1. Requires ink to have good printability
Due to the increasing demand of the manufacturers for the advertising role of the carton, the design of the carton pattern is getting more and more exquisite, so a large number of screens, color printing, and large-scale printing are adopted. Some patterns have been refined to a shallow web transition of 5%, while solid layouts require full color and uniform ink. At present, oily gravure inks are widely used in the Chinese market, and the performance of water-based gravure inks in terms of printability is not good enough, and it is still difficult to meet the requirements of carton customers.
2. Require ink to meet environmental protection requirements
Although China still uses a lot of oily gravure printing inks with lower environmental factors in carton pre-printing, alcohol-soluble and benzene-free inks that meet environmental requirements have gradually become the mainstream. Major printing companies and ink production plants also promote water-based inks. A useful exploration. In addition to solvent environmental protection requirements, there are stringent requirements for heavy metals in inks, toxic substances, and carcinogens. For example, restrictions on the heavy metal content of ink dry film, the internationally accepted standards are the EU's EN-71 and the US's ASTM-F963- 96a.
3. Requirements of ink with heat and friction resistance
Corrugated board production line compaction drying channel length 2O ~ 100m, drying temperature of 17O ~ 200 °C. The printing surface is dragged to 20-1OOm for about 10 seconds under high pressure and high temperature conditions. This requires that the ink and varnish must have excellent heat resistance and abrasion resistance. If the resin selected for the ink and varnish is not heat-resistant, wear-resistant, softening occurs, stickiness or discoloration of the ink and hair growth can lead to waste products. produce.
4. Requirements ink layer has a suitable surface friction coefficient
The inspection method used by the carton manufacturer is to place the filled cartons horizontally on a movable plate surface, and then increase the plate ends at a certain linear velocity. When the angle of the fixed ends is less than or equal to 24°, the carton Can't slide. When the angle of the fixed end is greater than or equal to 30°, the carton must be slid, and it can slide or be stationary in a range of more than 24° and less than 3O°. If only the ink layer is required to be hard-wearing, it is not difficult to add a lot of wear-resistant additives to the ink, but it is required that the surface of the carton have a suitable friction coefficient. This is quite large for the ink manufacturing industry. The difficulty. Cartons gravure preprint required for a variety of equipment, inks, Varnish have been made. Demax Ink Chemical Co., Ltd. looks forward to cooperating with more carton manufacturers to enlarge and strengthen the market for carton preprints to achieve a win-win situation for everyone.