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

exposing screen



 
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Old May 2nd, 2008 May 2, 2008 11:42:32 AM -   #1 (permalink)
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Post exposing screen

Im going to be using a 500 watt halogen worklight to expose my screen... when doing this... so i need to take of the uv filter class? or keep it on?
 
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Old May 2nd, 2008 May 2, 2008 3:12:58 PM -   #2 (permalink)
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Default Re: exposing screen

Remove the glass. It is, after all, the UV light that exposes your emulsion. Since Halogen lights are probably the poorest source of UV light, to put a filter in front of it is like not turning it on at all.
 
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Old May 2nd, 2008 May 2, 2008 6:46:43 PM -   #3 (permalink)
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Default Re: exposing screen

Thank you
would that explain why some of the emulsion that was away from the center of the light was.. is washed out as well
 
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Old May 2nd, 2008 May 2, 2008 6:48:24 PM -   #4 (permalink)
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Default Re: exposing screen

i meant to say
i rinsed out the screen and where the center of the light was is all hardened.. the other end of the screen is very slimmy and not dried
 
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Old May 2nd, 2008 May 2, 2008 10:33:38 PM -   #5 (permalink)
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Default Re: exposing screen

It sounds like your light is too close to the screen and created a "hot spot".
 
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Old May 2nd, 2008 May 2, 2008 11:26:17 PM -   #6 (permalink)
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Default Re: exposing screen

If part of your screen was "slimey and not dried" wouldn't that mean your not drying your screen enough before exposing it?
 
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Old May 2nd, 2008 May 2, 2008 11:37:10 PM -   #7 (permalink)
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Default Re: exposing screen

it was dry then started to wash off and have a slimmy feeling when i began to rinse .. i dont kno exactly what it was from but i believe maybe under exposure because of the glass covering the halogen light?
 
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Old May 3rd, 2008 May 3, 2008 7:21:17 AM -   #8 (permalink)
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Default Re: exposing screen

"Slimy" and rinsing out easily is a sign of underexposure. I think you were telling us the center of the screen was hard and the surrounding area rinsed out too easily & had a slimy feeling. It sounds like you are having a dual problem. #1, a hot spot caused by having the halogen light too close to the screen and "cooking" the emulsion (remember, halogen lights put off more energy in the form of HEAT then they do light, that's why halogen bulbs are used as burners or heatplates in modern stoves), and #2, not enough UV light which could have been caused by leaving the glass plate in front of the halogen bulb, or if the plate was already removed, not exposing the screen long enough (underexposure). Remove the glass, back the bulb away from the screen to 1˝ times the diagonal measurement of the screen. Do a step wedge test to determine proper exposure time. You can do a search on this board and other screen printing boards for how to do a step wedge test.
 
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