SIG, PulPac partners to advance sustainable packaging with paper-based closures

SWEDEN – SIG, a leading provider of aseptic carton solutions, has joined forces with PulPac, a Swedish innovator in Dry Molded Fiber technology, to develop paper-based closures for SIG’s aseptic cartons. 

The collaboration aligns with SIG’s ambitious goal to increase the paper content in its packaging to 90% by 2030, reducing reliance on fossil-based materials and cutting carbon emissions.

According to SIG’s chief technology officer, Gavin Steiner, “Dry Moulded Fibre technology paves the way for innovative and responsible alternatives to plastic closures.”

“It’s a scalable solution with immense potential to accelerate the shift to paper-based packaging while maintaining the convenience and performance consumers expect.”

The partnership leverages PulPac’s technology, which forms a dry web of fibres, slashing water usage and emissions compared to traditional plastic production. 

This method also offers design flexibility and supports high-volume manufacturing, making it ideal for large-scale adoption.

The initiative focuses on creating closures that seamlessly integrate with SIG’s existing aseptic carton systems. In a statement, SIG’s chief markets officer, Christoph Wegener, emphasized the importance of compatibility: 

“For sustainable innovations to make a real impact, they must work with existing machinery. Our ‘plug-and-play’ approach ensures paper-based closures can be applied without disrupting production, paving the way for a circular economy.” 

This strategy builds on SIG’s aluminium-layer-free packaging, aiming for a breakthrough in achieving 90% paper content in full-barrier cartons.

For 2025, SIG targets 85% paper content in its cartons, excluding closures, as a stepping stone toward its 2030 vision. 

The post-application process for closures, applied after filling and sealing in an aseptic environment, ensures product safety and supports the transition to paper-based solutions without compromising functionality.

Earlier this month, the company launched one-litre aseptic cartons using Terra Alu-free + Full barrier material, eliminating the aluminium layer while maintaining a 12-month shelf life, according to industry reports. 

The innovation, now available in Germany with ALDI’s Rio d’oro grape juice, reduces the carbon footprint by 29% compared to standard cartons.

Additionally, a report by Packaging Europe highlights that SIG and PulPac aim to replace billions of plastic closures annually, scaling up production to meet global demand for eco-friendly packaging. 

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