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Screen Washing Problem

Posted on Tue, 1 Feb 2005 at 11:38



We are new to screen printing and we are printing on CDs using Marabu UV inks. When we wash the screens out, a thin haze is left in portions of the screen. This haze is just thick enough to block the screen. It is also fairly random and ends up blocking about 10 - 20% of the open fabric area.

If we rub on the scren long enough (a couple hours) it eventually comes out. If we then re-use the screen then it washes out normally.

We are using acetone as a washout which is recommended by the rep from whom we purchased the ink.

We are contracting out the screen making to another company who insists its not a problem on their end. If anyone has any suggestions as to what may be causing this I would greatly appreciate it.

Thanks,
Tom

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Comments

Anonymous says: Tom, it's a problem on your supplier's end. The problem you are having is under exposure. When you under expose a screen, in the drying process, a residue is left behind. So when the water dries, a film ...

Tom, it's a problem on your supplier's end.

The problem you are having is under exposure. When you under expose a screen, in the drying process, a residue is left behind. So when the water dries, a film is left. If they increase their exposure time a little bit, it should elimate this problem.

Laying them flat helps as well as patting them down with newspaper or something similar. To be quite honest, I've found you don't have to do any of that as long as your exposure time is correct.

If the screen doesn't have a lot of pin holes or some are slight, have them increase their times in 30 second increments to elimate the problem. Their should be no haze whatsoever in a properly exposed screen.

posted on: Tue, 02/01/2005 - 1:58pm
Anonymous says: If you get something of this nature again, take a lint free towel and dab it in water. Dab the towel in the area of the problem on the underside of the screen (or also known as the print side). Do not ...

If you get something of this nature again, take a lint free towel and dab it in water. Dab the towel in the area of the problem on the underside of the screen (or also known as the print side). Do not rub too hard, otherwise you might break down the emulsion.

If you dab it with water and blow it dry, you should see the film disappear.

If you have problems, you can email me.

posted on: Tue, 02/01/2005 - 2:01pm
Anonymous says: Jerid is almost surely right on the "ghosting" your describing after washing out your screen. If your supplier gives you grief, deffinitely find another screen maker as he's either trying to wiggle out ...

Jerid is almost surely right on the "ghosting" your describing after washing out your screen. If your supplier gives you grief, deffinitely find another screen maker as he's either trying to wiggle out of a responsibility he's aware of or he's not qualified to make screens for other people (if he wants to put up with emulsion reclaiming problems with his own screens, that's one thing but to "farm out" his problems to others is another).

Good Luck
Rocky

posted on: Fri, 02/04/2005 - 3:32pm
Anonymous says: to quote Rocky, "if your supplier gives you grief, definitely find another screen maker..." roberto posted on: Wed, 03/23/2005 - 5:15pm

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