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Need help with wash out. Don't know what's the problem. PICS included!

2032 Views 8 Replies 6 Participants Last post by  Celtic
Hi everyone,
First and foremost, I'm really thankful for all your help! Now onto the problem. I'm having a problem with washing my image out. Here's what happenedIMG_0015 | Flickr - Photo Sharing! IMG_0016 | Flickr - Photo Sharing!
When I tried washing the image out, the emulsion around the image started to wash out as well.

Here are the steps I took:

1. clean and degrease screen.

2. used "Ulano 925WR" emulsion to coat 1 side of the screen (FRONT). *Note: I had some overlapped emulsion in front because my screens are 20x28 and my scoop coater is 10 inches.

3. dried the screen standing up. *As stated in my early post, I don't have the room for a drying rack.

4. burnt the image using 1 "500 watt" halogen light. *I aimed it directly at the center of the screen, ~18inches above. my designs were held down by a huge piece of tempered glass, backed with foam and black cardboard.

5. exposed the screen approximately 7.5min.

6. started washing the screen (with garden hose) for about 2 min. and there wasn't any progress on the image washing out. I've been having a lot of problems with this. Emulsion seemed to be really stubborn.

7. decided to pressure wash the screen. images turned out good, seconds into pressure washing. That's when emulsion around the image started to come out.

I know it's a lot to read, but I really need help. Where did I go wrong? Did it start when I did a single coat of emulsion on one side? Was it my drying technique? Was it the fact I used a pressure washer to wash out my image? Any help is greatly appreciated! Mahalo.
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First, I am, BY NO MEANS, a pro. (I just play one in my shop). If I'm wrong, someone will chime in. :D

**2 coats of emulsion-- 1:1. Coat the shirt side first-- (the flat side), then coat the squeegee side. (The side you use the squeegee) This gives for better coverage, and a more even film of emulsion. Which is necessary for proper burning and getting a nice, crisp image.

**ALWAYS dry your screen horizontally so the emulsion can settle properly. When drying, always dry shirt side down. I understand the lack of space, but these things are essential to getting a good screen developed.

**Scoop coater. Ok....your screen is 20X28, coater is 10". I would rotate the screen to a landscape position and do 2 passes, side by side, with as little overlap in the middle as possible. (Just my .02 on that one) I think you're less likely to have runs, overlapping marks where it will take more development time, less buildup which would increase exposure time, too. (Figuring 2 passes will cover your 28" long screen--giving about 2" width on either end for frame, that means you now have approx 24" to cover. You can lose about an inch on each end of the mesh, won't need that space anyways--that leaves you with about 22" to cover in 2 passes---doable, IMHO)

**Was your emulsion completely dry when you started the exposure?? Are you sure....? I've made that mistake and ruined the image because the emulsion wasnt properly dried and cured and ready to be burnt. Again, JMHO. Keeping in mind that if it's very humid, it will take longer to dry, etc.

** Sounds like under exposure. With 1-500w halogen, at that distance, should've been longer. I use 2-1000W worklights, placed about 10-12" from the image, it takes about 3-3 1/2 mins.

** Pressure washing *shouldn't* wash out your emulsion, IF properly cured. I run water (no pressure) over the screen, both sides, let it sit for about 5 minutes, then start rinsing. Sometimes this is enough to wash the image out. Sometimes I DO actually use the pressure.

I saw your post about your drying situation, and LOVED andimill's response. Not difficult, not costly and once they are dry, THEN cover and stand them up.

Good luck! :eek:

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  1. OK, hopefully you used the right product.
  2. Always coat both sides. Coat the shirt side first, then the squeegee side. unless your designs are bigger than 10" why try to coat the whole screen? Just coat the center, and you won't have thick emulsion overlapping, which will cause an uneven ink deposit on your shirts.
  3. Don't need a drying rack. Find 4 things that are the same size (dice, pop cans, beer bottles, cups), and put one under each corner of your screen on a flat surface IN THE DARK. Let dry. Again avoiding thick drips in the emulsion.
  4. Sounds about right, maybe a couple inches too close. Should work well enough once you fix the other problems.
  5. Not sure, don't use that emulsion myself.
  6. Where did you wash out? Were you outside? Was there ANY sunlight? I always wet the screens for a minute or so, on both sides to soften the emulsion, then wash out.
  7. You shouldn't need a pressure washer to wash out your screens. If your emulsion isn't cured right you will wash out the edges, and your dripping, varying thickness emulsion will multiply that.
I use a pre-sensitized emulsion with a 500W exposure setup. I'm at 11-12 minutes exposure most of the time, and wash out with a sprayer similar to what you would see in a kitchen sink. Usually takes a couple minutes to wash out my screens.
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You did not mention it so I just want to make sure that you did remove the glass from the 500 watt light.
Thank you soo much guys! I guess I'll reclaim and start with all the suggestions :)

I'll take into consideration your coating suggestion. And yes, my screen emulsion was completely dry before doing anything with it. I'll also try exposing it for a little longer. I did have success when I exposed my screen with the same lighting for ~13min. I think it was over exposed, but I guess it's better than it being underexposed:) and I'm also going to use the candle stick drying rack suggested in my other post. :) Thanks again!

Thanks for the reply! I washed did my washout outside in a shaded area. I did wet my screen before applying any water pressure for the wash out :) I read some where that if you do so, the image will stick to your screen and you'll avoid any more unnecessary exposure.

Yes, I took out the annoying UV filter on my halogen light. :)

Thanks again guys, I'll come back to this post and update you guys with my progress. Things I know I'll change; coating my emulsion on both sides EVENLY, drying the rack shirt side down, longer exposure. Mahalo!
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did you mix the sensitiser correctly on the 925?
Also, make sure that the glass that you put on the film/screen doesn't have UV blocking in it.
Good chance that it might.
I took everyone's advice and guess what? It worked like a charm!!! The things I changed:

1. Emulsion on both sides of the screen (1 coat). I even took the "thestitchwitch" advice and coated my screen in the landscape position.

***I dried my screens with the ink well facing up :)
drying method correction | Flickr - Photo Sharing!

2. I found glass that was a little thinner than the one I previously used to burn the screen. It was a whole lot transparent too! compared to the first glass I used. I guess there was a UV filter on the glass I used.

3. Increased the exposure time to 13min.

4. When all was said and done, I washed it out with the garden hose, and within... literally seconds, the emulsion just came right out with no harm to my designs!!!

Thanks for you help guys.

I don't want to start a new thread, my question in very simple. I'm having problems printing with water base ink. The first print tends to be really good compared to the 2nd, 3rd, and so on. I notice the ink dries just a little bit. Here are some pics (order: 1st print1st print | Flickr - Photo Sharing!, 2nd print2nd print | Flickr - Photo Sharing!, 3rd print3rd print | Flickr - Photo Sharing!;
. My question is, how do I prevent this from happening? Is it the ink? Do I wipe the screen side everytime before I print a shirt? Any help will be greatly appreciated. I am searching the other threads as we speak! (I know they sell retarders to help the water base ink not to dry as fast but, don't want to spend the extra money if it's not necessary :)
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With waterbased inks, you want to be sure to keep your screen flooded to help prevent the ink from drying in the screen and in your image.
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