High rulings/Stochastic problems: causes and fixes
12 High rulings/Stochastic problems in offset printing and finishing: symptoms, probable causes, step-by-step fixes and prevention.
High rulings/Stochastic · TPG-011
Dot gain soars at high screen rulings
The print comes out far darker than the proof; plugged midtones despite correct densities
High rulings/Stochastic · TPG-012
Highlight loss (the dot won't print)
Gradients start abruptly: the 2-3% disappears and a visible step appears
High rulings/Stochastic · TPG-013
Plugged shadows (loss of dark detail)
From 85% to 100% everything looks the same: shadow detail disappears
High rulings/Stochastic · TPG-016
Accelerated plate wear at high rulings
Highlight loss mid-run; the job starts well and degrades
High rulings/Stochastic · TPG-017
Critical ink-water balance in stochastic
Stochastic is unforgiving: small water variations produce visible color shifts
High rulings/Stochastic · TPG-018
The paper won't support the chosen ruling
Mottling, irregular dot and loss of detail even though press and plates are correct
High rulings/Stochastic · TPG-019
Blankets and rollers unsuited to fine screens
Dirty dot, fill-in between dots or irregular transfer only on high-ruling jobs
High rulings/Stochastic · TPG-020
Color proof that doesn't match the production ruling
The approved proof doesn't represent press output: different color and detail
High rulings/Stochastic · TPG-022
Registration insufficient for high rulings
Colors out of register that were tolerable at 150 lpi and ruin the job at 250 lpi
High rulings/Stochastic · TPG-014
Moiré with conventional high-ruling screens
Interference pattern visible in images, especially fabrics, fine textures and gradient backgrounds
High rulings/Stochastic · TPG-015
Grainy or 'sandy' look in stochastic
Skies, soft gradients and skin tones show visible grain, like noise
High rulings/Stochastic · TPG-021
Visible transition in hybrid screening
A line or texture change is visible where the system switches from FM to AM