Water-based ink on corrugated paper

Water-based inks are used in corrugated printing and have had a long period of development abroad. Corrugated paper is printed by a lead-printed, flat-printed, flexo-printable, and flexographic water-based ink. Flexo-based water-based inks have also evolved from rosin-maleic acid-modified resin series <low quality printing> to acrylic resin series <high-quality printing>, and the printing plate material has also transitioned from a rubber plate to a resin plate. The press has gradually changed from a large wheel monochromatic or two-color machine to a three- or four-color FLEXO machine. The mesh wheel is also gradually transformed from a 150-200 mesh metal wheel to a 180-250 mesh ceramic roller. As the printing technology changes day by month, the use of water-based inks becomes very important. Before discussing the usage techniques of water-based inks, we must first understand the characteristics of water-based inks and the relationships and impacts of various factors in printing, such as plate material factors, paper factors, web factors, ink and ink factors, and operator factors.

Water-based ink on corrugated paper

Water-based inks are roughly classified into rosin-maleic acid modified resin series and acrylic resin series.

Flexographic treatment methods and requirements

Approach

※ When transporting and storing unexposed flexo materials, it should be placed in a flat place at all times.

※ It is not allowed to stack more than 14 boxes (with the same size and count) each time when it is overlaid on the flexographic plate. It is recommended that each 7-box layout should be separated by placing the same size of wood.

※ In case of different size packing, the large size should be placed at the lowest position and the layout should be separated by a board with the same size. Only a smaller size can be added to the layout.

※ Keep the temperature of the media at 150C ~ 200C, and the corresponding humidity is 55%, to prevent direct sunlight or ultraviolet rays.

※ Be careful not to place other materials and contaminants on the flexographic surface, let alone sit on the surface of the box.

Claim

※ Clear prints can be deep.
※ The stable foundation should not be too thick or too thin.
※ Good resilience ※ Moderate hardness ※ Less dot gain

Requirements for ink performance

※ After storage of mats for a long time, it is easy to redisperse by stirring. ※ Good fluidity and viscosity. ※ Good storage stability. ※ Fast drying and proper ※ No impact on printing and printing machine. ※ No strong irritating odor.

Water-based ink specifications

※ Viscosity <20 seconds plus or minus 5 seconds> Instrument: Japan RIGOSHA CUP4.
Note: The special tone ink depends on the actual needs, compared with the standard version does not exceed plus or minus 2 seconds ※ fineness < 20 micron scraper fineness: <0 – 50 micron
※ PH value: 8 - 9.5< optimal 8.5 – 9.2>DIGITAL PH/MU METER SUNTEX TS-1
※ Color: Approximate to the standard model.
Note: The standard samples of the sample are similarly and uncontiguously compared in the development of the 120-mesh colorimeter.
※ Environmental protection: in line with the world packaging environmental standards.

The correct use of water-based ink

※ Before use, it should be fully stirred to keep the ink components uniform. ※ After opening, the ink should be stamped and sealed immediately. Drying with dust-proofed Egyptian crusts ※ The impurities contained in the ink should be filtered and used together with the new ink. ※ Avoid exposure to high temperatures or intense sunlight during storage. Can be stored for one year without deterioration. ※ If you find ink applied When the viscosity is slightly larger, appropriate amount of fresh water can be adjusted

In summary, one of the important factors for ink printing is the use of ink. With the ever-changing printing technology and the upgrading of printing equipment, water-based inks will tend to have high concentration, low viscosity, and low volatility. The strong direction of development, the strong sense of the four-color overprint is also just around the corner.