Mondi has partnered with UK-based biomaterials developer Kelpi and sachet manufacturer Guardpack to conduct early-stage trials of seaweed- and paper-based materials for wet wipe and liquid-filled sachet packaging. The initiative reflects growing efforts within the packaging sector to address the environmental limitations of conventional plastic sachets, which remain difficult to recycle through existing waste collection systems.
The collaboration includes parallel development pathways. Mondi and Guardpack are evaluating a recyclable paper-based sachet structure for wipe applications, with early work focused on achieving adequate barrier performance, reliable sealing, and shelf stability while improving end-of-life outcomes. This development remains at an initial evaluation stage.
Alongside this, Kelpi’s seaweed-derived coating technology is being tested on paper substrates to deliver the barrier properties required for liquid-filled products without relying on conventional plastic layers. Guardpack is assessing the coated paper material on its production lines to examine machinability, sealing consistency, and print quality under commercial conditions.
Following initial production-line trials, the coated paper material has progressed to further laboratory testing, with a second production trial scheduled for February. The trials are intended to determine whether the material can meet performance, scalability, and operational requirements for commercial sachet manufacturing.
Guardpack is also calculating its Scope 1, 2 and 3 carbon emissions as part of a broader effort to establish baseline data and guide future material and packaging decisions. This data-driven approach is supporting a transition towards non-fossil-based materials in response to regulatory developments affecting wipes and flexible packaging.
Seaweed is being assessed as a feedstock due to its renewable characteristics and low resource requirements, as it grows without the need for fertilisers, agricultural land, or fresh water. The partners report increasing interest from brand owners seeking sachet packaging solutions that align with regulatory change, sustainability objectives, and practical production requirements