SIG has partnered with PulPac to develop paper-based closures for aseptic cartons, aiming for large-scale production of caps and bases using Dry Molded Fiber technology. Announced on 22 July 2025, the exclusive programme seeks to match the performance of conventional plastic closures.
The collaboration supports SIG’s commitment to reach 90 % paper content in its aseptic cartons by 2030, with an interim goal of 85 % paper content (excluding closures) in 2025. Dry Molded Fiber forms a dry web of cellulose fibers, reducing water use and lowering carbon dioxide emissions compared with plastic, while enabling high-volume output and integration with existing filling and closure equipment.
Gavin Steiner, Chief Technology Officer at SIG, said, “We believe in Dry Molded Fiber technology, paving the way for innovative and responsible alternatives to plastic closures.” Christoph Wegener, Chief Markets Officer at SIG, added, “Plug-and-play solutions are an absolute design principle for us, enabling sustainability innovations without altering existing machinery.”
The paper-based closures will be applied after aseptic sealing, offering a plug-and-play approach without changes to the production line. The programme is managed by SIG and PulPac teams. Once developed, the technology is expected to replace a significant volume of plastic closures annually.