Causes and quick solutions of Paper Boxes printing jams

Causes and quick solutions of Paper Boxes printing jams

In the Paper Boxes printing production process, the printing screen often appears jammed, once the jamming not only reduces the printing quality but also greatly affects the printing efficiency. It is even more unfortunate that the products printed by the outlets are often large customers, such as the cartons of fast-moving consumer goods such as Wahaha and Mengniu. These orders are large, and it is often necessary to stop the printing plate for printing a thousand sheets. Once the plate is jammed, it will increase a lot of downtime, resulting in low production efficiency and loss of carton production. How to start to solve the problem of plugging.

Generally speaking, there are more and more delicate carton outlets for FMCG products, so what causes the problem of jamming? We usually find that it is the ink and printing plate and the operation that causes the jamming.

1. Ink

1. During printing and production with poor ink fluidity, some operators like to adjust the ink return to the ink cartridge slower, so that the amount of ink between the anilox roller and the rubber roller is more. This method is suitable for full-page printing, because the ink flow is slow, which leads to an increase in the amount of ink on the printing plate, but the printing of dots or fine characters will cause the phenomenon of jamming. Solution: To prevent the printing jam, the fluidity of the ink must be accelerated, which can be solved by adjusting the air pressure of the ink supply pump.

2. The ink dries too fast. When the ink is transferred from the anilox roller to the printing plate, when the printing plate is transferred to the paper, the ink dries on the printing plate because the ink dries too fast, so that the accumulation of ink on the printing plate forms plugging phenomenon. Solution: This situation is better to judge. When wiping the printing plate, the ink on the printing plate is difficult to wipe, which is generally caused by the ink drying too fast, which can be solved by adding new ink or slow drying agent.

3. The ink viscosity is too high, and the ink viscosity is too high will also cause the blockage. The reason is the same as the poor fluidity. It can be solved by reducing the viscosity of the ink.

Once again, the dust and paper powder in the ink fall into the ink, and the dust is transferred to the printing plate through the ink system. You can install a filter screen in the ink inlet tube, and the mesh should be 120 mesh. To control the printing viscosity and improve the printing color density, it is generally appropriate to control the viscosity at about 9 seconds.

Second, the printing plate does not match the anilox roller

The printing plate is mainly due to the mismatch between the printing and the anilox roller. For example, a 300-mesh anilox roller needs to print a pattern of 80 lines, so the ratio will often jam the plate, because the mesh of the 300-mesh mesh is too large, and the ink is too large. The amount of transfer will lead to too much ink on the printing plate, causing printing dot plugging, which will cause the printing plate to not match the anilox roller.

Solution: The conventional ratio is 1:4.5, which is more reasonable.

3. Personnel operating errors

In terms of personnel operation, the printing plate is deformed due to excessive pressure, which causes the expansion of printing dots, and the resulting dots are blocked. The printing pressure gap is generally about -0.3 mm of the thickness of the cardboard.

Liberation method: To train production operators to prevent the phenomenon of printing jamming caused by excessive printing pressure.

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