How to Post Expose your Screen Printing Stencils
Durable stencils are incredibly important to the integrity of your print. A strong stencil is required for all printing however it is especially important when you have a long print run or are printing with water-based inks . During long print runs the emulsion can wear down causing your print edges to be less crisp. Today we discuss when to use post exposure and how you can use post exposure to strengthen your emulsion. What is post exposure? First let’s do a small recap on the processing of exposing emulsion, understanding this process will help you to understand how post exposure works. Exposing emulsion is when the emulsion coated onto a screen-printing frame is exposed to light, the light hardens the emulsion anywhere the light touches the screen. The hardened emulsion on the screen does not rinse out, what remains is your stencil. Post exposure is exposing the screen again to light after the screen has already been exposed rinsed and dried. The purpose is to strengthen or t...