Process for manufacturing a fibre web
AssigneeKemira Oyj
InventorsMarko Kolari, Jaakko Ekman, Anu Jaakkola
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Abstract
The present invention relates to a process for manufacturing a fibre web, such as paper, board, tissue or the like. In the process bleached cellulose-containing fibres are suspended into process water in order to prepare a fibre stock, which comprises residual hydrogen peroxide. The process comprises at least one pulp storage tower through which the fibre stock is transferred before it is formed into a fibrous web and dried. Zinc ions are introduced to the fibre stock or one of its constituents to maintain the amount of residual hydrogen peroxide in the fibre stock at or above a predetermined threshold level after at least one pulp storage tower.
Claims19
A process for manufacturing a fibre web, which process comprises:
- a fibre stock preparation stage, where bleached cellulose-containing fibres are suspended into process water in order to prepare a fibre stock, which comprises an amount of the residual hydrogen peroxide, and
- at least one pulp storage tower through which the fibre stock is transferred before the fibre stock is formed into a fibre web and dried, wherein
- zinc ions are introduced to the fibre stock or one of its constituents to maintain the amount of residual hydrogen peroxide in the fibre stock at or above a predetermined threshold level after at least one pulp storage tower, and the amount of residual hydrogen peroxide is determined at least in one process location between the introduction of the zinc ions and the formation of the fibre web, and the determined amount is used to control the introduction of the zinc ions.
Dependencies are inferred from the claim text.