METHOD OF PRODUCING DISSOLVING PULP, DISSOLVING PULP AND USE OF METHOD

A method of producing dissolving pulp from a recycled fibrous feedstock. The method comprises providing a fibrous material comprising cellulose, lignin and hemicellulose, said fibre source further having a lignin content of 0.1 to 7% lignin and an ash content of up to 3%; subjecting the fibrous mate...

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Bibliographische Detailangaben
Hauptverfasser:	SIVONEN, EINO, HARLIN, ALI, MÄÄTTÄNEN, MARJO, VALTA, KYÖSTI, ASIKAINEN, SARI
Format:	Patent
Sprache:	eng ; pol
Schlagworte:	APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS APPARATUS THEREFOR CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS IMPREGNATING OR COATING OF PAPER NATURAL OR ARTIFICIAL THREADS OR FIBRES PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS PULP COMPOSITIONS REGENERATION OF PULPING LIQUORS SPINNING TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Beschreibung
Zusammenfassung:	A method of producing dissolving pulp from a recycled fibrous feedstock. The method comprises providing a fibrous material comprising cellulose, lignin and hemicellulose, said fibre source further having a lignin content of 0.1 to 7% lignin and an ash content of up to 3%; subjecting the fibrous material to an alkaline extraction at a temperature of about 0 to 25° C., to produce fibres having a reduced content of hemicellulose; subjecting the fibres thus obtained to a bleaching treatment carried out with oxidative chemical reagents in order to reduce the lignin content of the fibres; and recovering the fibres thus obtained. By means of the method, dissolving pulp can be produced from recycled paper and cardboard products.