screen printing > Waterbase and Discharge
Waterbase flukes
brandon:
Looking forward to your Magna activator testing. It definitely helped us
cclaud3:
Still occurring with Magna activator on black bellas & next levels.
Thousands of Gildans in assorted colors had no problem with CCI (previous) and Magna (new) activator.
Did not happen on 250 navy bellas. 2 color discharge front + 4 dc back. Magna Activator
Did not happen on 250 army bellas. 4 color discharge front + 4 dc back. Magna Activator
Re-ran the 2 color green/white dc print. Actually ran this 4 times using same screens for DC version. Final DC attempt was run on the backs of defect shirts from the first two attempts and they PRINTED FINE????
Ultimately ran HSA to complete for customer.
Today ran the 7 color DC on black bellas. Splotching/dots in red & yellow as previous attempts. Used magna activator.
So, have used 2 different activators. Same & new sets of screens for re-runs. New bottle of Yellow HG pigment. Thought it may be that since Yellow 021 is only made up o f Yellow HG.
Gildans run fine.
Only other logical thing I can think of is the US plastics mixing cups have some sort of contaminant in SOME of them.
blue moon:
--- Quote from: cclaud3 on January 26, 2024, 01:17:23 PM ---Still occurring with Magna activator on black bellas & next levels.
Thousands of Gildans in assorted colors had no problem with CCI (previous) and Magna (new) activator.
Did not happen on 250 navy bellas. 2 color discharge front + 4 dc back. Magna Activator
Did not happen on 250 army bellas. 4 color discharge front + 4 dc back. Magna Activator
Re-ran the 2 color green/white dc print. Actually ran this 4 times using same screens for DC version. Final DC attempt was run on the backs of defect shirts from the first two attempts and they PRINTED FINE????
Ultimately ran HSA to complete for customer.
Today ran the 7 color DC on black bellas. Splotching/dots in red & yellow as previous attempts. Used magna activator.
So, have used 2 different activators. Same & new sets of screens for re-runs. New bottle of Yellow HG pigment. Thought it may be that since Yellow 021 is only made up o f Yellow HG.
Gildans run fine.
Only other logical thing I can think of is the US plastics mixing cups have some sort of contaminant in SOME of them.
--- End quote ---
see what happens if you run them through the dryer first. Maybe it's the sizing.
pierre
cclaud3:
It was the air lines in the ROQ probe flashes. The airlines shoot little bursts of air every so often to cool the sensor. We use a chiller and check/drain the compressor's tank everyday, along with the drain on the press. A minuscule amount of oil/contaminant in the air lines...can't see it happening but flashes on (even at 75C) causes the dots/splattering. Mainly used the flashes to keep platens tacky.
Kept re-running the black fashion tee job(s) and ruining shirts, ran the job without flashes and it went away. The Weirdest thing is that the staining did not show on anything but Black Bella Canvas & Black Next Levels with discharge bases only.
We swapped to new batches of ink, pigment, activator, screens, mixing containers. Flashes off fixed it.
brandon:
That is interesting. Thank you for sharing
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