Aluminum foil is a high-grade packaging material, which can replace large-area anodized aluminum bronzing and hot silver. The printed products are magnificent, which not only improves the grade of packaged goods, but also enhances the display value of packaged goods. It is widely used in high-end goods. Trademarks and packaging. Aluminum foil is widely used in packaging fields such as food and medicine. Aluminum foil and plastic film are combined to effectively utilize high temperature cooking and complete shading. It is made into a retort pouch, which can be packaged as cooked food, and a multi-layer composite film. It is used for small food packaging such as biscuits, snacks and drinks.
In recent years, the application range of aluminum foil packaging has been continuously expanded. In addition to pharmaceutical packaging, food packaging and health care product packaging have been applied, which has promoted the continuous improvement of aluminum foil printing technology in China. Now, the aluminum foil can be printed on both sides. Not only can print a color of the product, but also can be printed in a multi-color variety of colorful text patterns, the surface of the aluminum foil is coated into a faux gold foil and other colors are displayed in front of the consumer, such a packaging form makes people feel noble Gorgeous, love it, played a good role in publicity and protection of products.
The characteristics of aluminum foil are: metallic luster, good light protection, high reflection ability to heat and light, metallic luster and reflection ability can improve the brightness of printing color; good insulation, strong protection, non-breathable body and water vapor, Prevent the contents from moisture absorption and gasification, and are not easily attacked by bacteria and insects; the shape is stable and is not affected by humidity changes. Easy to process, can print aluminum foil, poor color, embossing, surface coating, sizing, etc.; can not be stressed, no sealing, pinhole and easy wrinkle, so it is not alone in general It is usually processed into a composite material with paper and plastic film, which overcomes the shortcomings of no sealing property, and the advantages of insulation are also fully exerted.
Aluminum foil production refers to the whole process from the beginning of the aluminum foil wool to the processing of the foil. It is a continuation of the aluminum strip cold rolling process. The billet of aluminum foil has two kinds of hot rolled billet and cast billet, which are cold-rolled into aluminum foil wool having a thickness of 0.4-0.7 mm, and then obtained by rough rolling, medium rolling and finish rolling to obtain aluminum foil of different thicknesses. The specific process for producing aluminum foil is determined according to the alloy type, finished product specification, product quality requirements, production quantity, production equipment specifications and production capacity of the products produced. The overall production process of aluminum foil for flexible packaging (thickness: 0.0065mm - 0.007mm) is: aluminum ingot smelting - casting rolling - cold rolling - intermediate annealing - cold rolling - aluminum foil wool - rough rolling - Medium rolling - finish rolling (double) - slitting - finished annealing - packaging.
Aluminum foil printing can be used for relief printing, gravure printing and flexographic printing. Letterpress printing is suitable for small batch printing, gravure printing and flexographic printing for high volume roll paper printing. The following measures must be taken during the printing process: large printing pressure is required. The aluminum foil has strong barrier properties and poor absorbency, and the pressure causes the surface of the printing plate and the aluminum foil to contact with a large area and forcibly adhere the ink. The ink is required to have strong adhesion and a fast drying speed. A printing ink can be used, and the resin type offset printing fast fixes the ink or the mixed ink of the offset printing and the plastic ink. A drier is usually added to the ink to increase the drying speed. For example, a gravure printing device must be installed with a hot air drying device. Before selecting the ink on the machine, you must first make a sample to check whether the hue, dryness, etc. meet the requirements.
In the current packaging substrate, the barrier property of aluminum foil is better. Aluminum foil is a high-grade printing and packaging material. In recent years, aluminum foil printing has become an important branch of the gravure printing industry. The application of aluminum foil in packaging is mainly used for trademarks and some high-grade food packaging such as beer top labels, chocolate packaging, etc. Compared with paper and plastic, aluminum foil has the characteristics of thin, brittle and easy to wrinkle, which is often seen in the printing process. Some problems have arisen.