Is there any article published for the FM screening and ink film thickness on the ink rollers ?
We have goss colorliner coldset newspaper printing presses.
AFAIK, ink film thickness on the substrate yes, but not anywhere else.
What is your concern?
best, gordon p
Ink splitting for the AM and FM should be different on the ink rollers of the press. It is said that the ink film thickness should be lower on FM. I try to collect data before starting test on our press: specially the ink film thickness on the rollers, splitting of ink and fount solution volume.
Just to be clear, the lower ink film thickness with FM only happens on screen tint areas.
For example. Here is a photo of a 175 lpi AM and 20 micron FM screened to the same measured tone along with a solid patch of Cyan.
Using 3D mapping software to render density to height you can see the height of the AM and FM dots relative to the solid in these 4 views:
For the same final tone value on the press sheet, it's clear that the FM dots carry less ink than the solids and the AM screen.
best, gordon p
Thanks Gordon,
Now how about fount solution ? If ink film thickness is lower then could we lower the fount solution too on the press ? Logic behind is that the paper is less wet and more on drier side and resultant low fan out .
We are using 1200 SPI so @42 Micron would be the spot on the newsprint (as we are resolving 2x2 checkerboard pattern). I just afraid about linting because of the ink splitting: which should be different then the AM screeing.
We are using high GCR (GCR4): in that case black ink would be little bit higher then the normal setup. Does it affect the ink splitting from blanket to paper while using higher GCR ?
Other then that is it ture that old blanket becomes more tackier then the new blanket ?
CMYK ink sequence
black we are using last may be due to no doubling for the last ink setup. On the new printing press (GOSS: cold set) we observe much more linting in cyan color: do you think we should check the tack of cyan ink or try to contact the ink company and find the reason that whether the tack is the factor for linting?
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