PulPac is developing fibre-based caps as an alternative to plastic closures, with the new designs set to be shown publicly for the first time at interpack 2026.
The caps are aimed at replacing one of the most widely used plastic components in packaging. Developed using the company’s Dry Molded Fiber technology, the closures are designed to meet the functional and consumer expectations typically associated with plastic caps while shifting the material to fibre.
Early tests indicate performance across several areas, including thread engagement, opening and closing functionality, sealing architectures, and tactile feel. The caps are also designed to allow differentiation between the inside and outside of the closure, which the company says opens opportunities for both function and brand design.
The development is being carried out with PA Consulting and in collaboration with industry stakeholders, including Optima, PulPac’s designated machine partner for the segment.
It also builds on work within the Bottle Collective initiative, which explores fibre-based bottle systems, including closures, with participation from global brand owners and packaging companies.
Early versions of the caps have been produced and tested in real-life environments as part of bottle and packaging evaluations.
Charlotte Walldal, chief technology officer at PulPac, said advancing fibre-based caps is a logical step for the company.
“At PulPac, we focus on creating value both in what can be realised today and what comes next in packaging. Advancing fiber-based caps is a natural step in that journey,” she said.
“When we show the cap to customers, the reaction says a lot. The first response is often disbelief that they’re made from fiber. The look, the sound when you tap it against a tabletop, and especially the tactile feel challenge expectations of what fiber can be.”
The caps will be shown at both the PulPac and Optima stands at interpack, alongside other dry moulded fibre developments.
PulPac will exhibit in hall 8b at stand C53 at interpack.
