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1. There are too many paper powders on the surface of the linerboard paper to make the ink adhere poorly.
2. Adhesiveness of the ink itself is not enough, or the water is diluted too much, so that the resin component in the ink cannot cover the pigment particles to expose the color particles, and easy to discolor.
3. After the ink is dry, the water resistance is not enough, and the ink film is reconstituted with water.
4. The ink film surface is not smooth enough.
5. Some black ink fades due to carbon black's inability to be coated.
In order to prevent discoloration, cartons are often covered with a layer of moisture-proof oil (or varnish) on the surface of the carton or the re-patterned portion to prevent the ink from discoloring and increase the brightness of the pattern. Full-page moisture-proof cover used in the past commonly used offset printing machine (roller coating machine) printing moistureproof oil. Others use brush patterns to brush a layer of emulsified lipids. The varnish made of rosin resin (malino resin) or acrylic resin is also used to cover moisture. At the same time, it also increases the strength of the carton.
How to detect the wear resistance is currently only the corporate standards of enterprises, oil friction meter and manual operation points, the same principle, that is, a piece of white paper or white cloth on the ink film, under a certain pressure, back and forth friction 20, view the color change The situation is judged by eyes in five levels. (Mr. Zhang Dingshan, Chairman of Jinan Modern Ink Company)
Due to differences in the use of professional languages, the understanding may also be one-sided. I think the problem raised is that the ink on the carton has insufficient abrasion resistance, it can be faded by hand, and it may get caught in the clothes when it is moved. For this purpose, a layer of varnish is printed on the ink to increase the abrasion resistance. If this is the meaning, I consider the following reasons: