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How to solve the problem that the hot stamping paper is pulled back by the ink



In the process of designing and developing new products, in order to highlight the product theme, technicians often use a special hot stamping process, that is, hot stamping before hot stamping. In the implementation process, the Hot stamping paper often has the problem of being pulled back by the ink, which not only seriously damages the design effect, but also has great harm to the printing equipment. Because the gold paper powder that is pulled back will quickly accumulate on the tape, this will cause the dots in the image to be lost, and the partial image will not be printed in the reprint.
 
  1. Hot stamping quality control
The quality of hot stamping is a prerequisite for ensuring the normal production of subsequent printing. First, select the appropriate bronzing paper according to the nature of the paper surface. After the aluminum foil is hot stamped, it is usually very contrasted with the background. Don't worry about the brightness effect of hot stamping. The key is to ensure that the hot stamping paper is firmly attached to the surface of the paper.
In order to achieve this goal, in addition to efforts to select hot stamping paper, the operating procedures of the machine operators should also be strictly regulated. In addition to requiring the mechanic to control the hot stamping temperature, pressure and speed, it is more important to periodically test the adhesion of the hot stamping layer. Because in the hot stamping process, as the amount of hot stamping increases, the adhesion between the hot stamping layer and the paper changes.
The adhesion test method was used to test adhesion. Specifically, the tape is stuck to the hot stamping layer and the tape is quickly pulled down. In general, if the hot stamping layer cannot be pulled down, there is no problem that the ink pulls back the hot stamping paper. If the hot stamping layer is pulled down with tape, the hot stamping layer is not firmly attached and needs to be recalibrated. When the calibration pressure reaches a certain number of times, the hot stamping quality tends to be stable.
  2. Printing process control
In general, offset inks have high viscosity during printing and have a large pulling force on the surface of the paper. Properly reducing the viscosity of the ink can alleviate this contradiction. In addition, under the condition that the printing is normal, the printing pressure is as small as possible.