Aluminum foil is a high-grade packaging materials, can replace a large area of aluminum foil bronzing, hot silver, printed products magnificent, not only improve the grade of packaged goods, and improve the packaging of goods display value, widely used in high-end goods Trademarks and packaging. Aluminum foil in the field of food and medicine and other packaging is also widely used, aluminum foil and plastic film composite, the effective use of high temperature cooking and completely shading characteristics, made of cooking bags, can be packaged cooking food, multi-layer composite film also For small biscuits, snacks, beverages and other small food packaging.
First, the characteristics of aluminum foil and production
Aluminum foil is characterized by: metallic luster, good light protection, heat and light have a high ability to reflect the metal luster and reflection ability can improve the brightness of printed color; good isolation, strong protection, impermeable gas and water vapor, To prevent the contents of moisture absorption, gasification, not susceptible to bacterial and insect damage; shape stability, and is not affected by changes in humidity. Easy to process, can be printed on the foil, the difference, embossing, surface coating, glue on the paint; can not be force, no sealing, pinhole and easy wrinkles and so on, so under normal circumstances not alone Use, usually with paper, plastic film processing into a composite material, to overcome the shortcomings of the lack of sealing, isolation and other advantages have also been fully play.
Aluminum foil production refers to the whole process from the beginning of the aluminum foil to the processing of the foil, which is a continuation of the cold rolling process of the aluminum strip. Aluminum foil blanks are hot-rolled billet and cast billet two, cold rolled into a thickness of 0.4-0.7mm aluminum foil wool, and then by roughing, rolling and finishing to obtain different thickness of aluminum foil. The specific process of production of aluminum foil is based on the type of alloy produced by the product, the product specifications, product quality requirements, the number of production and production equipment specifications, production capacity and other factors to determine. The overall production process for aluminum foil (thickness 0.0065mm-0.007mm) for flexible packaging is: aluminum ingot smelting - casting rolling - cold rolling - intermediate annealing - cold rolling - aluminum foil wool - rough rolling - In the rolling - finishing (double) - cutting - finished annealing - packaging.
Second, the aluminum foil printing process
Aluminum foil printing can be used for letterpress printing, gravure printing and flexographic printing. Toppan printing for small batch printing, gravure printing and flexographic printing for large quantities of paper roll printing. The printing process to take the following measures: the need for greater printing pressure. Aluminum foil has strong barrier properties, poor absorbency, and pressure to allow the plate and aluminum foil surface to contact with the largest area and forcing the ink to adhere. Requires strong adhesion of ink, drying speed, fast. Can be used printing ink, resin-type offset fast ink or offset printing and plastic ink mixed ink. Ink generally need to add driers to improve the drying rate, such as gravure printing must be installed hot air drying device. Select the ink on the machine must first play a sample, to detect its hue, drying, etc. meet the requirements.
In the current packaging substrate, aluminum foil barrier is the best, aluminum foil is a high-grade printing and packaging materials, aluminum foil printing in recent years has been gravure industry is an important branch. The use of aluminum foil in the packaging is mainly used for trademarks and some high-end food packaging such as beer,
Force packaging, etc., and paper, plastic, aluminum foil with thin, crisp, easy to wrinkle the characteristics of the printing process often have some problems.