Abstract
Effectiveness of polymeric retention aids in a dynamic sheet-forming process has been analyzed with regard to their physical properties. A significant improvement of one-pass retention of filler and fiber particles under intense shearing conditions, which the majority of commercially available retention aids fail to achieve due to collapse of bondings once formed by coagulation and flocculation, is obtained only with a giant polymer of high molecular weight. Higher level of spacial extension of molecular configuration explains higher bridging efficiency which results in formation of more tenacious and dense flocs resistant to hydrodynamic forces of turbulence. Ionic type and ionic strength of a polymer are supplementary factors in controlling the colloidal attraction forces between solid surfaces and the degree of repulsive stretch of the polymer molecules.
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