Author Topic: emulsion for water based  (Read 3190 times)

Offline Colin

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Re: emulsion for water based
« Reply #15 on: January 30, 2014, 08:40:29 PM »
With any hardener, higher heat (80 degrees to high 90's), lot's of air movement/low humidity, and at least 12 hours of dry time is recommended.

All emulsion companies will tell you to use the softest squeegee possible coupled with the lightest pressure possible to ensure maximum screen life.

I have not been able to exceed a couple thousand print strokes before screen breakdown using Murakami HV and Saati PHU with a general hardener.  This is printing Discharge Inks.

If I make my screens bullet proof, I can exceed 10K impressions.  At that point I just pop in new screens just to make sure nothing fails past 10k prints.
Been in the industry since 1996.  5+ years with QCM Inks.  Been a part of shops of all sizes and abilities both as a printer and as an Artist/separator.  I am now the Ink and Chemical Product Manager at Ryonet.


Offline ZooCity

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Re: emulsion for water based
« Reply #16 on: January 30, 2014, 10:27:23 PM »
Our first wave of testing to try and get a no post-expo, no hardener, durable emulsion made us conclude that we can eliminate post-expo but not hardening.  There's lots more to test though. 

Nova with Diazo is some amazing emulsion.  Expo is very long and we do still need to apply hardener.  I know others are getting the goods from Nova without hardening though. Nova can hold detail that is over the top and, unlike any emulsion we've yet to trial, will print a run with WB ink that is much more aggressive than many of the textile inks and, after cleanup in the booth, looks like it could run again.  Our challenge with Nova has been getting the stencil's EOM where we need it, trying to get more EOM on the squeegee side in this case as delamination has been pretty much it's only weakness.

We were sent a pint, seriously a single pint, of CCI's HXT so we haven't been able to give it a fair shake.  We dialed in the expo but the couple screens we put on press were pulled by my printer as they exhibited immediate issues....and then the pint was spent.

We have to revisit this in the Spring when it warms up, too cold to reliably ship emulsion right now and I think we may have had a "stale" bulb that we purchased so we need to retry things after we move.

Big time agree that cooking screens after hardening is beneficial.  Alan at Murakami tipped us off to this awhile ago. 

Has anyone tried Autosol 8000?  TW Ink recommended it and their inks are the most aggressive WB inks I've ever seen or heard of. 

Offline Evo

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Re: emulsion for water based
« Reply #17 on: January 30, 2014, 11:19:40 PM »
Just FYI - don't apply hardener and put the screen in the sun before it's fully dry, it can damage finer mesh. Found out the hard way.
There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply. The person who buys on price alone is this man's lawful prey.
John Ruskin (1819 - 1900)

Offline brandon

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Re: emulsion for water based
« Reply #18 on: January 30, 2014, 11:40:22 PM »
I should elaborate. We did post exposure on the Aquasol as well. I have been told even with proper exposure and when youthink you have it dialed in you still have aaround 10% percent that is not completely exposed. And as I was saying we did our reclaimable hardener a day in advance and let it sit in our "hot room" if that makes sense.

Offline brandon

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Re: emulsion for water based
« Reply #19 on: January 30, 2014, 11:42:19 PM »
Sorry for the misspellings on my phone and it's late. Good night everyone