Walki®Line
Innovation in Barrier Liners for Corrugated Board
Advanced fibre-based barrier solutions designed for recyclable, high-performance corrugated packaging.
Protect products. Strengthen corrugated board. Enable circular solutions.
Corrugated board is widely used across supply chains, but moisture, grease and mechanical friction can quickly weaken its performance. When exposed to humidity, oils or demanding transport conditions, standard liners may lose compression strength, leading to damaged products and unstable pallets.
Walki®Line barrier liners are engineered to enhance the durability and functionality of corrugated packaging while supporting circular packaging systems.
These fibre-based barrier materials can replace conventional liners such as kraftliners or testliners while adding functional protection against:
- Moisture and humidity
- Grease and fats
- Technical oils and chemicals
- Surface scratches and abrasion
Walki barrier liners can be used as inner liners, outer liners, or both in standard corrugating processes, enabling converters to integrate advanced protection directly into the box structure.
The result is stronger, cleaner and more reliable packaging, with solutions designed to be recyclable in standard paper waste streams.
Barrier solutions designed for performance, compliance and industry needs.
Customised Barrier Solutions
Walki offers extensive flexibility in barrier liner design to meet specific packaging requirements.
Converters can customise:
- Barrier properties (moisture, grease, oil)
- Coating technology (PE, PET, dispersion coating)
- Surface properties (smooth, anti-abrasive, matte)
- Printability and branding options
- Substrate selection
- Roll width and size (up to 3 metres)
This flexibility allows converters and packaging designers to create optimised corrugated structures tailored to each product and supply chain.
Designed for PPWR Compliance
The EU Packaging and Packaging Waste Regulation (PPWR) will introduce stricter recyclability and circularity requirements for packaging materials.
Walki barrier liners are designed to help converters prepare for these regulations. Key benefits:
- Fibre-based structures
- Designed for recycling in paper streams
- Reduced plastic content options
- Compatible with circular packaging systems
- Supports fibre-based packaging alternatives
Dispersion coated solutions such as Walki®EVO Line and Walki®Line Jazz are particularly aligned with the future direction of EU packaging regulation.
Industries and Users
Corrugated board converters
Integrate barrier functionality directly into box structures.
Board producers
Develop functional corrugated board solutions for demanding applications.
Packaging manufacturers
Create specialised transport packaging for food and industrial goods.
Logistics and warehouse operators
Improve packaging durability during storage and transportation.
Traders and brand owners
Ensure product protection while supporting sustainable packaging goals.
Walki Experts
Watch Robert Björklind explain how Walki’s barrier lining solutions help solid and corrugated boards maintain strength in wet, greasy and demanding environments while protecting products, improving packaging performance and supporting recyclability in fibre-based packaging systems.
A complete portfolio of barrier liner solutions
Walki offers a versatile portfolio of barrier liner solutions designed to meet different performance requirements while supporting recyclable fibre-based packaging. The portfolio includes four main solution families that can be seamlessly integrated into corrugated board production while supporting recyclability and circular packaging systems.
Walki®Line Aqua /
Hydraplex
High moisture barrier fibre-based liners
Walki®Line Ultra /
Thermaplex
High-performance grease and technical barrier liners
Walki®EVO Line
Next-generation dispersion coating
Walki®Line Jazz /
Sellocoat
Classic dispersion coated recyclable liners
High moisture barrier fibre-based liners
Walki®Line Aqua / Hydraplex
Moisture-resistant barrier liner for fresh produce packaging
Walki®Line Aqua / Hydraplex is a fibre-based barrier liner with excellent water and moisture resistance, designed for demanding food and FMCG packaging applications.
Using PE coating or glue lamination between fibre layers, the material protects corrugated packaging from moisture while maintaining excellent printability and glueability.
Key benefits:
- Very good water and moisture barrier
- Suitable for food contact (dry, wet and greasy foods)
- Excellent printability and glueability
- Over 90% fibre content
- Available in white or brown
- Repulpable and recyclable in paper streams
Typical applications:
- Fruit and vegetable boxes
- Berries and fresh produce packaging
- Flower and plant boxes
- Fish and seafood packaging
- Detergent packaging
- FMCG transport packaging
Moisture Barrier for Detergent Pod Packaging
Walki®Line Aqua / Hydraplex provides reliable moisture protection for corrugated boxes used to pack detergent pods. The barrier liner helps maintain the strength and dimensional stability of the box even in humid storage and transport conditions. By integrating moisture resistance directly into the corrugated structure, converters can reduce the need for additional inner packaging such as plastic bags. The fibre-based solution also offers good printability, glueability and recyclability in standard paper waste streams.
Walki®Line Aqua / Hydraplex enables converters to develop fibre-based packaging solutions that replace plastic while maintaining strong barrier performance.
High-performance grease and technical barrier liners
Walki®Line Ultra / Thermaplex
High-performance barrier for grease, oils and sensitive products
Walki®Line Ultra delivers excellent grease, moisture and oil barrier properties, making it suitable for demanding food and industrial applications.
The material combines PET lamination with PE or glue bonding, creating a durable barrier while providing a smooth, protective surface.
Key benefits:
- Excellent grease and fat barrier
- Strong moisture protection
- Heat resistance
- Non-scratching surface
- Printable surfaces (paper or PET)
- Suitable for food and technical packaging
Typical applications:
- Meat and poultry boxes
- Fish and seafood packaging
- Bakery and fast-food packaging
- Automotive spare parts
- Electronics and scratch-sensitive products
The smooth PET surface also prevents abrasive damage, ensuring products remain clean and protected during transport.
Walki®Line Ultra Lite
Barrier liners with minimized plastic content
Walki®Line Ultra Lite delivers the same water and grease barrier protection as Walki®Line Ultra, with over 30% less plastic thanks to replacing PE with adhesive bonding.
Key benefits:
- PET-laminated barrier liner
- Reduced plastic content
- Heat resistant up to 250°C
- Excellent grease barrier
- Chemical resistance
- Printable surfaces
Typical applications:
- Automotive components
- Electronics
- Scratch-sensitive parts
- Industrial packaging
This structure enables direct packing on the PET surface without additional primary packaging.
dispersion coatING
Walki®EVO Line
Next-Generation Dispersion Coated Barrier Technology
Walki®EVO Line represents the latest generation of dispersion coated barrier liners, designed to deliver strong barrier performance.
This solution supports future packaging requirements by combining functional barrier protection with recyclability in paper waste streams.
Key benefits:
- Water-based barrier coating
- Medium to high barrier performance
- Recyclable and repulpable
- Printable and glueable
- Natural fibre-based appearance
Typical applications:
- Frozen food packaging
- Fresh produce packaging
- Sustainable retail packaging
Walki®EVO Line is designed to support converters preparing for future recyclability requirements and circular packaging targets.
dispersion coatING
Walki®Line Jazz / Sellocoat
Classic dispersion coated barrier liner
Walki®Line Jazz / Sellocoat is a dispersion coated fibre-based liner offering balanced moisture and grease barrier properties while maintaining recyclability.
The water-based barrier coating improves the durability of corrugated packaging without adding significant plastic content. Walki®Line Jazz offers a cost-efficient barrier solution aligned with circular packaging systems.
Key benefits:
- Recyclable and repulpable
- Good moisture barrier
- Medium grease resistance
- Natural matte paper surface
- Printable and glueable
Typical applications:
- Frozen food packaging
- Fresh produce boxes
- Flower and plant packaging
Barrier Liner Comparison
| Feature | Barrier type | Plastic content | Barrier performance | Applications |
|---|---|---|---|---|
| Walki®Line Aqua / Hydraplex | PE / Glue coating | Low | High moisture barrier | Fresh produce, seafood, detergent-pods |
| Walki®Line Ultra / Thermaplex | PET + PE | Low | High grease and moisture barrier | Food, automotive |
| Walki®Line Ultra Lite | PET + Glue | Reduced | High grease barrier | Food, Electronics, spare parts |
| Walki®Line Jazz / Sellocoat | Dispersion coating | Water-based barrier | Medium barrier | Frozen food, produce |
| Walki®EVO Line | Advanced dispersion coating | Water-based barrier | Medium-high barrier | Sustainable packaging |
A barrier liner is a specialised liner material integrated into corrugated board to protect packaging from moisture, grease, oils or physical abrasion.
They preserve the structural strength of corrugated boxes and prevent contamination or product damage during storage and transport.
Yes. Most Walki barrier liners are designed to be recyclable in standard paper waste streams, particularly dispersion coated solutions.
Barrier liners are widely used in food packaging, fresh produce logistics, automotive packaging, electronics transport and industrial supply chains.
By using fibre-based structures, reducing plastic content and enabling recyclability, barrier liners help converters prepare for upcoming EU packaging regulations.
Find the right barrier liner for your application
Work with Walki to develop barrier liner solutions tailored to your products, processes and sustainability targets. Our team supports you from material selection to implementation.
