![]() When you’re all set up, turn on the Speedball UV Light and set a timer for your chosen exposure time. Remember to dry your photo emulsion in complete darkness and only bring the coated screen out when you’re ready to expose. If the screen is exposed to too much light before you’re ready, your image may not expose properly. We chose to do this process in subdued lighting which gives us a little more time to set up. ![]() Place a sheet of glass or perspex on top, to hold the film in place. Once it’s placed, the design should me a mirror image when you look at it from above. The drawn (or inkjet printed) side of the artwork should be down against the mesh. The mesh should be raised above the table. For more help on coating your screen, see this blog post. Place your coated, dried screen on a flat surface, frame side down. Our artwork was Inkjet Screen Film drawn with Zig Opaque Pens and Jacquard Film Markers. We used an A4 43T screen coated with a single layer of Speedball Photo Emulsion and Sensitiser. Lightweight, portable and easy to use, the Speedball UV LED Exposure Lamp offers users the same exposure time for Diazo Photo Emulsion screens as. This was perfect for our setup, but will vary slightly depending on your method and materials used, so you are likely to need to experiment with a few times and distances when you begin. To expose an A4 screen, we suspended the light 16 inches away from the screen for 8 minutes. JMeet the Maker: Nick Morley (with giveaway!).JOn The Course: Creating Life Drawing Mono Screen Prints.Squeegees, Scoop Coaters and Hinge Clamps.2 part diazo w/ 1,000w metal halide - 2 minutes.2 part diazo w/ uv fluorescent bulbs - 6 minutes.2 part diazo w/ 500watt halogen light - 15 minutes.Pre-sensitized w/ 1,000w metal halide - 1 minute.Pre-sensitized w/ uv fluorescent bulbs - 3 minutes.Pre-sensitized w/ 500watt halogen light - 8 minutes.*Not sure where to start? Try plugging in these numbers for step 1 and go from there: If you were burning in 18 second increments, the correct exposure time would be 126 seconds (18x7=126). These estimated time charts are based on known commercial screen printing UV light sources on 305 mesh. For example, if row 4 came out the best, 11-4=7, meaning row 4 got exposed a total of 7 times during the test. Start by checking the suggested exposure time on the product Technical Data Sheet. Lastly, take the number of the best row and subtract from 11.Wash out the screen, allow to dry, and determine which row came out best.Continue moving the paper down and exposing until you have reached the bottom. With Speedballs Diazo System, the maximum allowable time between application of the sensitized emulsion to the screen and the exposure is four weeks at.Expose the screen for the amount of time you came up with in Step 3 again.Move the thick, opaque paper down to where it is covering all but the first 2 rows.Expose the screen for the amount of time you came up with in Step 3.Tape the calculator to screen, and cover all but the first row with thick, opaque paper.Take your new time calculated in Step 2, and divide by 10.Take that amount of time, and multiply by 1.5 (Ex.*Guess how long it will take for your screen to burn (Ex.We understand this math can seem a bit intimidating at first, but just take your time and trust the formulas. Also, be sure to coat all your screens in the same way for consistent burn times.įree Download Calculating Your Exposure Time We found 0 results matching your criteria.įinally, a FREE exposure calculator for anyone to download and use! Simply download the file, print out on a transparency film, and then start calculating your proper screen exposure times! We recommend performing the exposure test on each different mesh count you use for optimal results.
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