How to apply the hottest water-based ink on corrug

How to apply water-based ink to 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 a kind of flexible letterpress water-based ink printing, which consists of lead printing (relief printing), offset printing (lithography), rubber plate water washable printing. Flexible letterpress water-based inks have also developed from rosin maleic acid modified resin to acrylic resin series (high-end) to better support the work of the experimental machine for customers. Printing plates are also transitioning from rubber plates to resin plates. Printing machines have also gradually developed from monochrome or two-color machines with large rollers to three-color or four-color flexo machines. The eyelet has also gradually developed from 150-200 mesh metal rollers to 180-250 mesh ceramic rollers. With the rapid development of printing technology, the use of water-based ink is very important. Before discussing 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

I. characteristics of water-based ink for corrugated paper printing

1 Water based inks can be roughly divided into two categories:

(a) rosin maleic acid modified resin series (low-grade)

(b) acrylic resin series (high grade)

2. Comparison of the characteristics of two kinds of water-based inks: (omitted)

Second, requirements for the performance of 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. The 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

III. technical parameters of water-based ink

1 Color: similar to the standard sample version

note: use the manual color developing wheel to develop and compare the color of the test sample and the standard sample, which are similar but not connected

2. Fineness: less than 20 μ m instrument: 0-50 μ m scraper fineness meter

3. Viscosity: 20 seconds 5 seconds 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

IV. requirements for the correct use of water-based ink:

1 Before use, the operation number should be fully stirred to keep the ink composition uniform

2. After opening and using, the ink storage should be covered and sealed immediately to prevent dust from falling and crusting

3. Torsion tester Bao, now 57, had problems when he took up the post of new Dow 1 in March last year? 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 can 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