Rheology drying tests

Quality Control and Testing. Control of inks is done by examining their color strength, hue, tack, rheology, drying rate, stabiHty, and product resistance. Elaborate control equipment and laboratory testing procedures are employed to test the finished inks. Weather-Ometers,... 

It has been shown recently that CMC adsorbs on cellulosic fibres improving the stabilization of their dispersion in an aqueous medium. This phenomenon was studied by electrokinetic measurements and rheology [36], and it was also demonstrated that these modified fibres can be dried and redispersed easily in a reversible way. Some of these results are given in Fig. 24.4 and show that the role of these additives is nearly independent of the CMC characteristics. Among different additives tested in this context, CMC were found as the most efficient. 

Preparation of the sample may involve drying the sample moisture absorbed from the air can cause some polymers (e.g., polyesters and polycarbonates) to degrade chemically when melted. These samples must be dried in a heated convection oven or vacuum oven to drive off moisture before testing. Since the presence of moisture dramatically affects the rheological properties of the material, it is very important that the drying protocol be followed consistently to ensure repeatable test results. 

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