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 made of lead-type (relief printing), offset printing (offset printing), and rubber-plate water-washable printing. It has been developed to date as a flexible letterpress water-based ink printing. Flexographic water-based ink has also developed from rosin-maleic acid modified resin 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 large roller single-color or two-color machines to three-color or four-color FLEXO machines. The mesh wheel has also gradually developed from 150-200 mesh metal rollers to 180-250 mesh ceramic rollers. With the rapid development of printing technology, the skill of using water-based ink is 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 operator factors Wait.
1. Characteristics of water-based ink for corrugated paper printing
1. Water-based inks are roughly divided into two categories:
(A) Rosin-maleic acid modified resin series (low grade);
(B) Acrylic resin series (high-end).
2. Comparison of the characteristics of two types of water-based inks: (omitted)
Second, the performance requirements of water-based ink:
1. After long-term storage of the precipitate, it should be easily dispersed again after stirring;
2. To have good flow properties and viscosity;
3. Has good storage stability;
4. Drying performance should be fast and appropriate;
5. Can not have any adverse effects on printing plates and printing machines;
6. There should not be too much irritating smell;
3. Technical parameters of water-based ink
1. Color: similar to the standard sample Note: Compare the test sample and the standard sample with a manual color wheel to develop the color contrast.
2. Fineness: less than 20 micrometers: 0-50 micrometer scraper fineness meter.
3. Viscosity: 20 seconds ± 5 seconds Instrument: RIGOSHA4 # cup (25 ° C).
4. PH value: 8.0-9.5 Instrument: portable PH meter (PHB-2 type).
5. Heavy metal content: in line with world packaging green environmental protection standards.
6. Various resistance: meet the requirements.
Fourth, the correct use of water-based ink requirements:
1. Must be fully stirred before use to keep the ink composition uniform;
2. The ink storage should be capped and sealed immediately after opening and use, to prevent dust from falling and dry skin;
3. If the residual ink contains impurities, it should be filtered first, and then used with new ink;
4. During storage, please avoid exposure to high temperature or hot sun. Under normal conditions, it can be stored for one year without deterioration;
5. If it is found that the viscosity of the applied ink is slightly larger, an appropriate amount of water can be added for adjustment.
Eyeshadow Makeup,Smokey Eyeshadow,Colorful Eyeshadow,Colorful Eyeshadow Palette
Zhejiang Laizhen Biotechnology Co., Ltd. , https://www.laizhen-bio.com