Troubleshooting And Influencing Factors In Bronzing

1. no hot stamping. Hot stamping Untrue

This is related to many factors such as the surface characteristics, the properties of anodized aluminum, the temperature and pressure of stamping. 1, there are too many powder sprayed on the surface of the printing piece, or the surface contains additives such as tackifier and glossy paste, which will impede the adsorption of aluminum and paper. Solution: surface powder treatment or in printing process. 2. Improper selection of anodized aluminum directly affects the fastness of bronzing. According to the size of the gold stamping area, the type of electrified aluminium should be chosen comprehensively considering the characteristics of the hot stamping material. 3, do not correctly grasp the matching between bronzing equipment and pressing time and stamping temperature, affect the printing fastness and clarity of image and outline. Because of different equipment, hot stamping material, pressing time and hot stamping temperature are different. For example, the high speed circular press is fast and the contact temperature of the stamping line is higher than that of the flat or flat press. Under normal circumstances, the circular stamping temperature is between 190 and 220 degrees, and the flattening is about 130 to 150 degrees. The flatness is about 100 to 120 degrees. Of course, the pressing time, the stamping temperature and the production efficiency are also largely restricted by the transfer performance of electrified aluminum.

2. anti pulling

　　 Backward pull It means that after electrification, the electrified aluminum will pull away the printing ink or printing varnish. The main reason is that the ink on the surface of the printing product is not dried or the surface of the printing product is not processed properly after UV, which results in the inability of printing ink and UV oil to bond with the surface of the paper. Solution: hot stamping after printing. In addition, anodized aluminum with low separation power and excellent thermal transfer can be selected.

3. paste and hot stamping after electrified aluminum discoloration.

Paste plate is mainly due to poor stamping, poor installation of anodized aluminum or aluminum foil incorrect. After hot stamping, the discoloration of electrified aluminium is mainly caused by high temperature of hot stamping. In addition, the crinkle of electrified aluminium is easy to cause hot stamping and uneven color change. It can be solved by lowering the temperature appropriately. For circular press type, fan can be installed at the foil feeding place to keep the foil floating, and avoid burning aluminum before touching the foil.

4. improper process arrangement destroys the gloss on the surface of anodized aluminum.

Plastic film mulching Gilding People often worry. Gold foil It is easy to wipe off and then hot stamping and then laminating. This is easy to cause: (1) film (especially matte film) will destroy the gloss of the surface of anodized aluminum, and it is not suitable to use water-soluble glue film, otherwise it will cause blackening on the surface of the audio-chemical aluminum, and at the same time, it will easily cause the gold powder to stick to the edges of the picture and make the hair void. 2. After stamping, it is depressed due to pressure, and glue is not easy to permeate the surface of anodized aluminum. It is easy to separate the OPP from the paper and affect the quality of the product. The correct process is to first film and then hot stamping, and choose OPP compatible aluminum. In short, there are many factors that affect the quality of bronzing. Making high quality bronzing plates and correctly controlling the gilding are the key to improve the quality of bronzing.