Paper is divided into high gloss, semi-gloss and matt according to surface gloss. "Poor drying performance, slower drying speed" is a common problem in matt paper printing process. Why does the ink drop phenomenon occur when the fountain solution, paper PH, ink layer thickness, environment, and ink are all normal?
Relevant professionals believe that the main reason for the poor drying of matt paper blots is reflected in the following two aspects
1. Particularity of matt paper itself 2. Particularity of black ink pigment.
Due to the low sizing degree, matt paper has a loose structure and rough surface, which makes it highly absorbent and the binder in the ink can be quickly absorbed. The pigments of yellow, magenta, and cyan inks are generally made of inorganic or organic pigments, while black inks use carbon black (elemental carbon) as the pigment. Carbon black has no drying effect. Generally, black ink is better than other color inks. Dry slowly. In addition, the adhesion between carbon black and the binder is lower than other inorganic or organic pigments, which causes the matte paper to absorb the binder in the ink too quickly, so that the carbon black floats on the surface of the paper.
The use of matt paper is becoming more and more widespread, and some printing companies use post-print varnish to alleviate this problem. This not only increases the cost and lengthens the production cycle, but also the biggest hazard is to change the original characteristics of matt paper, and the color is also affected.
In order to meet the customer's requirements for the black ink solid color on matt paper and solve the problem of "dropping ink", some people have made some attempts. One is to use yellow, magenta, and cyan inks for the screen version. Black; the second is to use the toning method to mix black, magenta, and cyan ink in equal amounts to obtain black ink to avoid the "carbon black" in the black ink. Because the pigments in yellow, magenta, and cyan inks are basically inorganic pigments, their drying properties and adhesion are significantly better than carbon black.
The ink drop phenomenon is more prominent especially when printing solid black ink, which has an impact on product quality and production cycle.
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