Comments on: Screen Printing-Exposure Time For Photo Emulsion Coated Screens http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html Mon, 30 Jan 2012 01:23:21 +0000 hourly 1 http://wordpress.org/?v=3.1.3 By: Riley http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-16113 Riley Wed, 29 Jun 2011 16:27:23 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-16113 surprisingly, it worked perfectly for me! I put my screen under my 40W lamp in the complete dark and went to bed, set my alarm for a few hours and got up and covered it up and turned off the lamp. rinsed it out this morning and it worked great, but i really do need to get the proper supplies surprisingly, it worked perfectly for me! I put my screen under my 40W lamp in the complete dark and went to bed, set my alarm for a few hours and got up and covered it up and turned off the lamp. rinsed it out this morning and it worked great, but i really do need to get the proper supplies

]]> By: Rob http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-16107 Rob Wed, 29 Jun 2011 10:52:21 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-16107 A 40w bulb will take a long time. Chances are you will have other light in the roon, like sunlight coming through the windows unless you always expose your screens in a dark roon with just the 40w bulb. I suggest you get a stronger bulb, and go through the steps I outlined above. A 40w bulb will take a long time. Chances are you will have other light in the roon, like sunlight coming through the windows unless you always expose your screens in a dark roon with just the 40w bulb. I suggest you get a stronger bulb, and go through the steps I outlined above.

]]> By: Riley http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-16105 Riley Wed, 29 Jun 2011 07:45:17 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-16105 i am trying screen printing for the first time and unprepared and eager to get my project done, i only have a 40W bulb! any suggestions and exposure time and distance? im not good with these things! thank you! i am trying screen printing for the first time and unprepared and eager to get my project done, i only have a 40W bulb! any suggestions and exposure time and distance? im not good with these things! thank you!

]]> By: Rob http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-15699 Rob Thu, 12 May 2011 11:06:46 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-15699 I would raise the light, and increase exposure time. The spot closest to the light will get more exposure than the parts farther away. Take it to an extreme level. Think of the light an inch from the screen. The center would be an inch away. The outsides might be 6 or 7 or more inches away. the center would get the brightest light. So it would be overexposed while the outsides would be underexposed. Moving the light farther away, will even out the exposure. And you really only need to coat one side of the screen. The more even the coating the better. Too thick may cause exposure problems. I would raise the light, and increase exposure time. The spot closest to the light will get more exposure than the parts farther away. Take it to an extreme level. Think of the light an inch from the screen. The center would be an inch away. The outsides might be 6 or 7 or more inches away. the center would get the brightest light. So it would be overexposed while the outsides would be underexposed. Moving the light farther away, will even out the exposure.
And you really only need to coat one side of the screen. The more even the coating the better. Too thick may cause exposure problems.

]]> By: Stephanie http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-15691 Stephanie Thu, 12 May 2011 02:37:19 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-15691 I just tried photo emulsion for the first time. Overall, I'm really pleased, but on both my screens I think I had a problem with glare from the 150w light bulb. In both cases, I had two transparencies on top of the emulsion, but under the glass. I measured the height of the bulb to 12 inches and set a timer for 45 minutes (following directions). Most of the blocked emulsion washed out both times, but on both screens (exposed separately) I had a circle of over exposure that seemed to be a spot of 'glare' where the light would've been most direct. I was able to use a fine bottle brush, time, elbow grease, and my stubbornness to fix it but how can I avoid the problem in the future? I worry about lessening the exposure time since the rest of the screen seemed to be perfect. My fiance suggested glare resistant glass from a hobby shop. Opinions? I just tried photo emulsion for the first time. Overall, I’m really pleased, but on both my screens I think I had a problem with glare from the 150w light bulb. In both cases, I had two transparencies on top of the emulsion, but under the glass. I measured the height of the bulb to 12 inches and set a timer for 45 minutes (following directions). Most of the blocked emulsion washed out both times, but on both screens (exposed separately) I had a circle of over exposure that seemed to be a spot of ‘glare’ where the light would’ve been most direct.
I was able to use a fine bottle brush, time, elbow grease, and my stubbornness to fix it but how can I avoid the problem in the future? I worry about lessening the exposure time since the rest of the screen seemed to be perfect. My fiance suggested glare resistant glass from a hobby shop. Opinions?

]]> By: Rob http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-15314 Rob Sun, 27 Mar 2011 01:31:51 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-15314 That's the problem with using sunlight. There is a lack of control. Unless you have a lightmeter or something, you can't really tell how much sun the screen is getting. It sounds like your screen was overexposed a little bit. Yeah, a light takes longer, but you have more control over the exposure. That’s the problem with using sunlight. There is a lack of control. Unless you have a lightmeter or something, you can’t really tell how much sun the screen is getting. It sounds like your screen was overexposed a little bit. Yeah, a light takes longer, but you have more control over the exposure.

]]> By: Rick http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-15313 Rick Sun, 27 Mar 2011 01:05:39 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-15313 Using bright sunlight to expose the Speedball emulsion worked well in Palm Springs, CA. It took me a few tries, but Ken was right, 60 seconds was all it needed at 12:00 noon. The emulsion was still a bit difficult to wash completely clean. So I tried tipping the screen reclaimer bottle into a soaking wet rag and gave one quick rub over the stuck-on area then immediately sprayed with water. It loosened the clogged areas without destroying the stencil. Try it at your own risk, but after four wash-outs I was desperate to get it done. Using bright sunlight to expose the Speedball emulsion worked well in Palm Springs, CA. It took me a few tries, but Ken was right, 60 seconds was all it needed at 12:00 noon. The emulsion was still a bit difficult to wash completely clean. So I tried tipping the screen reclaimer bottle into a soaking wet rag and gave one quick rub over the stuck-on area then immediately sprayed with water. It loosened the clogged areas without destroying the stencil. Try it at your own risk, but after four wash-outs I was desperate to get it done.

]]> By: SAMLAMP http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-14500 SAMLAMP Mon, 10 Jan 2011 16:47:41 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-14500 i use solar and it takes 7-10 mins.in ghana i use solar and it takes 7-10 mins.in ghana

]]> By: Rob http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-14484 Rob Tue, 04 Jan 2011 12:01:51 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-14484 For a larger screen, you will probably have to back to light off. You want to make sure the edges of the screen aren't signicantly farther from the light source than the center. Since the light will be farther away, you will need to increase the exposure time. Follow the steps I did in this article. For a larger screen, you will probably have to back to light off. You want to make sure the edges of the screen aren’t signicantly farther from the light source than the center. Since the light will be farther away, you will need to increase the exposure time. Follow the steps I did in this article.

]]> By: josh http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-14481 josh Tue, 04 Jan 2011 01:44:08 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-14481 so i got a bigger screen and image bout 11x14 i have the 150 watt bulb and im trying to determine exposure time last screen i did was a smaller kit size screen and i exposed it for 20 min at 12 inches an it worked great any ideas? so i got a bigger screen and image bout 11×14 i have the 150 watt bulb and im trying to determine exposure time last screen i did was a smaller kit size screen and i exposed it for 20 min at 12 inches an it worked great any ideas?

]]> By: Rob http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-14098 Rob Wed, 10 Mar 2010 22:26:25 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-14098 Dave, when i spray out the screens after exposure, I will have the spray nozzle on shower, and spray both sides. Then I will focus on one side, and spray it with the shower. This will get most of it clear. If there is trouble spots, I will go to flat spray, and spray a little more intensly. As for water temp, I will use cold to luke warm water. Don't use hot water as it seems to remove emulsion faster and might wreck your exposed image. Dave, when i spray out the screens after exposure, I will have the spray nozzle on shower, and spray both sides. Then I will focus on one side, and spray it with the shower. This will get most of it clear. If there is trouble spots, I will go to flat spray, and spray a little more intensly. As for water temp, I will use cold to luke warm water. Don’t use hot water as it seems to remove emulsion faster and might wreck your exposed image.

]]> By: dave http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-14097 dave Wed, 10 Mar 2010 20:39:12 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-14097 Does anyone have a comment about washing out the screen after exposure. One-side wash, both sides - light pressure - harder pressure - water temp- etc... I really appreciate any advice... artist communities like these are our last resort from big-boxes. Does anyone have a comment about washing out the screen after exposure. One-side wash, both sides – light pressure – harder pressure – water temp- etc…

I really appreciate any advice… artist communities like these are our last resort from big-boxes.

]]> By: Phil http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-10524 Phil Sun, 06 Jan 2008 10:05:49 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-10524 Using the Diazo photo emulsion, I took a cue from the instructions that came with the kit and picked up a BBA 250 watt photoflood. I exposed a 10x14" screen for ten minutes with the bulb twelve inches away. The image washed out almost perfectly, save for a couple of segments of some very thin lines. I'm assuming I could have exposed it slightly longer. In any case, I picked up the the photoflood for less than ten dollars at a camera shop. Seems to do the job nicely. Using the Diazo photo emulsion, I took a cue from the instructions that came with the kit and picked up a BBA 250 watt photoflood. I exposed a 10×14″ screen for ten minutes with the bulb twelve inches away. The image washed out almost perfectly, save for a couple of segments of some very thin lines. I’m assuming I could have exposed it slightly longer. In any case, I picked up the the photoflood for less than ten dollars at a camera shop. Seems to do the job nicely.

]]> By: Rob http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-8830 Rob Wed, 22 Aug 2007 11:08:20 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-8830 Sunlight is usable, BUT unpredictable. The times you used today, may not work later. There are too many variables such as season, air polution, clouds, time of day, etc. The time needed at noon, may be less than what is needed at 6pm. Just be prepared for some screens that don't turn out as well as you would have liked. Sunlight is usable, BUT unpredictable. The times you used today, may not work later. There are too many variables such as season, air polution, clouds, time of day, etc. The time needed at noon, may be less than what is needed at 6pm. Just be prepared for some screens that don’t turn out as well as you would have liked.

]]> By: Ken http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-8824 Ken Wed, 22 Aug 2007 00:24:08 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-8824 I just did my first screen with Speeball's Diazo kit. I used direct sunlight (no haze, clouds, etc.) for about 50 seconds. It was slightly underexposed because the wind moved my positive (plexi I had was larger than the screen) but I had my timer set for 60 seconds. I think 60 would have been a little better. Anyway, it worked! I have a screen drying as I type this. I will be cutting a piece of plexi for the frame I have and make a backboard with black felt that will fit it as well, then I can fix everything in place next time. I just did my first screen with Speeball’s Diazo kit. I used direct sunlight (no haze, clouds, etc.) for about 50 seconds. It was slightly underexposed because the wind moved my positive (plexi I had was larger than the screen) but I had my timer set for 60 seconds. I think 60 would have been a little better. Anyway, it worked! I have a screen drying as I type this. I will be cutting a piece of plexi for the frame I have and make a backboard with black felt that will fit it as well, then I can fix everything in place next time.

]]> By: Rob http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-6281 Rob Tue, 15 May 2007 02:47:41 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-6281 I use Diazo Photo Emulsion by Speedball. I buy it in the larger 26.2 ounce jars. But there are less expensive smaller-sized jars available. Between coating screens, I store it in the refridgerator. I use Diazo Photo Emulsion by Speedball. I buy it in the larger 26.2 ounce jars. But there are less expensive smaller-sized jars available. Between coating screens, I store it in the refridgerator.

]]> By: Marissa http://www.screen-printing-t-shirts.com/screen-printing-exposure-time-for-photo-emulsion-coated-screens.html/comment-page-1#comment-6279 Marissa Tue, 15 May 2007 00:40:51 +0000 http://www.screen-printing-t-shirts.com/exposure-time.html#comment-6279 What kind of emulsion are you using? Do you have a favorite brand that is most effective with your light and timiing? What kind of emulsion are you using? Do you have a favorite brand that is most effective with your light and timiing?

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