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1. The temperature change ink is different
If the flow rate of each layer of the ink is different due to some external reasons, there is a force and reaction force between the liquid layers with different flow speeds at the two contact surfaces. This force is called the internal friction force of the ink. The property is called the viscosity of the ink. The physical measure of ink stickiness is called viscosity.
2. The difference in the expression of temperature change ink
Viscosity occurs when resisting separation of the ink film, and the fluid exhibits tack only when it flows, and does not exhibit tackiness in the stationary fluid. The effect of viscosity is to block the relative sliding of the fluid inside, thus blocking the flow of fluid, but this retardation can only delay the relative sliding process and cannot stop it. This is an important characteristic of fluid viscosity, and it is a rheological parameter that indicates the internal adhesive properties of the fluid. Viscosity is a measure of the internal friction generated between molecules as the fluid moves by external forces. Viscosity is a property of a fluid that always exists whether the fluid is stationary or flowing.
3. Temperature change ink detection method, unit is different
Tack is measured with a rotary viscometer. The stickiness meter is used to measure the resistance generated by the separation of the ink or web layer and expressed numerically as the stickiness value. There is no unit for stickiness.
There are several ways to measure the viscosity. In general, there are capillary viscometers, small-pore viscometers, rotary viscometers, and rotary cone-plate viscometers. In general, a rotating viscometer is used to measure the viscosity of the ink. When the rotor is subjected to viscous drag of the liquid, the balance spring generates torque, which counteracts the viscous resistance, and finally reaches equilibrium. At this time, the pointer connected to the hairspring indicates a certain reading on the dial (ie, the twist angle of the hairspring). Multiply the reading by a specific factor to get the viscosity of the liquid. This shows that the viscosity and viscosity are different in units.
4. Different influence factors
The factors that affect the viscosity are: elastic roller diameter, hardness and elastic modulus, roller properties, roller speed, roller temperature, ambient temperature and humidity, sample temperature, ink film thickness, ink or binder, etc. for the elastic roller Impact, the status of the elastic roller in the cleaning process, the nature of the tested sample, etc.
The factors affecting viscosity are: viscosity is closely related to its temperature, component particle concentration, particle size, etc., and has little relationship with humidity and pressure. The measurement accuracy and unit of measurement of different measurement methods are different and cannot be mutually converted.
From the above four points we can see that ink printing viscosity and viscosity are very different, but the two are still linked. Viscosity is the physical quantity that measures the viscosity of a fluid. The dynamic viscosity of a fluid is determined by the inherent physical properties of the fluid. The value is a direct measure of the viscosity of the fluid, and it is also the resistance of the fluid to shear deformation during movement. A measure of ability. Under the same environmental conditions, high viscosity means high viscosity, and vice versa.
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Variable temperature inks control the viscosity in gravure
In plastic gravure printing, how to control the ink printing viscosity is a very critical issue. Especially in high-speed rotogravure printing, whether the temperature-change ink ink printing viscosity is properly controlled is directly related to the vast majority of quality issues such as the transfer of pigments, dirty prints, brightness of printed gloss, fastness of pigment bonding, and static electricity. Affect the print product yield and work efficiency. So, in the plastic gravure, how to control the ink printing viscosity, in order to take into account many aspects, to ensure the quality of printed products. This requires us to first understand the two concepts of ink printing viscosity and viscosity. According to the investigation of relevant textbooks or materials, the overview of the relationship between the two is usually very ambiguous, and some even see the two as a concept. In fact, there are obvious differences between the two. The following summarizes several points to illustrate the ink printing viscosity. The difference and connection with stickiness.
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