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Polyethylene oxide induced fines flocculation and retention: From bench top experiments to paper machine performance by Meng Ran Wu; Theo G.M. van de Ven is a Engineering article available to read on EtoBox.

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High molecular weight polyethylene oxide (PEO) is used in combination with a cofactor as an effective retention aid system, especially for mechanical grade papers. The performance of PEO depends on the shear history to which PEO has been subjected prior to injection into a paper machine. A series of investigations which show that freshly dissolved PEO is more efficient than well-dissolved PEO is reviewed. This was concluded from a broad spectrum of experiments: (i) laboratory bench-top flocculation experiments on clay particles and pulp fines; (ii) fines retention experiments on a laboratory twin-wire sheet former; (iii) retention experiments performed on a pilot Fourdrinier paper machine and (vi) measurements on an industrial twin-wire paper machine. The differences between freshly and well-dissolved PEO are ascribed to the state of PEO molecular aggregates: freshly-dissolved PEO is present as entanglements, which are effective bridging structures, while well-dissolved PEO is completely disentangled, in which form its efficiency is reduced. The results show that the behavior of PEO observed in bench top experiments can be extrapolated to the behavior on industrial paper machines.

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Author

Meng Ran Wu; Theo G.M. van de Ven

Publisher

Walter de Gruyter GmbH

Published

2006

Language

EN

Field

Engineering (Physical Sciences)