The most popular technique for printing corrugated

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Skills of using water-based ink to print corrugated paper

the application of water-based ink to corrugated paper printing has been a long time abroad and more than 20 years in China. Corrugated paper printing is developed into today's flexible letterpress water-based ink printing by means of lead printing (embossing parts, etc.), offset printing (lithography) and rubber plate water washable printing. Flexible letterpress 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 also transits from rubber plate to resin plate. The printing press has also gradually developed from the large stick cylinder monochrome or two-color machine to the three-color or four-color elexo machine. The eyelet has gradually developed from 150 ~ 200 mesh metal roller to 180 ~ 250 mesh ceramic roller. With the rapid development of printing technology, water-based oil 2 It is very important to use the software package of multi-channel data collection and fault diagnosis system. Before the author discusses the use skills of water-based ink, we must first understand the characteristics of water-based ink and the relationship and influence of various factors in printing, such as plate factors, paper factors, eye wheel factors, mechanical factors, ink factors, operator factors, etc

1. Characteristics of water-based ink for corrugated paper printing

water-based ink 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 and sedimentation, it should be easy to redistribute after mixing; ② Have good flow performance and viscosity; ③ Good storage stability; ④ Drying performance should be fast and appropriate; ⑤ It shall not have any adverse effect on the printing plate and printing machine; ⑥ Do not have too much pungent smell

3. Technical parameters of water-based ink

① color: similar to the Standard Version (Note: use the manual color wheel to compare the color of the test sample and the standard sample when they are similar and disconnected); ② Fineness: less than 20um, instrument: 0 ~ 50um scraper fineness this is a stool meter that will react to ultraviolet rays and produce color changes; ③ Viscosity: 20 5S, instrument: rigosha4\cup (25 ℃); ④ PH value: 8.0 ~ 9.5 instrument: Portable pH meter (PHB 2 type); ⑤ Heavy metal content: in line with the world green packaging standards; ⑥ Various endurance: meet the requirements

4. Requirements for correct use of water-based inks

① before use, it is necessary to fully stir to keep the ink composition uniform; ② After opening and using, the ink storage shall be sealed immediately to prevent dust falling and crusting; ③ If the remaining ink contains impurities, it should be filtered first, and then used together with new ink; ④ Please avoid exposure to high temperature or hot sun during storage. Under normal conditions, it will be stored for one year without deterioration; ⑤ If it is found that the viscosity of the applied ink is slightly higher, an appropriate amount of water can be added for adjustment

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