IN VIEW OF THE elevated demand for the use of recycled materials from the paper mills, the recycling frequency of the recycled fiber has been greatly increased, resulting in reduced wastepaper quality and increased fiber fines in the process. Coupled with the limitation of fresh water consumption, the papermaking systems of most paper mills have become closed and more complicated. One of the problems encountered is an increase in the accumulation of water soluble colloidal substanc- es in the white water that results in lower sheet drainage, high web moisture in the wire and press section as well as increased steam consumption in the dryer section, which ultimately affects the machine runnability, productivity and paper quality.
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