Methods for preventing dirt and stains in adhesive label printing
Edit： Click： Times Date：2026-2-2
Adhesive stickers are evenly coated with a layer of adhesive on the back of the paper, adhering to a layer of easily peeled wax coated paper. In hot summer days, the temperature is high, and the adhesive liquid under the pressure roller between the rollers will leak out from the gaps of the paper. The trace adhesive liquid of the adhesive sticker will flow out under high temperature and mechanical roller pressure, sticking and connecting, which will directly affect the accurate printing of normal paper feeding. The adhesive liquid at the edge of the paper will stick to the rubber roller, making it easy to stick the adhesive sticker to the roller, ink roller, and impression roller, commonly known as "glue wrapping". This is one of the biggest drawbacks of stickers in printing. In our practical work in offset printing, the solution to such situations is to apply talcum powder and plant starch (anti sticking spray powder) to the side and surroundings of the sticker cutting area before offset printing after cutting the sticker, so that the sticker liquid can be wiped off and applied, thereby avoiding the problem of sticker flow caused by roller pressure and weather conditions. The effect is very good.
Adhesive printing, due to the thickness of the paper, can easily cause "stuffiness" when multiple stickers get stuck in the embossing and rubber cylinder. Therefore, before printing, it is necessary to carefully adjust the electrical devices such as the double sheet control and skew control appropriately. During double sheet control, the distance between the double sheet control wheel and the feed roller should not be less than two sheets of paper thickness, but not more than three sheets of paper thickness, otherwise the curved paper will stop when passing through the controller; Alternatively, the dual tension has already passed through the controller, but the two contacts of the controller power supply have not yet made contact, which cannot achieve the purpose of controlling the dual tension. During work, it is necessary to promptly clean the dust, dirt, or insulation on the surfaces of the dual control wheel and the paper feed roller, or the two contact surfaces at the power control point, to prevent the failure of the dual control system and the occurrence of paper blockage, jamming of the rubber cylinder and impression cylinder.
Here are three measures to prevent sticker printing from getting dirty.
1. The dirt on the back of the sticker is due to the poor ink absorption of the copperplate paper on the surface of the sticker. When printing, try to use the original ink barrel without adding ink adjusting oil, and add some debonding and anti sticking agents appropriately. Do not add dry oil when the weather is hot. Printing full plates on the ground is often prone to back sticking and dirt, which is usually solved by powder coating. Although the anti sticking powder coating for printing contains pure plant-based materials with good dispersibility and flowability, the use of powder coating directly affects the surface gloss of the printed product, making the ink color dull, polluting the environment, and also affecting the accuracy of the offset printing machine.
2. Pay attention to the balance of offset printing ink and control the moisture content of the printing plate. On the premise of not dirtying the printing plate, use the minimum amount of moisture on the plate. The adhesive should be smooth and polished. When printing on the solid surface of the plate, print deep colors first, and print enough ink to ensure that the back is not sticky or dirty. Then, apply a thin layer of base color overlay to achieve better smoothness of the printed product.
3. Overcoming the disadvantage of large water and ink in offset printing, the ink cannot be adjusted too thin, as it is easy for the back to get dirty. If it is too thin, some new ink can be added to enhance the viscosity of the ink.
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