He described the flow behaviours of fluids with a linear relationship between shear stress and shear rate. Newtonian fluids get their name from Sir Issac Newton. In printing, ink viscosity has huge effects on the print quality.The amount of product dispensed in a process whether automated or manual is affected by its rheological properties.The viscosity of the fluid is critical where it’s pumped through a pipeline or dosing system if the viscosity is too high, the pump won’t be able to cope.Conversely, if it's too thick they won’t use enough and it will also be very hard to get it out of the bottle. Is the product going to have the same look and feel my customer is expecting? For example, if a shower gel is too thin then when the customer tries to apply it, it will dissipate and they will have to use more product to be able to wash.The rheological properties of a fluid are important for many reasons. Viscosity is a widely measured property and is critical in a wide range of industries and products.
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