Aluminum Foil Stamping Failure Causes and Troubleshooting Techniques

1. Hot stamping is not strong. There are many reasons why hot stamping is not strong, and the processing methods are also different. To sum up, there are mainly the following three kinds.

1 If the hot stamping temperature is low or the pressure is light, the hot stamping temperature and pressure can be readjusted when the hot stamping is not firm.

2 In the printing process, the dry oil added to the ink is too much, so that the surface of the ink layer is dried too quickly to cause crystallization, so that the printing foil is not hot stamped. The solution is to prevent crystallization from occurring as much as possible during printing. Secondly, after the crystallization is completed, the stamping foil can be removed. After the heating, the printed product is air-compressed and the crystallized layer is destroyed first. India.

3 Add appropriate amount of wax-containing lighter, anti-sticking agent, or non-dry oily material to the ink, which will also result in poor hot stamping. The solution is to first apply a layer of highly absorbent paper on the printing plate to press it once again, adsorb the wax and non-drying oil on the ink layer, and then perform the hot stamping operation.

2. The hot stamping image is faint and dizzy.

During the hot stamping process, it was found that the failure of the picture and text was faint and dizzy, which was mainly caused by the high stamping temperature and the coking aluminum foil. If the hot stamping temperature of the printing plate is too high, so that the galvanized aluminum foil exceeds the limit that can be tolerated, at this time the hot stamping, the galvanized aluminum foil will expand around, resulting in fainting, hair false phenomenon, must be adjusted according to the characteristics of the aluminum foil The range.

For galvanized aluminum foil coking, the main reason is that the shutdown during the hot stamping process is too long, so that a certain part of the galvanized aluminum foil comes into contact with the electrothermal high-temperature printing plate for a period of time and the phenomenon of heat coking occurs, and the graphic and text will become dizzy after hot stamping. Therefore, in case of shutdown in the production process, the temperature should be reduced or the electro-aluminum foil should be removed. Alternatively, a thick paper can be placed in front of the higher-temperature plate to isolate the electro-aluminum foil from the plate.

3 writing is vague, paste version.

The main reasons for this failure are the high stamping temperature, the excessive thickness of the electro-aluminum aluminizing layer, the excessive embossing force, and the looseness of the electro-aluminum installation. According to the specific circumstances to take appropriate measures to resolve. Excessive hot stamping temperature is the main cause of illegible writing and stencil. During the hot stamping process of aluminum foil, if the printing plate temperature is too high, the film base layer and other film layers will transfer and stick, resulting in illegible writing and stencil. Hot stamping should be based on the temperature of the application of aluminum foil, the appropriate reduction in the stamping temperature. In addition, we should choose a thin aluminum aluminized layer, adjust the appropriate pressure, and properly adjust the pressure of the pressure roller and the winding roller tension.