A modern stock preparation system strives toward good end product quality, improved papermaking line runnability and efficiency, both in terms of production and energy.
Wet end chemistry strongly influences the production efficiency and profitability of paper and board making, and thus represents a considerable part of operating costs. Stability forms the basis for quality and runnability while flexibility contributes the most to efficiency. The best solution cannot only be found through sub-process optimization but through sufficiently broad process integration.
The majority of stock preparation and approach systems are still based on conventional technology where large volumes, log delays and instability problems prevail. But these systems have some major drawbacks, such as the uncontrollability of separate dead volumes in tanks. Immediate problems with these systems include instability, such as consistency variations, stock and filler proportioning and the extended time required for grade changes.
OptiFeed is a streamlined, single platform concept where automation and process design complement each other. The idea is to make stock processing stable and flexible, thus enabling improved production line quality and efficiency compared to conventional wet end management systems. Well engineered components and optimally dimensioned process-not too big, not too small-saves energy and prevents consistency deviations as well as pulsation. The OptiFeed system integrates separate key elements of the mill area in a unified high-efficiency concept, applicable to the entire stock preparation system or to approach flow system alone or components within it.
This paper will present the implementation and benefits of the OptiFeed system in approach flow system management. The focus will be on deaeration and mixing processes, and automation solutions.
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