Читать книгу The Rheology Handbook - Thomas Mezger - Страница 80

After a certain shear-thinning range, highly concentrated preparations of paper coatings (suspensions showing a pigment content of about 70 weight-%) may display shear-thickening behavior beginning at around γ ̇ = 1000 s-1, often followed by a dilatancy peak. The peak was found to be shifted towards higher shear rate values for coatings showing a lower pigment concentration. Shear-thickening may cause problems during a coating process leading to coating streaks including the danger of tearing the paper [3.23].