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Bleaching of dissolving pulp

Valmet provides state-of-the-art concepts for bleaching dissolving pulps. We assist you in achieving higher pulp quality, production efficiency and environmental friendliness.

Chip screening

A screening stage is often necessary to achieve the uniform chip size demanded in different processes. Valmet’s concept for chip screening includes several screening options, all designed for effective removal of oversize and fine fractions from the chip flow.

Compaction Baffle Filter

Characterized by its compact, pressurized design, the CB Filter has offered pulp producers a solution with high washing efficiency, high feed consistencies and operating speeds, and minimal total costs for installation and maintenance.

White liquor oxidation system

The purpose of white liquor oxidation is to improve the Na/S balance of the Kraft process by replacing make-up caustic with internally generated alkali. Valmet offers two well-proven and efficient alternatives, an air-based oxidation system for the production of partially oxidized white liquor for oxygen delignification and an oxygen-based system for the production of fully oxidized white liquor for bleaching and oxygen delignification. Oxidized white liquor can also be applied for many gas scrubbing applications.

High-performance oxygen delignification

Valmet Oxygen Delignification system removes lignin with excellent efficiency. It is the ideal oxygen delignification stage and a great asset for pulp mills. Up to 65-70% of the remaining lignin after cooking is removed. This result remains unchallenged. The secret lies in the carefully optimized conditions.

Refining

Optimal blowline refining, hot stock refining, deshive refining and reject refining are key factors to achieve successful end products. Valmet chooses the refiners that are best suited for each application and customer.

Screening

Valmet’s pulp screening systems are characterized by high capacity, high shive removal efficiency and excellent runability. Screening pulp at the highest consistency possible is the basic idea behind our unique screening concept. This results in a substantial reduction of the amount of water that has to be handled. Less water makes it possible to build more compact machines, which also means lower installation costs and energy savings.

Recycled fiber

Valmet’s recycled fiber technologies offer innovative and cost-effective DIP and OCC solutions, offering efficient impurity removal, high yield, and optimized final pulp quality.