An Introduction to Screening For Flexography

Spots, Dots, Rulings, Angles, Moires, and More

This is part one of a two part series on screening for flexography. In this “introductory level” presentation, we’ll look at some of the basics for flexo screening – including resolution, dot shapes, screen screen angles moires and more. Well conclude with a look at transitional (AM / FM) screens as well as cell patterns designed for ink transfer.

Key Take-Aways

• Colors are reproduced on a flexo press by “screens” of halftone dots of different sizes.
• The basic parameters of a screen are the dot shape, screen ruling, and the screen angle.
• The CTP device resolution has an impact on dot quality
• Two screening categories are AM and FM. Screens that combine these two are called transitional or “hybrid” screens.
• Screens can be made to transfer ink more uniformly by imaging smaller “cells” into the larger dots.

There will be a live Q&A session at the end of the presentation.

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