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The demands placed on industrial metal printing are constantly rising. Today’s market requires highly finished metal packaging with maximum process reliability, high energy efficiency and flexible production options. At the same time, sustainability, material efficiency and high-quality finishing effects are becoming increasingly important.
UV and LED technologies have established themselves as key curing methods in modern metal packaging printing. They enable the immediate curing of inks, varnishes and coatings straight after application, thereby creating the conditions for stable, cost-effective and highly productive production processes.
Modern UV systems are now used in a wide variety of applications – from traditional tinplate sheets and coil coating to thermoformed packaging, lids, closures and aluminium substrates.
A key advantage of UV curing lies in the immediate cross-linking of the ink and coating systems used. Unlike conventional thermal drying processes, curing takes place chemically rather than through evaporation.
This results in significant benefits for sheet metal printing:
As no solvents or water need to evaporate, there are also no shrinkage effects in the varnish or ink layer. This ensures very high print quality and stable surface properties – particularly with demanding finishes.
Modern UV systems also allow for precise control of the curing power. The energy applied can be precisely tailored to specific ink, varnish and material combinations. This improves process reliability whilst reducing energy consumption.
Visual and tactile effects are becoming increasingly important in packaging design. Matt and gloss effects, textured surfaces and special coatings attract attention at the point of sale and enable high-quality products to stand out clearly from the competition.
UV technology offers maximum flexibility in this regard. Even sophisticated finishing effects can be achieved reliably at high production speeds. In addition, excimer technology is becoming increasingly important in metal packaging printing. Curing under reduced oxygen conditions produces extremely matt surfaces with high mechanical resistance. These soft-touch and ultra-matt effects are used in particular for premium packaging.
UV technologies are also undergoing continuous development in specialist applications. In the field of tin can manufacturing, for example, UV curing of rim coat applications on the base of the can is becoming increasingly important. Protective coatings can be cured with precision, energy efficiency and process reliability.
Furthermore, modern UV systems now enable direct coating on certain metal substrates without the need for an additional adhesion primer. At the same time, LED-UV base coats are already available, which have been specially developed for energy-efficient LED-UV curing processes.
Hybrid production concepts, which combine UV, LED, IR and hot-air technologies, offer additional flexibility. This allows a wide variety of coating systems to be efficiently integrated into existing production processes.
Thermoformed or mechanically formed metal packaging presents particularly demanding requirements. During the forming process, the ink layer must be neither too brittle nor too elastic.
A precisely calibrated UV dose is therefore crucial to reliably prevent paint cracking, fissuring or bleeding. Modern UV systems allow the radiation output to be precisely adjusted to the material, geometry and ink system, thereby ensuring maximum process stability even with complex packaging shapes.
Alongside conventional UV systems, LED technology is becoming increasingly established in industrial sheet metal printing. Modern water-cooled LED systems enable energy-efficient curing whilst reducing heat input.
Particularly with temperature-sensitive materials or complex coating systems, LED technology offers significant advantages in terms of energy efficiency, system availability and maintenance requirements.
Furthermore, intelligent control systems ensure that UV output is automatically adjusted to the respective production conditions. This allows for the continuous optimisation of energy consumption and process quality.
In digital metal packaging printing, too, the demands placed on modern curing systems are increasing. Today, multi-stage LED concepts are frequently used, combining LED pinning immediately after inkjet application with subsequent LED final curing.
LED pinning stabilises the ink droplets immediately after printing, thereby improving the print image, edge sharpness and register accuracy. The final LED curing then ensures complete cross-linking of the ink systems.
In combination with FREEcure protective coatings, this creates high-performance complete systems for low-migration packaging applications. Our FREEcure system enables low-photoinitiator or photoinitiator-free UV curing and minimises potentially migrating substances – a decisive advantage, particularly for sensitive packaging applications.
Sustainability is one of the most important drivers of innovation in metal packaging printing. In addition to the high recyclability of tinplate and aluminum, the energy efficiency of production processes is coming into sharp focus.
UV and LED technologies make a significant contribution in this regard:
At the same time, digitalization, automated process control, and data-driven production optimization are continuously driving the development of modern printing and coating lines.
Industrial sheet metal printing is increasingly evolving into a highly automated and energy-efficient production environment. In addition to traditional offset applications, hybrid production concepts, LED technology, and digital printing systems are steadily gaining importance.
There is a demand for flexible and reliable solutions that combine the highest print quality, sophisticated finishing, and sustainable production.
UV and LED technologies thus remain central key technologies for the future of modern metal packaging.