![]() This degree of change could be used as a control parameter in QC testing to determine whether the mix has reached its end condition prior to freezing. Most formulations will show some decrease in viscosity which is referred to as “pseudoplastic” or “shear thinning” behavior.Īs mentioned earlier, “thicker” formulations may exhibit greater change in viscosity. temperature profile, and possibly yield stress determination. The most basic test involves rotating the spindle at increasing speed to observe how viscosity changes. ![]() Typical tests in R&D will include viscosity flow curve, viscosity vs. Mix material inside the circumference of vane shears against material outside, providing a true viscosity measurement of the formulation loaded with particles. ![]() The vane spindle can rotate in a beaker for a quick quality control (QC) test or mating chamber for characterization of flow behavior by R&D. ![]() Vanes allow plenty of space for the pieces to migrate freely as the spindle rotates. What happens when you add fruit pieces to the mix?Īddition of fruit pieces and other particulate items to the mix has led to use of vane spindle to measure viscosity of new formulations. ![]()
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