April 28, 2015
Researchers:Kevin Pomerleau/ Daniel Chiaccio
Room Temperature: 65 degrees F
Materials: Macdermid Plus 8,000 Universal Resistant Emulsion, 17x 15″ screen, Speedball Screen Printing Ink with extender, Exposure unit, Opaque Black Trash Bag, 2.5 lb paper weights
Abstract: To see if the length of drying time of the unexposed emulsion on a screen effects the amount of detail in the final print.
Procedure: We began by coating a 17×15″ 195 white mesh count screen with the Macdermid Plus 8,000 Universal Resistant Emulsion on both sides with a 14″ scoop coater. We then let the emulsion dry for 45 minutes under proper ventilation in our dark room. After the screen had dried, we exposed a pre made transparency using both halftone and text (the same transparency from test no. 1) by placing the transparency onto the exposure unit with the coated screen on top of that (emulsion to emulsion), then covering the entire unit with an opaque black trash bag and compressing the entire structure with 1.5 lb paperweights placed on top. We then set the unit for five minutes and exposed the screen.
Conclusions: Drawing on the conclusions we made during test no. 1, we discovered that the more time the emulsion had to dry prior to exposure caused a variation in the emulsion’s color after exposure. Unlike screen no. 1, who’s emulsion turned a light teal color, screen no. 2 turned into a dark blue color. The image itself printed clearly, but with almost the same amount of mid tone information at test no. 1. We concluded that although the final prints were relatively similar, the final dark blue color of emulsion was easier to work with in terms of washing the image out after exposure and seemed more secure during printing when in in contact with the ink.