The effect of hot stamping temperature on hot stamping quality is very obvious. If the temperature is too low, the isolation layer and adhesive layer of the anodized aluminum will not melt sufficiently, which will cause the hot stamping to fail or the hot stamping to not be firm, resulting in incomplete blotting and flowering. The hot stamping temperature must not be lower than the temperature-resistant range of anodized aluminum. The lower limit of this range is to ensure the melting temperature of the anodized aluminum adhesive layer. If the temperature is too high, the hot-melt film will be melted out of range, causing aluminum paste to adhere to the surrounding area of ​​the print, and the paste will be produced. Cloudiness appears; high temperature will also lead to oxidation of the surface of anodized aluminum plating layer and dyeing layer, making the hot stamping product lose its metallic luster and reduce brightness.
Factors that should be considered to determine the optimal hot stamping temperature, including the type and performance of anodized aluminum, hot stamping pressure, hot stamping speed, hot stamping area, hot stamping structure, the color, thickness, and area of ​​the underlying ink layer of the printed product And the room temperature of the hot stamping workshop. When the stamping pressure is low, the machine speed is fast, the background ink layer of the printed product is thick, and the room temperature is low, the stamping temperature should be appropriately increased. The general range of hot stamping temperature is 70 ~ 180 ℃. After the optimal temperature is determined, it should be kept as constant as possible from beginning to end to ensure the quality of the same batch of products is stable.
When there are different graphics and text structures on the same page, the same hot stamping temperature often cannot meet the requirements at the same time. There are two solutions to this situation: one is to choose two different models of anodized aluminum at the same temperature; the other is to use two electric heating plates under the conditions allowed by the layout (such as a large interval between two pictures and text) , It is controlled by two voltage regulating transformers to obtain two different temperatures to meet the needs of hot stamping.
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