Water-based ink waste reuse tips during book printing
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Water-based inks have been used in the printing of corrugated paper for a long time abroad, and have been used in China for more than 20 years. Corrugated printing is developed by printing (printing), offset printing (printing), and rubber-printed water, and it has become the flexible letterpress water-based ink printing today. Flexible relief water-based inks have also evolved from the rosin-maleic acid modified tree finger series (low grade) to the acrylic resin series (high grade). The printing plate also transitioned from the rubber plate to the resin plate. The printing press has also evolved from a monochrome or two-color machine with a large stick to a three- or four-color ELEXO machine. The mesh wheel is also gradually developed from a 150-200 mesh metal roll to a 180-250 mesh ceramic roll. With the ever-changing printing technology and the use of water-based inks, it is very important. Before discussing the use of water-based inks, we must first understand the characteristics of water-based inks and the relationship and influence of various factors in printing, such as plate factors, paper factors, mesh wheel factors, mechanical factors, ink factors, operators. Factors, etc.
1. Characteristics of water-based ink for corrugated printing Water-based inks can be divided into two categories: 1 rosin-maleic acid modified resin series (low grade); 2 acrylic resin series (high grade).
2. Requirements for water-based inks 1 After long-term storage of precipitates, it should be easily redispersed after being stirred; 2 should have good flow properties and viscosity; 3 have good storage stability; 4 dry performance should be fast and appropriate; Have any adverse effects on the plate and machine; 6 can not have too much pungent odor.
3. Water-based ink technical parameters 1 color: similar to the standard version (Note: the sample and the standard sample are not connected to each other with the manual color wheel color contrast); 2 fineness: less than 20um, instrument: 0 ~ 50um scraper Fineness meter; 3 Viscosity: 20±5s, instrument: RIGOSHA4# cup (25°C); 4PH value: 8.0～9.5 Instrument: Portable pH meter (PHB-2 type); 5 heavy metal content: in line with the world packaging green environmental standards; 6 tolerance: meet the requirements.
4. The correct use of water-based inks requires sufficient agitation before use to keep the ink composition uniform; 2 After the use of the ink, the ink should be sealed and sealed, so that the dust is dusty and the skin is dry; 3 inks contain impurities. It should be filtered first and then used with new ink. 4 Please avoid near high temperature or hot sun during storage. Store under normal conditions for one year without deterioration. 5 If the viscosity of applied ink is slightly larger, Add appropriate amount of water for adjustment.