SIG and PulPac Join Forces to Scale Sustainable Paper-Based Closures

SIG has entered a strategic partnership with PulPac, the global leader in Dry Molded Fiber technology, to jointly develop and scale the next generation of paper-based closures for aseptic carton packaging. This exclusive collaboration marks a major step toward SIG’s goal of increasing the paper content in its aseptic cartons to 90%—including the closure—by 2030.

As part of its mission to create fully regenerative food packaging systems, SIG is steadily raising the renewable content of its cartons to reduce reliance on fossil-based materials and lower carbon emissions. In 2024, the company targets achieving 85% paper content (excluding closures) and aims to surpass 90% by 2030 with the introduction of fiber-based closures.

Advancing Fiber-Based Innovation with Dry Molded Fiber Technology

PulPac’s patented Dry Molded Fiber process forms products from a dry web of fibers rather than traditional fiber slurries. This method drastically reduces water use and offers significant environmental benefits, including reduced CO₂ emissions and enhanced production efficiency. The technology enables precise, scalable manufacturing and delivers outstanding design flexibility.

“We believe in Dry Molded Fiber as one of the most scalable and sustainable alternatives to plastic,” said Gavin Steiner, Chief Technology Officer at SIG. “Our new closures will feature both a paper-based base and cap, further increasing the already high proportion of paper in our aseptic cartons, while maintaining the convenience and performance consumers expect.”

Designed for Seamless Integration with Existing Systems

SIG’s current process involves applying closures after cartons are filled and sealed in a sterile environment—ensuring product safety and aseptic integrity. This post-application system enables future paper-based closures to be integrated without altering the existing filling lines or processes, offering a seamless “plug-and-play” upgrade.

“True packaging innovation must align with installed manufacturing systems to drive real impact,” said Christoph Wegener, Chief Markets Officer at SIG. “That’s why all our solutions are designed for compatibility. Our vision is to combine paper-based closures with our aluminum-free cartons, paving the way to 90% paper content—setting a new industry benchmark in circular, sustainable packaging.”