How do waxes affect system viscosity in offset inks? In high-speed rotogravure printing, whether the ink viscosity is properly controlled is closely related to most of the quality problems, such as the transfer of pigments, dirty plates, printed product gloss, ink layer firmness, static electricity, etc., and affects the finished product of the printed product. rate and production efficiency.
1. Ink printing viscosity affects pigment transfer effect
In the printing process, the quality of the pigment transfer effect is mainly related to the printing viscosity of the ink. The higher the ink printing viscosity, the less effective the pigment transfer will be. When the ink printing viscosity is too high, the entire ink system is in a saturated state, and the fluidity of pigments and other substances is poor, and they cannot be dispersed uniformly. Not to mention transfer, this is the so-called blocked version.
2. The viscosity of ink printing is easy to cause dirty plate failure
The eradication of the blocking phenomenon is not only related to the hardness of the squeegee, the pressure of the squeegee, the contact angle of the squeegee, and the quality of the plate cylinder, but also the printing viscosity of the ink. When the ink printing viscosity is too high, the fluidity of pigments and other substances is poor, and they cannot be dispersed evenly, and they are easy to accumulate together.
3. The viscosity of ink printing affects the gloss of the printed product and the fastness of the ink layer
Pigment bonding firmness is also related to ink printing viscosity. The ratio of resin and pigment in the ink component should not be too large or too small, but should be within the normal range to ensure that the pigment is firmly bonded.
4. The viscosity of ink printing is easy to cause static electricity
As the ink printing viscosity decreases, electrostatic phenomena such as whiskers, dark ink, poor transfer, and extremely irregular water spots of pigments will occur.
Adding 1%~3% polyene wax to the ink can change the fluidity of the ink, reduce the viscosity of the system, and at the same time improve the smoothness, abrasion resistance and scratch resistance of the ink. Improve freshness, speed up fixation, and make printed dots complete. It can reduce the disadvantages such as caking, scratching, and rubbing; improve the printing performance of the ink. Tianshi wax powder recommends that you add polyene wax into the ink, which can be dispersed with organic solvent, emulsified with water, and made into micropowder with suitable particle size.
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