The key points to improve the bronzing process of stamping foil.
When we are hot stamping foil, we all want to get the best hot stamping effect, so what should we do to get the best effect? Three factors must be considered first: hot stamping temperature, hot stamping pressure, and hot stamping speed. As long as you master these three points, the effect of the hot stamping foil will definitely make you very satisfied.
When hot stamping, first control the temperature of hot stamping. The hot stamping temperature has a great influence on the melting degree of the hot-melt silicone resin peeling layer and the adhesive. The hot stamping temperature must not be lower than the lower limit of the anodized aluminum temperature resistance range, which is the minimum to ensure the melting of the anodized aluminum adhesive layer temperature.
If the temperature is too low, the melting will not be sufficient, which will cause the hot stamping to be repaired or the hot stamping is not firm, so that the imprint is not explained, incomplete, missing or scratched; while the temperature is too high, the melting will be excessive, resulting in The anodized aluminum attached to the periphery of the print also melts off and produces a paste. At the same time, high temperature will oxidize and polymerize the synthetic resin and fuel in the color layer, blistering or fogging in the print, and will cause the surface of the aluminum layer and protective layer to oxidize, reducing the brightness of the hot stamping product or losing its metallic luster. Generally speaking, the electric heating temperature should be adjusted between 80-180°. Because the hot stamping area is relatively large, the electric heating temperature is relatively higher; otherwise, the temperature will be lower. The specific situation needs to be determined according to various factors such as the actual temperature of the printing plate, the type of anodized aluminum, the image and text status, etc. Usually, it is necessary to find the most suitable temperature through trial ironing. The lowest temperature and clear image should be imprinted. Lines are standard.
Secondly, we must reasonably control the pressure of hot stamping. The hot stamping pressure has a great relationship with the adhesion fastness of anodized aluminum. Even if the temperature is right, if the pressure is not enough, the anodized aluminum will not stick firmly to the substrate, or cause color fading, imprinting, etc.; on the contrary, if the pressure is too high, it will cause the liner and the substrate to compress too much. As a result, the phenomenon of paste or print becomes thick. Therefore, the hot stamping pressure needs to be adjusted carefully.
When setting the hot stamping pressure, you need to consider the properties of anodized aluminum, hot stamping temperature, hot stamping speed, substrate, etc. Generally speaking, as long as the paper is strong, smooth, the printed ink layer is thick, and the hot stamping temperature is high and the speed of the car is slow, the stamping pressure will be lower; on the contrary, the pressure will be greater. In addition, pay attention to the liner for hot stamping. For smooth paper, such as coated paper and glass cardboard, it is best to choose hard liner paper, so that the print will be clearer; on the contrary, for poor smoothness and roughness For paper, the liner should be softer, especially when the hot stamping area is relatively large. In addition, the hot stamping pressure must be uniform. If you find that local hot stamping or tingling is found during trial printing, the pressure at this position may be uneven. At this time, you can pad thin paper on the flat plate at this position and make appropriate adjustments.
Finally, look at the speed of bronzing. Under normal circumstances, if the hot stamping speed of the hot stamping material is slow, the adhesion fastness is good, but if the hot stamping speed is too slow, it will affect the production progress. If the hot stamping speed is too fast, the time for the hot stamping foil to contact the substrate will be short, and the adhesive layer and the peeling layer will not be able to melt sufficiently, resulting in difficult peeling and weak adhesion to the substrate. Therefore, the hot stamping speed should be appropriate. At the same time, the hot stamping speed must be compatible with the stamping pressure and temperature. Good bronzing foil, suitable for high-speed bronzing machines. As long as you grasp the parameters of the hot stamping process, it is the key to improve the hot stamping process of printed matter.