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Having problems with emulsion and exposure

 
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Old November 14th, 2015 Nov 14, 2015 7:02:22 AM -   #1 (permalink)
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Default Having problems with emulsion and exposure

Hi everybody.

I'm fairly new to the forum and the art of screen printing as well. This forum has been a great help for me in the process of learning, so i thank you for that.

When i wash out the image exposed in my frames i often get this invisible blocker laying where the image has been exposed. I've done an exposure test to pinpoint my best exposure time and tried everything i know that could be making this.

Does anybody know what i'm doing wrong here? Please see the attached images.

I'm using an emulsion called Azocol Poly Plus S-RX.

Thank you very much.
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File Type: jpg IMG_2093.JPG (3.62 MB, 34 views)
File Type: jpg IMG_2094.JPG (1.52 MB, 32 views)
 
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Old November 14th, 2015 Nov 14, 2015 7:44:53 AM -   #2 (permalink)
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Default Re: Having problems with emulsion and exposure

This is a clear carrier for the emulsion. Normally, adequate rinsing will remove it. After the screen dries, the best chemical for removing it is plain old spit. Spit on your finger, rub the offending area, and it's gone. God Bless.
 
Old November 15th, 2015 Nov 15, 2015 1:38:21 AM -   #3 (permalink)
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Thank you.
Should i wash them out with a power washer or is it good enough with only a garden hose? Been trying both, and both have ups and downs in my opinion.
 
 
Old November 15th, 2015 Nov 15, 2015 2:04:52 AM -   #4 (permalink)
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Default Re: Having problems with emulsion and exposure

Do u rinse em str8 away in the DARK ???
 
Old November 15th, 2015 Nov 15, 2015 2:17:46 AM -   #5 (permalink)
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Default Re: Having problems with emulsion and exposure

I put it in a homemade washout booth straight away yes. But i have some lightning on the backside of the booth to see what i'm doing.
 
Old November 15th, 2015 Nov 15, 2015 3:38:44 AM -   #6 (permalink)
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Default Re: Having problems with emulsion and exposure

Quote:
Originally Posted by Kallerebell
Hi everybody.

I'm fairly new to the forum and the art of screen printing as well. This forum has been a great help for me in the process of learning, so i thank you for that.

When i wash out the image exposed in my frames i often get this invisible blocker laying where the image has been exposed. I've done an exposure test to pinpoint my best exposure time and tried everything i know that could be making this.

Does anybody know what i'm doing wrong here? Please see the attached images.

I'm using an emulsion called Azocol Poly Plus S-RX.

Thank you very much.
that is haze from the emulsion. If you have your screen coating and burning at the optimum for what you do, then just be extra careful when washing out your screen. do not use pressure washer, garden hose is fine. Use a trigger handle sprayer set to shower pattern. Spray out the image from both sides but primarily squeegee side, then change to a gentle setting (or don't use full force of water) to very gently flow some water down from top of screen on both sides. This is to rinse off the haze without disturbing the set emulsion.
If you see any remaining haze as the screen dries, it can be blotted out (from the print side) with a damp (not wet) lint-free rag or shop wipe.
 
Old November 15th, 2015 Nov 15, 2015 6:00:00 AM -   #7 (permalink)
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Default Re: Having problems with emulsion and exposure

We don't use a power washer at all, like Artlife said, just the pressure from the tap with a garden hose attachment is plenty to wash out your unexposed emulsion.
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Old November 15th, 2015 Nov 15, 2015 7:20:17 AM -   #8 (permalink)
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Thank you very much you guys. I'm gonna give it another go tomorrow.
 
Old November 15th, 2015 Nov 15, 2015 11:07:48 AM -   #9 (permalink)
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Default Re: Having problems with emulsion and exposure

Properly exposed screen can take a power washer. I don't normally use one due to the fact I use photopolymer emulision 99% of the time. I do use power washer on diazo. Then after wash out I do a good flood rinse both sides. I also use a shop vac if blow mode and quickly remove the water from screen soon as possible.

I didn't look up your emulsion but sounds like is a dual cure. The "invisible" film you getting is left over diazo. If you are rinsing the screen well and your getting the film possible under exposure. What type of exposure unit are you using? Some of the weaker exposure light sources specificly halogen and blacklight units struggle to fully expose the screen and especially if you have a thick stencil. It will cure the emulsion about 70-90% which allows the screen to washout and if using a21 step Stouffer strip will still washout a 7 but the back side still get diazo slim.

Also if you pat drying the screen always start from the center working in a circle to the outside. The outer edges where the scoop coater leaves lines will be soft and can leave the diazo slim.
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Old November 15th, 2015 Nov 15, 2015 12:11:28 PM -   #10 (permalink)
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Default Re: Having problems with emulsion and exposure

After you wash out your image you need to take a few paper towels and fold them and dab out all the water from the image, and then dry the screen laying flat so that water can't seep back over the image. If we don't do this at work we get the same problem. It really only takes a second and saves the hassles of going back and hosing those spots out again.
 






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