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screen printing => Ink and Chemicals => Topic started by: Stinkhorn Press on May 19, 2017, 09:48:53 AM
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We run maybe 1 discharge run a month. We've been on the Matsui system for years, fairly comfortable with it.
We have done very little pure white discharge, and it's been a long time AND I've read some things on here that many people DON'T use the proscribed mix to get a good white.
What is you discharge white formulation?
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Add penetrant, maybe open time extender and drive it into the garment.
Done.
Not all whites are created equal.
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We use Matsui Super 75, which is a premix of 75% white discharge and 25% clear discharge base. We add 5% retarder and usually at most 6% activator depending on the shirt color. We cure for 3min.
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Depends on the White. CCI D-White we drop in penetrant, softener. Rutland's White Plus needs nothing.
We use retarder here in all wb/dc/hsa inks due to the climate and the firepower we have in the dryer but that's situational.
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We've used Matsui's Super 75 and HM discharge whites...Super 75 is not a good white for under basing and it may be because I didn't mix it with discharge base. Top colors washed off! It does an excellent job as a 2ND white...The HM discharge white at 70% and bright discharge base at 30% did a nice job even on a direct dye garment which I was surprised and happy that it worked out...It's a little thin but if your doing some finer 1/2 tones it does get good penetration into the garment without locking up. Under base printed with 160 on this job as well...
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Guess it bears repeating that pure DC whites out of the bucket are not intended to be used as underbases. High solids=poor adhesion. Long ago a few creative thinkers came up with a DC base to white ratio formula that works. Some ink manufacturers caught on and make/market a DC/UB ink but either make it yourself or buy it thats the way to go