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Question about exposure times:I use Ulano EZ Film capillary film http://www.sourceoneonline.com/item.asp?categoryID=4§ionID=27&subSectionID=134&subSection2ID=0&subSection3ID=0&attrCatID=0&attrIDs=0&catID=134&catTab=sub_section&productID=2475What should I expect for exposure time with a LED unit?
For exposure times, one can't say that the times are going to be exactly the same for everyone that uses the same emulsion or carrier device with cap film like this one. I assume that they provide a variety of thicknesses.There are other factors in play as well. For example, some manually coat 1:1 (on all mesh) while others coat different amounts of times for each different mesh size. A company can't say that their exposure times will be exactly X time because of the variables such as being hand coated, can be much different in emulsion thickness from one shop to the next. A 1:1 coated using the sharp edge will be different than a 1:1 coated with the round edge. Bob may hand coat faster and heavier than Sally.Toss that in with those who coat a 110 mesh 1:1 and others do 1:2 and then some 2:2 and 2:3. All one can do is give a good approximate answer based on test and more accurately, would be to provide averages.Capillary film or products like this kind mentioned will take out a variable of thickness assuming you are comparing the exact same mesh threads/% open area and emulsion thickness. I see they also suggest that this can be used with manual emulsion application as well.
Quote from: Dottonedan on August 07, 2014, 12:43:50 AMFor exposure times, one can't say that the times are going to be exactly the same for everyone that uses the same emulsion or carrier device with cap film like this one. I assume that they provide a variety of thicknesses.There are other factors in play as well. For example, some manually coat 1:1 (on all mesh) while others coat different amounts of times for each different mesh size. A company can't say that their exposure times will be exactly X time because of the variables such as being hand coated, can be much different in emulsion thickness from one shop to the next. A 1:1 coated using the sharp edge will be different than a 1:1 coated with the round edge. Bob may hand coat faster and heavier than Sally.Toss that in with those who coat a 110 mesh 1:1 and others do 1:2 and then some 2:2 and 2:3. All one can do is give a good approximate answer based on test and more accurately, would be to provide averages.Capillary film or products like this kind mentioned will take out a variable of thickness assuming you are comparing the exact same mesh threads/% open area and emulsion thickness. I see they also suggest that this can be used with manual emulsion application as well.Agree to all of this. If we want to get really scientific with it, we need to know what mesh brand and color was used for testing, so we know how thick it is to begin with. Then telling the coating method in addition to an EOM value, and THEN how long it took to reach full exposure all the way through. And of course emulsion type.
Just to compare numbers...Starlight 2331SP1400, 156 - white mesh, 2wet over 2wet, round edge scoop coater.28% relative humidity in the drying room. screen dried for 24 hours. 82 degrees F.I'm at 38 seconds for what seems to be a perfect burn.
I've got glass... would think you'll save some seconds off....we don't do a lot of long run discharge... but I can say that it held up just fine to 500 pcs last week with Rutland White Plus....-- and the screen was still nice and strong when cleaning it off after the print run.so I have no doubt that it would have held up longer if needed.
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Topic: LED exposure times (SPLIT from Anatol LED) (Read 1947 times)
