METHOD AND DEVICE FOR PRODUCING A MICROFIBRILLATED CELLULOSE FILM

• Main Authors: Karppinen, Anni, Backfolk, Kaj, Nylén, Otto
• Format: Patent
• Language: English
• Published: 27.02.2024
• Subjects: ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CORRECTING FLUIDS; DYES; FILLING PASTES; GENERAL PROCESSES OF COMPOUNDING; IMPREGNATING OR COATING OF PAPER; INKS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MEASURING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NANOTECHNOLOGY; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; PHYSICS; POLISHES; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TESTING; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; USE OF MATERIALS THEREFOR; WOODSTAINS; WORKING-UP

A method of producing a microfibrillated cellulose, MFC, film from an MFC dispersion, comprises subjecting a wet MFC film (F) on a support to at least one drying step to form a dry MFC film (F'), measuring at least one parameter indicative of a concentration of at least one component, such as an additive or an impurity, and performing at least one of the tasks:i) adjusting at least one production parameter which influences the concentration of said at least one component in response to said at least one parameter, andii) recording said at least one parameter for each of said data points to provide a chemical map of the dry MFC film (F'), comprising a plurality of data points which are each associated with a respective position on the dry MFC film (F').