Water-based inks have been used in the printing of corrugated paper for quite a long time abroad, and for more than 20 years in China. Corrugated paper printing is developed from lead-printing (relief printing), offset printing (offset printing), and offset water-washable printing to today's flexible letterpress water-based ink printing. Flexographic water-based ink has also developed from rosin-maleic acid modified tree finger series (low grade) to acrylic resin series (high grade). The printing plate material also transitions from the rubber plate to the resin plate. Printing machines have also gradually evolved from single-color or two-color machines with big sticks to three-color or four-color ELEXO machines. The mesh wheel has also been gradually developed from 150 to 200 mesh metal rollers to 180 to 250 mesh ceramic rollers. With the rapid development of printing technology, the skill of using water-based ink becomes very important. Before discussing the use of water-based inks, we must first understand the characteristics and relationship between water-based inks and various factors in printing, such as plate factors, paper factors, mesh wheel factors, mechanical factors, ink factors, and operators Factors, etc.
1. Characteristics of water-based ink for corrugated paper printing
The water-based ink is divided into two categories: â‘ rosin-maleic acid modified resin series (low grade); â‘¡ acrylic resin series (high grade).
2. Requirements for water-based ink
â‘ After long-term storage and sedimentation, it should be easily redispersed after stirring; â‘¡It must have good fluidity and viscosity; â‘¢Good storage stability; â‘£Drying performance should be fast and appropriate; Any adverse effects; â‘¥ Can not have too much irritating odor.
3. Technical parameters of water-based ink
①Color: similar to the standard version (Note: Compare the test sample and the standard sample with a manual color wheel to develop the color comparison); ②Fineness: less than 20um, instrument: 0-50um scraper fineness meter; ③Viscosity ： 20 ± 5s, instrument: RIGOSHA4 # cup (25 ℃); ④PH value: 8.0 ～ 9.5 instrument: portable PH meter (PHB-2 type); ⑤heavy metal content: in line with world packaging green environmental protection standards; ⑥ various resistance: in line with Claim.
4. Requirements for the correct use of water-based inks
①Must be fully stirred before use to keep the ink composition uniform; ②The ink should be capped and sealed immediately after use and opened to prevent dust and dry skin; ③If the residual ink contains impurities, it should be filtered first and then mixed with new ink Use together; ④ Please avoid exposure to high temperature or hot sun during storage. Store under normal conditions for one year without deterioration; ⑤ If you find that the viscosity of the applied ink is slightly larger, you can add an appropriate amount of water for adjustment.
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