Variable temperature ink gravure viscous control

It is understood that in plastic gravure printing, how to control ink printing viscosity is a very critical issue. Especially in high-speed rotogravure printing, whether the temperature-changing ink ink printing viscosity control is appropriate is directly related to most quality problems such as pigment transfer, dirty plate, print gloss brightness, pigment adhesion fastness, static electricity, etc. Affect the yield of printed products and work efficiency. Then, in the plastic gravure printing, how to control the ink printing viscosity, in order to balance the various aspects, to ensure the quality of the printed product. This requires us to first understand the two concepts of ink printing viscosity and viscosity. According to the relevant textbooks or materials, the relationship between the two is usually vague, and some even regard the two as a concept. In fact, there is a clear difference between the two. The difference and connection with stickiness.

1. The definition of temperature change ink is different. If the flow velocity of each layer of the ink is different due to some external reasons, especially between the liquid layers with different flow speeds of the two contact surfaces, there is a force and a reaction force, and the force is called the inside of the ink. Friction, the property it exhibits is called the viscosity of the ink. The physical quantity that measures the viscosity of an ink is called viscosity.

2. Temperature-changing inks The difference in viscosity is that it occurs when resisting the separation of the ink film, and the fluid exhibits viscosity only when flowing, and does not exhibit viscosity in the static fluid. The effect of viscosity is to block the relative sliding inside the fluid, thereby blocking the flow of the fluid, but this retardation can only delay the process of relative sliding and cannot stop it. This is an important property of fluid viscosity, and it is a rheological parameter that indicates the internal adhesive properties of the fluid. The viscosity is a measure of the internal friction generated between molecules when the liquid is moved by an external force. Viscosity is a property of fluids that always exist regardless of whether the fluid is at rest or flowing.

3. Temperature change ink detection method, unit different viscosity is measured by a rotary viscous meter. The amount of resistance generated by the separation of the ink or the film layer is measured by a viscous meter, which is numerically expressed as a viscosity value. Sticky has no unit.

There are many ways to measure viscosity. There are generally capillary viscometers, small-bore viscometers, rotary viscometers, and rotating cone and plate viscometers. In general, a rotary viscometer is commonly used to measure the viscosity of an ink. When the rotor is subjected to the viscous drag of the liquid, the balance spring generates torque, competes with the viscous resistance, and finally reaches equilibrium, when the pointer connected to the balance spring indicates a certain reading on the scale disc (ie, the torsion angle of the balance spring). The viscosity of the liquid is obtained by multiplying the reading by a specific factor. It can be seen that the viscosity and viscosity differ in units.

4. Influencing factors Different factors affecting viscosity include: diameter of elastic roller, hardness and modulus of elasticity, properties of roller, rotation speed of roller, temperature of roller, ambient temperature and humidity, sample temperature, ink film thickness, ink or binder The influence on the elastic roller, the condition of the elastic roller during the cleaning process, the nature of the sample to be tested, and the like.

The factors affecting viscosity are: viscosity is closely related to its temperature, concentration of component particles, 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 converted to each other.

From the above four points, we can see that there is a big difference in ink printing viscosity and viscosity, but there is still a connection between the two. The main performance is that the viscosity is the physical quantity that measures the viscosity of the fluid. The dynamic viscosity of the fluid is determined by the inherent physical properties of the fluid. The value is a direct measure of the viscosity of the fluid. It is also the resistance of the fluid to shear deformation during motion. A measure of strength. Under the same environmental conditions, a large viscosity means that the viscosity is large, and vice versa.

Concerned about surprises

Label: variable temperature ink gravure viscous control

Previous: How to properly clean modern lamps Next: Instructions for installing solenoid valves

358 Anti-Climb Security Fence

358 Anti-Climb Security Fence

358 Anti-Climb Security Fence,Security 358 Fence Panel,358 Anti Climb Mesh Fence,358 Anti Cut Mesh Fence

HeBei Bosen Metal Products Co.,Ltd , https://www.hbbosenfence.com