screen printing > Waterbase and Discharge

Discharge buildup on underside of screens

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cclaud3:
Yes 150s & 225s. single stroke for that job as it was one of the first with the system to try to follow the TDS. 400+ pieces and sticking happened around 50 pieces in.

Raw Paw:
I may have overlooked this in your thread, but if you aren't using retarder I would highly recommend it.  We add 4% in every ink mix, and for discharge white we use 4% retarder + 4% water

cclaud3:
Ok, just updating this from the last 6 months of printing.

We print water based all day on a 10/14 automatic.

Magna discharge is the only series that doesn't buildup for us. I'm not sure what the difference is chemically but every time we try to sneak a matsui or aquarius dc color back into a multiple color print it builds up and start blotting out the subsequent screens. Matsui spot black non-dc also builds up. Magna black made from either HB or ND Xtra base prints great without buildup. We are not using any additives with the magna although we did purchase some retarder initially for the Edge series which we were not fans of.

Magna dc allows for a large amount of colors wet on wet for as many prints as we want. We still use Matsui if we are unable to color match to an older multi-color print that it was used for or sometimes just for a 1 color print since we have so much of it.

Over the last couple of years we have used many different emulsions. All brands & models resulted in the same buildup with the other ink lines. The magna works with the last few we've used.

Admiral:
I think Matsui is what I have used in the past for colors, don't they have a brite base and high mesh base? the brite base made the inks stick, the high mesh made it so we printed WOW without flashing, 8-10 screens just fine.

For emulsion I have always used SP-1400 for water based discharge printing, others we have had issues with. YMMV but that's what I recall, we print like 1 water based job every 4-6 months now.

cclaud3:
We have nearly every discharge base that they make.
Brite White & Clear, Brite White, Super 75 White, Binder 301, High Mesh (HM) White & Clear. We didn't fool with the first down/ub product.
With and without Quick additive. Buying everything in 5's.

High mesh was too dull and still built-up on backs of screens. Apparently something in our environment didn't like the Matsui & Aquarius dc line for wet on wet.

SP-1400 was tried. We have a moisture meter that implied dry screens, along with a few other tests. Following all the standard protocols for water based efficacy.

Just throwing this update up for the others that experience(d) the same issue. Thanks

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