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Freeness improvement of recycled fibers using enzymes with refining


, : Freeness improvement of recycled fibers using enzymes with refining. Enzyme applications in fiber processing 4

As recycled fiber use and content has increased in paper and board manufacture, the need to improve the drainage rate on the paper machine while maintaining mechanical properties through refining has become more important. This work is focused on the application of an enzyme (Pergalase A40) to blended colored ledger (BCL), varying the level of refining, point of addition of the enzyme, and enzyme dose for application in the manufacture of board from 100% recycled fiber. These results will be compared with those for flexographic newsprint (ONP) and old corrugated container (OCC) fiber types. The objective of the study is to determine the conditions which give the best drainage improvement while maintaining strength properties. The use of enzymes to improve the production of paper and board from recycled fibers is discussed and the most important properties of each fiber type are compared.

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