Abstract
The EMCC cooking was introduced to the digester at Chuetsu Pulp & Paper Co., Ltd., Sendai Mill in 1994. The brightness of brown stock pulp was increased and the bleaching chemical was saved as expected. However, since the digester was overloaded, the main extraction load became bigger and the digester operation was not in stable, especially in rainy season when the chip moisture was increased. As a result, it has caused big losses such as the reduction of the pulp production.In September. 2001 the digester was modified to the Lo-SolidsTM cooking. The digester-operation has become stable and the pulp quality has been improved since the Lo-SolidsTM cookig was introduced.The Sendai mill made a Down-Flow trial in Lo-SolidsTM cooking this year. It was confirmed that the digester operation became stable further by the Down-Flow operation.
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