Siegwerk unveils new acrylic-free ink solution UniLeaf

Siegwerk has introduced UniLeaf, a new acrylic-free ink for water-based flexo printing on paper and board. With an innovative formulation approach, it delivers substantial gains in renewable content, significant reductions in carbon footprint, improved energy efficiency and strong alignment with market and regulatory requirements. This makes UniLeaf a valuable option for converters, printers and brand owners seeking to enhance sustainability while maintaining high performance and operational efficiency.

UniLeaf, which stands for 'Low Energy Acrylic Free', is built on Siegwerk’s widely used UniNature product range, which is already formulated with regenerative raw materials. UniLeaf advances this principle to a new level by completely replacing conventional acrylic resins with polymers derived from regenerative, bio-based raw materials. 'This represents a fundamental shift in the formulation of water-based flexo inks,' said Thibaud Liard, business unit head paper and board, EMEA, at Siegwerk. 'By removing acrylic resins, UniLeaf breaks with long-standing industry conventions and establishes a new approach for sustainable ink design.'

At the same time, the formulation integrates seamlessly into existing production processes. The bio-based resin system can be incorporated into standard ink-manufacturing operations without requiring major investments in production technology. Manufacturing efficiency and finished-product quality remain unchanged, allowing producers to adopt the innovation without disrupting established workflows. 

The new formulation concept has been validated in initial industrial trials, in which UniLeaf was compared directly with Siegwerk’s own UniNature, a sustainable and high-performing product series. The results show a reduction in CO2 footprint by an additional 50 percent achieved by UniLeaf, marking a transformative improvement in the sustainability profile of water-based flexo printing inks.

This is driven by a major increase in the share of biogenic carbon in the formulation, as UniLeaf more than doubles it by completely removing acrylic resins. UniLeaf offers another significant sustainability advantage through reduced energy consumption during drying. Industrial trials confirm energy savings of more than 15 percent versus UniNature, all while maintaining the same production speed.

'With these benefits combined, our new formulation supports converters, printers, and brand owners in meeting their sustainability targets while improving operational costs. At the same time, it helps them prepare for evolving regulatory requirements across the printing and packaging value chain,' said Thomas Lehnen, head of technology paper and board, EMEA, at Siegwerk.