Pre-sensitized Emulsion Question

With proper films, and good emulsion like Saati Chem PHU, or Murakami HPV the second I've never used but there was a post on another form where a guy exposed it 12 min with 1000w metal halide unit and still washed out fine. I have accidentally exposed the Saati chem 8-9 min where 1 min is the correct exposure and mine had halftones and washed out fine.

With your exposure unit undercutting would be the issue if you were off by a min or so. Otherwise the latitude on some photopolymer is a lot longer then most will tell you. If you had a single point exposure unit the latitude can be wider then a few min.

Great info to know sben. To continue the question regarding Ulano specific products does anyone have any input on their experiences with QTX vs QX1.

I know everyone has their preferences but my vendor has CCI or Ulano products. I tend to support my vendors once they provide me with superior service thus looking at Ulano but also still open to others

TextulPV is my only emulsion of choice. I love everything about it even the shelf life. I do believe that if you post expose in the sun it is waterproof and it can be used to print water based inks without issue.


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Sben,

By under cutting you are talking about under exposing the screen correct?

No under cutting happens from from multi point exposure units. The long a over exposure the worse it gets. It under cuts the film causing irregular lines on spot process or smaller/ irregular halftone dots on halftone/simulated prints. The halftone can be a good thing. When I used the unfiltered black light I never used any dot gain compensation and had no issues. When I switched to a single point (1000w metal halide) I had to compensate for printer dot gain and on press dot gain.

I'll see if I can find the thread I posted a image of multi point vs single point. Its easier to understand how this happens.

I'll second Saati Textil PV as an excellent no-mix, fast emulsion. Cheaper than QTX, too.
Between QTX and QX-1, I'd take QX-1. It's less expensive, and I rarely had trouble with it in reclaim, since it has solvent resistance. I used it when I was doing coroplast signs and shirts to whittle it down to one all-purpose emulsion. I don't remember the exposure window on it being particularly narrow.
I currently use Saati Grafic HU-42. It's a dual-cure and needs mixing, but it claims a shelf life of 60 - 90 days after mixing if kept sealed and out of the heat. It also claims some water resistance with full exposure. I've gone past 60 days without issue. I buy quarts so there's no waste. It also reclaims without any snotty, gummy balls of emulsion that others sometimes have when scrubbing the reclaiming chemistry onto the screen.