Curling causes and solutions of the hottest cigare

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Reasons and solutions for the curling of cigarette package printed matter

in gravure or flexographic printing, sometimes the paper curls towards the front, which makes the appearance of the product uneven and seriously affects the use of customers. You can find a drink bottle

the reason for this phenomenon is that there is hot air in the gravure or flexo printing process to help dry. When printing is finished, the water content of the paper itself is less than that of the white material before printing. Plus printed matter, printing ink and glazing are generally required. In this way, the front of the printed matter is protected by an ink layer and a light oil layer, which plays a separation role in the process of contact with the air, and the possibility of extension is very small. Because there is no protective layer on the reverse side, the paper will definitely lengthen under the influence of air humidity, and because there is surface sizing, the paper itself will be deformed by different humidity, that is, the reverse side is larger than the front side, which will cause the product to curl up. A good solution is to put the products polished on the ink layer and gloss layer of gravure or flexo on a cup with constant water temperature in two stages, and the water vapor will damp the paper surface upward. We can see that the ink layer and gloss layer face the cup mouth and receive moisture. With the continuous deepening of the use of aluminum alloy in the field of automotive lightweight, there is almost no deformation of first-class service products; However, if the back faces the mouth of the cup, the product will immediately deform and curl towards the front

after knowing the reason, countermeasures can be taken: strictly control the temperature and humidity of the printing workshop, and coat the back of the paper with a minimum amount of substance to make it play a protective role in contact with the air. For example, Arabic gum 3% - 5%, this phenomenon is basically solved

source: information of Chinese cigarette packet ink

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