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coating and washout

Posted on Sun, 6 Aug 2006 at 16:11



I am having trouble washing out my screens. I started using Ulano a couple of weeks ago and i cant get my screens to washout. Is this a exposure issue or am I doing something else wrong? any help?

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mcdonaldlabel says: Are you having trouble washing out your Emulsion? or are you using capillary films? We use capillary films at our shop and have no trouble washing them out with a pressure washer. We then will use ...

Are you having trouble washing out your Emulsion? or are you using capillary films? We use capillary films at our shop and have no trouble washing them out with a pressure washer. We then will use haze remover adn wash that out after an hour or two

posted on: Sun, 08/20/2006 - 8:33pm
Djenka says: Use sericol seristripe :D :oops: Maybe you are under or over exposing your screens posted on: Fri, 09/22/2006 - 12:52pm
Andymac says: first are you talking washing the image, or reclaiming the screen? I'm assuming washing the image. if nothing else changed except your emulsion, then it is safe to assume your new emulsion has a different ...

first are you talking washing the image, or reclaiming the screen?

I'm assuming washing the image.

if nothing else changed except your emulsion, then it is safe to assume your new emulsion has a different exposure window than your old. emulsions all have different speeds.

if nothing comes off the screen after exposure, then it is over exposed. if you don';t have an exposure calculator, you can do a step exposure to find your new time.

lay down a large film with details, then divide your time by 10 and your image area by 10 - move a piece of rubylith or black paper across the image one/tenth of that time.
for example, old time 15 minutes.
image 20 inches
move the paper 2 inches every 90 seconds

Wash it out, find the one that looks best with no slimey feel to the stencil surface after a thorough washout. you can play with the times to adjust for white mesh, yellow mesh, thicker coat, distance change etc, these all affect your times

one last thing...if you switched from a diazo emulsion (where you add powder) to a one pot (pre sensitized photo polymer) then you may have to drop your time even more, the one pot stuff is super high speed.

you can get a calculator film that helps you do this in one go. check with your supplier, maybe they will loan you one to get your system dialed in

Good luck with it.

posted on: Fri, 09/22/2006 - 2:34pm

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