Digital printing requires a dedicated prepress workflow. This means that the most suitable solutions for data handling and colour management have to be chosen in order to achieve maximum operating efficiency.
The installation of a digital
printing press is not enough
as it is also necessary to
adjust the workflow
Electrostatic printing assist (ESA) generally improves print quality, since it helps to eliminate missing dots. But if the press operator has selected the wrong ESA system or uses it incorrectly, it can itself cause problems with gravure printing presses.
An ESA system in a
gravure printing station
This article describes a cleaning system (enpurex from bubbles & beyond) for anilox rollers and gravure cylinders tested under laboratory and field conditions by the Leipzig University of Applied Science at the recently established HTWK’s faculty iP³ Leipzig (Institute of Printing, Processing and Packaging, Leipzig/D).
The enpurex cleaning
innovation is a physical
cleaning principle which
works in three steps:
1 = Infiltration and diffusion
into the ink layer,
2 = Fragmentation of ink
3 = Removal after a water
Ultraviolet (UV) printing has been in mainstream use in labels and packaging for many years. It was adopted because of the many benefits it offered: fast curing for enhanced productivity, high colour strength for improved graphic reproduction, applicability with a wide range of substrates, absence of solvents and VOCs, high gloss and durable finishes.
Packaging continues to be a growth market, and within the packaging sector, flexible packaging is arguably the fastest growing segment. According to a Smithers Pira report (Future of Global Flexible Packaging to 2020), the global market for flexible packaging is projected to grow 18% by 2020.
Fixed ink set printed
image using CMYK + OGV
showing vivid colour
Wipf AG is the first beta user of an HP 20000 digital press designed primarily for printing on flexible packaging materials. The first samples were revealed at Interpack 2014 in Düsseldorf.
Wipf AG is the first beta
user of the digital printing
press HP 20000
When it comes to making a final decision on which printing process to choose for labels and packaging, the print service provider must take into consideration quality, substrate, volume, budget and schedule. These are the requirements that typically drive the choice of printing method.
The high number of products on the shelf makes the run length of packaging and labels shrink
The clogging of the cells of laser-engraved ceramic anilox rollers with contaminants and dried ink impairs the printing quality. This means that contaminated rollers need to be cleaned as soon as possible after printing. Different procedures are available for this purpose.
Cleaning procedures for
In general, package printing jobs are becoming shorter and shorter. Hence many printers struggle to produce in an economic way. Sebastian Reisig, former editor of Flexo & Gravure Global, visited Drukerij Zwart to find out how a printer became a producer of economic short run rotogravure printing jobs.
Harry Sieljes, Managing Director for Drukkerij Zwart BV
Lateral instability of the web may lead to several issues and as a consequence to rejects and claims from customers. An empirical study was completed to evaluate the impact of this complex problem on printing presses and converting equipment and how to solve them.
Lateral instability of the web may lead to several
issues and as a consequence to rejects and claims from customers
In certain cases a fixed colour palette offers cost savings and enhanced store shelf appeal. Yet, it is not an all-encompassing solution to all problems printers are facing these days.
comparison illustrates the
brighter colours possible
with expanded colour