Reflocculation and drainage abilities of dual component retention systems, which consisted of coagulant and flocculant, were studied with the Photometric Dispersion Analyzer (PDA) and the Dynamic Drainage Analyzer (DDA). The dual component retention system was found to be superior to single polymer systems in both abilities. It was postulated that the coagulant blocked the adsorption site of the flocculant on the fiber surface and prevented the reconformation of the flocculant chains onto the fiber surface under the high shear turbulence. The shorter addition interval between coagulant and flocculant gave the higher the effectiveness of the dual component retention system. In addition the dual component retention system improved the paper properties. The sheet permeability increased with a decrease of drainage time.
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