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[China Aluminum Network] With the development of the market and the improvement of the economic level, people's demand for the packaging and decoration of products is higher, and the product packaging is colorful. More and more beer packaging using aluminum foil bottle sealing and thin aluminum foil bottleneck labels, such as Zhujiang Beer, Blue Ribbon Beer, Tsingtao Beer, Shengli Beer, Kingway Beer, Draft Beer and so on. With so many aluminum foil bottle-sealing and thin aluminum foil bottleneck labels, it is inevitably necessary to have special inks for aluminum foil package printing, so that gravure aluminum foil ink came into being.
The gravure aluminum foil ink has good printability, easy operation, bright colors, high gloss, good frost resistance and water resistance, and good light resistance. Moreover, after printing with this type of ink, the printed products are well-cut and the alkali-cooking performance is excellent, and can be applied to different depths and speeds. The following is a brief analysis of the characteristics of the application of this kind of aluminum foil ink from the point of view of ink design and production, for reference by the printing manufacturer when using this type of ink.
First, the classification of aluminum foil ink Aluminum foil ink used in the connection material generally nitrocellulose and polyamide resin, aluminum foil ink can be divided into nitrocellulose system and polyamide system.
The nitrocellulose system ink film is hard and brittle, drying fast, easy to absorb water. However, the ink is stable, the storage time is long, and the printability is good. Because the ink film is hard and its adhesion to the aluminum foil is poor, sometimes the polyamide resin is added to reduce its hardness, increase the flexibility, and improve the attachment fastness.
Polyamide system is contrary to nitrocellulose system, ink film is soft and sticky, drying speed is slow, and water resistance is better than nitrocellulose system. However, a single polyamide resin cannot make its application on aluminum foil perfect, but also need to add some phthalate ester plasticizer in the ink formulation to improve the toughness of the ink film, but the added amount should be controlled well. Otherwise, sticking will occur.
In fact, the nitrocellulose system and the polyamide system of aluminum foil ink each have their own strengths and shortcomings. In the process of doing the ink, the components of the two systems will be properly matched to each other, taking care of each other, and the performance will be balanced, so that the printing of the ink can be facilitated.
Second, the vividness of aluminum foil ink To improve the vividness of the color of aluminum foil ink prints, it is necessary to print the ink first and then a layer of varnish, but this will increase the printing cost, unless there is a special requirement for the printer to do so. do. Another method is to print color ink on the glossy side of the aluminum foil. This requires the surface treatment of the aluminum foil to be high and requires the ink to have good adhesion on the aluminum foil. What is more, a transparent type ink using a dye powder as a coloring material has excellent vividness and transparency.
Third, the aluminum foil ink slitting pure aluminum foil is more brittle, flexible strength is not enough, usually printed with a varnish or aluminum foil ink, this can improve the flexibility of aluminum foil, improve the cutting effect. Under normal circumstances, after the ink is printed, the ink may not be printed, and the cutting requirements may also be achieved. That is, by separately printing the varnish or ink, the cutting requirements may be achieved. The fact that the print surface is too hard or too soft is not conducive to slitting, and that the print surface is too slippery or blunt is not conducive to slitting. Usually by adjusting the content of nitrocellulose inside aluminum foil ink to meet the requirements, the number of seconds of nitrocotton is proportional to the hardness. If a single nitrocellulose cannot meet the requirements, it can be matched with two types of nitrocellulose. The smoothness of the surface can be adjusted with wax powder to meet the requirements. Usually also add some leveling additives to improve the printing effect, prevent orange peel, smooth ink layer to facilitate cutting. One thing to note is that the leveling agent should not be added too much because some leveling aids have a counteracting effect of extinction, which can affect the brightness and adhesion of aluminum foil ink prints.
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