From Visual Identity to Technical Functionality: The Evolution of Printing in Flexible Packaging
The New Role of Functional Inks
Siegwerk is introducing a new approach to functional packaging design with the launch of CIRKIT OXYBAR WHITE — a solution for film-based packaging that combines oxygen barrier performance with white ink opacity in a single printable layer. This means that a function traditionally provided by a separate material layer can become an integrated property of the ink itself.
Designed for flexible films, the solution addresses one of the key challenges in modern packaging design: how to combine reliable product protection with high-quality printing without adding complexity to the packaging structure.
Two Functions, One Layer: Simplifying Film Structures
In conventional film packaging, oxygen protection and white opacity are provided by separate components. Oxygen barrier performance is typically achieved through materials such as EVOH, PVdC, aluminium foil or metallised films, while white ink is applied as a separate layer to provide the required opacity and print quality.
CIRKIT OXYBAR WHITE combines these two functions in a single layer. By integrating high-performance oxygen barrier properties directly into the white ink, flexible packaging manufacturers can achieve both protection and visual quality in a single application.
The coating delivers a high level of oxygen protection together with a bright, opaque white finish suitable for demanding flexible packaging applications. According to Siegwerk, the technology achieves an oxygen transmission rate (OTR) of below 5 cc/m²/day at 50% relative humidity.
This “two layers into one” approach allows both the traditional barrier layer and the standard backing white layer to be replaced by a single functional coating. It can be applied inline using standard flexographic and gravure printing processes, with the option of using water-based systems.
Designed for High-Performance Applications
CIRKIT OXYBAR WHITE has been developed to meet the requirements of modern flexible packaging production. Its high solids content enables faster drying and potentially higher printing speeds compared with conventional water-based oxygen barrier coatings.
By integrating barrier functionality directly into the white ink layer, the solution can be incorporated into existing production lines without the need for additional coating steps or capital investment.
At the same time, the pigmented white layer enables visual inspection of the applied coating during printing. This facilitates in-line quality control and can help reduce the risk of defects.
From Added Materials to Integrated Printing Performance
The innovation forms part of Siegwerk’s broader Barrier Inks concept, in which barrier protection becomes an intrinsic property of the printed layer rather than a function provided by a separate material component.
This represents a shift in the way film packaging can be engineered. Instead of achieving the required performance by adding further materials and layers, manufacturers can integrate part of that functionality directly into the printing process.
In practice, this can mean fewer layers, simpler structures, fewer production steps and more efficient use of materials — while maintaining the required barrier performance.
Proven in Monomaterial Packaging Applications
The concept has already been validated through Siegwerk’s collaboration with Enplater to develop a fully recyclable mono-PP pouch. In this project, CIRKIT OXYBAR WHITE was incorporated into a structure designed to combine high technical performance with recyclability.
In the specific application, the technology enables conventional oxygen barrier materials such as PVdC, metallised structures and EVOH to be avoided in applications that do not require an additional water vapour barrier. The standard backing white layer is transformed into a functional barrier layer, eliminating the need for a separate barrier structure.
The resulting mono-PP structure combines high barrier performance with full recyclability, demonstrating how functional inks and specialised packaging technologies can support the transition from complex multilayer structures to simpler monomaterial solutions.
For flexible packaging manufacturers, an important advantage is that this approach does not require additional production steps or investment in new equipment.
More Efficient and Recyclable Flexible Packaging
By combining white ink and oxygen barrier functionality in a single layer, CIRKIT OXYBAR WHITE offers several practical benefits across the value chain:
- Simplified structures through a reduced number of layers
- Greater production efficiency through one-pass application
- Reduced material consumption and fewer processing steps
- Opportunities for simpler monomaterial structures
- Support for the transition towards more recyclable flexible packaging solutions
It is precisely this combination of functionality, production efficiency and recyclability that makes such technologies an important area of development for flexible packaging.
As regulatory requirements and market expectations continue to accelerate the transition towards a circular packaging economy, solutions that reduce structural complexity without compromising performance are becoming increasingly important.
A New Role for White Ink
CIRKIT OXYBAR WHITE demonstrates how white ink can evolve from a purely visual element into a functional component that actively contributes to product protection.
This represents a significant change in the role of printing in flexible packaging. The printed layer is no longer necessarily just a carrier for graphics. It can become part of the technical architecture of the package and contribute directly to its performance.
This creates a new role for functional printing: rather than adding new layers to achieve the required properties, each existing layer can be engineered to perform more than one function.
This is the direction in which functional ink technology is evolving — from printing that presents and communicates the product to printing that also contributes to protecting it.