Waterless Offset Printing Ink: Mature in Environmental Protection (I)

Development status of anhydrous glue ink

Compared with the first and second generations, the third generation of waterless offset printing has used low viscosity waterless offset printing inks. In addition, the printed matter is no longer a thick ink film printing, but the same thin ink film printing as ordinary offset printing, and other printing workability and stackability are also basically the same as ordinary offset printing. The improvements in sheet-fed and web-fed presses to improve printing speed and automation are endless, but the impact of printing speed on printability far exceeds the expectations of printer designers, especially for ink transferability. Has a significant impact.

1. Sheet-fed offset printing ink "Dry-O-Color Artis"

In the past five years, "Dry-O-Color Artis" has improved the ink transferability, ink receptivity, fixation, and post processing suitability, and has been adapted to high-speed, on the basis of maintaining product gloss and anti-scuffing properties. Requirements for multicolor sheetfed waterless offset presses.

(1) Design ideas. After achieving the low viscosity and low viscosity required for high-speed printing, special additives must be used to further control the anti-dirt properties. To maintain the viscosity and viscosity, only the fluidity of the ink can be further improved to improve the ink's performance. Transferability. The specific approach is:

1 To improve the dispersibility of the pigment, use a high-soluble resin binder.

2 In order to maintain the resistance to scumming, new non-aromatic hydrocarbon solvents that allow rapid diffusion of the printing plate oleophilic resin and the non-image part of the silicon layer were developed.

(2) Ink characteristics. Under the condition that the viscosity and viscosity of the ink are almost the same as those of the original product, the fluidity of the ink is improved by about 15%, and the ink transferability is improved by about 10%.

(3) Market evaluation. Gloss is good, fast fixing; close to the quality of water offset printing; has the same printability as ordinary offset printing ink; ink hiding power is also improved. A few users have suggested that the overprintability of ink is about 5% lower; the color reproducibility is not exactly the same as with water printing; the density in the field is slightly worse than the offset with water.

2. High-speed web offset press thermosetting type waterless offset printing ink

Compared with sheetfed printing, Web offset printing has increased the printing speed by about 2 times. It requires higher ink flowability and lower viscosity requirements. Using the same resin design as Dry-O-Color Artis, it is also suitable for rotary waterless offset printing inks, that is, under the premise of not reducing the cT (index of occurrence of pasting), using a link material that improves the ink flowability to make the ink at high speed Get good transferability when printing.