emulsion for water based

[noortrd]

Anybody tell us the good no diazo without  hardener emulsion for water based?.

[dirkdiggler]

honestly, it does not exist.

[Parker 1]

I will second that....

[TCT]

For long runs, I'll third that(can you third something?)
For basic and smaller runs we use Murakami HVP, allow for proper drying and post expose.
Longer runs we use Murakami SP1400. Holds up better on WB and is ridiculously cheap. Downside is longer exposure, need to mix in diazo, lower solids and more intensive reclaiming...

[abchung]

For extremely long runs with home-made emulsion, some people don't use hardener. They use wood varnish. We don't do it in house, it is just too time consuming. We contract it out.

These are the steps.
1. expose screen as usual.
2. brush on wood varnish on one side of screen.
3. Lay the screen horizontal with varnish side up.
4. Use a rag dipped in methylated spirit and gently rub it on the other side of the screen. The methylated spirit will dilute the varnish and the cloth soaks up the diluted varnish.
5. Once dried, turn over and repeat the process.

The varnish acts as a water proof barrier.

[Binkspot]

We have only done short runs but the Saati PHU hold up fine with a post exposure, usually in the sun.

[Evo]

Ulano 925WR. Not the best in detail but it has excellent water resistance when properly exposed. It has a very wide exposure latitude though, so don't be fooled - it needs to be exposed out to the maximum end of the exposure range (before pinching detail) to get the best water resistance.

Hold up to discharge without hardening on small runs.

[Frog]

The OP is looking for an emulsion that does not require diazo.
He wants the fast exposure of a photopolymer, but the water resistance of diazo or hardener without adding either.

Really tough search for this one.

[Evo]

The OP is looking for an emulsion that does not require diazo.
He wants the fast exposure of a photopolymer, but the water resistance of diazo or hardener without adding either.

Really tough search for this one.

Doh. Didn't notice the "no diazo" part.

This is a have-cake-and-eat-it-too situation. If you want good water resistance, it's diazo or hardender or both.

[alan802]

I thought the Xenon Nova and CCI HXT were options along with the Aquasol HV/P?  Depends on your definition of long runs I guess but haven't there been printers here that have done 3-5K pieces with these emulsions above without using the optional diazo?  We've done 1500 on one set of screens without diazo and we didn't do more because that was the size of the job.

[Frog]

I thought the Xenon Nova and CCI HXT were options along with the Aquasol HV/P?  Depends on your definition of long runs I guess but haven't there been printers here that have done 3-5K pieces with these emulsions above without using the optional diazo?  We've done 1500 on one set of screens without diazo and we didn't do more because that was the size of the job.

I would bet that especially with discharge, most printers running 3-5k would use the hardener if they didn't want to lose the exposure speed by adding diazo.

[alan802]

How long is the hardener step for everyone?  Is it something that adds very little time to our pre-press discharge procedure.  Spray on, wipe down both sides, sits in front of a fan for a minute or two and we're press ready.  Others may spend more time on this step and the fact that we aren't doing thousands of pieces may be the reason this step being hurried hasn't bit us in the A-nus.  Thoughts?

[Frog]

How long is the hardener step for everyone?  Is it something that adds very little time to our pre-press discharge procedure.  Spray on, wipe down both sides, sits in front of a fan for a minute or two and we're press ready.  Others may spend more time on this step and the fact that we aren't doing thousands of pieces may be the reason this step being hurried hasn't bit us in the A-nus.  Thoughts?

The OP, noortrd will have to explain why he doesn't want to use hardener. Perhaps worry of reclaim difficulty?

[ebscreen]

With Murakami's non-permanent hardener the extra effort in reclaim is minimal. The emulsion comes
off a little chunkier but other than that not much difference. Application is as easy as Alan described as well,
and given the small extra effort we use it on most runs over 50 or where fine detail/halftones are involved.
Cheap insurance.

We do let the hardener sit without a fan/sun for as long as possible though.

[brandon]

With hardener application like any proper screen exposure it should be done at least a day in advance. I am almost positive that even the instructions on the hardener say to let set 24 in advance. I'm probably wrong though haha. I just like to have everything ready in advance. With the Aquasol emulsion before I sold my last shop we were doing large runs of several thousand no breakdown easy.