1. Require ink to have good printability
Due to the increasing requirements of manufacturers for the advertising effect of cartons, the carton design is becoming more and more beautiful, so a large number of mesh tone, color registration, and large-scale printing are used. Some patterns have been refined to a 5% shallow mesh transition, and the solid layout requires full and bright colors and even ink colors. At present, oil-based gravure ink is widely used in the Chinese market, and the performance of water-based gravure ink in printing suitability is not good enough, and it is difficult to meet the requirements of carton customers.
2. Require ink to meet environmental protection requirements
Although China still uses a lot of oil-based gravure inks with low environmental protection coefficients in carton preprinting, alcohol-soluble and benzene-free inks that meet environmental protection requirements have gradually become mainstream, and major printing houses and ink production plants are also promoting water-based inks. Useful exploration. In addition to the environmental protection requirements for solvents, strict requirements are also placed on the content of heavy metals, toxic substances and carcinogens in inks. For example, the heavy metal content of ink dry films is limited. 96a.
3. The ink is required to have heat resistance and friction resistance
The corrugated cardboard production line has a compact drying tunnel length of 2O ～ 100m and a drying temperature of 17O ～ 200 ° C. The printing surface is towed for 20 to 100 m under high pressure and high temperature for about 10 seconds. 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 and wear-resistant, it will become soft, sticky, or the color of the ink and the flower will cause waste. produce.
4. Require ink layer to have proper surface friction coefficient
The inspection method of the carton manufacturer is: put the carton filled with products horizontally on a movable board first, and then increase the end of the board at a certain linear speed. When the angle of the fixed end 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 slide. In the range greater than 24 ° and less than 30 °, it can slide or stand still. If only the ink layer is required to be wear-resistant, it is not difficult to add a lot of wear-resistant additives to the ink to achieve this goal, but the surface of the carton must have a suitable coefficient of friction, which is quite large for the ink manufacturing industry. Difficulty. Various equipment, inks and varnishes required for pre-printing of carton gravure have been domestically produced. Demei Ink Chemical Co., Ltd. looks forward to cooperating with more carton manufacturers to make the market of carton pre-printing bigger and stronger, and achieve a win-win situation for everyone.
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