Exposing and Washout | How To Get Fine Detail In Your Coated Screens
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- Опубликовано: 23 июн 2020
- You've perfected reclaim. Your humidity has been top notch. You've got a pretty decently coated screen and a solid detailed design. Now it's time to expose and wash out the screens like a pro. Colin demonstrates what will happen with imperfect screens when you expose and wash them out through the results of the step wedge calculator and gradient scale. Learn what differences you'll see between thin thread and standard thread during the exposing and wash out process. Take in tips for washing out screens (keep your distance). Overall, you'll gain an understanding of the exposing and wash out process, what tests you can implement to ensure you burn an optimal screen, and ways you can improve processes in your own shop to get the best detailed prints.
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alot of people won't be interested but it helps alot for us new printers to have a better detailed exposed screen thank you bery much
Thanks for watching, appreciate the comment!! Let us know if you need help in other areas.
Just wanted to say thank you for taking the time to share your experience
Thank you!!!!
Great words of encouragement at the end, thank you sir.
Im not sure what I'm doing wrong but the unexposed areas on my screens blow out even if I'm not beating on it. If I go past 30 seconds all the detail blows out. I've been through probably 30+ tests at this point with not a single succes washout. Impressed that your screen kept intact. I don't think my light works very well.
Thanks for uploading these! I learn so much 🤙
Thank you Sunny! I was glad to teach you something new.
Absolutely love the new videos you have been creating this year. Could you please create a video on how to properly align your negative and getting that perfectly aligned screen onto the manual press?
Awesome!
Thanx alot for detaled descriotion of process!
Glad it was helpful! Reach out anytime with questions!
How important is it to have your washout booth in a light safe area? I'm stilll getting my shop set up and currently wash them out outside in a tub as I don't have a washout booth (yet). Thanks for the great content!
You can find more info about that here: www.screenprinting.com/blogs/news/best-practices-for-setting-up-shop-in-your-garage
Thanks for watching everyone!
How long should you soak your screen in a water only dip tank?? Thanks
Hi Sparrkyy! Anywhere from 30 seconds to a couple minutes. Depends on the level of detail you want to let the water soak into. Past a couple minutes, there is no extra benefit.
What about a completely solid gradient with no dots or halftone? I assume the photo emulsion will simply release at some point and you won't see the gradient?
Hi @S.C. Wood - I think i understand your question. SO as if you were trying to print a photo gradient, right? The issue would most likely be that at some point the gradient on film would not block the UV in exposure. And to your point, the gradient would abruptly stop. hope that helps.
hi there can you explain what did you mean by "30% EOM (emulsion over mesh?)? thank you!
Its a percentage of the difference in your mesh thickness in relation to your emulsion thickness. If your mesh thread is 100 microns thick and your screen thickness after coating is 130 microns thick, your emulsion is 30% of the total thickness, so your EOM is 30%.
@@colinhuggins6164 thank you thank you, yea!!!
I am having major problem with a very detailed screen. I have an old national screen printing light cabinet. I’m using a 1000W halogen at the bottom. (3 feet away) and then two UV florescent 4’ lights on the top and bottom (this is how it is set up..it’s a antique 🤣) Are these the correct light bulbs for this? It’s very uneven exposer. The middle of the screen doesn’t expose the same detail as the top and bottom. Any input would help TIA
Hi Renea. I actually had a unit like that back in the late 90's. I know I was able to keep very high detail with that unit when 1) my screens were correctly dried 2) my films were dense enough 3) I was using the correct mesh count 4) my screens were evenly coated.
My first guess is that - since you are saying the middle of the screen wont resolve the image - there is 1 or 2 things going on.
1) Your screens are not evenly coated - this can happen for a couple of reasons. the middle area of the screen is typically thicker than the rest of it. Place a screen against a light source like your spray out booth and see if the middle area is darker than the outside. For this, we fix it by concentrating on getting a very smooth and even emulsion coat.
2) It is possible that the exposure unit is uneven with its light - being far stronger in the middle or weaker? You did not tell us if the middle is underexposed or overexposed.
My conclusion - take a look in your darkroom and see if I pointed anything out that may help.
Let us know if you are over or underexposed in the middle of your screen.
When doing a more highly detailed print does the exposure need to be quick or longer?? And should the emulsion be a lighter coat
Hi! Exposure times are directly related to how thick or thin your coating of emulsion is.
so, higher mesh counts will typically have a thinner coat of emulsion than lower mesh counts.
This means higher mesh counts will expose faster than lower mesh counts.
To determine if your emulsion has been properly exposed, we recommend the use of a 21 step greyscale calculator. Follow all instructions for use.
Also, you will need to ensure your emulsion is properly dry before exposing. This means all the moisture is gone from the emulsion. This happens when warm dry air is moving over the screen in a space that is below 40% humidity, preferably closer to 30%.
@@Ryonet do you have a link available for the 21 step greys ale exposure calculator?
Hey please another video of using micro registration with better angle views
I have a plan to make a video on just that in the next few weeks!
Why dont my screens wash out easier?? Am I over exposing it.. Seems to take forever to wash out the image from emulsion...??
Hi Kathy. If you have a light safe environment, then your films may not be able to stop enough light. It would be similar to my exposing the droplet weight test film. Where the ink jet ink was thinner, more light penetrated through, partially exposing the emulsion beneath it. If you do not have a light safe environment, you could be pre-exposing your emulsion from that light leak. Another possibility - are you rinsing your screen in a non light safe place? This could expose the image as well. Lots of potential reasons, but they all go back to - somehow light is hitting your emulsion where you do not want it, how is it getting there?
Why manual screen printing are not available in India?