Knowledge about aluminum foil packaging and printing

Aluminum foil is a high-grade packaging material that can replace large areas of anodized aluminum foil stamping and silver foil. The printed products are magnificent, which not only improves the grade of packaging products, but also improves the display value of packaging products. It is widely used in high-end products Trademarks and packaging. Aluminum foil is also widely used in packaging fields such as food and medicine. Aluminum foil is compounded with plastic film, which effectively utilizes the characteristics of high temperature cooking and complete shading. It is made into a cooking bag, which can be used for packaging cooked food, and multi-layer composite film. Used for packaging small foods such as biscuits, snacks and beverages.

In recent years, the application scope of aluminum foil packaging has continued to expand. In addition to pharmaceutical packaging, food packaging, health care product packaging and other applications have prompted the continuous improvement of aluminum foil printing technology in China, and now it can be printed on both sides of aluminum foil. Not only can print one-color products, but also can print multi-color varieties of colorful text patterns, aluminum foil surface coated into imitation gold foil and other colors are displayed in front of consumers, such a packaging form makes people feel noble Gorgeous, admirable, played a good role in promoting and protecting products.

Characteristics and production of aluminum foil

The characteristics of aluminum foil are: it has metallic luster, good light shielding, high reflectivity to heat and light, metallic luster and reflective ability can improve the brightness of printed colors; good isolation, strong protection, air permeability and water vapor, Prevent the contents from absorbing moisture and vaporization, and not easy to be attacked by bacteria and insects; good shape stability, not affected by changes in humidity. Easy to process, it can be used for printing, color difference, embossing, surface coating, gluing, etc. on aluminum foil; no stress, no sealing, pinholes and wrinkles, so in general, it is not separate When used, it is usually processed into composite materials with paper and plastic films, which overcomes the shortcomings of no sealing and the advantages of isolation are also fully exerted.

Aluminum foil production refers to the entire process from the beginning of aluminum foil wool to the processing of plain foil. It is the continuation of the cold rolling process of aluminum strip. There are two kinds of aluminum foil blanks: hot-rolled blanks and cast-rolled blanks, which are cold-rolled into aluminum foil wool with a thickness of 0.4-0.7mm, and then rough-rolled, medium-rolled, and finish-rolled to obtain aluminum foils of different thicknesses. The specific technological process for producing aluminum foil is determined according to factors such as alloy type, finished product specifications, product quality requirements, output, production equipment specifications, and production capacity. The overall production process flow of aluminum foil for flexible packaging (thickness 0.005mm to 0.007mm) is as follows: aluminum ingot melting-casting and rolling-cold rolling-intermediate annealing-cold rolling-aluminum foil wool-rough rolling Intermediate rolling-finishing rolling (double)-slitting-finished product annealing-packaging.

Foil printing

Aluminum foil printing can use relief printing, gravure printing and flexographic printing. Letterpress printing is suitable for small batch printing, and gravure printing and flexographic printing are suitable for large-volume roll paper printing. The following measures should be taken during the printing process: greater printing pressure is required. Aluminum foil has strong barrier property and poor absorption. The pressure makes the printing plate and aluminum foil surface contact with the largest area and force the ink to adhere. It is required that the ink has strong adhesion, and the drying speed should be fast. Can use iron printing ink, resin offset printing fast fixing ink or mixed ink of offset printing and plastic ink. Drying agent is generally needed in the ink to increase the drying speed. For example, hot air drying device must be installed in gravure printing. Before selecting the ink on the machine, you must make small samples to check whether the hue and dryness meet the requirements.

Among the current packaging substrates, aluminum foil has the best barrier properties. Aluminum foil is a high-grade printing and packaging material. In recent years, aluminum foil printing has become an important branch of the gravure industry. The application of aluminum foil in packaging is mainly used for trademarks and some high-end food packaging such as beer top labels, chocolate packaging, etc. Compared with paper and plastic, aluminum foil has the characteristics of thin, brittle, and wrinkle-prone. Some problems occurred.

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