Black ink eating through emulsion...

[whitewater]

we use saati PV emulsion.  We use Union Black ink

Right now the black is eating through the emulsion after 600 shirts.

No other color is doing it, the black has done this once before on a long run//


Thanks

Rob

[KevWilso]

Is this Union plastisol or water based black?

If it is plastisol your screens are probably under exposed.  Check your light source.

[tonypep]

Its the carbon in black. Very aggressive.

[whitewater]

plastisol...here is a pic...

if under exposed why are all the other colors ok?

even burned halftones after this screen and no problems.

So Tony, think the carbon?

[tonypep]

Probably a combination of underexposure and the carbon being the most aggressive pig

[blue moon]

how do you coat, what emulsion do you use, what do you expose with and how long?
it should give us an idea if it's potentially underexposed. . .

pierre

[whitewater]

satti pv emulsion, cheap black light box, that screen was a 156, coated 3/3 , time....its on feel...LOL..we just have a 2 dots on the timer, one for 110.156 and another for our 230's

no other color does this.

I'll try to expose longer....we usually do not have this type of issue..

[abchung]

For me, we wasted about 6 screens due to the mesh not being dry enough.

So may be the drying room humidity is going up due to summer, which slows down the drying process?

[Screened Gear]

For me, we wasted about 6 screens due to the mesh not being dry enough.

So may be the drying room humidity is going up due to summer, which slows down the drying process?

My guess is along these lines. I have never had a screen break down from plastisol ink. Pin holes open up on press yes but never breakdown. It has to be underexposure. Also coating 3/3 for a black screen is way over kill. That screen will need alot of exposure time to be fully exposed. So my answer is coat less let dry over night and make sure to fully expose.

[whitewater]

i know 3/3 is overkill...but the screens had streaks when we coated the 2/2

this is a new place we are in, so everytihing climate wise is messed up..I thinkk its the humidity too.