Author Topic: Black ink eating through emulsion...  (Read 2595 times)

Offline whitewater

  • !!!
  • Gonzo Member
  • ******
  • Posts: 1831
Black ink eating through emulsion...
« on: June 11, 2014, 01:42:42 PM »
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


Offline KevWilso

  • Full Member
  • ***
  • Posts: 203
Re: Black ink eating through emulsion...
« Reply #1 on: June 11, 2014, 01:58:45 PM »
Is this Union plastisol or water based black?

If it is plastisol your screens are probably under exposed.  Check your light source.
Kevin Wilson
River City Graphic Supply 512-454-0505 www.rivercitygraphicsupply.com

Offline tonypep

  • Ludicrous Speed Member
  • *******
  • Posts: 5683
Re: Black ink eating through emulsion...
« Reply #2 on: June 11, 2014, 02:03:07 PM »
Its the carbon in black. Very aggressive.

Offline whitewater

  • !!!
  • Gonzo Member
  • ******
  • Posts: 1831
Re: Black ink eating through emulsion...
« Reply #3 on: June 11, 2014, 02:04:52 PM »
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?

Offline tonypep

  • Ludicrous Speed Member
  • *******
  • Posts: 5683
Re: Black ink eating through emulsion...
« Reply #4 on: June 11, 2014, 02:18:33 PM »
Probably a combination of underexposure and the carbon being the most aggressive pig

Offline blue moon

  • Administrator
  • Ludicrous Speed Member
  • *****
  • Posts: 6366
Re: Black ink eating through emulsion...
« Reply #5 on: June 11, 2014, 02:43:12 PM »
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
Yes, we've won our share of awards, and yes, I've tested stuff and read the scientific papers, but ultimately take everything I say with more than just a grain of salt! So if you are looking for trouble, just do as I say or even better, do something I said years ago!

Offline whitewater

  • !!!
  • Gonzo Member
  • ******
  • Posts: 1831
Re: Black ink eating through emulsion...
« Reply #6 on: June 11, 2014, 02:45:47 PM »
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..

Offline abchung

  • !!!
  • Sr. Member
  • ****
  • Posts: 481
Re: Black ink eating through emulsion...
« Reply #7 on: June 11, 2014, 03:12:53 PM »
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?

Offline Screened Gear

  • Gonzo Member
  • ******
  • Posts: 2580
Re: Black ink eating through emulsion...
« Reply #8 on: June 11, 2014, 04:48:35 PM »
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.

Offline whitewater

  • !!!
  • Gonzo Member
  • ******
  • Posts: 1831
Re: Black ink eating through emulsion...
« Reply #9 on: June 11, 2014, 05:01:22 PM »
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.