Fibre-based solution for caps in development

PulPac has been developing a fibre-based cap, which will be presented publicly for the first time at interpack 2026.

Building on years of experience in dry moulded fibre, PulPac is now advancing fibre-based alternatives in the caps and closures category. These new caps are designed to meet the functional and consumer expectations typically associated with plastic alternatives, while moving towards a fibre-based solution.

Early tests indicate promising performance across several key parameters, including thread engagement, opening and closing functionality, sealing architectures, and overall tactile experience. The caps also enable a high level of design flexibility, including the ability to differentiate the inside and outside of the cap, opening new possibilities for both function and brand expression.

The development is being carried out together with PA Consulting and in close dialogue with industry stakeholders, including PulPac’s designated machine partner for this segment, Optima. It also builds on ongoing work within the Bottle Collective initiative, where complete fibre-based bottle systems, including closures, are being explored and evaluated as integrated solutions, with participation from several global brand owners and packaging players.

Early versions of the caps have already been produced and tested in applications as part of its ongoing bottle and packaging evaluations.

“At PulPac, we focus on creating value both in what can be realised today and what comes next in packaging. Advancing fibre-based caps is a natural step in that journey,” said Charlotte Walldal, Chief Technology Officer at PulPac. “When we show the cap to customers, the reaction says a lot. The first response is often disbelief that they’re made from fibre. The look, the sound when you tap it against a tabletop, and especially the tactile feel challenge expectations of what fibre can be. It’s unexpected and something you need to experience firsthand to fully understand.”

The caps will be on display at both PulPac and Optima’s booths at interpack 2026 from 7–14 May in Dusseldorf.