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TRADE: LED for 3140

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gotshirtz001:
Still looking to trade? I just sold some equipment to a guy in Boise. Still needs an exposure... I have a 3140, he wants LED. We can 3-way.


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Dottonedan:

--- Quote from: ABuffington on June 20, 2019, 12:07:19 PM ---Emulsion has a maximum sensitivity and needs to be in balance to other components.  We can make it resist water or solvents, and (harder)tweak it to make co solvent resistance. How you make your screens is crucial, in the end if you don't apply enough energy to the sensitizer during exposure you wind up with a partially cross linked stencil.  If there are un cross linked components, they are easily affected by water and will melt and breakdown. Quite often we fall into the trap of inspecting screens with our eyes and not a proven recipe, it looks good, has a great image, but breaks down with water base or discharge or HSA.  The recipe isn't about the image, it's about the quality of the exposure first and then the image next.  They are two very different areas of screen making.   So even with overexposure using an LED, you are applying a narrow wave length of the available UV Spectrum, whereas with MH you can get multi spectral bulbs that have more wavelengths at a much higher wattage at the source.  I can get good results with LED and post exposure with T9, but hit that same screen with an 8k Olite or a Tri Light 6k, a new bulb, proper exposure time (right up to over exposure)  and it can print long runs without hardeners and T9 will reclaim like butter.  Water base screens require an entirely different screen recipe than what you would use for plastisol.  Extra prep, longer dry times before exposure and before press set up, maximum high wattage multi spectral light, proper EOM, all help and it does require a bit more effort in screen making.  I can get great screens from LED, and the speed of image and exposure helps high volume shops, so you can make this work with LED, it just takes post exposure and the sun is the best if available.  Just realize there are stronger lamps that can make stronger screens, but either way can achieve success, the key is focus on getting maximum cross linked exposure.

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Great post!  Well balanced with accurate information.

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