Welcome to the forums, as well as the screen printing world!
Here's a few pointers on exposure times:
- If you're using a fluorescent light exposure unit, then I recommend about 2 minutes 30 seconds for exposure time.
- If you're using a metal halide unit, I usually do about 30 to 45 seconds.
Exposure time can also vary depending on the type of film positives you're using - if you're using transparencies, the above times should be fine, but if you're using vellum in a laser printer, the exposure time may need to be lowered slightly because too long in the unit, and the sheet of vellum will begin to expose on to the screen. However, back when I was at the first screen printing shop I worked in, we used vellum in a laser printer and I exposed screens for 2:30 all day long with never a problem. Even rinsed them with a pressure washer.
Any questions, don't hesitate to ask!
Here's a few pointers on exposure times:
- If you're using a fluorescent light exposure unit, then I recommend about 2 minutes 30 seconds for exposure time.
- If you're using a metal halide unit, I usually do about 30 to 45 seconds.
Exposure time can also vary depending on the type of film positives you're using - if you're using transparencies, the above times should be fine, but if you're using vellum in a laser printer, the exposure time may need to be lowered slightly because too long in the unit, and the sheet of vellum will begin to expose on to the screen. However, back when I was at the first screen printing shop I worked in, we used vellum in a laser printer and I exposed screens for 2:30 all day long with never a problem. Even rinsed them with a pressure washer.
Any questions, don't hesitate to ask!
