Speak To Me of Dual Cures

[mimosatexas]

I have been 1/1 coating with my monster max using the HVP and exposing on a 1k grow light for the past few days and holy crap is holding great detail.  Just yesterday I did a run of 300 shirts with Matsui discharge white using a 160 standard mesh, no diazo, but post exposed and hardened with MS.  It looks good as when I burnt it after cleaning.  Was also able to hold a line of text with characters that were 2 pixels wide at 300 dpi without issue.

[Admiral]

Sorry that was a typo in my post, yes it is Murakami SP-1400.

When we do water based ink printing it's often in the thousands so I need screens that won't give me issues ruining shirts during the run.  Haven't found a reason to try others from it, have tried a couple that didn't work well enough though.  I do remember just trying dual cure Proclaim and it didn't last long at all with water based ink. 

[Parker 1]

CCI WR14 @ 112LTU on an Amaragraph 150.  Works well for us.

Chris

[ABuffington]

Ok some more info on viscosity and solids,

We sell Aquasol HV an HVP, which as the lettering suggests is a high viscosity emulsion.
We also sell Aquasol HS - which you would think would stand for High Solids, well yes it is technically a High Solids emulsion, but it has a lot more viscosity for creating very thick stencils for glitter, puffs, gels, high density. 

The amount of solids in an emulsion has an effective upper limit.  Too much and the emulsion can be hard to coat, or become brittle.  Viscosity is a separate function of the emulsion to achieve coating on the typical meshes used.  For example, textile emulsions use a higher viscosity emulsion than Graphic Printing since graphic printing is on higher mesh counts and needs a lower viscosity to flow through the mesh and graphic emulsions tend to have a lower solids rating.  Textile emulsions need to coat down to 25S mesh and this requires creating a higher viscosity emulsion that levels well without dripping.

[ebscreen]

Finally got to play around with the CCI WR-14.

So far, I love it. We're at about 250 ltu on the 3140, give or take. Not insanely longer
than the Aquasol.

Our other supplier (I try to keep it to 3 maximum) is sending us one of the Murakami dual cures
to try, I think the 7500?

Kind of a no-duh moment. I would really only go back to Photopolymers if we were needing more
screens a day than the 3140 could handle with dual cure. The latitude for correct exposure is
just that awesome.

Only concern is that some of our lower mesh screens may sit around after being coated for a month
or more.

[ZooCity]

Only concern is that some of our lower mesh screens may sit around after being coated for a month
or more.

This is what I'm struggling with in leaping to dual-cure only.  We'll be able to store a lot more coated screens in our new shop and I'd like to take full advantage of that v. our current "hurry up and coat what we need" system.

Really leaning hard toward sticking with Aquasol for the thicker plastisol/HSA coated screens and running a dual cure for water based and dc...or maybe just running dual cure where it's really needed- high test detail, long runs, libraried screens. 

[Rockers]

I tested a 150 mesh coated 2/2 sharp side with WR-14.  Exposed for 500 light units on the Nuarc 3140.... and it was underexposed, by a lot.  Took FOREVER to reclaim since it was underexposed.......  We coated the screen that way since we would use the emulsion for both plastisol and waterbase.

I am sticking with the Saati PHU.  About 20% to 35% longer exposure times than the Aquasol. 

I used to use the Aquasol, but I can get the Saati from my dealer who is 200 yards away

Hm, we are no where near your exposure time with WR-14 on a 150S. Somewhere around 250LTU max. But our bulb is fairly new though. We really like the Image Mate DZ 343. That`s one fine emulsion. Not dual cure but diazo. No need for any hardener when printing discharge. Fairly fast exposure times and holds detail very well.

[ZooCity]

Oh, I have to toss a bone to Sonny here, the Xenon Nova is one of the best emulsions I have ever seen in terms of resolution and durability.  It's a photopolymer that you can add the diazo too.  Costs a pretty penny and takes forever to expose but will hold detail on meshes that the mesh can't even support on press.  It will likely become the emulsion we use for ultra long runs and libraried screens.  My printer can put Nova screens on press with wb and dc holding those scary 80%+ range halftone dots that are just hanging out in the void and still wipe down his screens without fear of losing them. 

My quest is to find a truly bullet proof dual cure.  Then it will be worth the downsides.  Nova's pretty close but we have a few more to test this spring.

Those using SP-1400 or a pure diazo- are you seeing an ability to not only image but hold finer lines and higher lpi over a water based run on lower mesh counts? 

[TCT]

I just coated a handful of screens with SP-1400 the other day and did a step test yesterday to dial in exposure time.
We have a run of about 5k and another one of 700 tomorrow that I am going to put the 1400 to the test! The larger job is DC/HSA and the 700 is a 3 color WB.

I'll update tomorrow...

[Underbase37]

We have a few big DC jobs comming up soon. Looking forward to trying the Xenon Nova, we have tried a few others with results verying from ok to poor. Sonny was supper helpful & full of info when we spoke on the phone & replied to my email very quick.

[jvanick]

I also use the xenon nova... absolutely no complaints... probably overkill for normal non halftone plastisol printing, but the no variables part of exposing screens really appeals to me... (and ultimately probably less costly for us too)

Sent from my SCH-I545 using Tapatalk

[Colin]

Finally got to play around with the CCI WR-14.

So far, I love it. We're at about 250 ltu on the 3140, give or take. Not insanely longer
than the Aquasol.

Our other supplier (I try to keep it to 3 maximum) is sending us one of the Murakami dual cures
to try, I think the 7500?

Kind of a no-duh moment. I would really only go back to Photopolymers if we were needing more
screens a day than the 3140 could handle with dual cure. The latitude for correct exposure is
just that awesome.

Only concern is that some of our lower mesh screens may sit around after being coated for a month
or more.

How did you coat your screen?

Mesh count?

I ask since we coated our 150 mesh 2/2 round side for plastisol and was underexposed at 500 ltu on the 3140.

And... it wouldn't reclaim properly.  We had to rip the emulsion off with the pressure washer....

[ebscreen]

2/2 or 1/2 depending on mesh, round edge. Bulb is a month or two old.
Meshes from 150-305, 250 LTU was about middle range.


From what I've seen as general consensus on this emulsion, bad batch maybe?

[Colin]

Thanks EB.

I will coat a couple more screens and test again.  Then contact my supplier and see what I can do.

Appreciate it!