In the printing process, cigarette packs are coated with a layer of varnish in order to enhance the appearance of printed products, improve the use of printed products, and improve the protection of printed products.
The gravure gravure coating of the cigarette pack has the characteristics of high transparency, odorlessness, strong gloss, rapid drying, good chemical resistance, good light resistance, film with certain elasticity and flexibility, strong adhesion to ink, and good leveling property. , Film surface is smooth, Wide adaptability of post-printing processing (can be hot stamping), but also has excellent wear resistance to meet in the printing is not easy to be scratched, in the process of handling and storage is not easy to be wiped and in the cigarette packer It is not easy to be scratched. In order to satisfy these properties, besides the selection of the main resin should be very detailed, but also in the choice of additives should also be very careful.
In gravure wear resistance of gravure coating, wax powder and silicone are currently used as wear-resistant additives in most cases. Due to the high cost of good silicone, and the subsequent gilding adaptation is not very good, therefore, currently Most use wax powder as a wear resistance additive.
There are many types of wax powder used in gravure printing oil, such as polyethylene wax, polyacrylic wax, amide wax, polytetrafluoroethylene wax, mixed wax, etc., which are generally dispersed by high speed dispersion with a resin liquid when used. Add it to varnish afterwards.
Wax powder not only plays the role of anti-wear agent in the gravure oil. At present, the gravure oil used in gravure printing generally adopts the high-acid marlin acid resin which increases the gloss and increases the adhesion. Therefore, the gravure oil The dryness is not very good, and it often causes the gravure oil to turn the bottom ink down to form white spots. Even the printed semi-finished cigarette labels will be stacked during the stacking process. At this time, the gravure gravure coating is applied to meet the gravure coating (without affecting the transparency, gloss, adhesion to the ink, leveling and printing adaptability, and printing Under the basic requirements of post-bronze adaptability, the amount of wax powder can be properly increased, which can solve ink transfer and take-up problems. Generally, the addition of wax powder will reduce the surface friction between the print product and the paper feed roller, so that when the print product is separated from the paper feed roller, the peeling tension is reduced, resulting in a corresponding decrease in the peel tension of the bottom ink. Because of the precipitation of wax on the surface during stacking, the risk of overtaxing is also reduced.
Source: cigarette packets ink information network
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