In the process of new product design and development, in order to highlight the theme of the product, craftsmen often use a special hot stamping process, that is, the hot stamping process followed by the printing process. During the implementation of this process, the hot stamping foil is often pulled back by the printing ink, which not only seriously damages the design effect, but also is very disadvantageous to the printing equipment. Because the hot stamping foil powder that is pulled back will quickly accumulate on the blanket, at least the image dots will be lost, and the partial image will not be printed.
Not only that, hot stamping foil powder will also reach the ink roller through transfer, accelerate the wear of the ink roller, and cause damage to the printing equipment. From the above analysis, it can be seen that if you want to use the hot stamping first printing process, you must eliminate the problem of hot stamping foil being pulled back in the printing process, to solve the hot stamping foil is pulled back from the following two aspects.
1. Control of hot stamping quality
The quality of hot stamping is a prerequisite for ensuring the normal progress of subsequent printing production. First of all, according to the different surface properties of the paper, select the appropriate hot stamping foil. After the hot stamping, the anodized aluminum foil generally has a great contrast with the background. You do not need to worry about the brightness effect of hot stamping. The key is to ensure that the hot stamping foil is firmly attached to the surface of the paper.
To achieve this goal, in addition to choosing hard work on hot stamping foil, it is also necessary to strictly regulate the operating procedures of machine personnel. In addition to requiring the machine personnel to control the stamping temperature, stamping pressure and stamping speed, it is more important to regularly test the adhesion of the stamping layer. Because in the hot stamping process, the adhesion between the hot stamping layer and the paper may change as the number of hot stamping increases.
Adhesion test adopts the adhesive test method specifically: stick the tape to the hot stamping layer, and quickly pull off the tape. Generally speaking, if the hot stamping layer can't be pulled off, there will be no problem of ink reverse pulling hot stamping foil during printing. If the hot stamping layer is pulled away by the adhesive tape, it indicates that the hot stamping layer is not firmly attached and needs to be re-calibrated. When the calibration pressure reaches a certain number of times, the stamping quality will tend to a stable state.
2. Control of printing process
Generally, the viscosity of offset printing ink is relatively high, and the pulling force on the surface of the paper is large during the printing process. This contradiction can be alleviated by appropriately reducing the viscosity of the ink. In addition, in the case of ensuring normal printing, the smaller the printing pressure, the better.
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Picture of custom earring Jewelry Box
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