Burst lines at the indentation: Surface color and pressure issues

If there are large areas of dark solid on the surface of printed matter, especially in blue or black, it is prone to color and line cracking after die-cutting. Reducing ink additives in dark ink during printing can enhance the adhesion of the ink. In addition, when the thickness of the paper or board is too large, the problem of wire breakage is likely to occur during the die-cutting process, and the height of the die-cutting steel wire needs to be reasonably selected. Adjusting the pressure to ensure the smooth separation of the waste edge is also an important measure to avoid wire breakage.

Bursting at the crease: Paper brittleness and moisture content

In a dry environment, when the paper is brittle and hard with low moisture content, especially after high-temperature polishing, it is prone to thread breakage during die-cutting. Increasing the moisture content of paper can enhance its flexibility, thereby avoiding or alleviating this problem. At the same time, if there is a burst line when pasting the box, a small amount of water can be applied to the crease to relieve it.

Deviation of die-cutting and indentation positions

During the die-cutting process, improper installation of the positioning system and the mold is the main cause of the deviation in the indentation position. The positioning system needs to be inspected to ensure its accuracy. In addition, if the mold is not installed horizontally or securely, it may also cause deviations in the position of the indentation. In addition, if the paper size does not match the preset, it will also affect the indentation position. The size of the paper should be carefully checked to ensure it is consistent with the preset. In addition, changes in environmental factors can also affect the die-cutting and creasing positions. Cerrar needs to closely monitor environmental changes and adjust process parameters accordingly.

The quality of the die-cutting and creasing line does not meet the standards

The common reasons for the substandard quality of die-cutting creasing lines are wear of the die-cutting plate, insufficient pressure or poor quality of the cardboard. The wear of the knife plate will lead to a decrease in the clarity of the die-cutting indentation. At this time, the knife plate needs to be replaced in a timely manner or sharpened. If the die-cutting pressure is insufficient, it will result in shallow die-cutting creasing and unclear lines. Increasing the die-cutting pressure appropriately will solve the problem, but it is also necessary to avoid excessive pressure causing damage to the cardboard. Poor quality of cardboard, such as uneven fiber distribution or inconsistent thickness, can also affect the die-cutting and creasing effect. Cardboard with stable quality should be chosen.

The position of the die-cutting creasing line does not match the position of the printed product

During the cardboard processing, it is sometimes found that the position of the die-cutting crease line does not match the position of the printed product. This is usually caused by errors in the die-cutting knife plate manufacturing process. For products with high precision requirements, it is recommended to use laser plate-making. In addition, the inconsistent specifications of the cardboard gripper may also lead to insufficient positioning and moving distance after the die-cutting machine, thereby affecting the accuracy of the position. The deformation or stretching of cardboard fibers caused by different working environments can also affect the accuracy of die-cutting and creasing. It is necessary to try to keep die-cutting and creasing in the same environment as printing, or ensure the consistency of the environment (such as temperature, humidity, etc.).