METHOD FOR MANUFACTURING A BARRIER FILM, AND A BARRIER FILM

The present invention relates to a process for manufacturing a barrier film, wherein the method comprises:- providing an aqueous suspension comprising at least 70 weight-% highly refined cellulose pulp having an SR value of 70-95 and having a content of fibers having a length >0.2 mm of at least...

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Bibliographische Detailangaben
Hauptverfasser:	Kauppi, Anna, Backfolk, Kaj, Lyytikäinen, Katja, Nordström, Tommi, Heiskanen, Isto
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING IMPREGNATING OR COATING OF PAPER INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PERFORMING OPERATIONS PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TEXTILES TRANSPORTING TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	The present invention relates to a process for manufacturing a barrier film, wherein the method comprises:- providing an aqueous suspension comprising at least 70 weight-% highly refined cellulose pulp having an SR value of 70-95 and having a content of fibers having a length >0.2 mm of at least 10 million fibers per gram based on dry weight:- forming a wet web:- dewatering and/or drying to form a substrate:- calendering said substrate in at least one soft calender nip:- providing said substrate with at least one first layer of a barrier chemical to form a coated substrate, wherein each first layer has a coat weight of 0.5-5 gsm, and wherein a total coat weight on of the first layers is ≤8 gsm, and- drying to form said barrier film having a thickness of