What factors affect the quality of water-like ink printing?

Due to the overall protection of the environment and resource conservation, water-based ink with its unique environmental performance by the industry and outside the wide attention, has become the current ink industry development of the main direction. So, what are the factors that influence the quality of water-like ink printing?
Ink gloss
ink gloss, mainly refers to the ink imprint at a certain angle of the formation of light emission capacity, the ink gloss affects the main factors are linked materials after drying the conjunctivity.
ink gloss, directly affect the quality of printing materials

. Therefore, when the gloss of the ink itself can not meet the demand, people tend to take the printing on the cover, plastic, coating or applying gloss to enhance the gloss.
, gloss is increased, but the printing process is bound to increase, printing expenses also increased. Therefore, if the gloss of the ink itself can meet the requirements, it must be both time-saving and money-saving, two things at once.
the viscosity of the ink interface
the viscosity of the ink is directly related to the transferability of the ink and the suitability of the brush, and when printing with the same items, different factors are formed. At the same time, the ink in the printing process, the different viscosity will also lead to different changes in surface pressure, so as to directly shadow the effect of the ink after printing.
for water-like inks, it is necessary for people to be able to take measures on the level, dot expansion rate and color intensity of printed images. If the ink interface is relatively low viscosity, before the ink appears dry, it will produce a corresponding expansion, resulting in uneven overall ink spread effect, resulting in a decrease in ink gloss.
if the dot does not expand, it will cause the corresponding damage to the balance of the ink itself, so that the color distortion. And the ink viscosity is higher than the relevant standards, it will have a certain impact on the transfer of ink, and will also lead to printing after forming, paste, dirty version and other quality problems.
Therefore, for the control of ink viscosity, to be developed for the relevant national standards, in general, the viscosity control at about 20", the general ink viscosity control at 50"-65"/25 degrees C, for high-grade ink, viscosity control at 25"-35"/25 degrees C.
fineness analysis
fineness refers to the size of the ink particles and the degree of uniformity of the formation of dispersion, but also an important criterion for the evaluation of ink slurry, will have a certain impact on the quality of printing.
In the production process of color paste, in addition to the fineness of the ink through decomposition machine, lubricant, etc. to adjust, when necessary, also need to use three rollers and other pigments mixed in the color paste for grinding, so that the details of the printed material to maximize the requirements.
for their own fineness is relatively good ink, the concentration performance is good, but also has a good coloring rate, such ink after printing, the quality of the finished product will be relatively high. Conversely, if the fineness is relatively large, it will hinder the printing work, so that the edges of the printed pattern hair, emptiness, and even cause paste.
, for ink fineness, but also to be able to make it in a certain standard, and in accordance with the relevant standards, so that it can avoid pigment reunion and other issues.
pH
water-based ink is mainly presented with weak alkaline, mainly because the acrylic resin in the ink will show acidity, and itself has insoluble properties in water, and after adding ammonia substances to the ink, there will be a certain chemical reaction with water, resulting in pH increased, showing a weak alkaline.
At the same time, the size of the pH value on the stability of ink and dryness has a great impact, if the PH value is too large, it means that ink alkaline, alkaline resin dissolved relatively much, it also reduces the adhesion of the ink itself, in printing will appear some bubbles, the printing quality has a certain impact.
If the pH is too low, indicating that the ink alkaline is relatively weak, ink in part of the alkaline resin can not dissolve, so that ink viscosity is enhanced, drying speed will be accelerated, printing congestion and other issues, so in ink pH control, should be stable between 8-9, so that it can ensure that the printing quality in a high-quality state, to meet the needs of people in print.
water-based inks in different pH conditions of color effect and color stability, and in different pH values of the paper to sample and analyze its printing effect. Through the study of the solid content, viscosity, pH and other basic properties of water-based ink and the color density and color difference of spiculation, it is found that the solid content, surface pressure and viscosity value of
water-based ink pH range between 8.2-9.5. The results of the testing on the surfaces of advanced copy paper and corrugated paper showed that the color density value of ink on both sets of paper surfaces was stable and less volatile, and the color density value of advanced copy paper was greater than that of corrugated paper.