Cope with label printing "drop ink", and then teach you three necessary skills!

Effect of tension on ink drop and solutions

For film materials with corona treatment on the printing surface, to achieve good ink wetting, the dyne value usually needs to be more than 38mm / m, and the ink drop problem is easy to occur if it is less than 36mm / m; at the same time, the dyne value of this material It will gradually disappear with time, and there will be ink loss during printing. The essence of this problem is the tension problem.

solution:

1. Use a satellite rotator with online corona function to perform online corona treatment to improve the surface energy of membrane materials;
2. Intermittent printing machine can be used for surface priming treatment to improve surface printing adhesion;
3. When the dyne value disappears, it needs to be treated with corona during printing, but the size of the dyne value does not completely represent the oil.
4. The adhesion between the surface material and the general dyne value is generally 3 months to 6 months, so it is recommended to minimize the long-term storage of stock materials.
5. It is recommended to use inks with higher adhesion, and it is recommended to consult ink suppliers.

The effect and solution of ink drying and tension on ink drop

In the printing process, ink drying and tension may also cause ink drop. Specifically divided into: the printing ink layer is too thick to cause incomplete drying; the UV lamp energy is insufficient, the lamp aging, the lamp reflector aging, resulting in insufficient drying and curing of the UV lamp, the ink layer is not dry; the ink is too dry, causing the material to deform and form The ink layer comes off.

solution:

1. The use of deep ink and thin printing is commonly known as reducing the amount of ink. For example, spot color field ink can be matched deeper. In the official printing, the amount of ink is smaller to achieve the proof effect, while increasing the output power of the UV lamp. Reduce the printing speed, increase the exposure time of the UV lamp to achieve the drying effect. This solution is suitable for old intermittent or satellite rotating machines and old UV lamp solutions.
2. Check whether the UV lamp tube is aging, and clean the reflector. Generally, the service life of domestic UV lamps is about 500-1000 hours, and the life of imported lamps is about 1000-2500 hours. For details, please refer to the actual use. It is recommended that the printing factory clean the UV lamp tube every six months or so to ensure normal use.
3. Reduce the output power of the UV lamp. The specific operation is to print the live parts of the general printing factory. The first few colors of the color sequence are mostly logos or small prints. The required light is limited. You can turn on the UV lamp and dry it. High-grade over-irradiation, because the film material has limited absorption of heat energy, excessive irradiation will cause the film material to curl and deform and become brittle, and the ink adhesion will decline. You can follow the principle of using low-end and high-end UV lamps.

Influence of ink and material matching on ink drop and solutions

Finally, the matching degree of the ink and the material will also cause ink drop to a certain extent. For example, if the molecular tension of the ink is too large to form a uniform ink layer on the surface of the substrate material, or if the ink model that exceeds the shelf life or the poor domestic brand ink is used, the ink will be printed off.

solution:

1. Can be switched to an ink that matches the printing material, such as film-specific inks and light- and light-resistant inks;
2. For expired inks, you need to do printing test before printing according to the situation, or print some simple text or small logos, and some low-end products;
3. Printing large-area on-site and full-screen dot net line patterns, it is recommended to use ink with good brand and high adhesion performance.

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