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US 2011/0214825 A1Published application
Method for manufacturing mechanical pulp and use of the mechanical pulp
AssigneeITT Manufacturing Enterprises, Inc.
InventorsErnst-Martin Billing, Esko Härkönen, Heli Viik, Jean-Cristophe Hostachy, Serge Kocimski
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Abstract
A method for treating mechanical pulp. Resinous mechanical pulp is brought into process in a process water flow. The resinous pulp is ozonated at a temperature between 80 and 87° C. and at pH less than 4. The pH of the pulp is adjusted after the ozonation process to correspond to the pH required in bleaching. The pulp is bleached.
Claims13
A method for treating mechanical pulp, the method comprising:
- bringing resinous mechanical pulp into a process in a process water flow,
- ozonating the resinous pulp at a temperature which is between 80 and 87° C., and at pH which is less than 4,
- adjusting the pH of the pulp after the ozonation process to correspond to a pH required in bleaching, and
- bleaching the pulp.
1 more element
Dependencies are inferred from the claim text.