Flexo Technology
Achieving consistency through control in the modern flexo pressroom
By Michael Baines, technical services engineer, Sandon Global A
chieving consistent, high-quality fl exo print has never depended on a single piece of equipment or one quick adjustment on press. It comes from understanding the process, controlling variables and maintaining disciplined working practices throughout production. Over the years, fl exo technology has advanced
signifi cantly. Presses are faster, print quality is higher and process control tools are far more sophisticated than they once were. However, despite these developments, the fundamentals of good printing remain largely unchanged. For printers today, consistency still starts with getting the basics right.
PROCESS CONTROL BEGINS WITH FUNDAMENTALS
Correct viscosity, stable inking and accurate impression settings remain central to achieving reliable print performance. If any one of these areas is out of specifi cation, the impact can quickly be seen in print quality, colour consistency and press effi ciency.
There is often a tendency to search for complex explanations when issues arise, but many problems can still be traced back to core process settings. Even small fl uctuations in viscosity will infl uence ink transfer. Excessive impression can lead to distortion and unnecessary wear, while unstable inking introduces variation across the web. A controlled process creates the foundation for everything else on press.
WHY MEASUREMENT MATTERS Consistency cannot be achieved without measurement. Modern fl exo printing relies heavily on data and repeatability, particularly as customer expectations around quality and colour accuracy continue to increase.
Monitoring viscosity, density, dot gain and impression settings provides printers with measurable benchmarks that can be repeated from job to job. This not only improves print consistency but also reduces set-up times and unnecessary waste.
set-up. This becomes even more important as converters work with recyclable substrates and alternative ink systems, both of which can introduce new challenges on press. Thorough testing and data capture are essential when introducing new materials. Understanding how substrates, inks and anilox specifi cations interact under production conditions allows printers to make informed decisions and avoid unnecessary disruption during live jobs.
ONE OF THE MOST IMPORTANT ELEMENTS WITHIN THIS PROCESS IS THE ANILOX. The engraved volume of the anilox, measured in cm³/m² or BCM, directly controls ink transfer to the plate. Without tight control of this volume during manufacture, and proper maintenance in the pressroom, maintaining consistent print becomes increasingly diffi cult.
Most printers now use some form of volumetric measurement system, which is a positive step forward for the industry. However, consistency in how measurements are taken is equally important. Standard operating procedures, correct lens selection and repeatable measurement methods all contribute to more accurate analysis and better process control.
Regular volume checks following cleaning also provide valuable insight into anilox performance over time. Monitoring wear, including changes to cell wall structure, helps identify when refurbishment or replacement may be required before print quality is aff ected.
REDUCING WASTE THROUGH CONSISTENCY Waste remains one of the biggest challenges facing the fl exo industry today. Rising material costs, environmental pressures and increasing sustainability expectations mean printers are under constant pressure to improve effi ciency. Reducing waste begins with reducing variation.
A stable, controlled process minimises unnecessary substrate usage, reduces downtime and supports faster, more predictable press
THE IMPORTANCE OF MAINTENANCE AND HOUSEKEEPING
Good housekeeping still plays a major role in pressroom performance.
Daily anilox cleaning and planned maintenance routines help maintain stable ink transfer and reliable machine operation. Clean presses not only produce more consistent print, but they also experience fewer mechanical issues and less unplanned downtime. Too often, cleaning is viewed as time away from production, when, realistically, it is a critical part of maintaining production effi ciency. Structured maintenance routines, combined with regular performance checks, help extend the life of key components and improve long- term repeatability across jobs.
LOOKING AHEAD
Flexo has evolved enormously over the past four decades. The move from basic graphics to high-defi nition print quality has been driven by advances in photopolymer plates, chambered doctor blade systems and increasingly sophisticated anilox engravings. Looking ahead, automation, process data and AI are likely to play a greater role in further improving effi ciency and reducing waste. However, regardless of how advanced technology becomes, the fundamentals of good printing will remain the same.
Consistency will always come back to process control, measurement and attention to detail.
42
May/June 2026
www.convertermag.com
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