A METHOD AND A SYSTEM FOR PREVENTING CALENDER BLACKENING

There is disclosed a method for preventing calender blackening of a printing paper product, a system for preventing calender blackening of a printing paper product, and a printing paper product obtainable by the method. The method comprises feeding cellulose based material comprising mechanical pulp...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HAARLA, EERO, VARVEMAA, JANNE, SOLISMAA, PÄIVI, VUORI, MIKKO, FINNILÄ, KIMMO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	IMPREGNATING OR COATING OF PAPER PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Beschreibung
Zusammenfassung:	There is disclosed a method for preventing calender blackening of a printing paper product, a system for preventing calender blackening of a printing paper product, and a printing paper product obtainable by the method. The method comprises feeding cellulose based material comprising mechanical pulp to a system, feeding and admixing calcium hydroxide and carbon dioxide to the cellulose based fibres for precipitating calcium carbonate in a rhombohedral crystal form, and manufacturing a printing paper product comprising at least said cellulose based material and precipitated calcium carbonate in a rhombohedral crystal form. The amount of the precipitated calcium carbonate is at least 5 dry w-% calculated of the total amount of inorganic fillers in the printing paper product.