What's the reason for the lack of stamping or stamping?
In printing inks, additives such as wax reducing agents and light agents are added. Even under high temperature and high pressure, the hot melt adhesive in anodized aluminum foil is difficult to bond with such additives.
Ink crystallization: the ink surface is too smooth, can not make anodized aluminum foil adhesive on it. In order to prevent the crystallization of ink, the additives in the ink should be controlled.
Printing printing ink layer too thick: color ink layer thick substrate, the substrate surface will prevent the adsorption of aluminum foil stamping of the adhesive, the foil adhesion decreased, resulting in hot stamping or not.
Choice of anodized aluminum foil is not suitable for substrate, or affect the fastness of hot stamping.Stamping temperature is too low or too low pressure.
