A METHOD FOR PRODUCING A LAMINATE, AND A LAMINATE

• Main Authors: Karppinen, Anni, Backfolk, Kaj, Nylén, Otto
• Format: Patent
• Language: English
• Published: 09.01.2024
• Subjects: IMPREGNATING OR COATING OF PAPER; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; METHODS OF PRODUCING PAPER THEREON; NANOTECHNOLOGY; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PAPER-MAKING MACHINES; PERFORMING OPERATIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TEXTILES; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

The present invention relates to a method for producing a laminate comprising a paper substrate and a microfibrillated cellulose (MFC) layer. An MFC suspension comprising 25-90 weight-% of MFC and 10-50 weight-% of a filler component is provided. The suspension has a dry content of 2.5-50 weight-%. A wet MFC layer is formed by casting the suspension on a metal belt support. A paper substrate having a Gurley Hill air permeability value of less than 10000 s/100 ml is provided and joined with the wet MFC layer positioned on the metal belt support to form a laminate structure. The laminate structure positioned on the metal belt support is subjected to water removal to form the laminate. The water removal comprises at least one drying step which comprises drying by at least one non-contact drying device, wherein the metal belt support is heated during the at least one drying step. The invention relates also to a laminate and a packaging material comprising the laminate.