CMYK Values for Shirts! RGT? Anyone?

[S.Blake]

I got a client that wants CMYK films output.

Normally I use..

C: 56
M: 71
Y: 86
K: 26

With an angle of 22.5

My question is.. I haven't done CMYK seps/films in YEARS... what dot/angle/screenmesh/print order/etc.. What is the industry standard these days?

Thanks!
S.

[Fools Gold]

YMCK
22.5
32.5
52.5
22.5

55LPI

is what I've used in the past, but I've only done it on paper . . . but it worked great.

[ASPrintingPress]

Y 22
M 82
C 82
K 22

50 LPI
Elipse

[RichieGoodtimes]

52 82 22 22

55lpi

ROUND with inkjets.

[ohdanielsan]

i was also curious about this, as i've never done it before. what is the purpose of the duplicate angles? i thought all angles were supposed to be different, no?

and 50/55 LPI would be for a 200/220 mesh count or higher, right?

[RichieGoodtimes]

The duplicate angles are the yellow and the black. Least likely colors to moire with each other.

305 for 55lpi, though you could probably get the yellow on a 260.

[andydiesel]

52 82 22 22

55lpi

ROUND with inkjets.

why round with inkjets?

about a year or two ago i switched from eliptical to round dots because it looked/printed better for us on our presses. is there some scientific reason why?

[RichieGoodtimes]

The science states that ink spreads on inkjet films and lengthens the dots naturally based on how the heads lay the ink down. Round dots become slightly elliptical.

[S.Blake]

Right on thanks!

S.

[ohdanielsan]

The duplicate angles are the yellow and the black. Least likely colors to moire with each other.

305 for 55lpi, though you could probably get the yellow on a 260.

ah, i see. makes sense. i found this article a while back that talked about a bunch of screen printing pre-press techniques. here's a quote from the part about angles. any thoughts about what this guy is saying? is it valid?

For coarse halftones of 50 lines/in. or below, conventional litho angles (Y = 0°, C = 15°, M = 75°, K = 45°) will work if the mesh is a plain weave of 355 thread/in. or more. The dots are large enough that the angular interference of the mesh with the halftone structure is not too much of a problem.

But as the line count gets higher (smaller dots), we must rotate the entire angle set away from the traditional litho angles, primarily because the angles for the yellow and black dots correspond exactly with the weave of the screen mesh and are likely to cause moiré. [...]

The most common corrected angle set for screen printing is Y = 7.5°, C = 22.5°, M = 82.5°, and K = 52.5°. These values will work for 95% of all screen-printing applications, even with the very fine line counts used by CD decorators. Also note that by using mesh with a lower thread diameter and plain weave, your chances of success increase substantially.