Some aspects of retention aids

Abstract

Fundamental aspects on polymer adsorption and flocculation phenomena are reviewed. Special emphasis is placed on recent developments. Examples are the mode of action of microparticle retention aid systems and of retention systems based on polyethylene oxide/phenolic resin. Fibre flocculation and the strength of fibrous networks are affected by retention aids and this is discussed in connection with investigations on retention and formation in the laboratory and on pilot-scale paper machines.