The curling reason of the cigarette pack print and its solution

In gravure or flexo printing, sometimes the paper curls to the front, making the appearance of the product uneven, and seriously affecting the customer's use.

The reason for this phenomenon is that hot air helps in drying during gravure or flexo printing. When printing is complete, the moisture content of the paper itself is less than the white material before printing. In addition to printed matter, printing inks and glazing are generally required. In this way, the front side of the printed matter has the protection of the ink layer and the lacquer layer, and plays a role of separation during the contact with the air, so that the extension may be very small. On the other hand, because there is no protective layer on the reverse side, the paper is certainly affected by the humidity of the air, and because the surface sizing paper itself is deformed by different humidity, the negative side is larger than the front side, and the product is curled upward. The product of the gravure or flexographic ink layer and the varnish layer is placed on a cup having a certain water temperature, and the water vapor is applied upward to make the paper face wet. We can see that the ink layer and the lacquer layer receive dampness toward the cup opening, and the product is almost not deformed; however, if the back surface is toward the cup, the product is deformed immediately and curls toward the front surface.

After knowing the reason, countermeasures can be taken: strictly control the temperature and humidity of the printing shop, apply a minimum amount of material on the back of the paper, and make it play a protective role in contact with the air. Such as: Arab gum 3% ~ 5%, this phenomenon is basically resolved.

Source: China Tobacco Packaging Ink Information Network

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