ScherZeit - Analysing the effect of shear and retention time on the dosage of retention aids under industry oriented conditions

The retention aids used in the paper industry are in large part cationic polymers of high molecular weight. Their effect depends to a large extent on induced shear after dosage. The emerging flocs and even the polymer itself can be destroyed by the induced shear. To evaluate this effect of shear and also of retention time an already available prototype for simultaneous industrially relevant measurement of formation, retention and dewatering shall be equipped with a shear reactor capable of inducing variable and defined shear in the industrial scale on the suspension in the approach flow.