How do you measure ink viscosity?
Vibrational Viscometer. Zhan cup is a cup-type viscosimeter that measures the viscosity of the ink by flowing a definite volume of ink through the cup. The time (seconds) required for the ink to flow through the cup defines the viscosity of the ink.
What is viscosity of ink?
The property of a fluid, such as a printing ink, that describes the degree of its resistance to flow, or its ability to adhere to a surface. In ink terminology, viscosity refers to the extent to which ink will resist flowing. …
What do you mean by viscosity and tack of ink?
The process is retarded with growing viscosity due to fluid loss and viscous structure rebuild, through oil removal from the ink by substrate absorption. The latter results in a decreasing mobility of the ink layer and the overall phenomenological effects are known as the tack build-up of the ink layer.
How do you increase the viscosity of ink?
for increase viscosity – increase Dye/pigment % in ink for solvent and water based ink. For water based ink – increase dye/pigment % or glycerol %.
What is low viscosity ink?
Posted on April 21, 2016 by Zebra Pen. Viscosity is a measure of a liquid’s ability to resist flow. A thick liquid that does not flow easily has high-viscosity; a thin liquid that readily flows has low-viscosity. The impact of a low viscosity ink is writing smoothness.
What is tack in ink?
“Ink tack” can be defined as the “stickiness of an ink” similar to what you would feel if you try to pull your fingers apart with ink between them. This “adhesive ink cling” is important to its transfer. The ink cohesive strength and tack are due to similar forces.
How can you reduce the viscosity of ink?
Fluctuations in temperature can have a drastic impact on the viscosity of ink. For example, a temperature increase of 5.5°C can reduce the viscosity of a printing ink by 50 percent or more (DeJidas and Destree, 2005).
What type of printing uses ink viscosity?
Flexographic printing is done on paper, cardboard, or plastic film. Liquid inks with a low viscosity are used for printing. There are water-based inks, solvent, and ultraviolet (UV)-cured inks among them.
What is an example of high viscosity?
Liquids which flow very slowly, like glycerin or honey, have high viscosities. Those like ether or gasoline which flow very readily have low viscosities.