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Originally Posted by tpitman |  | | | | | | | | | These samples are process on black tees? | |  | |  | |
Yes, 100% cotton black Jerzees t-shirts.
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Originally Posted by tpitman | | | | | | | | | | Not to sound skeptical, because all I've printed is process on white with a white underbase to help hold down fibrillation, but many say process on black is tough or next to impossible because the white underbase necessary to block out the black renders the process inks pastel. I'm using Union's process inks also. | | | | | | |
The white underbase must be very good, but it isn't really any different than trying to print a good white onto black. Last week we tested several different whites and switched to cotton white.
For black i don't use unions process black, but have typically used a high opacity spot black and print the black first. I'm also testing unions triple pigment process black. I've also posted details on what i call "super black", which is where is flood the other process color channels to 100% whenever the black channel is at 100%
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Originally Posted by tpitman | | | | | | | | | | Is the transfer function you show here the one you used for this prints? I already have to double-stroke some stuff to get a good, rich print, so maybe I'll try these, since they're a little more aggressive on the ends. | | | | | | |
Yes, that is my transfer function. In separate post i describe a calibrated double stroke. With a single stroke i was getting a lot of snowflaking, so i adjusted the transfer function back about 40% and always double stroke the screen. The light end of the transfer curve is bumped up to where the screen can actually produce a dot. The dark end makes a rapid jump to 100% coverage over 90% because i want full coverage to be as full as possible. Where the art has 95%-100% coverage, the double squeegee will put nearly 150% ink.
By using a calibrated double stroke, the shirt to shirt repeatability is very good.
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Originally Posted by tpitman | | | | | | | | | | By the way, the samples you are showing look pretty damn good, especially for someone just venturing into process work. Process on black would be a hell of a lot easier than simulated on black if it works as well as these samples indicate. | | | | | | |
I'm new to screen printing, but not new to printing. I'm glad my experience is transferring so well. The transfer function i posted would be nearly identical for a chemically etched gravure cylinder, except gravure uses a cross hatch spot function.
For jobs designed using full color, printing them is process color should be very easy. I've got a 6 color press, so simulated process really isn't an option for most designs.
Next week i'm planning to make a banded color test and tune the transfer function.
fred