 Exposing a screen in sunlight?
I am trying to expose a 40" screen. It will not fit on my exposure unit by a long shot. I did a test run using small screens, exposing them using different light sources. On the first, I used a 400w halogen shop light, exposing a 230 mesh screen for 10 minutes. Every bit of emulsion washed off. On the next, I exposed screens in direct sunlight, one for 1.5 minutes, which did not pick up any half tones, and only washed out the center of the text/graphics. The next, I exposed for 10 minutes, which nothing washed out. That was all of the screens I had coated, so I couldn't run any more tests. I wanted to know if anyone else has exposed screens in direct sunlight, and if so, what was the best exposure time? Another printer in town has an arc welder they use to expose screens, but they said results are variable, and I would rather expose the screens myself than carry around a 40" screen across town to their shop.
__________________ Unik Ink Specialty Printing-oversize & all over printing
Impressions 2008 Awards winner- Manual Textile Screen Printing
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