen is the most tedious and frustrating part of screen printing. There are many factors that come into play that make it tricky to perfect, and everyone's exposure times and set ups will be different because of this. We want to help make this learning process as easy as possible so that everyone can enjoy screen printing.
(PRINT THIS USING AccuRIP FOR BEST RESULTS)
How to use an exposure calculator:
INTERVAL SUGGESTIONS:
500w Halogen Light = 1 minute intervals
Florescent Tube Exposure Units = 20 - 30 seconds
Single Point Exposure Units (Metal Halide) = 10 - 20 seconds
How to do an exposure test:
This method will help someone who doesn't have access to an exposure calculator figure out how long to burn their screens for simple designs. Using an exposure calculator is ideal for figuring our how long to burn high detail and half tones, but this will work for most applications.
How to prevent dots in your emulsion:
If you're new to coating screens its almost inevitable that you have experienced dots in your emulsion that are a pain to wash off and make screen cleaning more time consuming. This is a little trick we figured out for preventing that.
Storing screens in a dry environment:
Emulsion is made up mostly of water, so when screens are coated they need to be stored in a dry climate or they won't dry correctly so that they can be exposed. It is important to run a dehumidifier in your dark room to prevent any issues regarding moisture in the air.
Post exposing screens:
Post exposing screens is a very simple, yet very beneficial step of the exposure process. If there were any inconsistencies in your exposing process (any under exposed emulsion that didn't wash out on you wile washing out the design) this process will insure that those spots are nice and hard. It will also insure overall longevity of designs on your screens.
Setting up multi-color designs for exposure:
Exposing multi-color designs can be tricky at times. It is important that they are placed on the screen in a very similar manor so that when you get your screens onto a press you don't exceed the limits of your registration adjustments trying to line up the print. If the design isn't lined up right you'll have to redo the process from the beginning!