Application of Vacuum Aluminized Paper and Its Ink (I)
Aluminized materials For cigarette marking, it combines the metallic glitter of composite foil jams with PET-coated cardboard and the plasticity of white cardboard. Composite aluminum foil paperboard, also known as 裱 aluminum paperboard, is a direct use of aluminum foil and paperboard composite; PET coated paperboard, is the use of aluminum foil and cardboard composite.
First, the characteristics of vacuum aluminum paperboard
Vacuum aluminum-plated paper, or aluminum-sprayed paper, aluminized paper, and vapor-deposited paper, is a new type of green packaging material that has been applied more and more widely in the packing industry since the 1980s. Some experts predict that at the beginning of the 21st century, vacuum aluminum spray paper will become the darling of China's packaging industry.
The reason why it is called green material is that it adopts the method of vacuum aluminum plating. It only covers a layer of 0.25-0.3 micron (μm) thin and tightly shining aluminum layer on the surface of the cardboard, which is only a composite cardboard aluminum foil layer. One percent. As a result, it has both a metallic feel and a biodegradable, recyclable environmental property.
Vacuum aluminum-plated paper according to its production process can be divided into direct evaporation and transfer evaporation method. The direct method, also called paper surface aluminum plating, is to place the paper directly on the vacuum aluminum plating machine for aluminum plating. This method is limited to the aluminum spray of thin paper, and the loose structure of the aluminized layer and the paper surface fibers are kissed and the surface will be presented. Fine holes, the smoothness is also relatively poor. The transfer method, that is, film surface aluminum plating, is to place the PET film on the vacuum aluminum plating machine after aluminizing, and then compound the glue with the paper, and then strip the PET film, and the aluminized layer is transferred to the paper jam surface by the adhesive effect. Made from.
Compared with the direct method, the advantages of the transfer method are: it can produce paper or paperboard of any thickness; fully utilizes the flatness of the PET film to make the paper metal luster brighter; it can produce rainbow holographic laser anti-counterfeiting and other arbitrary pattern texts as required. Aluminum paper products.
Second, the aluminum plating paperboard process design points
Vacuum aluminum-plated prints have poor wear resistance, low gloss, easy-to-break material, and easy-to-dark white crease lines. This can directly lead to bad markings, poor material stiffness, and poor printing inks. crack.
For this reason, in addition to selecting strong material suppliers, in the section of process design, try to avoid weaknesses by following the characteristics of aluminum-plated paper.
1, pattern text to avoid the use of a large area of ​​opaque ink for the background color, more exposed with the bottom effect, highlighting the unique metallic luster aluminum paper color.
2. When offset dot images are used, the area is preferably small, avoiding large-area four-color overprinting, and spot color printing is often used to increase color saturation.
3. Select the color as much as possible to highlight the metallic color and tendency of the aluminized paper, and use less contrasting spot colors. Choosing inks should also be printed with as good transparency as possible.
4. Pay attention to the effect of the metal luster of the aluminized paper on the ink color effect. Different paper jam backgrounds will have different color effects. If printed on the aluminum layer transparent yellow, golden yellow.
5, small text and lines to avoid overprinting, so as not to reveal the bottom or color, increase overprinting difficulties, increase scrap rate.
6, try not to print a large-area spot color block at the crease line to prevent dew or crease lines, to make up for the lack of material folding.
In short, knowing more about the printing performance of aluminum-plated paper, the requirements of post-printing processing technology and customer's packaging process on the machine, and fully considering the printing particularity of aluminum-plated paper, using the extreme colors together, starting from reality, is the eternal truth.
Third, the application of aluminum paper ink
1, offset printing screen
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 can be subject to dirty version. 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 holes, and water can penetrate into the paper, which shows the importance of water control.
For the fastness of the ink, there are mainly two cases. First, the printed ink after the printing pulls off the ink that is printed first; second, the firmness of the ink layer on the surface of the paper after printing is not easy to pull off. For the solution, the former suggests increasing the UV curing intensity between the color groups or using 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.
For the problem of color explosion, the general solution is: First, before the UV printing, water-based light oil primer; Second, the use of special color block twice the overprint to increase the thickness of the ink layer to increase the folding endurance; Third, try to choose high toughness Ink.
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