It appears you may be looking for information on exposure or burning screens. Bu i tried different times of exposure from 8 to 15 to 20 minutes, and already with 8 minutes the image will appear on the screen. You can measure your lamp with two exposures using a Stouffer 21 Step Scale to measure the stencil hardness, then refine your exposure with an exposure calculator. I dont know if its the emulsion that is the problem, or the screen, or the exposure. These estimated time charts are based on known commercial screen printing UV light sources on 305 mesh. it will depend on the intensity of the uv light. Start by checking the suggested exposure time on the product Technical Data Sheet. Once you see it darken considerably it has been should only take 2-3 minutes depending on how strong the sun it. This lightweight and portable LED Lamp is a must for any screen printer Compatible with any photo emulsion, Speedball's LED Lamp delivers a consistent exposure every time along with a significantly longer life span than the traditional 250W photoflood alternatives. From inks, modifiers and fluids to squeegees & frames, Speedball leads the industry in creating products that. 1.What you need: a screenWhile I used a ready-made Speedball frame for this project, making your own screens is cheaper, and not hard to do. Photo emulsion is best for creating detailed or photographic type stencils for screen printing. (we have made test strips ranging from 2-18 minutes.). i use a 500w halogen setup about a foot away from the screen, last time i used speedball i exposed the screens for 7 mins with the same set up and didn’t. So Ive been having problems from the start using Speedball emulsion where it will start to wash out in areas its not supposed after the image is burned on no matter how long we seem to expose it for. When the stencil doesn't hold in the mesh, it didn't get enough exposure. As a pioneer in the formulation and manufacturing of safe and high-quality screen printing supplies, Speedball proudly provides screen printers of all ages and skill levels all that’s needed to explore their creative processes. i let them dry overnight in a dark closet, i’ve tried a couple different exposure times and even purposefully over exposed the screens and still end up having the emulsion fall out. Screen makers can only expose one side of the stencil, so it is important for the UV energy to move through the stencil, all the way to the back, where the squeegee blade will rub the stencil where it is weakest. You block UV energy with a positive during exposure so the image area dissolves when you develop the stencil with water. Invisible UV energy reacts with emulsion sensitizer and hardens the stencil so it won't dissolve with water and rinse down the drain. It is the primary job of the screen maker to learn how to judge exposure.
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