Linear-rate rheological behavior.

The viscosity value remains constant despite the variation in shear stress or velocity gradient.

Oil and water are the most significant examples of this behavior: these fluids never change their viscosity value whether they are quickly or slowly stirred.

In Ceramics, the Newtonian behavior is well represented by digital inks that must be Newtonian in order to be correctly applied by the digital print heads.

If the ink’s rheological behavior was plastic or pseudo-plastic (the viscosity value changes according to the speed of movement of the system), the piezoelectric impulse system (that develops the ink drop) would not be effective, leading to a lower printing definition or, at worst, preventing the formation of the ink-drop. Print heads basically would not be able to spray and discharge the ink on the raw ceramic support.