Method and apparatus for treatment of fiber suspension containing minerals, such as coated broke, in paper production
AssigneeAndritz Inc.
InventorPentti Vikiö
Life of this patent
Estimating the term…
Abstract
A method and apparatus treat fiber based material so as to reduce the loss of mineral fractions in the treatment of broke in paper production. Broke is a reusable raw material from a paper machine that contains mineral fractions which are desirably returned to the process as a raw material. The material containing minerals is dispersed into broke pulp, which is fractionated, and the accepts from the fractionation are returned to the paper manufacturing process providing for efficient and economical recovery of the minerals in broke. The mineral fraction provided in the rejects from the fractionation is treated separately before it is reused as filler or coating material in the production of paper or board.
Claims24
A method of treating fiber based material containing minerals, during the manufacture of paper or board using a paper machine, comprising:
- (a) supplying fiber-based raw materials for paper or board manufacture to a paper machine;
- (b) collecting at least one of broke from paper manufacture and recyclable pulp to provide a fiber material containing minerals, and dispersing the fiber material to form a pulped fiber material;
- (c) treating the pulped fiber material from (b), before the pulped fiber material is mixed with the paper or board manufacture fiber-based raw materials being supplied to the paper machine according to step (a), to disintegrate non-dispersed fractions therein to produce treated fiber material;
- and
- (d) mixing the treated fiber material obtained from step (c) with the paper or board manufacture fiber-based raw materials being fed to the paper machine according to step (a).
Apparatus for treatment of fiber material containing minerals, comprising:
- (i) a paper machine for producing paper or board;
- (ii) means for collecting at least one of coated broke from paper manufacture, uncoated broke from paper manufacture, and recycled pulp;
- (iii) means for mixing material collected by said collecting means into a flow of raw material to said paper machine;
- (iv) means for dispersing the material collected by said collecting means into fiber pulp;
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- (v) between said dispersing means and said mixing means, means for disintegrating non-dispersed fractions of the fiber material so as to produce a treated fiber material in which non-dispersed fractions therein are disintegrated before being mixed with the raw material in said mixing means.
Dependencies are inferred from the claim text.