Siegwerk launches Cirkit Novaseal heat seal lacquer portfolio for fiber-based, flexible packaging

GLOBAL – Siegwerk has launched the Cirkit Novaseal heat seal lacquer portfolio for fiber-based and flexible packaging, unifying its heat sealing expertise to deliver consistent sealing, hot-tack performance, and bond strength.

The portfolio brings together Siegwerk’s circular economy strategy and heat sealing expertise, integrating know-how and technologies gained through its acquisition of Allinova.

Gilles Le Moigne, head of Circular Economy Coatings at Siegwerk, explained that Cirkit Novaseal is a key milestone in strengthening the company’s coatings offering for sustainable packaging, adding that by unifying heat sealing expertise under one strong product brand, Siegwerk makes it easier for customers to navigate performance requirements while aligning with circular economy goals.

Heat Seal Lacquers in Packaging

Heat seal lacquers are coatings applied to packaging substrates (paper, board, film) that activate under heat and pressure, creating a bond without adhesive. 

Unlike solvent-based adhesives, heat seal lacquers do not require drying tunnels, reducing energy consumption and line length. 

Unlike water-based adhesives, they do not introduce moisture that can warp paper substrates. For fiber-based packaging, heat seal lacquers are critical for forming seals on paper bags, pouches, and cartons where plastic lamination is being eliminated. 

The Cirkit Novaseal portfolio includes multiple product characteristics and performance profiles, such as solutions for gravure and flexographic printing and different sealing temperature requirements.

Performance at Speed

The product range includes variants with low seal initiation temperatures for efficient processing, hot tack performance for high-speed packaging lines, and high bond strength at low coating weights to support converting processes. 

Low seal initiation temperatures allow seals to be formed at lower heat, reducing energy costs and enabling the use of heat-sensitive substrates. 

Hot tack refers to the strength of the seal immediately after sealing, before it cools; high hot tack is essential for vertical form-fill-seal lines where the seal must hold while the filled package drops. 

Low coating weights reduce material consumption and cost while maintaining seal integrity, a critical balance where too little coating fails to seal and too much adds waste.

A Structured Portfolio for Easier Selection

Siegwerk’s structured portfolio approach aims to help converters select the right lacquer based on application method, performance needs, and end-use requirements. 

A converter printing on a gravure press needs a lacquer that transfers from engraved cylinders; a flexo converter needs a lacquer that meters through an anilox roll. 

The Cirkit Novaseal portfolio provides options for both, reducing the number of lacquer SKUs a converter must stock.

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