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Analysis of hot stamping failure or false stamping

February 19, 2024

The hot stamping is not good or the hot stamping is not true. This is related to the surface characteristics of the printed parts, the nature of the anodized aluminum, the hot stamping temperature and the pressure and other factors. ① Too much powder is sprayed on the surface of the printing piece or the surface contains additives such as debonding agent and gloss paste, which will hinder the adsorption of the anodized aluminum and the paper. Solution: Surface powder removal treatment or solution in the printing process. ② Improper selection of anodized aluminum directly affects the fastness of bronzing. The type of anodized aluminum used should be comprehensively considered according to the size of the gold foil area and the characteristics of the material to be stamped. The domestic anodized aluminum is mainly the Peacock brand series produced by Shanghai Shenyong Bronzing Material Co., Ltd., and the imported anodized aluminum is mainly the PM and LK series of KURZ in Germany, the A, K, and H series in Japan, and the SP series of KOLON in South Korea. .

The selection of anodized aluminum can mainly refer to the following categories: hot stamping on general products (general ink color), anodized aluminum has 88-1 type, KURZ PM type; cigarette packs, cosmetics and other dark ink color printed matter (including gold and silver) Bronzing anodized aluminum has 88-2 type; anodized aluminum with fine handwriting such as cigarette labels and cosmetic packaging has 88-3, 88-4 type, PM288, etc .; suitable for OPP or PET laminated paper and cardboard with UV ink , Glazing paper and other products hot stamping anodized aluminum have 88-4 type, K series, LK series, and SP series. ⑧ Failure to properly grasp the stamping equipment and the matching between the stamping time and the stamping temperature, which affects the stamping fastness and the clarity of the graphic outline.

Due to the different equipment and materials to be stamped, the stamping time and stamping temperature are different. For example, the high-speed circular rounding machine is fast and the stamping line contacts, and the hot stamping temperature is higher than the circular flattening or flattening. In general, the temperature of round pressing and round hot stamping is 190 ℃ ~ 220 ℃, the round pressing is about 130 ℃ ~ 150 ℃, and the flat pressing is about 100 ℃ ~ 120 ℃. Of course, the pressing time, hot stamping temperature and production efficiency are also largely restricted by the transfer performance of anodized aluminum.

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