Discuss the different types of equipment needed for screen printing. Topics include manual screen printing presses, automatic presses, dryers, folding machines, starter kits and high end machines.
It depends on the emulsion and your set-up.
Get an exposure calculator (step wedge) and do a series of test exposures until you have a solid step 3 on the wedge. You can do it on one screen by shielding areas.
step wedge works great. i used it after a few failed attempts when i first started .. only had 2-3 bad exposures in a year now! its really the only way to ensure a consistent exposure is done
Exposure time 
