A method for laminating wet microfibrillated cellulose (MFC) films to wet multiply paperboard via wet pressing to create renewable barrier materials without adhesives.

Patentradars sammanfattning

This invention describes a wet lamination process for producing barrier laminates by applying a wet MFC film (2-50 wt% dry content) to a wet multiply paperboard web (20-58 wt% dry content) through wet pressing, followed by drying to at least 85 wt% dry content. The wet-on-wet approach avoids adhesive-related challenges, reduces curl and shrinkage issues, and improves layer-layer contact through fine redistribution at the boundary interface. The resulting laminate combines renewable, biodegradable MFC barrier films with paperboard substrates, delivering oxygen, grease, and water vapor barrier properties suitable for sustainable packaging applications.

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