BLEACHING OF MECHANICAL PULP WITH HIGH-TEMPERATURE PEROXIDE

PROBLEM TO BE SOLVED: To raise the whiteness level of mechanical pulp by bleaching it with hydrogen peroxide. SOLUTION: A method for producing bleached mechanical pulp, which involves using a pulping mill incorporated with a primary refiner and a secondary refiner, comprises the 1st step of feeding...

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Bibliographische Detailangaben
Hauptverfasser:	CAMPBELL ROGER O, HAMILTON ROBERT T, PARRISH ANTHONY, HAYNES KAAREN K, BROOKS ZEECHA L
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TEXTILES TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKINGMACHINE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To raise the whiteness level of mechanical pulp by bleaching it with hydrogen peroxide. SOLUTION: A method for producing bleached mechanical pulp, which involves using a pulping mill incorporated with a primary refiner and a secondary refiner, comprises the 1st step of feeding a cellulosic material (e.g. wood chips) and refining it into pulp, wherein the wood chips have an initial whiteness level, the 2nd step of feeding the refining system of the pulping mill with a bleaching liquid, wherein the bleaching liquid includes a certain amount of an alkali including >0 wt.% but