Printing ink in corrugated box printability and application problems analysis two

Second, other factors that affect the ink printing

Each link in the printing process is related to each other. Under the condition that the control of ink and ink itself is normal, there may be other factors affecting the ink and ink and various printing quality problems may arise. Here are some of the more important factors that have affected ink and wash.

1, substrates (cardboard)

n Absorption of paperboard is poor, and it is easy to cause poor printing ink layer drying;

n The water resistance of paperboard is too strong, which may cause bad ink transfer.

n The surface roughness of the paperboard is not good, it is easy to make the ink color leveling bad, leaking white, poor overprinting, network expansion, graphics around the hair, poor color gloss and other phenomena;

n The difference between the surface color and the pH of the paperboard will make the printed colors different.
Printing plate

n The number of plate lines and the number of anilox rollers are the main factors that determine the amount of ink loaded and the precision of the printed matter. The combination of the two is unfavorable and will cause different ink supply volumes, making it difficult for prints to achieve the desired results.

n The poor printing plate material is prone to print graphic artefacts, the printing pattern is not clear around the problem, and even worse, the plate is susceptible to aging, deformation and loss of print recovery.

n The bad design of the printing plate pattern will make the printing of multi-color overprinting, the overall graphic layering sense is insufficient, the overprinting is unclear, and the stacking color is poor.

2, anilox roller

The mesh number of the anilox roller and whether or not it has a scraper largely determine the ink loading and precision of the ink. If the usage time of the anilox roller is too long or the maintenance and cleaning are not clean, it is easy to cause clogging of the mesh, scratches on the surface, wear and the like. The resulting color inconsistencies in the print, the printed article has articles or can not reach the expected ink layer and color intensity and other issues.

3, printing speed

Different printing speeds also have a certain influence on printed products. Mainly in the easy dirty version, overprinting is not allowed, the printing of dry goods affected by the color and the depth of the problem. The speed of the machine differs from the requirements for the printability of the ink.

n When the speed is faster, the viscosity of the ink needs to be lower and the drying is faster;

n When the speed is slow, the viscosity of the ink is required to be slightly higher and the drying is slower.

3, printing pressure

The adjustment of printing pressure is very important.

n When the pressure is too high, the printed graphic will be deformed due to pressure, which will easily cause dirty plate stencils, causing problems such as burrs and ghosting around the prints;

n When the pressure is too small, it is easy to print falsely, and the pattern is missing or not inked.

4, weather changes (temperature and humidity)

The temperature is most sensitive to the viscosity of the ink and the drying speed.

n When the temperature is too high, the moisture of the ink in the printing process evaporates too quickly, the ink dries quickly, and the viscosity of the ink rises significantly;

n When the temperature is low, the moisture of the ink in the printing process evaporates slowly and is slow to dry.

Humidity also has a great influence on the drying speed of the ink, which is mainly reflected in the drying time of the print.

The effect of temperature and humidity on the ink will also cause print quality problems. The optimum temperature and humidity for ink printing is best controlled between 15°C and 5°C (relative humidity 60%--80%). At the same time, the operating personnel should make appropriate adjustments to the printability of ink and wash according to changes in temperature and changes in the temperature and humidity of the actual printing shop.

In summary, during the production process, the printing plant should combine its own equipment conditions and other ink printing and other printing factors to fully understand each other and match each other to achieve the best printing quality. (to be continued)