Using inline retention control and drainage analysis to stabilize white water consistency and drainage, achieve higher machine speeds and increases in both production levels and profits.
Problem Description The board converter demanded 10% lower basis weights from the mill. To keep production of the 100,000 tpy of the two-ply-machine at least constant the machine speed had to be increased accordingly. A microparticle retention system was introduced to improve drainage and as a result increase machine speed. Drainage is especially critical at the top wire. Trials to maintain the demanded higher machine speed by manually controlling the retention aid failed.
Installation A RET-20 Analyzer was installed at the common white water. The bottom ply headbox was equipped with a RET-20 Inline Retention Control and the top ply headbox with a DRA-5000 Drainage Analyzer.