METHOD FOR MANUFACTURING A BARRIER SUBATRATE, AND A BARRIER SUBSTRATE

The present invention relates to a process for manufacturing a barrier substrate, comprising the steps of:- providing a web comprising at least one first layer, which first layer comprises at least 30 weight-% highly refined cellulose fibers having a Schopper Riegler value of 60 - 95 SR° and/or at l...

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Bibliographische Detailangaben
Hauptverfasser:	BACKFOLK, Kaj, HEISKANEN, Isto, NORDSTRÖM, Tommi
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES FOR PAPER-MAKING MACHINES ADHESIVES AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CALENDERS CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON CORRECTING FLUIDS DYES FILLING PASTES GENERAL PROCESSES OF COMPOUNDING IMPREGNATING OR COATING OF PAPER INKS LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS POLISHES PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS 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
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Beschreibung
Zusammenfassung:	The present invention relates to a process for manufacturing a barrier substrate, comprising the steps of:- providing a web comprising at least one first layer, which first layer comprises at least 30 weight-% highly refined cellulose fibers having a Schopper Riegler value of 60 - 95 SR° and/or at least 30 weight-% microfibrillated cellulose (MFC), as calculated on the total dry weight of said first layer, which web has a first side and a second side and which web exhibits an air resistance (Gurley) of at least 1000 s/100 ml, preferably at least 2000 s/100 ml, as measured according to ISO 5636-5,providing a heated roll or a heated belt,applying at least one first composition comprising a polymer dispersed or dissolved in an aqueous medium on the first side of the web while the web is in contact with the heated roll or belt, in a first coating step, thereby providing the web with a first barrier layer forming a barrier coated web,optionally drying said web provided with the first barrier layer in a drying step.The invention relates also to a barrier substrate, a barrier substrate laminate with a polymer layer and a packaging material comprising the barrier substrate.