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![]() ![]() Whereas an OVER-EXPOSED screen will be difficult to wash out and you will see the design starting to blur on the edges. You can also use our FREE exposure calculator which can be used on most exposure units.ĮXPOSURE CALCULATOR FOR SCREEN PRINTING A4Īlthough our exposure calculator is good, sometimes it’s easier to just go for it! Try exposing your screen for 4 minutes… When you wash it out, take note of what is happening and adjust your exposure time from your results.Īn UNDER-EXPOSED screen will be slimy and will wash away easily. When you understand the limitations of your exposure unit then you can start to dial in your exposure method and time. Do you have LED bulbs or Metal Halide bulbs? Your light source may work better with different types of emulsion. ![]() The best tip is to understand exactly how your exposure unit is going to expose your screens, for example, does your unit have a vacuum blanket attached? If not, you will need to find something to weigh down your screen onto the glass – You must create perfect contact between the mesh, acetate and glass for a good exposure.Īnother thing to take into consideration is the light source of your exposure unit. There are so many different types of exposure units available. Wait for the screen to be 100% dry before going to expose. Once your screen is coated, make sure to dry it flat (flat side down) and in complete darkness. This means applying yellow UV blockers on your lightbulbs to stop the UV slowly exposing your emulsion prematurely. When coating your screens you should do this in a ‘light safe’ area. Once you have mixed your emulsion you need to leave it in a dark cool place – if you need some direction on how to properly mix your emulsion, check out our tutorial video here : How to mix photosensitive emulsion. We often use Screen Sol QT – Use our discount code CRP5 for some money off! We prefer the dual cure emulsion which comes in 2 parts. You need to get your hands on some good, professional emulsion. If you can get this correct, then your exposure has a better chance of success. This tip isn’t just about the TYPE of emulsion but the entire process of mixing, coating and drying your screens. We can also print your film positives for you! Check it out below Watch the course for FREE by signing up to Skillshare for your first months free membership. Chapter 1 explains our film positive method in full. If you want more information on the method we use to create dense acetates specifically for screen printing, check out our course here : How to expose a screen for screen printing. We also converted our printer to have an all black system for best results. To achieve solid black acetates we use a wide format, Epsom inkjet printer in conjunction with a rip software called ‘Acurip’. If you want to achieve a good exposure, stop cutting corners and put the work into perfecting your positives! If you’re thinking “can’t I just double up my positives to make it denser?” Then you’re not getting the point. Your positives need to be 100% dense black ink. This is the most important part of your exposure! If you have good film positives, then you’re likely to have a good exposure. Here are our 5 top tips for exposing screens with UV light and photosensitive emulsion. If you can perfect your preparation, then your exposure time will follow naturally. We have all asked the question only to find the most frustrating truth, that your exposure time is unique to your set up.Įxposure time is not the only factor to take into consideration. Screen exposure time is one of the most asked questions with new screen printers. ![]()
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