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[China Aluminum Industry Network] 1. Pre-press process design Due to the poor wear resistance of vacuum aluminum-plated prints, low gloss, easy-to-break material, and easy-to-blanch crease lines, it can directly lead to poor molding. , Stiffness of the material is not good, printing ink will have minor cracks and other issues. Therefore, in addition to the selection of high-quality aluminized paper, in the design of the printing process, the characteristics of the aluminized paper should be used as far as possible to avoid weaknesses. For the design of printing and graphic design, the pattern text should avoid the use of a large area of ​​opaque ink as the background color, and use the exposed bottom effect to highlight the unique metallic luster color of the aluminized paper. For offset dot images, the area is preferably small, large areas of four-color overprinting are avoided, and spot color printing is often used to increase color saturation. The color chosen should try to highlight the metallic luster and gloss of the aluminized paper and use less contrasting spot colors. Choosing inks should also be printed with as good transparency as possible. Pay attention to the effect of the metal luster of the aluminized paper on the ink, and the different background colors of the paper will have different color effects. If printed on the aluminum layer transparent yellow, golden yellow. Small texts and lines should avoid overprinting so as not to expose the bottom or color, increase overprinting difficulties, and increase the rejection rate. Try not to print a large-area spot color block at the crease line to prevent the appearance of white or crease lines, and to compensate for the lack of material folding. Learn more about the printing performance of the aluminized paper, the post-press processing technology and the requirements of the customer's packaging process on the machine, fully consider the printing special characteristics of the aluminized paper, and use the extreme colors together.
2. Selection of inks Vacuum aluminum paper suitable for UV
Ink printing can be used offset printing, screen printing, gravure, etc., but different printing methods require different inks. Because vacuum aluminum-plated paper is not resistant to friction, during the printing process, attention should be paid to minimizing the number of overprints and the speed should not be too fast. In addition, the technological formula of the aluminum-plated material can be adjusted according to specific conditions, and when the paper is hard, it is easy to crack. When the paper is soft, it is not wearable; generally, the viscosity of the ink is lowered to avoid affecting the composite effect of the product. The selection of ink should pay attention to the matching of the ink and the printing material. The surface coating of the aluminized paper is suitable for water-based coating; the water content of the aluminized paper is controlled at 5%-6%. For the cracking problem of vacuum aluminized paper, this usually occurs only one or two months after printing or even packaging. In order to avoid the occurrence of such a situation, a printing test is generally required to be performed for a period of time in order to detect it. Material stability, mass production after the material is qualified.
(1) offset printing, screen printing. The aluminum layer ink of vacuum aluminum-plated paper has poor ink adsorption, especially when the offset printing is performed, the process of ink penetration, polymerization, oxidation, conjunctiva, and drying on the vacuum aluminum-plated paper is longer. Due to poor adhesion, sometimes the ink breaks at the folds. UV offset printing inks can be tested for POP inks, and the viscosity of the inks should also be noted. Offset and screen printing should be based on the drying speed of the ink to determine the boot speed, offset water control to the dirty version prevail. Many vacuum aluminum coated paper manufacturers often back coat water for the convenience of later drying, but they do not perform backwater treatment before they are provided to the printing company, making the aluminum coated paper easy to curl during the printing process. The surface of the aluminized paper itself has a certain amount of fine pores. Water can penetrate into the paper and the importance of moisture control can be seen. Aluminizing paper printing should pay special attention to the fastness and color of the ink. For the fastness of the ink, there are mainly two cases. First, the ink after printing is used to pull off the ink to be printed first; second is after printing. The ink layer on the surface of the paper is not firm enough to pull off. For the solution, the former proposes to increase the UV curing intensity of the color file or use a wet and wet overprint to complete the curing process at the delivery site at one time; the latter uses a high-toughness UV-curing ink and adds a special varnish to the ink. Adjust its viscosity. As for the problem of color explosion, the general solutions are: first, the use of water-based varnish before UV printing; second, the use of special color blocks to increase the thickness of the ink layer twice to increase the folding resistance; the third is to choose the high toughness Ink.
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