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Discuss the various aspects of screen printing. Inks, speciality printing, print locations, durability, etc.



Yellow Mesh vs. White Mesh Exposure Time

 
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Old September 16th, 2007 Sep 16, 2007 10:58:30 AM -   #1 (permalink)
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Default Yellow Mesh vs. White Mesh Exposure Time

I did a search on here and I found 2 exactly opposite answers to my question.

I usually burn a really nice screen with white mesh (140 mesh cout) in about 12.5 minutes.

I need to find how much time will it take for a yellow, (230 mesh count), screen under the same light source to burn. I saw that yellow will take about 125% longer than white.

Then I read another post that said the yellow mesh will burn quicker than white.

So, I'm not sure which one is correct.

Thanks!

Ken
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Old September 16th, 2007 Sep 16, 2007 11:11:18 AM -   #2 (permalink)
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Default Re: Yellow Mesh vs. White Mesh Exposure Time

I burn yellow mesh and white meshes at the same time. I have yellow mesh for anything above 140. Below 140 is white. White mesh allows the light to bounce around and you might not get as sharp as burn.
 
Old September 16th, 2007 Sep 16, 2007 5:04:21 PM -   #3 (permalink)
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Default Re: Yellow Mesh vs. White Mesh Exposure Time

You burn yellow mesh, generally, 125% of the time that you would burn white, ie 25% longer, NOT 125% longer. So, unless my math is off, you should burn your yellow screens for 15 minutes with your set up.
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Old September 16th, 2007 Sep 16, 2007 5:42:53 PM -   #4 (permalink)
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Default Re: Yellow Mesh vs. White Mesh Exposure Time

just tried 15 mins and worked like a charm!

Thanks for saving me some time and headache!
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Old September 17th, 2007 Sep 17, 2007 4:20:29 PM -   #5 (permalink)
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Default Re: Yellow Mesh vs. White Mesh Exposure Time

to be safe, i go double. it might be overkill!
 
Old September 17th, 2007 Sep 17, 2007 4:51:51 PM -   #6 (permalink)
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Default Re: Yellow Mesh vs. White Mesh Exposure Time

i did 125% and it worked great.

maybe it was beginers luck?
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Old September 17th, 2007 Sep 17, 2007 5:05:00 PM -   #7 (permalink)
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Default Re: Yellow Mesh vs. White Mesh Exposure Time

Yellow takes more time but a higher mesh count takes less.
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Old September 17th, 2007 Sep 17, 2007 5:17:19 PM -   #8 (permalink)
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Default Re: Yellow Mesh vs. White Mesh Exposure Time

If you go double, then you're likely to overburn the screen and not get detail to come out. If you go double and you don't have major problems washing out the screen then you might actually be underburning with your normal white mesh times.
125% for yellow is a general rule that will work. If it's a substantially high mesh count, a little less will work. If you ever have to burn an orange screen, they should generally go for 150% of the time.
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Old September 17th, 2007 Sep 17, 2007 8:16:26 PM -   #9 (permalink)
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Default Re: Yellow Mesh vs. White Mesh Exposure Time

I must have a stronger light (mercury) I use 2 min 45 Sec to 3 Minutes tops for exposure time. I am using Ulano presensitized emulsion. Is the 12 to 15 Min. for flourescent?
 
Old September 17th, 2007 Sep 17, 2007 10:44:17 PM -   #10 (permalink)
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Default Re: Yellow Mesh vs. White Mesh Exposure Time

jeff- the time vill always vary depending on the light or Uv output source.. you just have to find the times that work with your particular setup

i usually don't change my times depending on mesh color... I was under the impression that a higher mesh count takes less time because the smaller gaps in the mesh retain less emulsion
 
Old September 18th, 2007 Sep 18, 2007 2:45:03 AM -   #11 (permalink)
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Default Re: Yellow Mesh vs. White Mesh Exposure Time

Quote:
Originally Posted by truckmancarr
I must have a stronger light (mercury) I use 2 min 45 Sec to 3 Minutes tops for exposure time. I am using Ulano presensitized emulsion. Is the 12 to 15 Min. for flourescent?
Yes, you have a better set up, thus, quicker exposure time.

I just use a basic 500 watt halogen light that I received in a kit. Nothing fancy yet.
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