The exquisite printed patterns on the chocolate gold coin aluminum foil packaging of chocolate gold coins can not only attract consumers' attention, but also carry brand image and product information, and the durability of the pattern color is directly related to the display effect of the packaging during the shelf life.
First of all, the commonly used printing processes for chocolate gold coin aluminum foil packaging include gravure printing, relief printing and flexographic printing. Gravure printing is widely used in chocolate gold coin packaging printing because it can achieve rich color levels and high-resolution pattern details. The principle is to fill the ink in the groove through the engraved printing plate with patterns, and then transfer it to the surface of the aluminum foil. This process can accurately control the thickness and distribution of the ink, laying the foundation for the vividness and durability of the color.
The choice of ink is crucial to the durability of the pattern color. According to the characteristics of the aluminum foil surface, special inks with strong adhesion, friction resistance, light resistance and chemical resistance are required. For example, inks containing special resin components are used, which can form a strong chemical bond with the surface of the aluminum foil to reduce the shedding of ink during subsequent processing, transportation and storage. At the same time, the quality of the pigment also determines the stability of the color. High-quality pigments are not easy to fade under light and oxidation conditions.
The drying process after printing is one of the key links to ensure the durability of the color. Usually, thermal drying or UV curing drying technology is used. Thermal drying evaporates the solvent in the ink by increasing the temperature, causing the ink to solidify on the surface of the aluminum foil. UV curing uses ultraviolet radiation to trigger a chemical reaction in the photoinitiator in the ink, instantly curing the ink. Reasonable control of the drying temperature, time or ultraviolet intensity can ensure that the ink is fully dried and solidified, enhance the bonding between the color and the aluminum foil, and prevent color migration or fading.
In terms of post-processing technology of packaging, such as lamination or varnishing, the durability of the pattern color can be further improved. Lamination can form a protective film on the surface of the printed pattern to prevent external factors from eroding the ink. Varnish can increase the gloss and wear resistance of the pattern, and at the same time play a certain isolation role. For example, the use of water-based varnish is both environmentally friendly and can effectively improve the durability of the pattern, so that it remains bright and beautiful during long-term display.
In addition, the conditions of the chocolate gold coin aluminum foil packaging in the storage and sales environment will also affect the color durability of the pattern. High temperature, high humidity or long-term light exposure will accelerate the aging and fading of the ink. Therefore, when designing the packaging, these factors need to be taken into account. By optimizing the printing process and selecting appropriate materials, the adverse effects of environmental factors on the color of the pattern can be minimized to ensure that the chocolate gold coin can attract consumers with its exquisite packaging image throughout the shelf life.
